5.0.0 Release

Informative commit message I know

.editorconfig

@@ -0,0 +1,16 @@
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+insert_final_newline = false
+tab_width = 4
+
+[*.java]
+ij_java_class_count_to_use_import_on_demand = 999999
+ij_java_names_count_to_use_import_on_demand = 999999
+ij_java_imports_layout = *, |, $*
+ij_java_generate_final_locals = true
+ij_java_generate_final_parameters = true
+
+[{*.json,*.yml}]
+indent_size = 2

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: kennytv
+patreon: kennytv

.github/ISSUE_TEMPLATE.md

@@ -1,17 +0,0 @@
-##### What version of ViaBackwards are you using? Type /ver ViaBackwards:
-
-
-##### What version of ViaVersion are you using? Type /ver ViaVersion:
-
-
-##### What version of Spigot are you using? Type /ver:
-
-
-##### What plugins are you using? Type /plugins:
-
-
-##### How/when does this error happen? login?:
-
-
-##### Is there an error in the console? Use pastebin.com. Is there a kick message?:
-

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,96 @@
+name: Bug Report
+description: Report a bug or console error
+labels: [unconfirmed]
+
+body:
+  - type: markdown
+    attributes:
+      value: "**Before reporting a bug, please see if using master/dev builds from https://ci.viaversion.com/ fixes your issue.**"
+
+  - type: input
+    attributes:
+      label: "'/viaversion dump' Output"
+      description: |
+        Run `/viaversion dump` in the console or in the chat, then copy and paste the given link here.
+      placeholder: |
+        https://dump.viaversion.com/...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Console Error
+      description: |
+        If you encounter warnings/errors in your console, **paste them with https://mclo.gs/ and put the paste link here**.
+        If the error is small/less than 10 lines, you may put it directly into this field.
+      value: |
+        ```
+        Put the mclo.gs link or text here.
+        ```
+      placeholder: Please do not remove the grave accents; simply replace the line of text in the middle.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Bug Description
+      description: |
+        Describe the unexpected behavior.
+        If you want to attach screenshots, use the comment field at the bottom of the page.
+      placeholder: |
+        Example: "Placing signs on 1.13.2 causes text to disappear."
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Steps to Reproduce
+      description: |
+        List the steps on how we can reproduce the issue. Make sure we can easily understand what you mean with each step.
+      placeholder: |
+        Example:
+        1. Login with a 1.13.2 client
+        2. Place a sign
+        3. The sign text is displayed wrong
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Expected Behavior
+      description: |
+        Describe what exactly you expected to happen.
+      placeholder: |
+        Example: "Placed sign text should not disappear."
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional Server Info
+      description: |
+        Do you use a proxy (eg. Velocity)? What software do you use and what plugins?
+      placeholder: |
+        Example: "I also use Velocity with the following plugins: x, y, z"
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: Make sure you have followed each of the steps outlined here.
+      options:
+        - label: Via plugins are only running on **EITHER** the backend servers (e.g. Paper) **OR** the proxy (e.g. Velocity), **not on both**.
+          required: true
+        - label: I have included a ViaVersion dump.
+          required: true
+        - label: If applicable, I have included a paste (**not a screenshot**) of the error.
+          required: true
+        - label: I have tried a build from https://ci.viaversion.com/ and the issue still persists.
+          required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        ## Comments And Screenshots
+        If needed, add **screenshots to help explain your problem** in the comment field below.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Dev builds
+    url: https://ci.viaversion.com/
+    about: Before reporting a bug, please check if using master/dev builds from our ci fixes your issue.
+  - name: ViaVersion Discord
+    url: https://discord.gg/viaversion
+    about: For smaller issues or questions, you can also join our Discord server.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,38 @@
+name: Feature Request
+description: Suggest a feature to be added
+labels: [Feature Request]
+
+body:
+  - type: textarea
+    attributes:
+      label: Problem Description
+      description: |
+        Describe the issue you are facing or why you need the feature to be added.
+      placeholder: |
+        I am always frustrated with...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Solution Description
+      description: |
+        Describe the solution you would like to see.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Alternatives
+      description: |
+        Describe alternatives you have considered.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Additional Info
+      description: |
+        Does the feature apply to any specific version or environment?
+    validations:
+      required: false

.github/workflows/gradle.yml

@@ -0,0 +1,23 @@
+name: Java CI with Gradle
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+    - name: Validate Gradle Wrapper
+      uses: gradle/wrapper-validation-action@v2
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 17
+        check-latest: true
+    - name: Build with Gradle
+      run: ./gradlew build

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish to Hangar and Modrinth
+on:
+  push:
+    branches:
+      - master
+      - dev
+
+jobs:
+  publish:
+    if: github.repository_owner == 'ViaVersion'
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v2
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          check-latest: true
+      - name: Publish
+        env:
+          HANGAR_TOKEN: ${{ secrets.HANGAR_TOKEN }}
+          MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
+        run: ./gradlew build modrinth publishAllPublicationsToHangar --stacktrace

.gitignore

@@ -1,105 +1,35 @@
-# Created by .ignore support plugin (hsz.mobi)
-### Maven template
-target/
-pom.xml.tag
-pom.xml.releaseBackup
-pom.xml.versionsBackup
-pom.xml.next
-release.properties
-dependency-reduced-pom.xml
-buildNumber.properties
-.mvn/timing.properties
-### NetBeans template
-nbproject/private/
-build/
-nbbuild/
-dist/
-nbdist/
-nbactions.xml
-.nb-gradle/
-### Eclipse template
+### Java files ###
+*.class
 
-.metadata
-bin/
-tmp/
-*.tmp
-*.bak
-*.swp
-*~.nib
-local.properties
-.settings/
-.loadpath
-.recommenders
+# Package Files
+#*.jar
+*.war
+*.ear
 
-# Eclipse Core
-.project
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
 
-# External tool builders
-.externalToolBuilders/
 
-# Locally stored "Eclipse launch configurations"
-*.launch
 
-# PyDev specific (Python IDE for Eclipse)
-*.pydevproject
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm
+# Ignore project files
+*.iml
 
-# CDT-specific (C/C++ Development Tooling)
-.cproject
+# Ignore IDEA directory
+.idea/*
+!.idea/copyright/*
+!.idea/scopes/*
 
-# JDT-specific (Eclipse Java Development Tools)
-.classpath
+# Include the project's dictionary
+!.idea/dictionaries/
+!.idea/dictionaries/*
 
-# Java annotation processor (APT)
-.factorypath
-
-# PDT-specific (PHP Development Tools)
-.buildpath
-
-# sbteclipse plugin
-.target
-
-# Tern plugin
-.tern-project
-
-# TeXlipse plugin
-.texlipse
-
-# STS (Spring Tool Suite)
-.springBeans
-
-# Code Recommenders
-.recommenders/
-### JetBrains template
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
-# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
-
-# User-specific stuff:
-.idea/workspace.xml
-.idea/tasks.xml
-.idea/dictionaries
-.idea/vcs.xml
-.idea/jsLibraryMappings.xml
-
-# Sensitive or high-churn files:
-.idea/dataSources.ids
-.idea/dataSources.xml
-.idea/dataSources.local.xml
-.idea/sqlDataSources.xml
-.idea/dynamic.xml
-.idea/uiDesigner.xml
-
-# Gradle:
-.idea/gradle.xml
-.idea/libraries
-
-# Mongo Explorer plugin:
-.idea/mongoSettings.xml
-
-## File-based project format:
+# File-based project format:
+*.ipr
 *.iws
 
-## Plugin-specific files:
-
+### Plugin-specific files: ###
 # IntelliJ
 /out/
 
@@ -113,18 +43,67 @@ atlassian-ide-plugin.xml
 com_crashlytics_export_strings.xml
 crashlytics.properties
 crashlytics-build.properties
-fabric.properties
-### Java template
-*.class
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
 
-# Package Files #
-*.jar
-*.war
-*.ear
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+### Eclipse ###
+*.pydevproject
+.metadata
+.gradle
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
 
+# Eclipse Core
+.project
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# CDT-specific
+.cproject
+
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# PDT-specific
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# TeXlipse plugin
+.texlipse
+
+
+
+### Maven ###
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+
+
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+.nb-gradle/

.idea/copyright/profiles_settings.xml

@@ -0,0 +1,10 @@
+<component name="CopyrightManager">
+  <settings>
+    <module2copyright>
+      <element module="ViaBackwards" copyright="viabackwards-gpl" />
+    </module2copyright>
+    <LanguageOptions name="__TEMPLATE__">
+      <option name="addBlankAfter" value="false" />
+    </LanguageOptions>
+  </settings>
+</component>

.idea/copyright/viabackwards_gpl.xml

@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards&#10;Copyright (C) 2016-&amp;#36;today.year ViaVersion and contributors&#10;&#10;This program is free software: you can redistribute it and/or modify&#10;it under the terms of the GNU General Public License as published by&#10;the Free Software Foundation, either version 3 of the License, or&#10;(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,&#10;but WITHOUT ANY WARRANTY; without even the implied warranty of&#10;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the&#10;GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License&#10;along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="viabackwards-gpl" />
+  </copyright>
+</component>

.idea/scopes/ViaBackwards.xml

@@ -0,0 +1,3 @@
+<component name="DependencyValidationManager">
+  <scope name="ViaBackwards" pattern="com.viaversion.viabackwards..*" />
+</component>

LICENSE

@@ -1,7 +1,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -631,8 +631,8 @@ to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
-    {one line to give the program's name and a brief idea of what it does.}
-    Copyright (C) {year}  {name of author}
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -645,14 +645,14 @@ the "copyright" line and a pointer to where the full notice is found.
     GNU General Public License for more details.
 
     You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
   If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:
 
-    {project}  Copyright (C) {year}  {fullname}
+    <program>  Copyright (C) <year>  <name of author>
     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it
     under certain conditions; type `show c' for details.
@@ -664,11 +664,11 @@ might be different; for a GUI interface, you would use an "about box".
   You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
+<https://www.gnu.org/licenses/>.
 
   The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -1,13 +1,65 @@
 # ViaBackwards
 
-Allows 1.9.x on a 1.10 Spigot server.
-Requires [ViaVersion](http://viaversion.com) to be installed
+[![Latest Release](https://img.shields.io/github/v/release/ViaVersion/ViaBackwards)](https://github.com/ViaVersion/ViaBackwards/releases)
+[![Build Status](https://github.com/ViaVersion/ViaBackwards/actions/workflows/gradle.yml/badge.svg?branch=master)](https://github.com/ViaVersion/ViaBackwards/actions)
+[![Discord](https://img.shields.io/badge/chat-on%20discord-blue.svg)](https://viaversion.com/discord)
 
-TODO:
-- [ ] Cleanup code
-- [ ] Improve the rewriters
-- [ ] Make it possible to send metadata with the rewriteEntityId
-- [ ] Add support for sound names
-- [ ] Create JavaDocs
-- [ ] Improve the Entity tracker system to work good with multiple versions.
-- [ ] Make it possible to choose your own replacement blocks
+**Allows older Minecraft client versions to connect to newer server versions.**
+
+Requires [ViaVersion](https://hangar.papermc.io/ViaVersion/ViaVersion) to be installed..
+
+Supported Versions
+-
+As a plugin, ViaBackwards runs on servers on releases 1.10-latest. Versions from the dev branch will also support the
+latest snapshot. You can also use ViaBackwards in ViaFabric or ViaFabricPlus.
+
+See [HERE](https://github.com/ViaVersion) for an overview of the different Via* projects.
+
+Releases/Dev Builds
+-
+You can find releases in the following places:
+
+- **Hangar (for our plugins)**: https://hangar.papermc.io/ViaVersion/ViaBackwards
+- **Modrinth (for our mods)**: https://modrinth.com/mod/viabackwards
+- **GitHub**: https://github.com/ViaVersion/ViaBackwards/releases
+
+Dev builds for **all** of our projects are on our Jenkins server:
+
+- **Jenkins**: https://ci.viaversion.com/view/ViaBackwards/
+
+Known issues
+-
+
+* 1.17+ min_y and height world values that are not 0/256 **are not supported**. Clients older than
+  1.17 will not be able to see or interact with blocks below y=0 and above y=255
+* <1.17 clients on 1.17+ servers might experience inventory desyncs on certain inventory click actions
+* Sound mappings are incomplete ([see here](https://github.com/ViaVersion/ViaBackwards/issues/326))
+* <1.19.4 clients on 1.20+ servers won't be able to use the smithing table, this can be fixed by
+  installing [AxSmithing](https://github.com/ViaVersionAddons/AxSmithing)
+
+Other Links
+-
+**Maven:** https://repo.viaversion.com
+
+**List of contributors:** https://github.com/ViaVersion/ViaBackwards/graphs/contributors
+
+Building
+-
+After cloning this repository, build the project with Gradle by running `./gradlew build` and take the created jar out
+of the `build/libs` directory.
+
+You need JDK 17 or newer to build ViaBackwards.
+
+License
+-
+This project is licensed under the [GNU General Public License Version 3](LICENSE).
+
+Special Thanks
+-
+![https://www.yourkit.com/](https://www.yourkit.com/images/yklogo.png)
+
+[YourKit](https://www.yourkit.com/) supports open source projects with innovative and intelligent tools
+for monitoring and profiling Java and .NET applications.
+YourKit is the creator of [YourKit Java Profiler](https://www.yourkit.com/java/profiler/),
+[YourKit .NET Profiler](https://www.yourkit.com/.net/profiler/),
+and [YourKit YouMonitor](https://www.yourkit.com/youmonitor/).

build-logic/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    gradlePluginPortal()
+}
+
+dependencies {
+    // version must be manually kept in sync with the one in root project settings.gradle.kts
+    implementation("com.github.johnrengelman", "shadow", "8.1.1")
+}

build-logic/src/main/kotlin/extensions.kt

@@ -0,0 +1,45 @@
+import org.gradle.api.JavaVersion
+import org.gradle.api.Project
+import org.gradle.api.plugins.JavaPluginExtension
+import java.io.ByteArrayOutputStream
+
+fun Project.latestCommitHash(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "rev-parse", "--short", "HEAD")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.latestCommitMessage(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "log", "-1", "--pretty=%B")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.branchName(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "rev-parse", "--abbrev-ref", "HEAD")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.parseMinecraftSnapshotVersion(version: String): String? {
+    val separatorIndex = version.indexOf('-')
+    val lastSeparatorIndex = version.lastIndexOf('-')
+    if (separatorIndex == -1 || separatorIndex == lastSeparatorIndex) {
+        return null
+    }
+    return version.substring(separatorIndex + 1, lastSeparatorIndex)
+}
+
+fun JavaPluginExtension.javaTarget(version: Int) {
+    sourceCompatibility = JavaVersion.toVersion(version)
+    targetCompatibility = JavaVersion.toVersion(version)
+}

build-logic/src/main/kotlin/vb.base-conventions.gradle.kts

@@ -0,0 +1,25 @@
+plugins {
+    `java-library`
+}
+
+tasks {
+    // Variable replacements
+    processResources {
+        filesMatching(listOf("plugin.yml", "fabric.mod.json")) {
+            expand("version" to project.version, "description" to project.description, "url" to "https://viaversion.com/backwards")
+        }
+    }
+    javadoc {
+        options.encoding = Charsets.UTF_8.name()
+        (options as StandardJavadocDocletOptions).addStringOption("Xdoclint:none", "-quiet")
+    }
+    compileJava {
+        options.encoding = Charsets.UTF_8.name()
+        options.compilerArgs.addAll(listOf("-nowarn", "-Xlint:-unchecked", "-Xlint:-deprecation"))
+    }
+}
+
+java {
+    javaTarget(17)
+    withSourcesJar()
+}

build-logic/src/main/kotlin/vb.shadow-conventions.gradle.kts

@@ -0,0 +1,47 @@
+import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+import org.gradle.jvm.tasks.Jar
+import org.gradle.kotlin.dsl.named
+
+plugins {
+    id("vb.base-conventions")
+    id("maven-publish")
+    id("com.github.johnrengelman.shadow")
+}
+
+tasks {
+    named<Jar>("jar") {
+        archiveClassifier.set("unshaded")
+        from(project.rootProject.file("LICENSE"))
+    }
+    val shadowJar = named<ShadowJar>("shadowJar") {
+        archiveClassifier.set("")
+        configureRelocations()
+    }
+    named("build") {
+        dependsOn(shadowJar)
+    }
+}
+
+publishing {
+    publications.create<MavenPublication>("mavenJava") {
+        groupId = rootProject.group as String
+        artifactId = project.name
+        version = rootProject.version as String
+
+        artifact(tasks["shadowJar"])
+        artifact(tasks["sourcesJar"])
+    }
+    repositories.maven {
+        name = "Via"
+        url = uri("https://repo.viaversion.com/")
+        credentials(PasswordCredentials::class)
+        authentication {
+            create<BasicAuthentication>("basic")
+        }
+    }
+}
+
+fun ShadowJar.configureRelocations() {
+    relocate("com.google.gson", "com.viaversion.viaversion.libs.gson")
+    relocate("it.unimi.dsi.fastutil", "com.viaversion.viaversion.libs.fastutil")
+}

build.gradle.kts

@@ -0,0 +1,25 @@
+plugins {
+    base
+    id("vb.build-logic")
+}
+
+allprojects {
+    group = "com.viaversion"
+    version = property("projectVersion") as String // from gradle.properties
+    description = "Allows older Minecraft client versions to connect to newer server versions."
+}
+
+val main = setOf(
+    projects.viabackwards,
+    projects.viabackwardsCommon,
+    projects.viabackwardsBukkit,
+    projects.viabackwardsVelocity,
+    projects.viabackwardsFabric
+).map { it.dependencyProject }
+
+subprojects {
+    when (this) {
+        in main -> plugins.apply("vb.shadow-conventions")
+        else -> plugins.apply("vb.base-conventions")
+    }
+}

bukkit/build.gradle.kts

@@ -0,0 +1,7 @@
+dependencies {
+    compileOnlyApi(projects.viabackwardsCommon)
+    compileOnly(libs.paper) {
+        exclude("com.google.code.gson", "gson")
+        exclude("javax.persistence", "persistence-api")
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/BukkitPlugin.java

@@ -0,0 +1,79 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards;
+
+import com.viaversion.viabackwards.api.ViaBackwardsPlatform;
+import com.viaversion.viabackwards.listener.BlockBreakListener;
+import com.viaversion.viabackwards.listener.FireDamageListener;
+import com.viaversion.viabackwards.listener.FireExtinguishListener;
+import com.viaversion.viabackwards.listener.LecternInteractListener;
+import com.viaversion.viabackwards.listener.PlayerItemDropListener;
+import com.viaversion.viabackwards.protocol.v1_20_2to1_20.provider.AdvancementCriteriaProvider;
+import com.viaversion.viabackwards.provider.BukkitAdvancementCriteriaProvider;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.platform.providers.ViaProviders;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import java.io.File;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class BukkitPlugin extends JavaPlugin implements ViaBackwardsPlatform {
+
+    public BukkitPlugin() {
+        Via.getManager().addEnableListener(() -> init(new File(getDataFolder(), "config.yml")));
+    }
+
+    @Override
+    public void onEnable() {
+        if (Via.getManager().getInjector().lateProtocolVersionSetting()) {
+            // Enable in the next tick
+            Via.getPlatform().runSync(this::enable, 1);
+        } else {
+            enable();
+        }
+    }
+
+    private void enable() {
+        final ProtocolVersion protocolVersion = Via.getAPI().getServerVersion().highestSupportedProtocolVersion();
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_17)) {
+            new PlayerItemDropListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_16)) {
+            new FireExtinguishListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_14)) {
+            new LecternInteractListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_12)) {
+            new FireDamageListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_11)) {
+            new BlockBreakListener(this).register();
+        }
+
+        final ViaProviders providers = Via.getManager().getProviders();
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_20_2)) {
+            providers.use(AdvancementCriteriaProvider.class, new BukkitAdvancementCriteriaProvider());
+        }
+    }
+
+    @Override
+    public void disable() {
+        getPluginLoader().disablePlugin(this);
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/BlockBreakListener.java

@@ -0,0 +1,54 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.Protocol1_11To1_10;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.GameMode;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.block.BlockBreakEvent;
+import org.bukkit.inventory.ItemStack;
+
+public class BlockBreakListener extends ViaBukkitListener {
+
+    public BlockBreakListener(final BukkitPlugin plugin) {
+        super(plugin, Protocol1_11To1_10.class);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onBlockBreak(final BlockBreakEvent event) {
+        if (!event.isCancelled()) {
+            return;
+        }
+
+        final Player player = event.getPlayer();
+        if (player.getGameMode() == GameMode.CREATIVE || !isOnPipe(player)) {
+            return;
+        }
+
+        // Resend the item in the hand to sync durability
+        final int slot = player.getInventory().getHeldItemSlot();
+        final ItemStack item = player.getInventory().getItem(slot);
+        if (item != null && item.getType().getMaxDurability() > 0) {
+            player.getInventory().setItem(slot, item);
+        }
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/FireDamageListener.java

@@ -0,0 +1,54 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.Sound;
+import org.bukkit.SoundCategory;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.entity.EntityDamageEvent;
+
+public class FireDamageListener extends ViaBukkitListener {
+
+    public FireDamageListener(BukkitPlugin plugin) {
+        super(plugin, Protocol1_12To1_11_1.class);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onFireDamage(EntityDamageEvent event) {
+        if (event.getEntityType() != EntityType.PLAYER) return;
+
+        EntityDamageEvent.DamageCause cause = event.getCause();
+        if (cause != EntityDamageEvent.DamageCause.FIRE
+            && cause != EntityDamageEvent.DamageCause.FIRE_TICK
+            && cause != EntityDamageEvent.DamageCause.LAVA
+            && cause != EntityDamageEvent.DamageCause.DROWNING) {
+            return;
+        }
+
+        Player player = (Player) event.getEntity();
+        if (isOnPipe(player)) {
+            player.playSound(player.getLocation(), Sound.ENTITY_PLAYER_HURT, SoundCategory.PLAYERS, 1, 1);
+        }
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/FireExtinguishListener.java

@@ -0,0 +1,53 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.v1_16to1_15_2.Protocol1_16To1_15_2;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.player.PlayerInteractEvent;
+
+public class FireExtinguishListener extends ViaBukkitListener {
+
+    public FireExtinguishListener(BukkitPlugin plugin) {
+        super(plugin, Protocol1_16To1_15_2.class);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onFireExtinguish(PlayerInteractEvent event) {
+        if (event.getAction() != Action.LEFT_CLICK_BLOCK) return;
+
+        Block block = event.getClickedBlock();
+        if (block == null) return;
+
+        Player player = event.getPlayer();
+        if (!isOnPipe(player)) return;
+
+        Block relative = block.getRelative(event.getBlockFace());
+        if (relative.getType() == Material.FIRE) {
+            event.setCancelled(true);
+            relative.setType(Material.AIR);
+        }
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/LecternInteractListener.java

@@ -0,0 +1,65 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.v1_14to1_13_2.Protocol1_14To1_13_2;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.Lectern;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+
+public class LecternInteractListener extends ViaBukkitListener {
+
+    public LecternInteractListener(BukkitPlugin plugin) {
+        super(plugin, Protocol1_14To1_13_2.class);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onLecternInteract(PlayerInteractEvent event) {
+        Block block = event.getClickedBlock();
+        if (block == null || block.getType() != Material.LECTERN) return;
+
+        Player player = event.getPlayer();
+        if (!isOnPipe(player)) return;
+
+        Lectern lectern = (Lectern) block.getState();
+        ItemStack book = lectern.getInventory().getItem(0);
+        if (book == null) return;
+
+        BookMeta meta = (BookMeta) book.getItemMeta();
+
+        // Open a book with the text of the lectern's writable book
+        ItemStack newBook = new ItemStack(Material.WRITTEN_BOOK);
+        BookMeta newBookMeta = (BookMeta) newBook.getItemMeta();
+        //noinspection deprecation
+        newBookMeta.setPages(meta.getPages());
+        newBookMeta.setAuthor("an upsidedown person");
+        newBookMeta.setTitle("buk");
+        newBook.setItemMeta(newBookMeta);
+        player.openBook(newBook);
+
+        event.setCancelled(true);
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/PlayerItemDropListener.java

@@ -0,0 +1,48 @@
+
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+
+public class PlayerItemDropListener extends ViaBukkitListener {
+
+    public PlayerItemDropListener(final BukkitPlugin plugin) {
+        super(plugin, Protocol1_13_1To1_13.class); // Starts with 1.13 clients on 1.17 servers
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onItemDrop(final PlayerDropItemEvent event) {
+        final Player player = event.getPlayer();
+        if (!isOnPipe(player)) {
+            return;
+        }
+
+        // Resend the item in the hand
+        final int slot = player.getInventory().getHeldItemSlot();
+        final ItemStack item = player.getInventory().getItem(slot);
+        player.getInventory().setItem(slot, item);
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/provider/BukkitAdvancementCriteriaProvider.java

@@ -0,0 +1,34 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.provider;
+
+import com.viaversion.viabackwards.protocol.v1_20_2to1_20.provider.AdvancementCriteriaProvider;
+import org.bukkit.Bukkit;
+import org.bukkit.NamespacedKey;
+import org.bukkit.advancement.Advancement;
+
+public final class BukkitAdvancementCriteriaProvider extends AdvancementCriteriaProvider {
+
+    private static final String[] EMPTY_CRITERIA = new String[0];
+
+    @Override
+    public String[] getCriteria(final String key) {
+        final Advancement advancement = Bukkit.getAdvancement(NamespacedKey.fromString(key));
+        return advancement == null ? EMPTY_CRITERIA : advancement.getCriteria().toArray(EMPTY_CRITERIA);
+    }
+}

bukkit/src/main/resources/plugin.yml

@@ -0,0 +1,11 @@
+name: ViaBackwards
+version: ${version}
+description: ${description}
+main: com.viaversion.viabackwards.BukkitPlugin
+api-version: 1.13
+folia-supported: true
+
+authors: [Matsv, kennytv, Gerrygames, creeper123123321, ForceUpdate1, EnZaXD]
+website: ${url}
+
+depend: [ViaVersion]

common/build.gradle.kts

@@ -0,0 +1,26 @@
+plugins {
+    id("net.kyori.blossom")
+    id("org.jetbrains.gradle.plugin.idea-ext")
+}
+
+sourceSets {
+    main {
+        blossom {
+            javaSources {
+                property("version", project.version.toString())
+                property("impl_version", "git-ViaBackwards-${project.version}:${rootProject.latestCommitHash()}")
+            }
+        }
+    }
+}
+
+dependencies {
+    compileOnlyApi(libs.viaver)
+    compileOnlyApi(libs.netty)
+    compileOnlyApi(libs.guava)
+    compileOnlyApi(libs.checkerQual)
+}
+
+java {
+    withJavadocJar()
+}

common/src/main/java-templates/com/viaversion/viabackwards/utils/VersionInfo.java

@@ -0,0 +1,32 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2023 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.utils;
+
+public final class VersionInfo {
+
+    public static final String VERSION = "{{ version }}";
+    private static final String IMPLEMENTATION_VERSION = "{{ impl_version }}";
+
+    public static String getVersion() {
+        return VERSION;
+    }
+
+    public static String getImplementationVersion() {
+        return IMPLEMENTATION_VERSION;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/ViaBackwards.java

@@ -0,0 +1,44 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.api.ViaBackwardsConfig;
+import com.viaversion.viabackwards.api.ViaBackwardsPlatform;
+
+public final class ViaBackwards {
+
+    private static ViaBackwardsPlatform platform;
+    private static ViaBackwardsConfig config;
+
+    public static void init(ViaBackwardsPlatform platform, ViaBackwardsConfig config) {
+        Preconditions.checkArgument(ViaBackwards.platform == null, "ViaBackwards is already initialized");
+
+        ViaBackwards.platform = platform;
+        ViaBackwards.config = config;
+    }
+
+    public static ViaBackwardsPlatform getPlatform() {
+        return platform;
+    }
+
+    public static ViaBackwardsConfig getConfig() {
+        return config;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/ViaBackwardsConfig.java

@@ -0,0 +1,112 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards;
+
+import com.viaversion.viaversion.util.Config;
+import java.io.File;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Logger;
+
+public class ViaBackwardsConfig extends Config implements com.viaversion.viabackwards.api.ViaBackwardsConfig {
+
+    private boolean addCustomEnchantsToLore;
+    private boolean addTeamColorToPrefix;
+    private boolean fix1_13FacePlayer;
+    private boolean alwaysShowOriginalMobName;
+    private boolean fix1_13FormattedInventoryTitles;
+    private boolean handlePingsAsInvAcknowledgements;
+    private boolean suppressEmulationWarnings;
+
+    public ViaBackwardsConfig(File configFile, Logger logger) {
+        super(configFile, logger);
+    }
+
+    @Override
+    public void reload() {
+        super.reload();
+        loadFields();
+    }
+
+    private void loadFields() {
+        addCustomEnchantsToLore = getBoolean("add-custom-enchants-into-lore", true);
+        addTeamColorToPrefix = getBoolean("add-teamcolor-to-prefix", true);
+        fix1_13FacePlayer = getBoolean("fix-1_13-face-player", false);
+        fix1_13FormattedInventoryTitles = getBoolean("fix-formatted-inventory-titles", true);
+        alwaysShowOriginalMobName = getBoolean("always-show-original-mob-name", true);
+        handlePingsAsInvAcknowledgements = getBoolean("handle-pings-as-inv-acknowledgements", false);
+        suppressEmulationWarnings = getBoolean("suppress-emulation-warnings", false);
+    }
+
+    @Override
+    public boolean addCustomEnchantsToLore() {
+        return addCustomEnchantsToLore;
+    }
+
+    @Override
+    public boolean addTeamColorTo1_13Prefix() {
+        return addTeamColorToPrefix;
+    }
+
+    @Override
+    public boolean isFix1_13FacePlayer() {
+        return fix1_13FacePlayer;
+    }
+
+    @Override
+    public boolean fix1_13FormattedInventoryTitle() {
+        return fix1_13FormattedInventoryTitles;
+    }
+
+    @Override
+    public boolean alwaysShowOriginalMobName() {
+        return alwaysShowOriginalMobName;
+    }
+
+    @Override
+    public boolean handlePingsAsInvAcknowledgements() {
+        return handlePingsAsInvAcknowledgements || Boolean.getBoolean("com.viaversion.handlePingsAsInvAcknowledgements");
+    }
+
+    @Override
+    public boolean suppressEmulationWarnings() {
+        return suppressEmulationWarnings;
+    }
+
+    @Override
+    public URL getDefaultConfigURL() {
+        return getClass().getClassLoader().getResource("assets/viabackwards/config.yml");
+    }
+
+    @Override
+    public InputStream getDefaultConfigInputStream() {
+        return getClass().getClassLoader().getResourceAsStream("assets/viabackwards/config.yml");
+    }
+
+    @Override
+    protected void handleConfig(Map<String, Object> map) {
+    }
+
+    @Override
+    public List<String> getUnsupportedOptions() {
+        return Collections.emptyList();
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/BackwardsProtocol.java

@@ -0,0 +1,72 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api;
+
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.AbstractProtocol;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class BackwardsProtocol<CU extends ClientboundPacketType, CM extends ClientboundPacketType, SM extends ServerboundPacketType, SU extends ServerboundPacketType>
+    extends AbstractProtocol<CU, CM, SM, SU> {
+
+    protected BackwardsProtocol() {
+    }
+
+    protected BackwardsProtocol(@Nullable Class<CU> oldClientboundPacketEnum, @Nullable Class<CM> clientboundPacketEnum,
+                                @Nullable Class<SM> oldServerboundPacketEnum, @Nullable Class<SU> serverboundPacketEnum) {
+        super(oldClientboundPacketEnum, clientboundPacketEnum, oldServerboundPacketEnum, serverboundPacketEnum);
+    }
+
+    /**
+     * Waits for the given protocol to be loaded to then asynchronously execute the runnable for this protocol.
+     */
+    protected void executeAsyncAfterLoaded(Class<? extends Protocol> protocolClass, Runnable runnable) {
+        Via.getManager().getProtocolManager().addMappingLoaderFuture(getClass(), protocolClass, runnable);
+    }
+
+    @Override
+    protected void registerPackets() {
+        super.registerPackets();
+
+        final BackwardsMappingData mappingData = getMappingData();
+        if (mappingData != null && mappingData.getViaVersionProtocolClass() != null) {
+            executeAsyncAfterLoaded(mappingData.getViaVersionProtocolClass(), this::loadMappingData);
+        }
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        // Manually load them later, since they depend on VV's mappings
+        return false;
+    }
+
+    @Override
+    public @Nullable BackwardsMappingData getMappingData() { // Change return type to BackwardsMappings
+        return null;
+    }
+
+    @Override
+    public @Nullable TranslatableRewriter<CU> getComponentRewriter() {
+        return null;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsConfig.java

@@ -0,0 +1,73 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api;
+
+import com.viaversion.viaversion.api.configuration.Config;
+
+public interface ViaBackwardsConfig extends Config {
+
+    /**
+     * Mimics name and level of a custom enchant through the item's lore.
+     *
+     * @return true if enabled
+     */
+    boolean addCustomEnchantsToLore();
+
+    /**
+     * Writes the color of the scoreboard team after the prefix.
+     *
+     * @return true if enabled
+     */
+    boolean addTeamColorTo1_13Prefix();
+
+    /**
+     * Converts the new 1.13 face player packets to look packets.
+     *
+     * @return true if enabled
+     */
+    boolean isFix1_13FacePlayer();
+
+    /**
+     * Converts the 1.13 face look-at packet for 1.12- players. Requires a bit of extra caching.
+     *
+     * @return true if enabled
+     */
+    boolean fix1_13FormattedInventoryTitle();
+
+    /**
+     * Always shows the original mob's name instead of only when hovering over them with the cursor.
+     *
+     * @return true if enabled
+     */
+    boolean alwaysShowOriginalMobName();
+
+    /**
+     * Sends inventory acknowledgement packets to act as a replacement for ping packets for sub 1.17 clients.
+     * This only takes effect for ids in the short range. Useful for anticheat compatibility.
+     *
+     * @return true if enabled
+     */
+    boolean handlePingsAsInvAcknowledgements();
+
+    /**
+     * Suppresses warnings of missing emulations for certain features that are not supported (e.g. world height in 1.17+).
+     *
+     * @return true if enabled
+     */
+    boolean suppressEmulationWarnings();
+}

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java

@@ -0,0 +1,178 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.ViaBackwardsConfig;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.Protocol1_11To1_10;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viabackwards.protocol.v1_11_1to1_11.Protocol1_11_1To1_11;
+import com.viaversion.viabackwards.protocol.v1_12_2to1_12_1.Protocol1_12_2To1_12_1;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.Protocol1_13To1_12_2;
+import com.viaversion.viabackwards.protocol.v1_12_1to1_12.Protocol1_12_1To1_12;
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.Protocol1_13_2To1_13_1;
+import com.viaversion.viabackwards.protocol.v1_14to1_13_2.Protocol1_14To1_13_2;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viabackwards.protocol.v1_14_2to1_14_1.Protocol1_14_2To1_14_1;
+import com.viaversion.viabackwards.protocol.v1_14_3to1_14_2.Protocol1_14_3To1_14_2;
+import com.viaversion.viabackwards.protocol.v1_14_4to1_14_3.Protocol1_14_4To1_14_3;
+import com.viaversion.viabackwards.protocol.v1_15to1_14_4.Protocol1_15To1_14_4;
+import com.viaversion.viabackwards.protocol.v1_14_1to1_14.Protocol1_14_1To1_14;
+import com.viaversion.viabackwards.protocol.v1_15_2to1_15_1.Protocol1_15_2To1_15_1;
+import com.viaversion.viabackwards.protocol.v1_16to1_15_2.Protocol1_16To1_15_2;
+import com.viaversion.viabackwards.protocol.v1_15_1to1_15.Protocol1_15_1To1_15;
+import com.viaversion.viabackwards.protocol.v1_16_2to1_16_1.Protocol1_16_2To1_16_1;
+import com.viaversion.viabackwards.protocol.v1_16_3to1_16_2.Protocol1_16_3To1_16_2;
+import com.viaversion.viabackwards.protocol.v1_16_4to1_16_3.Protocol1_16_4To1_16_3;
+import com.viaversion.viabackwards.protocol.v1_17to1_16_4.Protocol1_17To1_16_4;
+import com.viaversion.viabackwards.protocol.v1_16_1to1_16.Protocol1_16_1To1_16;
+import com.viaversion.viabackwards.protocol.v1_18to1_17_1.Protocol1_18To1_17_1;
+import com.viaversion.viabackwards.protocol.v1_17_1to1_17.Protocol1_17_1To1_17;
+import com.viaversion.viabackwards.protocol.v1_19to1_18_2.Protocol1_19To1_18_2;
+import com.viaversion.viabackwards.protocol.v1_18_2to1_18.Protocol1_18_2To1_18;
+import com.viaversion.viabackwards.protocol.v1_19_3to1_19_1.Protocol1_19_3To1_19_1;
+import com.viaversion.viabackwards.protocol.v1_19_4to1_19_3.Protocol1_19_4To1_19_3;
+import com.viaversion.viabackwards.protocol.v1_20to1_19_4.Protocol1_20To1_19_4;
+import com.viaversion.viabackwards.protocol.v1_19_1to1_19.Protocol1_19_1To1_19;
+import com.viaversion.viabackwards.protocol.v1_20_3to1_20_2.Protocol1_20_3To1_20_2;
+import com.viaversion.viabackwards.protocol.v1_20_5to1_20_3.Protocol1_20_5To1_20_3;
+import com.viaversion.viabackwards.protocol.v1_20_2to1_20.Protocol1_20_2To1_20;
+import com.viaversion.viabackwards.protocol.v1_21to1_20_5.Protocol1_21To1_20_5;
+import com.viaversion.viabackwards.protocol.v1_9_3to1_9_1.Protocol1_9_3To1_9_1;
+import com.viaversion.viabackwards.protocol.v1_10to1_9_3.Protocol1_10To1_9_3;
+import com.viaversion.viabackwards.protocol.v1_9_1to1_9.Protocol1_9_1To1_9;
+import com.viaversion.viabackwards.utils.VersionInfo;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.ProtocolManager;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import com.viaversion.viaversion.update.Version;
+import java.io.File;
+import java.util.Arrays;
+import java.util.logging.Logger;
+
+public interface ViaBackwardsPlatform {
+
+    String MINIMUM_VV_VERSION = "5.0.0";
+
+    /**
+     * Initialize ViaBackwards.
+     */
+    default void init(final File configFile) {
+        ViaBackwardsConfig config = new ViaBackwardsConfig(configFile, getLogger());
+        config.reload();
+        Via.getManager().getConfigurationProvider().register(config);
+
+        ViaBackwards.init(this, config);
+
+        if (isOutdated()) {
+            disable();
+            return;
+        }
+
+        Via.getManager().getSubPlatforms().add(VersionInfo.getImplementationVersion());
+
+        getLogger().info("Loading translations...");
+        TranslatableRewriter.loadTranslatables();
+
+        getLogger().info("Registering protocols...");
+        final ProtocolManager protocolManager = Via.getManager().getProtocolManager();
+        protocolManager.registerProtocol(new Protocol1_9_1To1_9(), ProtocolVersion.v1_9, ProtocolVersion.v1_9_1);
+        protocolManager.registerProtocol(new Protocol1_9_3To1_9_1(), Arrays.asList(ProtocolVersion.v1_9_1, ProtocolVersion.v1_9_2), ProtocolVersion.v1_9_3);
+        protocolManager.registerProtocol(new Protocol1_10To1_9_3(), ProtocolVersion.v1_9_3, ProtocolVersion.v1_10);
+
+        protocolManager.registerProtocol(new Protocol1_11To1_10(), ProtocolVersion.v1_10, ProtocolVersion.v1_11);
+        protocolManager.registerProtocol(new Protocol1_11_1To1_11(), ProtocolVersion.v1_11, ProtocolVersion.v1_11_1);
+
+        protocolManager.registerProtocol(new Protocol1_12To1_11_1(), ProtocolVersion.v1_11_1, ProtocolVersion.v1_12);
+        protocolManager.registerProtocol(new Protocol1_12_1To1_12(), ProtocolVersion.v1_12, ProtocolVersion.v1_12_1);
+        protocolManager.registerProtocol(new Protocol1_12_2To1_12_1(), ProtocolVersion.v1_12_1, ProtocolVersion.v1_12_2);
+
+        protocolManager.registerProtocol(new Protocol1_13To1_12_2(), ProtocolVersion.v1_12_2, ProtocolVersion.v1_13);
+        protocolManager.registerProtocol(new Protocol1_13_1To1_13(), ProtocolVersion.v1_13, ProtocolVersion.v1_13_1);
+        protocolManager.registerProtocol(new Protocol1_13_2To1_13_1(), ProtocolVersion.v1_13_1, ProtocolVersion.v1_13_2);
+
+        protocolManager.registerProtocol(new Protocol1_14To1_13_2(), ProtocolVersion.v1_13_2, ProtocolVersion.v1_14);
+        protocolManager.registerProtocol(new Protocol1_14_1To1_14(), ProtocolVersion.v1_14, ProtocolVersion.v1_14_1);
+        protocolManager.registerProtocol(new Protocol1_14_2To1_14_1(), ProtocolVersion.v1_14_1, ProtocolVersion.v1_14_2);
+        protocolManager.registerProtocol(new Protocol1_14_3To1_14_2(), ProtocolVersion.v1_14_2, ProtocolVersion.v1_14_3);
+        protocolManager.registerProtocol(new Protocol1_14_4To1_14_3(), ProtocolVersion.v1_14_3, ProtocolVersion.v1_14_4);
+
+        protocolManager.registerProtocol(new Protocol1_15To1_14_4(), ProtocolVersion.v1_14_4, ProtocolVersion.v1_15);
+        protocolManager.registerProtocol(new Protocol1_15_1To1_15(), ProtocolVersion.v1_15, ProtocolVersion.v1_15_1);
+        protocolManager.registerProtocol(new Protocol1_15_2To1_15_1(), ProtocolVersion.v1_15_1, ProtocolVersion.v1_15_2);
+
+        protocolManager.registerProtocol(new Protocol1_16To1_15_2(), ProtocolVersion.v1_15_2, ProtocolVersion.v1_16);
+        protocolManager.registerProtocol(new Protocol1_16_1To1_16(), ProtocolVersion.v1_16, ProtocolVersion.v1_16_1);
+        protocolManager.registerProtocol(new Protocol1_16_2To1_16_1(), ProtocolVersion.v1_16_1, ProtocolVersion.v1_16_2);
+        protocolManager.registerProtocol(new Protocol1_16_3To1_16_2(), ProtocolVersion.v1_16_2, ProtocolVersion.v1_16_3);
+        protocolManager.registerProtocol(new Protocol1_16_4To1_16_3(), ProtocolVersion.v1_16_3, ProtocolVersion.v1_16_4);
+
+        protocolManager.registerProtocol(new Protocol1_17To1_16_4(), ProtocolVersion.v1_16_4, ProtocolVersion.v1_17);
+        protocolManager.registerProtocol(new Protocol1_17_1To1_17(), ProtocolVersion.v1_17, ProtocolVersion.v1_17_1);
+
+        protocolManager.registerProtocol(new Protocol1_18To1_17_1(), ProtocolVersion.v1_17_1, ProtocolVersion.v1_18);
+        protocolManager.registerProtocol(new Protocol1_18_2To1_18(), ProtocolVersion.v1_18, ProtocolVersion.v1_18_2);
+
+        protocolManager.registerProtocol(new Protocol1_19To1_18_2(), ProtocolVersion.v1_18_2, ProtocolVersion.v1_19);
+        protocolManager.registerProtocol(new Protocol1_19_1To1_19(), ProtocolVersion.v1_19, ProtocolVersion.v1_19_1);
+        protocolManager.registerProtocol(new Protocol1_19_3To1_19_1(), ProtocolVersion.v1_19_1, ProtocolVersion.v1_19_3);
+        protocolManager.registerProtocol(new Protocol1_19_4To1_19_3(), ProtocolVersion.v1_19_3, ProtocolVersion.v1_19_4);
+
+        protocolManager.registerProtocol(new Protocol1_20To1_19_4(), ProtocolVersion.v1_19_4, ProtocolVersion.v1_20);
+        protocolManager.registerProtocol(new Protocol1_20_2To1_20(), ProtocolVersion.v1_20, ProtocolVersion.v1_20_2);
+        protocolManager.registerProtocol(new Protocol1_20_3To1_20_2(), ProtocolVersion.v1_20_2, ProtocolVersion.v1_20_3);
+        protocolManager.registerProtocol(new Protocol1_20_5To1_20_3(), ProtocolVersion.v1_20_3, ProtocolVersion.v1_20_5);
+
+        protocolManager.registerProtocol(new Protocol1_21To1_20_5(), ProtocolVersion.v1_20_5, ProtocolVersion.v1_21);
+    }
+
+    /**
+     * Logger provided by the platform.
+     *
+     * @return logger instance
+     */
+    Logger getLogger();
+
+    default boolean isOutdated() {
+        String vvVersion = Via.getPlatform().getPluginVersion();
+        if (vvVersion != null && new Version(vvVersion).compareTo(new Version(MINIMUM_VV_VERSION + "--")) < 0) {
+            getLogger().severe("================================");
+            getLogger().severe("YOUR VIAVERSION IS OUTDATED (you are running " + vvVersion + ")");
+            getLogger().severe("PLEASE USE VIAVERSION " + MINIMUM_VV_VERSION + " OR NEWER");
+            getLogger().severe("LINK: https://ci.viaversion.com/");
+            getLogger().severe("VIABACKWARDS WILL NOW DISABLE");
+            getLogger().severe("================================");
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Disable the plugin.
+     */
+    void disable();
+
+    /**
+     * Returns ViaBackwards's data folder.
+     *
+     * @return data folder
+     */
+    File getDataFolder();
+}

common/src/main/java/com/viaversion/viabackwards/api/data/BackwardsMappingData.java

@@ -0,0 +1,207 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.BiMappings;
+import com.viaversion.viaversion.api.data.IdentityMappings;
+import com.viaversion.viaversion.api.data.MappingData;
+import com.viaversion.viaversion.api.data.MappingDataBase;
+import com.viaversion.viaversion.api.data.Mappings;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectArrayMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.util.Key;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsMappingData extends MappingDataBase {
+
+    private final Class<? extends Protocol<?, ?, ?, ?>> vvProtocolClass;
+    protected Int2ObjectMap<MappedItem> backwardsItemMappings;
+    private Map<String, String> backwardsSoundMappings;
+    private Map<String, String> entityNames;
+    private Int2ObjectMap<String> enchantmentNames;
+
+    public BackwardsMappingData(final String unmappedVersion, final String mappedVersion) {
+        this(unmappedVersion, mappedVersion, null);
+    }
+
+    public BackwardsMappingData(final String unmappedVersion, final String mappedVersion, @Nullable final Class<? extends Protocol<?, ?, ?, ?>> vvProtocolClass) {
+        super(unmappedVersion, mappedVersion);
+        Preconditions.checkArgument(vvProtocolClass == null || !BackwardsProtocol.class.isAssignableFrom(vvProtocolClass));
+        this.vvProtocolClass = vvProtocolClass;
+    }
+
+    @Override
+    protected void loadExtras(final CompoundTag data) {
+        final CompoundTag itemNames = data.getCompoundTag("itemnames");
+        if (itemNames != null) {
+            Preconditions.checkNotNull(itemMappings);
+            backwardsItemMappings = new Int2ObjectOpenHashMap<>(itemNames.size());
+
+            final CompoundTag extraItemData = data.getCompoundTag("itemdata");
+            for (final Map.Entry<String, Tag> entry : itemNames.entrySet()) {
+                final StringTag name = (StringTag) entry.getValue();
+                final int id = Integer.parseInt(entry.getKey());
+                Integer customModelData = null;
+                if (extraItemData != null && extraItemData.contains(entry.getKey())) {
+                    final CompoundTag entryTag = extraItemData.getCompoundTag(entry.getKey());
+                    final NumberTag customModelDataTag = entryTag.getNumberTag("custom_model_data");
+                    customModelData = customModelDataTag != null ? customModelDataTag.asInt() : null;
+                }
+
+                backwardsItemMappings.put(id, new MappedItem(getNewItemId(id), name.getValue(), customModelData));
+            }
+        }
+
+        this.entityNames = loadNameByStringMappings(data, "entitynames");
+        this.enchantmentNames = loadNameByIdMappings(data, "enchantmentnames");
+        this.backwardsSoundMappings = loadNameByStringMappings(data, "soundnames");
+    }
+
+    private @Nullable Map<String, String> loadNameByStringMappings(final CompoundTag data, final String key) {
+        final CompoundTag nameMappings = data.getCompoundTag(key);
+        if (nameMappings == null) {
+            return null;
+        }
+
+        final Map<String, String> map = new HashMap<>(nameMappings.size());
+        for (final Map.Entry<String, Tag> entry : nameMappings.entrySet()) {
+            final StringTag mappedTag = (StringTag) entry.getValue();
+            map.put(entry.getKey(), mappedTag.getValue());
+        }
+        return map;
+    }
+
+    private @Nullable Int2ObjectMap<String> loadNameByIdMappings(final CompoundTag data, final String key) {
+        final CompoundTag nameMappings = data.getCompoundTag(key);
+        if (nameMappings == null) {
+            return null;
+        }
+
+        final Int2ObjectMap<String> map = new Int2ObjectArrayMap<>(nameMappings.size());
+        for (final Map.Entry<String, Tag> entry : nameMappings.entrySet()) {
+            final StringTag mappedTag = (StringTag) entry.getValue();
+            map.put(Integer.parseInt(entry.getKey()), mappedTag.getValue());
+        }
+        return map;
+    }
+
+    @Override
+    protected @Nullable BiMappings loadBiMappings(final CompoundTag data, final String key) {
+        if (key.equals("items") && vvProtocolClass != null) {
+            Mappings mappings = super.loadMappings(data, key);
+            final MappingData mappingData = Via.getManager().getProtocolManager().getProtocol(vvProtocolClass).getMappingData();
+            if (mappingData != null && mappingData.getItemMappings() != null) {
+                final BiMappings vvItemMappings = mappingData.getItemMappings();
+                if (mappings == null) {
+                    mappings = new IdentityMappings(vvItemMappings.mappedSize(), vvItemMappings.size());
+                }
+                return ItemMappings.of(mappings, vvItemMappings);
+            }
+        }
+        return super.loadBiMappings(data, key);
+    }
+
+    /**
+     * @see #getMappedItem(int) for custom backwards mappings
+     */
+    @Override
+    public int getNewItemId(final int id) {
+        // Don't warn on missing here
+        return this.itemMappings.getNewId(id);
+    }
+
+    @Override
+    public int getNewBlockId(final int id) {
+        // Don't warn on missing here
+        return this.blockMappings.getNewId(id);
+    }
+
+    @Override
+    public int getOldItemId(final int id) {
+        // Warn on missing
+        return checkValidity(id, this.itemMappings.inverse().getNewId(id), "item");
+    }
+
+    @Override
+    public int getNewAttributeId(final int id) {
+        return this.attributeMappings.getNewId(id);
+    }
+
+    public @Nullable MappedItem getMappedItem(final int id) {
+        return backwardsItemMappings != null ? backwardsItemMappings.get(id) : null;
+    }
+
+    public @Nullable String getMappedNamedSound(final String id) {
+        if (backwardsSoundMappings == null) {
+            return null;
+        }
+        return backwardsSoundMappings.get(Key.stripMinecraftNamespace(id));
+    }
+
+    public @Nullable String mappedEntityName(final String entityName) {
+        if (entityNames == null) {
+            getLogger().log(Level.SEVERE, "No entity mappings found when requesting them for " + entityName, new RuntimeException());
+            return null;
+        }
+        return entityNames.get(entityName);
+    }
+
+    public @Nullable String mappedEnchantmentName(final int enchantmentId) {
+        if (enchantmentNames == null) {
+            ViaBackwards.getPlatform().getLogger().log(Level.SEVERE, "No enchantment name mappings found when requesting " + enchantmentId, new RuntimeException());
+            return null;
+        }
+        return enchantmentNames.get(enchantmentId);
+    }
+
+    public @Nullable Int2ObjectMap<MappedItem> getBackwardsItemMappings() {
+        return backwardsItemMappings;
+    }
+
+    public @Nullable Map<String, String> getBackwardsSoundMappings() {
+        return backwardsSoundMappings;
+    }
+
+    public @Nullable Class<? extends Protocol<?, ?, ?, ?>> getViaVersionProtocolClass() {
+        return vvProtocolClass;
+    }
+
+    @Override
+    protected Logger getLogger() {
+        return ViaBackwards.getPlatform().getLogger();
+    }
+
+    @Override
+    protected @Nullable CompoundTag readMappingsFile(final String name) {
+        return BackwardsMappingDataLoader.INSTANCE.loadNBTFromDir(name);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/BackwardsMappingDataLoader.java

@@ -0,0 +1,87 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.Tag;
+import java.io.File;
+import java.io.IOException;
+import java.util.Map;
+import java.util.logging.Logger;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsMappingDataLoader extends MappingDataLoader {
+
+    public static final BackwardsMappingDataLoader INSTANCE = new BackwardsMappingDataLoader(BackwardsMappingDataLoader.class, "assets/viabackwards/data/");
+
+    public BackwardsMappingDataLoader(final Class<?> dataLoaderClass, final String dataPath) {
+        super(dataLoaderClass, dataPath);
+    }
+
+    /**
+     * Returns nbt data from the plugin folder or packed assets.
+     * If a file with the same name exists in the plugin folder, the data of the original packed tag will be merged with the file's tag.
+     *
+     * @param name name of the file
+     * @return nbt data from the plugin folder or packed assets
+     */
+    public @Nullable CompoundTag loadNBTFromDir(final String name) {
+        final CompoundTag packedData = loadNBT(name);
+
+        final File file = new File(getDataFolder(), name);
+        if (!file.exists()) {
+            return packedData;
+        }
+
+        getLogger().info("Loading " + name + " from plugin folder");
+        try {
+            final CompoundTag fileData = MAPPINGS_READER.read(file.toPath(), false);
+            return mergeTags(packedData, fileData);
+        } catch (final IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private CompoundTag mergeTags(final CompoundTag original, final CompoundTag extra) {
+        for (final Map.Entry<String, Tag> entry : extra.entrySet()) {
+            if (entry.getValue() instanceof CompoundTag) {
+                // For compound tags, don't replace the entire tag
+                final CompoundTag originalEntry = original.getCompoundTag(entry.getKey());
+                if (originalEntry != null) {
+                    mergeTags(originalEntry, (CompoundTag) entry.getValue());
+                    continue;
+                }
+            }
+
+            original.put(entry.getKey(), entry.getValue());
+        }
+        return original;
+    }
+
+    @Override
+    public Logger getLogger() {
+        return ViaBackwards.getPlatform().getLogger();
+    }
+
+    @Override
+    public File getDataFolder() {
+        return ViaBackwards.getPlatform().getDataFolder();
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/ItemMappings.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.viaversion.api.data.BiMappingsBase;
+import com.viaversion.viaversion.api.data.Mappings;
+
+public final class ItemMappings extends BiMappingsBase {
+
+    private ItemMappings(final Mappings mappings, final Mappings inverse) {
+        super(mappings, inverse);
+    }
+
+    public static ItemMappings of(final Mappings mappings, final Mappings inverse) {
+        return new ItemMappings(mappings, inverse);
+    }
+
+    @Override
+    public void setNewId(final int id, final int mappedId) {
+        // Only set one-way
+        mappings.setNewId(id, mappedId);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/MappedItem.java

@@ -0,0 +1,57 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class MappedItem {
+
+    private final int id;
+    private final String jsonName;
+    private final Tag tagName;
+    private final Integer customModelData;
+
+    public MappedItem(final int id, final String name) {
+        this(id, name, null);
+    }
+
+    public MappedItem(final int id, final String name, @Nullable final Integer customModelData) {
+        this.id = id;
+        this.jsonName = ComponentUtil.legacyToJsonString("§f" + name, true);
+        this.tagName = ComponentUtil.jsonStringToTag(jsonName);
+        this.customModelData = customModelData;
+    }
+
+    public int id() {
+        return id;
+    }
+
+    public String jsonName() {
+        return jsonName;
+    }
+
+    public Tag tagName() {
+        return tagName;
+    }
+
+    public @Nullable Integer customModelData() {
+        return customModelData;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/MappedLegacyBlockItem.java

@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viaversion.util.IdAndData;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class MappedLegacyBlockItem {
+
+    private final int id;
+    private final short data;
+    private final String name;
+    private final IdAndData block;
+    private BlockEntityHandler blockEntityHandler;
+
+    public MappedLegacyBlockItem(int id) {
+        this(id, (short) -1, null, Type.ITEM);
+    }
+
+    public MappedLegacyBlockItem(int id, short data, @Nullable String name, Type type) {
+        this.id = id;
+        this.data = data;
+        this.name = name != null ? "§f" + name : null;
+        this.block = type != Type.ITEM ? data != -1 ? new IdAndData(id, data) : new IdAndData(id) : null;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public short getData() {
+        return data;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public IdAndData getBlock() {
+        return block;
+    }
+
+    public boolean hasBlockEntityHandler() {
+        return blockEntityHandler != null;
+    }
+
+    public @Nullable BlockEntityHandler getBlockEntityHandler() {
+        return blockEntityHandler;
+    }
+
+    public void setBlockEntityHandler(@Nullable BlockEntityHandler blockEntityHandler) {
+        this.blockEntityHandler = blockEntityHandler;
+    }
+
+    @FunctionalInterface
+    public interface BlockEntityHandler {
+
+        CompoundTag handleOrNewCompoundTag(int block, CompoundTag tag);
+    }
+
+    public enum Type {
+
+        ITEM("items"),
+        BLOCK_ITEM("block-items"),
+        BLOCK("blocks");
+
+        final String name;
+
+        Type(final String name) {
+            this.name = name;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityObjectData.java

@@ -0,0 +1,39 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+
+public class EntityObjectData extends EntityReplacement {
+    private final int objectData;
+
+    public EntityObjectData(BackwardsProtocol<?, ?, ?, ?> protocol, String key, int id, int replacementId, int objectData) {
+        super(protocol, key, id, replacementId);
+        this.objectData = objectData;
+    }
+
+    @Override
+    public boolean isObjectType() {
+        return true;
+    }
+
+    @Override
+    public int objectData() {
+        return objectData;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityPositionHandler.java

@@ -0,0 +1,120 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viabackwards.api.rewriters.EntityRewriterBase;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.util.ProtocolLogger;
+import java.util.function.Supplier;
+
+public class EntityPositionHandler {
+
+    public static final double RELATIVE_MOVE_FACTOR = 32 * 128;
+    private final EntityRewriterBase<?, ?> entityRewriter;
+    private final Class<? extends EntityPositionStorage> storageClass;
+    private final Supplier<? extends EntityPositionStorage> storageSupplier;
+    private boolean warnedForMissingEntity;
+
+    public EntityPositionHandler(EntityRewriterBase<?, ?> entityRewriter,
+                                 Class<? extends EntityPositionStorage> storageClass, Supplier<? extends EntityPositionStorage> storageSupplier) {
+        this.entityRewriter = entityRewriter;
+        this.storageClass = storageClass;
+        this.storageSupplier = storageSupplier;
+    }
+
+    public void cacheEntityPosition(PacketWrapper wrapper, boolean create, boolean relative) {
+        cacheEntityPosition(wrapper,
+            wrapper.get(Types.DOUBLE, 0), wrapper.get(Types.DOUBLE, 1), wrapper.get(Types.DOUBLE, 2), create, relative);
+    }
+
+    public void cacheEntityPosition(PacketWrapper wrapper, double x, double y, double z, boolean create, boolean relative) {
+        int entityId = wrapper.get(Types.VAR_INT, 0);
+        StoredEntityData storedEntity = entityRewriter.tracker(wrapper.user()).entityData(entityId);
+        if (storedEntity == null) {
+            if (Via.getManager().isDebug()) { // There is too many plugins violating this out there, and reading seems to be hard! :>
+                ProtocolLogger logger = entityRewriter.protocol().getLogger();
+                logger.warning("Stored entity with id " + entityId + " missing at position: " + x + " - " + y + " - " + z + " in " + storageClass.getSimpleName());
+                if (entityId == -1 && x == 0 && y == 0 && z == 0) {
+                    logger.warning("DO NOT REPORT THIS TO VIA, THIS IS A PLUGIN ISSUE");
+                } else if (!warnedForMissingEntity) {
+                    warnedForMissingEntity = true;
+                    logger.warning("This is very likely caused by a plugin sending a teleport packet for an entity outside of the player's range.");
+                }
+            }
+            return;
+        }
+
+        EntityPositionStorage positionStorage;
+        if (create) {
+            positionStorage = storageSupplier.get();
+            storedEntity.put(positionStorage);
+        } else {
+            positionStorage = storedEntity.get(storageClass);
+            if (positionStorage == null) {
+                entityRewriter.protocol().getLogger().warning("Stored entity with id " + entityId + " missing " + storageClass.getSimpleName());
+                return;
+            }
+        }
+
+        positionStorage.setCoordinates(x, y, z, relative);
+    }
+
+    public EntityPositionStorage getStorage(UserConnection user, int entityId) {
+        StoredEntityData storedEntity = entityRewriter.tracker(user).entityData(entityId);
+        EntityPositionStorage entityStorage;
+        if (storedEntity == null || (entityStorage = storedEntity.get(EntityPositionStorage.class)) == null) {
+            entityRewriter.protocol().getLogger().warning("Untracked entity with id " + entityId + " in " + storageClass.getSimpleName());
+            return null;
+        }
+        return entityStorage;
+    }
+
+    public static void writeFacingAngles(PacketWrapper wrapper, double x, double y, double z, double targetX, double targetY, double targetZ) {
+        double dX = targetX - x;
+        double dY = targetY - y;
+        double dZ = targetZ - z;
+        double r = Math.sqrt(dX * dX + dY * dY + dZ * dZ);
+        double yaw = -Math.atan2(dX, dZ) / Math.PI * 180;
+        if (yaw < 0) {
+            yaw = 360 + yaw;
+        }
+        double pitch = -Math.asin(dY / r) / Math.PI * 180;
+
+        wrapper.write(Types.BYTE, (byte) (yaw * 256f / 360f));
+        wrapper.write(Types.BYTE, (byte) (pitch * 256f / 360f));
+    }
+
+    public static void writeFacingDegrees(PacketWrapper wrapper, double x, double y, double z, double targetX, double targetY, double targetZ) {
+        double dX = targetX - x;
+        double dY = targetY - y;
+        double dZ = targetZ - z;
+        double r = Math.sqrt(dX * dX + dY * dY + dZ * dZ);
+        double yaw = -Math.atan2(dX, dZ) / Math.PI * 180;
+        if (yaw < 0) {
+            yaw = 360 + yaw;
+        }
+        double pitch = -Math.asin(dY / r) / Math.PI * 180;
+
+        wrapper.write(Types.FLOAT, (float) yaw);
+        wrapper.write(Types.FLOAT, (float) pitch);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityPositionStorage.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+public abstract class EntityPositionStorage {
+    private double x;
+    private double y;
+    private double z;
+
+    public double x() {
+        return x;
+    }
+
+    public double y() {
+        return y;
+    }
+
+    public double z() {
+        return z;
+    }
+
+    public void setCoordinates(double x, double y, double z, boolean relative) {
+        if (relative) {
+            this.x += x;
+            this.y += y;
+            this.z += z;
+        } else {
+            this.x = x;
+            this.y = y;
+            this.z = z;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityReplacement.java

@@ -0,0 +1,134 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class EntityReplacement {
+    private final BackwardsProtocol<?, ?, ?, ?> protocol;
+    private final int id;
+    private final int replacementId;
+    private final String key;
+    private ComponentType componentType = ComponentType.NONE;
+    private MetaCreator defaultMeta;
+
+    public EntityReplacement(BackwardsProtocol<?, ?, ?, ?> protocol, EntityType type, int replacementId) {
+        this(protocol, type.name(), type.getId(), replacementId);
+    }
+
+    public EntityReplacement(BackwardsProtocol<?, ?, ?, ?> protocol, String key, int id, int replacementId) {
+        this.protocol = protocol;
+        this.id = id;
+        this.replacementId = replacementId;
+        this.key = key.toLowerCase(Locale.ROOT);
+    }
+
+    public EntityReplacement jsonName() {
+        this.componentType = ComponentType.JSON;
+        return this;
+    }
+
+    public EntityReplacement tagName() {
+        this.componentType = ComponentType.TAG;
+        return this;
+    }
+
+    public EntityReplacement plainName() {
+        this.componentType = ComponentType.PLAIN;
+        return this;
+    }
+
+    public EntityReplacement spawnMetadata(MetaCreator handler) {
+        this.defaultMeta = handler;
+        return this;
+    }
+
+    public boolean hasBaseMeta() {
+        return this.defaultMeta != null;
+    }
+
+    public int typeId() {
+        return id;
+    }
+
+    /**
+     * @return custom mobname, can be either a String or a JsonElement
+     */
+    public @Nullable Object entityName() {
+        if (componentType == ComponentType.NONE) {
+            return null;
+        }
+
+        final String name = protocol.getMappingData().mappedEntityName(key);
+        if (name == null) {
+            return null;
+        }
+
+        if (componentType == ComponentType.JSON) {
+            return ComponentUtil.legacyToJson(name);
+        } else if (componentType == ComponentType.TAG) {
+            return new StringTag(name);
+        }
+        return name;
+    }
+
+    public int replacementId() {
+        return replacementId;
+    }
+
+    public @Nullable MetaCreator defaultMeta() {
+        return defaultMeta;
+    }
+
+    public boolean isObjectType() {
+        return false;
+    }
+
+    public int objectData() {
+        return -1;
+    }
+
+    @Override
+    public String toString() {
+        return "EntityData{" +
+            "id=" + id +
+            ", mobName='" + key + '\'' +
+            ", replacementId=" + replacementId +
+            ", defaultMeta=" + defaultMeta +
+            '}';
+    }
+
+    @FunctionalInterface
+    public interface MetaCreator {
+
+        void createMeta(WrappedMetadata storage);
+    }
+
+    private enum ComponentType {
+        PLAIN,
+        JSON,
+        TAG,
+        NONE
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/PlayerPositionStorage.java

@@ -0,0 +1,71 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viaversion.api.connection.StorableObject;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Types;
+
+public abstract class PlayerPositionStorage implements StorableObject {
+    private double x;
+    private double y;
+    private double z;
+
+    protected PlayerPositionStorage() {
+    }
+
+    public double x() {
+        return x;
+    }
+
+    public double y() {
+        return y;
+    }
+
+    public double z() {
+        return z;
+    }
+
+    public void setX(final double x) {
+        this.x = x;
+    }
+
+    public void setY(final double y) {
+        this.y = y;
+    }
+
+    public void setZ(final double z) {
+        this.z = z;
+    }
+
+    public void setCoordinates(PacketWrapper wrapper, boolean relative) {
+        setCoordinates(wrapper.get(Types.DOUBLE, 0), wrapper.get(Types.DOUBLE, 1), wrapper.get(Types.DOUBLE, 2), relative);
+    }
+
+    public void setCoordinates(double x, double y, double z, boolean relative) {
+        if (relative) {
+            this.x += x;
+            this.y += y;
+            this.z += z;
+        } else {
+            this.x = x;
+            this.y = y;
+            this.z = z;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/WrappedMetadata.java

@@ -0,0 +1,51 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public record WrappedMetadata(List<EntityData> metadataList) {
+
+    public boolean has(EntityData data) {
+        return this.metadataList.contains(data);
+    }
+
+    public void remove(EntityData data) {
+        this.metadataList.remove(data);
+    }
+
+    public void remove(int index) {
+        metadataList.removeIf(meta -> meta.id() == index);
+    }
+
+    public void add(EntityData data) {
+        this.metadataList.add(data);
+    }
+
+    public @Nullable EntityData get(int index) {
+        for (EntityData meta : this.metadataList) {
+            if (index == meta.id()) {
+                return meta;
+            }
+        }
+        return null;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsItemRewriter.java

@@ -0,0 +1,125 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.nbt.tag.ByteTag;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.MappedItem;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.type.Type;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends BackwardsItemRewriterBase<C, S, T> {
+
+    public BackwardsItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType) {
+        super(protocol, itemType, itemArrayType, true);
+    }
+
+    public BackwardsItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType, true);
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(UserConnection connection, @Nullable Item item) {
+        if (item == null) {
+            return null;
+        }
+
+        CompoundTag display = item.tag() != null ? item.tag().getCompoundTag("display") : null;
+        if (protocol.getComponentRewriter() != null && display != null) {
+            // Handle name and lore components
+            StringTag name = display.getStringTag("Name");
+            if (name != null) {
+                String newValue = protocol.getComponentRewriter().processText(connection, name.getValue()).toString();
+                if (!newValue.equals(name.getValue())) {
+                    saveStringTag(display, name, "Name");
+                }
+
+                name.setValue(newValue);
+            }
+
+            ListTag<StringTag> lore = display.getListTag("Lore", StringTag.class);
+            if (lore != null) {
+                boolean changed = false;
+                for (StringTag loreEntry : lore) {
+                    String newValue = protocol.getComponentRewriter().processText(connection, loreEntry.getValue()).toString();
+                    if (!changed && !newValue.equals(loreEntry.getValue())) {
+                        // Backup original lore before doing any modifications
+                        changed = true;
+                        saveListTag(display, lore, "Lore");
+                    }
+
+                    loreEntry.setValue(newValue);
+                }
+            }
+        }
+
+        MappedItem data = protocol.getMappingData() != null ? protocol.getMappingData().getMappedItem(item.identifier()) : null;
+        if (data == null) {
+            // Just rewrite the id
+            return super.handleItemToClient(connection, item);
+        }
+
+        if (item.tag() == null) {
+            item.setTag(new CompoundTag());
+        }
+
+        // Save original id, set remapped id
+        item.tag().putInt(nbtTagName("id"), item.identifier());
+        item.setIdentifier(data.id());
+
+        // Add custom model data
+        if (data.customModelData() != null && !item.tag().contains("CustomModelData")) {
+            item.tag().putInt("CustomModelData", data.customModelData());
+        }
+
+        // Set custom name - only done if there is no original one
+        if (display == null) {
+            item.tag().put("display", display = new CompoundTag());
+        }
+        if (!display.contains("Name")) {
+            display.put("Name", new StringTag(data.jsonName()));
+            display.put(nbtTagName("customName"), new ByteTag(false));
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, @Nullable Item item) {
+        if (item == null) return null;
+
+        super.handleItemToServer(connection, item);
+        if (item.tag() != null) {
+            Tag originalId = item.tag().remove(nbtTagName("id"));
+            if (originalId instanceof IntTag) {
+                item.setIdentifier(((NumberTag) originalId).asInt());
+            }
+        }
+        return item;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsItemRewriterBase.java

@@ -0,0 +1,113 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.rewriter.ItemRewriter;
+import java.util.ArrayList;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class BackwardsItemRewriterBase<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends ItemRewriter<C, S, T> {
+
+    protected final boolean jsonNameFormat;
+
+    protected BackwardsItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType, boolean jsonFormat) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType);
+        this.jsonNameFormat = jsonFormat;
+    }
+
+    protected BackwardsItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, boolean jsonNameFormat) {
+        this(protocol, itemType, itemArrayType, itemType, itemArrayType, jsonNameFormat);
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, @Nullable Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+
+        restoreDisplayTag(item);
+        return item;
+    }
+
+    protected boolean hasBackupTag(CompoundTag tag, String tagName) {
+        return tag.contains(nbtTagName(tagName));
+    }
+
+    protected void saveStringTag(CompoundTag tag, StringTag original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            tag.putString(backupName, original.getValue());
+        }
+    }
+
+    protected void saveListTag(CompoundTag tag, ListTag<?> original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            tag.put(backupName, original.copy());
+        }
+    }
+
+    protected void restoreDisplayTag(Item item) {
+        if (item.tag() == null) return;
+
+        CompoundTag display = item.tag().getCompoundTag("display");
+        if (display != null) {
+            // Remove custom name / restore original name
+            if (display.remove(nbtTagName("customName")) != null) {
+                display.remove("Name");
+            } else {
+                restoreStringTag(display, "Name");
+            }
+
+            // Restore lore
+            restoreListTag(display, "Lore");
+        }
+    }
+
+    protected void restoreStringTag(CompoundTag tag, String tagName) {
+        Tag original = tag.remove(nbtTagName(tagName));
+        if (original instanceof StringTag) {
+            tag.putString(tagName, ((StringTag) original).getValue());
+        }
+    }
+
+    protected void restoreListTag(CompoundTag tag, String tagName) {
+        Tag original = tag.remove(nbtTagName(tagName));
+        if (original instanceof ListTag) {
+            tag.put(tagName, ((ListTag<?>) original).copy());
+        }
+    }
+
+    @Override
+    public String nbtTagName() {
+        return "VB|" + protocol.getClass().getSimpleName();
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsStructuredItemRewriter.java

@@ -0,0 +1,217 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.api.data.MappedItem;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.FullMappings;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntFunction;
+import com.viaversion.viaversion.rewriter.StructuredItemRewriter;
+import java.util.ArrayList;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsStructuredItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends StructuredItemRewriter<C, S, T> {
+
+    public BackwardsStructuredItemRewriter(final T protocol, final Type<Item> itemType, final Type<Item[]> itemArrayType) {
+        super(protocol, itemType, itemArrayType);
+    }
+
+    public BackwardsStructuredItemRewriter(final T protocol, final Type<Item> itemType, final Type<Item[]> itemArrayType, final Type<Item> mappedItemType, final Type<Item[]> mappedItemArrayType) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType);
+    }
+
+    @Override
+    public Item handleItemToClient(final UserConnection connection, final Item item) {
+        if (item.isEmpty()) {
+            return item;
+        }
+
+        final StructuredDataContainer dataContainer = item.dataContainer();
+        final BackwardsMappingData mappingData = protocol.getMappingData();
+        if (mappingData != null && mappingData.getDataComponentSerializerMappings() != null) {
+            final FullMappings mappings = mappingData.getDataComponentSerializerMappings();
+            dataContainer.setIdLookup(protocol, true);
+            dataContainer.updateIds(protocol, mappings::getNewId);
+        }
+
+        if (protocol.getComponentRewriter() != null) {
+            // Handle name and lore components
+            final StructuredData<Tag> customNameData = dataContainer.getNonEmpty(StructuredDataKey.CUSTOM_NAME);
+            if (customNameData != null) {
+                final Tag originalName = customNameData.value().copy();
+                protocol.getComponentRewriter().processTag(connection, customNameData.value());
+                if (!customNameData.value().equals(originalName)) {
+                    saveTag(createCustomTag(item), originalName, "Name");
+                }
+            }
+
+            final StructuredData<Tag[]> loreData = dataContainer.getNonEmpty(StructuredDataKey.LORE);
+            if (loreData != null) {
+                for (final Tag tag : loreData.value()) {
+                    protocol.getComponentRewriter().processTag(connection, tag);
+                }
+            }
+        }
+
+        Int2IntFunction itemIdRewriter = null;
+        Int2IntFunction blockIdRewriter = null;
+        if (mappingData != null) {
+            itemIdRewriter = mappingData.getItemMappings() != null ? mappingData::getNewItemId : null;
+            blockIdRewriter = mappingData.getBlockMappings() != null ? mappingData::getNewBlockId : null;
+        }
+
+        final MappedItem mappedItem = mappingData != null ? mappingData.getMappedItem(item.identifier()) : null;
+        if (mappedItem == null) {
+            // Just rewrite the id
+            if (mappingData != null && mappingData.getItemMappings() != null) {
+                item.setIdentifier(mappingData.getNewItemId(item.identifier()));
+            }
+
+            updateItemComponents(connection, dataContainer, this::handleItemToClient, itemIdRewriter, blockIdRewriter);
+            return item;
+        }
+
+        // Save original id, set remapped id
+        final CompoundTag tag = createCustomTag(item);
+        tag.putInt(nbtTagName("id"), item.identifier());
+        item.setIdentifier(mappedItem.id());
+
+        // Add custom model data
+        if (mappedItem.customModelData() != null && !dataContainer.contains(StructuredDataKey.CUSTOM_MODEL_DATA)) {
+            dataContainer.set(StructuredDataKey.CUSTOM_MODEL_DATA, mappedItem.customModelData());
+        }
+
+        // Set custom name - only done if there is no original one
+        if (!dataContainer.contains(StructuredDataKey.CUSTOM_NAME)) {
+            dataContainer.set(StructuredDataKey.CUSTOM_NAME, mappedItem.tagName());
+            tag.putBoolean(nbtTagName("customName"), true);
+        }
+
+        updateItemComponents(connection, dataContainer, this::handleItemToClient, itemIdRewriter, blockIdRewriter);
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(final UserConnection connection, final Item item) {
+        if (item.isEmpty()) {
+            return item;
+        }
+
+        final BackwardsMappingData mappingData = protocol.getMappingData();
+        final StructuredDataContainer dataContainer = item.dataContainer();
+        if (mappingData != null) {
+            if (mappingData.getItemMappings() != null) {
+                item.setIdentifier(mappingData.getOldItemId(item.identifier()));
+            }
+
+            final FullMappings dataComponentMappings = mappingData.getDataComponentSerializerMappings();
+            if (dataComponentMappings != null) {
+                dataContainer.setIdLookup(protocol, false);
+                dataContainer.updateIds(protocol, id -> dataComponentMappings.inverse().getNewId(id));
+            }
+        }
+
+
+        final CompoundTag tag = customTag(item);
+        if (tag != null) {
+            final Tag originalId = tag.remove(nbtTagName("id"));
+            if (originalId instanceof IntTag) {
+                item.setIdentifier(((NumberTag) originalId).asInt());
+            }
+        }
+
+        restoreTextComponents(item);
+
+        Int2IntFunction itemIdRewriter = null;
+        Int2IntFunction blockIdRewriter = null;
+        if (mappingData != null) {
+            itemIdRewriter = mappingData.getItemMappings() != null ? mappingData::getOldItemId : null;
+            blockIdRewriter = mappingData.getBlockMappings() != null ? mappingData::getOldBlockId : null;
+        }
+        updateItemComponents(connection, dataContainer, this::handleItemToServer, itemIdRewriter, blockIdRewriter);
+        return item;
+    }
+
+    protected @Nullable CompoundTag customTag(final Item item) {
+        final StructuredData<CompoundTag> customData = item.dataContainer().getNonEmpty(StructuredDataKey.CUSTOM_DATA);
+        return customData != null ? customData.value() : null;
+    }
+
+    protected void saveListTag(CompoundTag tag, ListTag<?> original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            tag.put(backupName, original.copy());
+        }
+    }
+
+    public <T extends Tag> @Nullable ListTag<T> removeListTag(CompoundTag tag, String tagName, Class<T> tagType) {
+        String backupName = nbtTagName(tagName);
+        ListTag<T> data = tag.getListTag(backupName, tagType);
+        if (data == null) {
+            return null;
+        }
+
+        tag.remove(backupName);
+        return data;
+    }
+
+    protected void saveGenericTagList(CompoundTag tag, List<Tag> original, String name) {
+        // List tags cannot contain tags of different types, so we have to store them a bit more awkwardly as an indexed compound tag
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            CompoundTag output = new CompoundTag();
+            for (int i = 0; i < original.size(); i++) {
+                output.put(Integer.toString(i), original.get(i));
+            }
+            tag.put(backupName, output);
+        }
+    }
+
+    protected List<Tag> removeGenericTagList(CompoundTag tag, String name) {
+        String backupName = nbtTagName(name);
+        CompoundTag data = tag.getCompoundTag(backupName);
+        if (data == null) {
+            return null;
+        }
+
+        tag.remove(backupName);
+        return new ArrayList<>(data.values());
+    }
+
+    @Override
+    public String nbtTagName() {
+        return "VB|" + protocol.getClass().getSimpleName();
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EnchantmentRewriter.java

@@ -0,0 +1,163 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.Key;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Rewriter to handle the addition of new enchantments.
+ */
+public class EnchantmentRewriter {
+
+    protected final Map<String, String> enchantmentMappings = new HashMap<>();
+    protected final BackwardsItemRewriter<?, ?, ?> itemRewriter;
+    private final boolean jsonFormat;
+
+    public EnchantmentRewriter(BackwardsItemRewriter<?, ?, ?> itemRewriter, boolean jsonFormat) {
+        this.itemRewriter = itemRewriter;
+        this.jsonFormat = jsonFormat;
+    }
+
+    public EnchantmentRewriter(BackwardsItemRewriter<?, ?, ?> itemRewriter) {
+        this(itemRewriter, true);
+    }
+
+    public void registerEnchantment(String key, String replacementLore) {
+        enchantmentMappings.put(Key.stripMinecraftNamespace(key), replacementLore);
+    }
+
+    public void handleToClient(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.getListTag("Enchantments") != null) {
+            rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.getListTag("StoredEnchantments") != null) {
+            rewriteEnchantmentsToClient(tag, true);
+        }
+    }
+
+    public void handleToServer(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.contains(itemRewriter.nbtTagName("Enchantments"))) {
+            rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.contains(itemRewriter.nbtTagName("StoredEnchantments"))) {
+            rewriteEnchantmentsToServer(tag, true);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "Enchantments";
+        ListTag<CompoundTag> enchantments = tag.getListTag(key, CompoundTag.class);
+        List<StringTag> loreToAdd = new ArrayList<>();
+        boolean changed = false;
+
+        Iterator<CompoundTag> iterator = enchantments.iterator();
+        while (iterator.hasNext()) {
+            CompoundTag enchantmentEntry = iterator.next();
+            StringTag idTag = enchantmentEntry.getStringTag("id");
+            if (idTag == null) {
+                continue;
+            }
+
+            String enchantmentId = Key.stripMinecraftNamespace(idTag.getValue());
+            String remappedName = enchantmentMappings.get(enchantmentId);
+            if (remappedName != null) {
+                if (!changed) {
+                    // Backup original before doing modifications
+                    itemRewriter.saveListTag(tag, enchantments, key);
+                    changed = true;
+                }
+
+                iterator.remove();
+
+                NumberTag levelTag = enchantmentEntry.getNumberTag("lvl");
+                int level = levelTag != null ? levelTag.asInt() : 1;
+                String loreValue = remappedName + " " + getRomanNumber(level);
+                if (jsonFormat) {
+                    loreValue = ComponentUtil.legacyToJsonString(loreValue);
+                }
+
+                loreToAdd.add(new StringTag(loreValue));
+            }
+        }
+
+        if (!loreToAdd.isEmpty()) {
+            // Add dummy enchant for the glow effect if there are no actual enchantments left
+            if (!storedEnchant && enchantments.isEmpty()) {
+                CompoundTag dummyEnchantment = new CompoundTag();
+                dummyEnchantment.putString("id", "");
+                dummyEnchantment.putShort("lvl", (short) 0);
+                enchantments.add(dummyEnchantment);
+            }
+
+            CompoundTag display = tag.getCompoundTag("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+
+            ListTag<StringTag> loreTag = display.getListTag("Lore", StringTag.class);
+            if (loreTag == null) {
+                display.put("Lore", loreTag = new ListTag<>(StringTag.class));
+            } else {
+                // Save original lore
+                itemRewriter.saveListTag(display, loreTag, "Lore");
+            }
+
+            loreToAdd.addAll(loreTag.getValue());
+            loreTag.setValue(loreToAdd);
+        }
+    }
+
+    public void rewriteEnchantmentsToServer(CompoundTag tag, boolean storedEnchant) {
+        // Just restore the original tag ig present (lore is always restored in the item rewriter)
+        String key = storedEnchant ? "StoredEnchantments" : "Enchantments";
+        itemRewriter.restoreListTag(tag, key);
+    }
+
+    public static String getRomanNumber(int number) {
+        return switch (number) {
+            case 1 -> "I";
+            case 2 -> "II";
+            case 3 -> "III";
+            case 4 -> "IV";
+            case 5 -> "V";
+            case 6 -> "VI";
+            case 7 -> "VII";
+            case 8 -> "VIII";
+            case 9 -> "IX";
+            case 10 -> "X";
+            default -> Integer.toString(number);
+        };
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriter.java

@@ -0,0 +1,154 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.data.entity.EntityTracker;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_14;
+
+public abstract class EntityRewriter<C extends ClientboundPacketType, T extends BackwardsProtocol<C, ?, ?, ?>> extends EntityRewriterBase<C, T> {
+
+    protected EntityRewriter(T protocol) {
+        this(protocol, Types1_14.ENTITY_DATA_TYPES.optionalComponentType, Types1_14.ENTITY_DATA_TYPES.booleanType);
+    }
+
+    protected EntityRewriter(T protocol, EntityDataType displayType, EntityDataType displayVisibilityType) {
+        super(protocol, displayType, 2, displayVisibilityType, 3);
+    }
+
+    @Override
+    public void registerTrackerWithData(C packetType, EntityType fallingBlockType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - Entity UUID
+                map(Types.VAR_INT); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Pitch
+                map(Types.BYTE); // 7 - Yaw
+                map(Types.INT); // 8 - Data
+                handler(getSpawnTrackerWithDataHandler(fallingBlockType));
+            }
+        });
+    }
+
+    @Override
+    public void registerTrackerWithData1_19(C packetType, EntityType fallingBlockType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // Entity id
+                map(Types.UUID); // Entity UUID
+                map(Types.VAR_INT); // Entity type
+                map(Types.DOUBLE); // X
+                map(Types.DOUBLE); // Y
+                map(Types.DOUBLE); // Z
+                map(Types.BYTE); // Pitch
+                map(Types.BYTE); // Yaw
+                map(Types.BYTE); // Head yaw
+                map(Types.VAR_INT); // Data
+                handler(getSpawnTrackerWithDataHandler1_19(fallingBlockType));
+            }
+        });
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler(EntityType fallingBlockType) {
+        return wrapper -> {
+            // Check against the UNMAPPED entity type
+            EntityType entityType = trackAndMapEntity(wrapper);
+            if (entityType == fallingBlockType) {
+                int blockState = wrapper.get(Types.INT, 0);
+                wrapper.set(Types.INT, 0, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler1_19(EntityType fallingBlockType) {
+        return wrapper -> {
+            if (protocol.getMappingData() == null) {
+                return;
+            }
+
+            // Check against the UNMAPPED entity type
+            EntityType entityType = trackAndMapEntity(wrapper);
+            if (entityType == fallingBlockType) {
+                int blockState = wrapper.get(Types.VAR_INT, 2);
+                wrapper.set(Types.VAR_INT, 2, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    public void registerSpawnTracker(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Entity UUID
+                map(Types.VAR_INT); // 2 - Entity Type
+                handler(wrapper -> trackAndMapEntity(wrapper));
+            }
+        });
+    }
+
+    /**
+     * Returns a handler to track the current world and uncache entity data on world changes.
+     *
+     * @return handler to track the current world
+     */
+    public PacketHandler worldTrackerHandlerByKey() {
+        return wrapper -> {
+            EntityTracker tracker = tracker(wrapper.user());
+            String world = wrapper.get(Types.STRING, 1);
+            if (tracker.currentWorld() != null && !tracker.currentWorld().equals(world)) {
+                tracker.clearEntities();
+                tracker.trackClientEntity();
+            }
+            tracker.setCurrentWorld(world);
+        };
+    }
+
+    /**
+     * Sets the mapped entity id and returns the unmapped entity type.
+     *
+     * @param wrapper packet wrapper
+     * @return unmapped (!) entity type
+     */
+    protected EntityType trackAndMapEntity(PacketWrapper wrapper) {
+        int typeId = wrapper.get(Types.VAR_INT, 1);
+        EntityType entityType = typeFromId(typeId);
+        tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), entityType);
+
+        int mappedTypeId = newEntityId(entityType.getId());
+        if (typeId != mappedTypeId) {
+            wrapper.set(Types.VAR_INT, 1, mappedTypeId);
+        }
+
+        return entityType;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java

@@ -0,0 +1,252 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.entities.storage.EntityReplacement;
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.data.entity.TrackedEntity;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.rewriter.EntityRewriter;
+import com.viaversion.viaversion.rewriter.entitydata.EntityDataHandlerEvent;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Entity rewriter base class.
+ *
+ * @see com.viaversion.viabackwards.api.rewriters.EntityRewriter
+ * @see LegacyEntityRewriter
+ */
+public abstract class EntityRewriterBase<C extends ClientboundPacketType, T extends BackwardsProtocol<C, ?, ?, ?>> extends EntityRewriter<C, T> {
+    private final Int2ObjectMap<EntityReplacement> entityDataMappings = new Int2ObjectOpenHashMap<>();
+    private final EntityDataType displayNameMetaType;
+    private final EntityDataType displayVisibilityMetaType;
+    private final int displayNameIndex;
+    private final int displayVisibilityIndex;
+
+    EntityRewriterBase(T protocol, EntityDataType displayNameMetaType, int displayNameIndex,
+                       EntityDataType displayVisibilityMetaType, int displayVisibilityIndex) {
+        super(protocol, false);
+        this.displayNameMetaType = displayNameMetaType;
+        this.displayNameIndex = displayNameIndex;
+        this.displayVisibilityMetaType = displayVisibilityMetaType;
+        this.displayVisibilityIndex = displayVisibilityIndex;
+    }
+
+    @Override
+    public void handleEntityData(int entityId, List<EntityData> entityDataList, UserConnection connection) {
+        final TrackedEntity entity = tracker(connection).entity(entityId);
+        final boolean initialMetadata = !(entity != null && entity.hasSentEntityData());
+
+        super.handleEntityData(entityId, entityDataList, connection);
+
+        if (entity == null) {
+            return; // Don't handle untracked entities - basically always the fault of a plugin sending virtual entities through concurrency-unsafe handling
+        }
+
+        // Set the mapped entity name if there is no custom name set already
+        final EntityReplacement entityMapping = entityDataForType(entity.entityType());
+        final Object displayNameObject;
+        if (entityMapping != null && (displayNameObject = entityMapping.entityName()) != null) {
+            final EntityData displayName = getData(displayNameIndex, entityDataList);
+            if (initialMetadata) {
+                if (displayName == null) {
+                    // Add it as new metadata
+                    entityDataList.add(new EntityData(displayNameIndex, displayNameMetaType, displayNameObject));
+                    addDisplayVisibilityMeta(entityDataList);
+                } else if (displayName.getValue() == null || displayName.getValue().toString().isEmpty()) {
+                    // Overwrite the existing null/empty display name
+                    displayName.setValue(displayNameObject);
+                    addDisplayVisibilityMeta(entityDataList);
+                }
+            } else if (displayName != null && (displayName.getValue() == null || displayName.getValue().toString().isEmpty())) {
+                // Overwrite null/empty display name
+                displayName.setValue(displayNameObject);
+                addDisplayVisibilityMeta(entityDataList);
+            }
+        }
+
+        // Add any other extra meta for mapped entities
+        if (entityMapping != null && entityMapping.hasBaseMeta() && initialMetadata) {
+            entityMapping.defaultMeta().createMeta(new WrappedMetadata(entityDataList));
+        }
+    }
+
+    private void addDisplayVisibilityMeta(List<EntityData> metadataList) {
+        if (alwaysShowOriginalMobName()) {
+            removeMeta(displayVisibilityIndex, metadataList);
+            metadataList.add(new EntityData(displayVisibilityIndex, displayVisibilityMetaType, getDisplayVisibilityMetaValue()));
+        }
+    }
+
+    protected Object getDisplayVisibilityMetaValue() {
+        return true;
+    }
+
+    protected boolean alwaysShowOriginalMobName() {
+        return ViaBackwards.getConfig().alwaysShowOriginalMobName();
+    }
+
+    protected @Nullable EntityData getData(int metaIndex, List<EntityData> metadataList) {
+        for (EntityData metadata : metadataList) {
+            if (metadata.id() == metaIndex) {
+                return metadata;
+            }
+        }
+        return null;
+    }
+
+    protected void removeMeta(int metaIndex, List<EntityData> metadataList) {
+        metadataList.removeIf(meta -> meta.id() == metaIndex);
+    }
+
+    protected boolean hasData(EntityType type) {
+        return entityDataMappings.containsKey(type.getId());
+    }
+
+    protected @Nullable EntityReplacement entityDataForType(EntityType type) {
+        return entityDataMappings.get(type.getId());
+    }
+
+    protected @Nullable StoredEntityData storedEntityData(EntityDataHandlerEvent event) {
+        return tracker(event.user()).entityData(event.entityId());
+    }
+
+    /**
+     * Maps an entity type to another with extra data.
+     * Note that both types should be of the same version.
+     *
+     * @param type       entity type
+     * @param mappedType mapped entity type
+     * @return created entity data
+     * @see #mapEntityType(EntityType, EntityType) for id only rewriting
+     */
+    protected EntityReplacement mapEntityTypeWithData(EntityType type, EntityType mappedType) {
+        Preconditions.checkArgument(type.getClass() == mappedType.getClass(), "Both entity types need to be of the same class");
+
+        // Already rewrite the id here
+        int mappedReplacementId = newEntityId(mappedType.getId());
+        EntityReplacement data = new EntityReplacement(protocol, type, mappedReplacementId);
+        mapEntityType(type.getId(), mappedReplacementId);
+        entityDataMappings.put(type.getId(), data);
+        return data;
+    }
+
+    public void registerMetaTypeHandler(
+        @Nullable EntityDataType itemType,
+        @Nullable EntityDataType blockStateType,
+        @Nullable EntityDataType optionalBlockStateType,
+        @Nullable EntityDataType particleType,
+        @Nullable EntityDataType componentType,
+        @Nullable EntityDataType optionalComponentType
+    ) {
+        filter().handler((event, meta) -> {
+            EntityDataType type = meta.dataType();
+            if (type == itemType) {
+                protocol.getItemRewriter().handleItemToClient(event.user(), meta.value());
+            } else if (type == blockStateType) {
+                int data = meta.value();
+                meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+            } else if (type == optionalBlockStateType) {
+                int data = meta.value();
+                if (data != 0) {
+                    meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+                }
+            } else if (type == particleType) {
+                rewriteParticle(event.user(), meta.value());
+            } else if (type == optionalComponentType || type == componentType) {
+                JsonElement text = meta.value();
+                protocol.getComponentRewriter().processText(event.user(), text);
+            }
+        });
+    }
+
+    public void registerMetaTypeHandler1_20_3(
+        @Nullable EntityDataType itemType,
+        @Nullable EntityDataType blockStateType,
+        @Nullable EntityDataType optionalBlockStateType,
+        @Nullable EntityDataType particleType,
+        @Nullable EntityDataType particlesType,
+        @Nullable EntityDataType componentType,
+        @Nullable EntityDataType optionalComponentType
+    ) {
+        filter().handler((event, meta) -> {
+            EntityDataType type = meta.dataType();
+            if (type == itemType) {
+                meta.setValue(protocol.getItemRewriter().handleItemToClient(event.user(), meta.value()));
+            } else if (type == blockStateType) {
+                int data = meta.value();
+                meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+            } else if (type == optionalBlockStateType) {
+                int data = meta.value();
+                if (data != 0) {
+                    meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+                }
+            } else if (type == particleType) {
+                rewriteParticle(event.user(), meta.value());
+            } else if (type == particlesType) {
+                Particle[] particles = meta.value();
+                for (final Particle particle : particles) {
+                    rewriteParticle(event.user(), particle);
+                }
+            } else if (type == optionalComponentType || type == componentType) {
+                protocol.getComponentRewriter().processTag(event.user(), meta.value());
+            }
+        });
+    }
+
+    // ONLY TRACKS, DOESN'T REWRITE IDS
+    protected PacketHandler getTrackerHandler(Type<? extends Number> intType, int typeIndex) {
+        return wrapper -> {
+            Number id = wrapper.get(intType, typeIndex);
+            tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), typeFromId(id.intValue()));
+        };
+    }
+
+    protected PacketHandler getTrackerHandler() {
+        return getTrackerHandler(Types.VAR_INT, 1);
+    }
+
+    protected PacketHandler getTrackerHandler(EntityType entityType, Type<? extends Number> intType) {
+        return wrapper -> tracker(wrapper.user()).addEntity((int) wrapper.get(intType, 0), entityType);
+    }
+
+    protected PacketHandler getDimensionHandler(int index) {
+        return wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+            int dimensionId = wrapper.get(Types.INT, index);
+            clientWorld.setEnvironment(dimensionId);
+        };
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyBlockItemRewriter.java

@@ -0,0 +1,389 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.MappedLegacyBlockItem;
+import com.viaversion.viabackwards.api.data.BackwardsMappingDataLoader;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.data.BlockColors1_11_1;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
+import com.viaversion.viaversion.api.minecraft.chunks.DataPalette;
+import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
+import com.viaversion.nbt.tag.ByteTag;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.ShortTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import com.viaversion.viaversion.util.IdAndData;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class LegacyBlockItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends BackwardsItemRewriterBase<C, S, T> {
+
+    protected final Int2ObjectMap<MappedLegacyBlockItem> itemReplacements = new Int2ObjectOpenHashMap<>(8); // Raw id -> mapped data
+    protected final Int2ObjectMap<MappedLegacyBlockItem> blockReplacements = new Int2ObjectOpenHashMap<>(8); // Raw id -> mapped data
+
+    protected LegacyBlockItemRewriter(T protocol, String name, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType, false);
+
+        Int2ObjectMap<MappedLegacyBlockItem> blockItemReplacements = new Int2ObjectOpenHashMap<>(8);
+        final JsonObject jsonObject = readMappingsFile("item-mappings-" + name + ".json");
+        addMappings(MappedLegacyBlockItem.Type.ITEM, jsonObject, itemReplacements);
+        addMappings(MappedLegacyBlockItem.Type.BLOCK_ITEM, jsonObject, blockItemReplacements);
+        addMappings(MappedLegacyBlockItem.Type.BLOCK, jsonObject, blockReplacements);
+
+        blockReplacements.putAll(blockItemReplacements);
+        itemReplacements.putAll(blockItemReplacements);
+    }
+
+    protected LegacyBlockItemRewriter(T protocol, String name, Type<Item> itemType, Type<Item[]> itemArrayType) {
+        this(protocol, name, itemType, itemArrayType, itemType, itemArrayType);
+    }
+
+    protected LegacyBlockItemRewriter(T protocol, String name) {
+        this(protocol, name, Types.ITEM1_8, Types.ITEM1_8_SHORT_ARRAY);
+    }
+
+    private void addMappings(MappedLegacyBlockItem.Type type, JsonObject object, Int2ObjectMap<MappedLegacyBlockItem> mappings) {
+        if (object.has(type.getName())) {
+            final JsonObject mappingsObject = object.getAsJsonObject(type.getName());
+            for (Map.Entry<String, JsonElement> dataEntry : mappingsObject.entrySet()) {
+                addMapping(dataEntry.getKey(), dataEntry.getValue().getAsJsonObject(), type, mappings);
+            }
+        }
+    }
+
+    private void addMapping(String key, JsonObject object, MappedLegacyBlockItem.Type type, Int2ObjectMap<MappedLegacyBlockItem> mappings) {
+        int id = object.getAsJsonPrimitive("id").getAsInt();
+        JsonPrimitive jsonData = object.getAsJsonPrimitive("data");
+        short data = jsonData != null ? jsonData.getAsShort() : 0;
+        String name = type != MappedLegacyBlockItem.Type.BLOCK ? object.getAsJsonPrimitive("name").getAsString() : null;
+
+        if (key.indexOf('-') == -1) {
+            int unmappedId;
+            int dataSeparatorIndex = key.indexOf(':');
+            if (dataSeparatorIndex != -1) {
+                // Include data
+                short unmappedData = Short.parseShort(key.substring(dataSeparatorIndex + 1));
+                unmappedId = Integer.parseInt(key.substring(0, dataSeparatorIndex));
+                unmappedId = IdAndData.toRawData(unmappedId, unmappedData);
+            } else {
+                unmappedId = IdAndData.toRawData(Integer.parseInt(key), -1);
+            }
+
+            mappings.put(unmappedId, new MappedLegacyBlockItem(id, data, name, type));
+            return;
+        }
+
+        // Range of ids
+        String[] split = key.split("-", 2);
+        int from = Integer.parseInt(split[0]);
+        int to = Integer.parseInt(split[1]);
+
+        // Special block color handling
+        if (name != null && name.contains("%color%")) {
+            for (int i = from; i <= to; i++) {
+                mappings.put(IdAndData.toRawData(i, -1), new MappedLegacyBlockItem(id, data, name.replace("%color%", BlockColors1_11_1.get(i - from)), type));
+            }
+        } else {
+            MappedLegacyBlockItem mappedBlockItem = new MappedLegacyBlockItem(id, data, name, type);
+            for (int i = from; i <= to; i++) {
+                mappings.put(IdAndData.toRawData(i, -1), mappedBlockItem);
+            }
+        }
+    }
+
+    public void registerBlockChange(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.BLOCK_POSITION1_8); // 0 - Block Position
+                map(Types.VAR_INT); // 1 - Block
+
+                handler(wrapper -> {
+                    int idx = wrapper.get(Types.VAR_INT, 0);
+                    wrapper.set(Types.VAR_INT, 0, handleBlockId(idx));
+                });
+            }
+        });
+    }
+
+    public void registerMultiBlockChange(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT); // 0 - Chunk X
+                map(Types.INT); // 1 - Chunk Z
+                map(Types.BLOCK_CHANGE_ARRAY);
+
+                handler(wrapper -> {
+                    for (BlockChangeRecord record : wrapper.get(Types.BLOCK_CHANGE_ARRAY, 0)) {
+                        record.setBlockId(handleBlockId(record.getBlockId()));
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(UserConnection connection, @Nullable Item item) {
+        if (item == null) return null;
+
+        MappedLegacyBlockItem data = getMappedItem(item.identifier(), item.data());
+        if (data == null) {
+            // Just rewrite the id
+            return super.handleItemToClient(connection, item);
+        }
+        if (item.tag() == null) {
+            item.setTag(new CompoundTag());
+        }
+
+        short originalData = item.data();
+        item.tag().putInt(nbtTagName("id"), item.identifier());
+        item.setIdentifier(data.getId());
+        // Keep original data if mapped data is set to -1
+        if (data.getData() != -1) {
+            item.setData(data.getData());
+            item.tag().putShort(nbtTagName("data"), originalData);
+        }
+
+        // Set display name
+        if (data.getName() != null) {
+            CompoundTag display = item.tag().getCompoundTag("display");
+            if (display == null) {
+                item.tag().put("display", display = new CompoundTag());
+            }
+
+            StringTag nameTag = display.getStringTag("Name");
+            if (nameTag == null) {
+                nameTag = new StringTag(data.getName());
+                display.put("Name", nameTag);
+                display.put(nbtTagName("customName"), new ByteTag(false));
+            }
+
+            // Handle colors
+            String value = nameTag.getValue();
+            if (value.contains("%vb_color%")) {
+                display.putString("Name", value.replace("%vb_color%", BlockColors1_11_1.get(originalData)));
+            }
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, @Nullable final Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+        if (item.tag() != null) {
+            Tag originalId = item.tag().remove(nbtTagName("id"));
+            if (originalId instanceof IntTag) {
+                item.setIdentifier(((NumberTag) originalId).asInt());
+            }
+            Tag originalData = item.tag().remove(nbtTagName("data"));
+            if (originalData instanceof ShortTag) {
+                item.setData(((NumberTag) originalData).asShort());
+            }
+        }
+        return item;
+    }
+
+    public PacketHandler getFallingBlockHandler() {
+        return wrapper -> {
+            final EntityTypes1_12.ObjectType type = EntityTypes1_12.ObjectType.findById(wrapper.get(Types.BYTE, 0));
+            if (type == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
+                final int objectData = wrapper.get(Types.INT, 0);
+
+                final IdAndData block = handleBlock(objectData & 4095, objectData >> 12 & 15);
+                if (block == null) return;
+
+                wrapper.set(Types.INT, 0, block.getId() | block.getData() << 12);
+            }
+        };
+    }
+
+    public @Nullable IdAndData handleBlock(int blockId, int data) {
+        MappedLegacyBlockItem settings = getMappedBlock(blockId, data);
+        if (settings == null) {
+            return null;
+        }
+
+        IdAndData block = settings.getBlock();
+        // For some blocks, the data can still be useful (:
+        if (block.getData() == -1) {
+            return block.withData(data);
+        }
+        return block;
+    }
+
+    public int handleBlockId(final int rawId) {
+        final int id = IdAndData.getId(rawId);
+        final int data = IdAndData.getData(rawId);
+
+        final IdAndData mappedBlock = handleBlock(id, data);
+        if (mappedBlock == null) return rawId;
+
+        return IdAndData.toRawData(mappedBlock.getId(), mappedBlock.getData());
+    }
+
+    public void handleChunk(Chunk chunk) {
+        // Map Block Entities
+        Map<Pos, CompoundTag> tags = new HashMap<>();
+        for (CompoundTag tag : chunk.getBlockEntities()) {
+            NumberTag xTag;
+            NumberTag yTag;
+            NumberTag zTag;
+            if ((xTag = tag.getNumberTag("x")) == null
+                || (yTag = tag.getNumberTag("y")) == null
+                || (zTag = tag.getNumberTag("z")) == null) {
+                continue;
+            }
+
+            Pos pos = new Pos(xTag.asInt() & 0xF, yTag.asInt(), zTag.asInt() & 0xF);
+            tags.put(pos, tag);
+
+            // Handle given Block Entities
+            if (pos.y() < 0 || pos.y() > 255) continue; // 1.17
+
+            ChunkSection section = chunk.getSections()[pos.y() >> 4];
+            if (section == null) continue;
+
+            int block = section.palette(PaletteType.BLOCKS).idAt(pos.x(), pos.y() & 0xF, pos.z());
+
+            MappedLegacyBlockItem settings = getMappedBlock(block);
+            if (settings != null && settings.hasBlockEntityHandler()) {
+                settings.getBlockEntityHandler().handleOrNewCompoundTag(block, tag);
+            }
+        }
+
+        for (int i = 0; i < chunk.getSections().length; i++) {
+            ChunkSection section = chunk.getSections()[i];
+            if (section == null) {
+                continue;
+            }
+
+            boolean hasBlockEntityHandler = false;
+
+            // Map blocks
+            DataPalette palette = section.palette(PaletteType.BLOCKS);
+            for (int j = 0; j < palette.size(); j++) {
+                int block = palette.idByIndex(j);
+                int btype = block >> 4;
+                int meta = block & 0xF;
+
+                IdAndData b = handleBlock(btype, meta);
+                if (b != null) {
+                    palette.setIdByIndex(j, IdAndData.toRawData(b.getId(), b.getData()));
+                }
+
+                // We already know that is has a handler
+                if (hasBlockEntityHandler) continue;
+
+                MappedLegacyBlockItem settings = getMappedBlock(block);
+                if (settings != null && settings.hasBlockEntityHandler()) {
+                    hasBlockEntityHandler = true;
+                }
+            }
+
+            if (!hasBlockEntityHandler) continue;
+
+            // We need to handle a Block Entity :(
+            for (int x = 0; x < 16; x++) {
+                for (int y = 0; y < 16; y++) {
+                    for (int z = 0; z < 16; z++) {
+                        int block = palette.idAt(x, y, z);
+
+                        MappedLegacyBlockItem settings = getMappedBlock(block);
+                        if (settings == null || !settings.hasBlockEntityHandler()) continue;
+
+                        Pos pos = new Pos(x, (y + (i << 4)), z);
+
+                        // Already handled above
+                        if (tags.containsKey(pos)) continue;
+
+                        CompoundTag tag = new CompoundTag();
+                        tag.putInt("x", x + (chunk.getX() << 4));
+                        tag.putInt("y", y + (i << 4));
+                        tag.putInt("z", z + (chunk.getZ() << 4));
+
+                        settings.getBlockEntityHandler().handleOrNewCompoundTag(block, tag);
+                        chunk.getBlockEntities().add(tag);
+                    }
+                }
+            }
+        }
+    }
+
+    protected CompoundTag getNamedTag(String text) {
+        CompoundTag tag = new CompoundTag();
+        CompoundTag displayTag = new CompoundTag();
+        tag.put("display", displayTag);
+        text = "§r" + text;
+        displayTag.putString("Name", jsonNameFormat ? ComponentUtil.legacyToJsonString(text) : text);
+        return tag;
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedBlock(int id, int data) {
+        MappedLegacyBlockItem mapping = blockReplacements.get(IdAndData.toRawData(id, data));
+        return mapping != null ? mapping : blockReplacements.get(IdAndData.toRawData(id, -1));
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedItem(int id, int data) {
+        MappedLegacyBlockItem mapping = itemReplacements.get(IdAndData.toRawData(id, data));
+        return mapping != null ? mapping : itemReplacements.get(IdAndData.toRawData(id, -1));
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedBlock(int rawId) {
+        int id = IdAndData.getId(rawId);
+        int data = IdAndData.getData(rawId);
+        return getMappedBlock(id, data);
+    }
+
+    protected JsonObject readMappingsFile(final String name) {
+        return BackwardsMappingDataLoader.INSTANCE.loadFromDataDir(name);
+    }
+
+    private record Pos(int x, short y, int z) {
+
+        public Pos(int x, int y, int z) {
+            this(x, (short) y, z);
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyEnchantmentRewriter.java

@@ -0,0 +1,191 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.nbt.tag.ByteTag;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class LegacyEnchantmentRewriter {
+
+    private final Map<Short, String> enchantmentMappings = new HashMap<>();
+    private final String nbtTagName;
+    private final boolean dummyEnchantment;
+
+    private Set<Short> hideLevelForEnchants;
+
+    public LegacyEnchantmentRewriter(String nbtTagName) {
+        this(nbtTagName, true);
+    }
+
+    public LegacyEnchantmentRewriter(String nbtTagName, boolean dummyEnchantment) {
+        this.nbtTagName = nbtTagName;
+        this.dummyEnchantment = dummyEnchantment;
+    }
+
+    public void registerEnchantment(int id, String replacementLore) {
+        enchantmentMappings.put((short) id, replacementLore);
+    }
+
+    public void handleToClient(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.getListTag("ench") != null) {
+            rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.getListTag("StoredEnchantments") != null) {
+            rewriteEnchantmentsToClient(tag, true);
+        }
+    }
+
+    public void handleToServer(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.getListTag(nbtTagName + "|ench", CompoundTag.class) != null) {
+            rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.getListTag(nbtTagName + "|StoredEnchantments", CompoundTag.class) != null) {
+            rewriteEnchantmentsToServer(tag, true);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "ench";
+        ListTag<CompoundTag> enchantments = tag.getListTag(key, CompoundTag.class);
+        ListTag<CompoundTag> remappedEnchantments = new ListTag<>(CompoundTag.class);
+        List<StringTag> lore = new ArrayList<>();
+        for (CompoundTag enchantmentEntry : enchantments.copy()) {
+            NumberTag idTag = enchantmentEntry.getNumberTag("id");
+            if (idTag == null) continue;
+
+            short newId = idTag.asShort();
+            String enchantmentName = enchantmentMappings.get(newId);
+            if (enchantmentName != null) {
+                enchantments.remove(enchantmentEntry);
+                NumberTag levelTag = enchantmentEntry.getNumberTag("lvl");
+                short level = levelTag != null ? levelTag.asShort() : 1;
+                if (hideLevelForEnchants != null && hideLevelForEnchants.contains(newId)) {
+                    lore.add(new StringTag(enchantmentName));
+                } else {
+                    lore.add(new StringTag(enchantmentName + " " + EnchantmentRewriter.getRomanNumber(level)));
+                }
+                remappedEnchantments.add(enchantmentEntry);
+            }
+        }
+        if (!lore.isEmpty()) {
+            if (this.dummyEnchantment && !storedEnchant && enchantments.isEmpty()) {
+                CompoundTag dummyEnchantment = new CompoundTag();
+                dummyEnchantment.putShort("id", (short) 0);
+                dummyEnchantment.putShort("lvl", (short) 0);
+
+                enchantments.add(dummyEnchantment);
+                tag.put(nbtTagName + "|dummyEnchant", new ByteTag(false));
+
+                NumberTag hideFlags = tag.getNumberTag("HideFlags");
+                if (hideFlags == null) {
+                    hideFlags = new IntTag();
+                } else {
+                    tag.putInt(nbtTagName + "|oldHideFlags", hideFlags.asByte());
+                }
+
+                int flags = hideFlags.asByte() | 1;
+                tag.putInt("HideFlags", flags);
+            }
+
+            tag.put(nbtTagName + "|" + key, remappedEnchantments);
+
+            CompoundTag display = tag.getCompoundTag("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+            ListTag<StringTag> loreTag = display.getListTag("Lore", StringTag.class);
+            if (loreTag == null) {
+                display.put("Lore", loreTag = new ListTag<>(StringTag.class));
+            }
+
+            lore.addAll(loreTag.getValue());
+            loreTag.setValue(lore);
+        }
+    }
+
+    public void rewriteEnchantmentsToServer(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "ench";
+        ListTag<CompoundTag> enchantments = tag.getListTag(key, CompoundTag.class);
+        if (enchantments == null) {
+            enchantments = new ListTag<>(CompoundTag.class);
+        }
+
+        if (!storedEnchant && tag.remove(nbtTagName + "|dummyEnchant") != null) {
+            for (CompoundTag enchantment : enchantments.copy()) {
+                NumberTag idTag = enchantment.getNumberTag("id");
+                NumberTag levelTag = enchantment.getNumberTag("lvl");
+                short id = idTag != null ? idTag.asShort() : 0;
+                short level = levelTag != null ? levelTag.asShort() : 0;
+                if (id == 0 && level == 0) {
+                    enchantments.remove(enchantment);
+                }
+            }
+
+            Tag hideFlags = tag.remove(nbtTagName + "|oldHideFlags");
+            if (hideFlags instanceof IntTag intTag) {
+                tag.putInt("HideFlags", intTag.asByte());
+            } else {
+                tag.remove("HideFlags");
+            }
+        }
+
+        CompoundTag display = tag.getCompoundTag("display");
+        // A few null checks just to be safe, though they shouldn't actually be
+        ListTag<StringTag> lore = display != null ? display.getListTag("Lore", StringTag.class) : null;
+        ListTag<CompoundTag> remappedEnchantments = (ListTag<CompoundTag>) tag.remove(nbtTagName + "|" + key);
+        for (CompoundTag enchantment : remappedEnchantments.copy()) {
+            enchantments.add(enchantment);
+            if (lore != null && !lore.isEmpty()) {
+                lore.remove(lore.get(0));
+            }
+        }
+        if (lore != null && lore.isEmpty()) {
+            display.remove("Lore");
+            if (display.isEmpty()) {
+                tag.remove("display");
+            }
+        }
+
+        tag.put(key, enchantments);
+    }
+
+    public void setHideLevelForEnchants(int... enchants) {
+        this.hideLevelForEnchants = new HashSet<>();
+        for (int enchant : enchants) {
+            hideLevelForEnchants.add((short) enchant);
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyEntityRewriter.java

@@ -0,0 +1,182 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.entities.storage.EntityReplacement;
+import com.viaversion.viabackwards.api.entities.storage.EntityObjectData;
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.ObjectType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_9;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class LegacyEntityRewriter<C extends ClientboundPacketType, T extends BackwardsProtocol<C, ?, ?, ?>> extends EntityRewriterBase<C, T> {
+    private final Map<ObjectType, EntityReplacement> objectTypes = new HashMap<>();
+
+    protected LegacyEntityRewriter(T protocol) {
+        this(protocol, EntityDataTypes1_9.STRING, EntityDataTypes1_9.BOOLEAN);
+    }
+
+    protected LegacyEntityRewriter(T protocol, EntityDataType displayType, EntityDataType displayVisibilityType) {
+        super(protocol, displayType, 2, displayVisibilityType, 3);
+    }
+
+    protected EntityObjectData mapObjectType(ObjectType oldObjectType, ObjectType replacement, int data) {
+        EntityObjectData entData = new EntityObjectData(protocol, oldObjectType.getType().name(), oldObjectType.getId(), replacement.getId(), data);
+        objectTypes.put(oldObjectType, entData);
+        return entData;
+    }
+
+    protected @Nullable EntityReplacement getObjectData(ObjectType type) {
+        return objectTypes.get(type);
+    }
+
+    protected void registerRespawn(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT);
+                handler(wrapper -> {
+                    ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+                    clientWorld.setEnvironment(wrapper.get(Types.INT, 0));
+                });
+            }
+        });
+    }
+
+    protected void registerJoinGame(C packetType, EntityType playerType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT); // 0 - Entity ID
+                map(Types.UNSIGNED_BYTE); // 1 - Gamemode
+                map(Types.INT); // 2 - Dimension
+                handler(wrapper -> {
+                    ClientWorld clientChunks = wrapper.user().get(ClientWorld.class);
+                    clientChunks.setEnvironment(wrapper.get(Types.INT, 1));
+                    addTrackedEntity(wrapper, wrapper.get(Types.INT, 0), playerType);
+                });
+            }
+        });
+    }
+
+    @Override
+    public void registerSetEntityData(C packetType, Type<List<EntityData>> oldMetaType, Type<List<EntityData>> newMetaType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                if (oldMetaType != null) {
+                    map(oldMetaType, newMetaType);
+                } else {
+                    map(newMetaType);
+                }
+                handler(wrapper -> {
+                    List<EntityData> metadata = wrapper.get(newMetaType, 0);
+                    handleEntityData(wrapper.get(Types.VAR_INT, 0), metadata, wrapper.user());
+                });
+            }
+        });
+    }
+
+    @Override
+    public void registerSetEntityData(C packetType, Type<List<EntityData>> metaType) {
+        registerSetEntityData(packetType, null, metaType);
+    }
+
+    protected PacketHandler getMobSpawnRewriter(Type<List<EntityData>> metaType, IdSetter idSetter) {
+        return wrapper -> {
+            int entityId = wrapper.get(Types.VAR_INT, 0);
+            EntityType type = tracker(wrapper.user()).entityType(entityId);
+
+            List<EntityData> metadata = wrapper.get(metaType, 0);
+            handleEntityData(entityId, metadata, wrapper.user());
+
+            EntityReplacement entityReplacement = entityDataForType(type);
+            if (entityReplacement != null) {
+                idSetter.setId(wrapper, entityReplacement.replacementId());
+                if (entityReplacement.hasBaseMeta()) {
+                    entityReplacement.defaultMeta().createMeta(new WrappedMetadata(metadata));
+                }
+            }
+        };
+    }
+
+    public PacketHandler getMobSpawnRewriter(Type<List<EntityData>> metaType) {
+        return getMobSpawnRewriter(metaType, (wrapper, id) -> wrapper.set(Types.UNSIGNED_BYTE, 0, (short) id));
+    }
+
+    public PacketHandler getMobSpawnRewriter1_11(Type<List<EntityData>> metaType) {
+        return getMobSpawnRewriter(metaType, (wrapper, id) -> wrapper.set(Types.VAR_INT, 1, id));
+    }
+
+    protected PacketHandler getObjectTrackerHandler() {
+        return wrapper -> addTrackedEntity(wrapper, wrapper.get(Types.VAR_INT, 0), objectTypeFromId(wrapper.get(Types.BYTE, 0)));
+    }
+
+    protected PacketHandler getTrackerAndMetaHandler(Type<List<EntityData>> metaType, EntityType entityType) {
+        return wrapper -> {
+            addTrackedEntity(wrapper, wrapper.get(Types.VAR_INT, 0), entityType);
+            List<EntityData> metadata = wrapper.get(metaType, 0);
+            handleEntityData(wrapper.get(Types.VAR_INT, 0), metadata, wrapper.user());
+        };
+    }
+
+    protected PacketHandler getObjectRewriter(Function<Byte, ObjectType> objectGetter) {
+        return wrapper -> {
+            ObjectType type = objectGetter.apply(wrapper.get(Types.BYTE, 0));
+            if (type == null) {
+                protocol.getLogger().warning("Could not find Entity Type" + wrapper.get(Types.BYTE, 0));
+                return;
+            }
+
+            EntityReplacement data = getObjectData(type);
+            if (data != null) {
+                wrapper.set(Types.BYTE, 0, (byte) data.replacementId());
+                if (data.objectData() != -1) {
+                    wrapper.set(Types.INT, 0, data.objectData());
+                }
+            }
+        };
+    }
+
+    @Deprecated
+    protected void addTrackedEntity(PacketWrapper wrapper, int entityId, EntityType type) {
+        tracker(wrapper.user()).addEntity(entityId, type);
+    }
+
+    @FunctionalInterface
+    protected interface IdSetter {
+
+        void setId(PacketWrapper wrapper, int id);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacySoundRewriter.java

@@ -0,0 +1,79 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.rewriter.RewriterBase;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+
+@Deprecated
+public abstract class LegacySoundRewriter<T extends BackwardsProtocol<?, ?, ?, ?>> extends RewriterBase<T> {
+    protected final Int2ObjectMap<SoundData> soundRewrites = new Int2ObjectOpenHashMap<>(64);
+
+    protected LegacySoundRewriter(T protocol) {
+        super(protocol);
+    }
+
+    public SoundData added(int id, int replacement) {
+        return added(id, replacement, -1);
+    }
+
+    public SoundData added(int id, int replacement, float newPitch) {
+        SoundData data = new SoundData(replacement, true, newPitch, true);
+        soundRewrites.put(id, data);
+        return data;
+    }
+
+    public SoundData removed(int id) {
+        SoundData data = new SoundData(-1, false, -1, false);
+        soundRewrites.put(id, data);
+        return data;
+    }
+
+    public int handleSounds(int soundId) {
+        int newSoundId = soundId;
+        SoundData data = soundRewrites.get(soundId);
+        if (data != null) return data.replacementSound();
+
+        for (Int2ObjectMap.Entry<SoundData> entry : soundRewrites.int2ObjectEntrySet()) {
+            if (soundId > entry.getIntKey()) {
+                if (entry.getValue().added()) {
+                    newSoundId--;
+                } else {
+                    newSoundId++;
+                }
+            }
+        }
+        return newSoundId;
+    }
+
+    public boolean hasPitch(int soundId) {
+        SoundData data = soundRewrites.get(soundId);
+        return data != null && data.changePitch();
+    }
+
+    public float handlePitch(int soundId) {
+        SoundData data = soundRewrites.get(soundId);
+        return data != null ? data.newPitch() : 1F;
+    }
+
+    public record SoundData(int replacementSound, boolean changePitch, float newPitch, boolean added) {
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/MapColorRewriter.java

@@ -0,0 +1,60 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.rewriter.IdRewriteFunction;
+
+public final class MapColorRewriter {
+
+    /**
+     * Returns a packethandler to rewrite map data color ids. Reading starts from the icon count.
+     *
+     * @param rewriter id rewriter returning mapped colors, or -1 if unmapped
+     * @return packethandler to rewrite map data color ids
+     */
+    public static PacketHandler getRewriteHandler(IdRewriteFunction rewriter) {
+        return wrapper -> {
+            int iconCount = wrapper.passthrough(Types.VAR_INT);
+            for (int i = 0; i < iconCount; i++) {
+                wrapper.passthrough(Types.VAR_INT); // Type
+                wrapper.passthrough(Types.BYTE); // X
+                wrapper.passthrough(Types.BYTE); // Z
+                wrapper.passthrough(Types.BYTE); // Direction
+                wrapper.passthrough(Types.OPTIONAL_COMPONENT); // Display Name
+            }
+
+            short columns = wrapper.passthrough(Types.UNSIGNED_BYTE);
+            if (columns < 1) return;
+
+            wrapper.passthrough(Types.UNSIGNED_BYTE); // Rows
+            wrapper.passthrough(Types.UNSIGNED_BYTE); // X
+            wrapper.passthrough(Types.UNSIGNED_BYTE); // Z
+            byte[] data = wrapper.passthrough(Types.BYTE_ARRAY_PRIMITIVE);
+            for (int i = 0; i < data.length; i++) {
+                int color = data[i] & 0xFF;
+                int mappedColor = rewriter.rewrite(color);
+                if (mappedColor != -1) {
+                    data[i] = (byte) mappedColor;
+                }
+            }
+        };
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/SoundRewriter.java

@@ -0,0 +1,137 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.SoundEvent;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+
+public class SoundRewriter<C extends ClientboundPacketType> extends com.viaversion.viaversion.rewriter.SoundRewriter<C> {
+
+    private final BackwardsProtocol<C, ?, ?, ?> protocol;
+
+    public SoundRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol) {
+        super(protocol);
+        this.protocol = protocol;
+    }
+
+    public void registerNamedSound(final C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.STRING); // Sound identifier
+                handler(getNamedSoundHandler());
+            }
+        });
+    }
+
+    public void registerStopSound(final C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(getStopSoundHandler());
+            }
+        });
+    }
+
+    public PacketHandler getNamedSoundHandler() {
+        return wrapper -> {
+            final String soundId = wrapper.get(Types.STRING, 0);
+            final String mappedId = protocol.getMappingData().getMappedNamedSound(soundId);
+            if (mappedId == null) {
+                return;
+            }
+
+            if (!mappedId.isEmpty()) {
+                wrapper.set(Types.STRING, 0, mappedId);
+            } else {
+                wrapper.cancel();
+            }
+        };
+    }
+
+    public PacketHandler getStopSoundHandler() {
+        return wrapper -> {
+            final byte flags = wrapper.passthrough(Types.BYTE);
+            if ((flags & 0x02) == 0) return; // No sound specified
+
+            if ((flags & 0x01) != 0) {
+                wrapper.passthrough(Types.VAR_INT); // Source
+            }
+
+            final String soundId = wrapper.read(Types.STRING);
+            final String mappedId = protocol.getMappingData().getMappedNamedSound(soundId);
+            if (mappedId == null) {
+                // No mapping found
+                wrapper.write(Types.STRING, soundId);
+                return;
+            }
+
+            if (!mappedId.isEmpty()) {
+                wrapper.write(Types.STRING, mappedId);
+            } else {
+                // Cancel if set to empty
+                wrapper.cancel();
+            }
+        };
+    }
+
+    @Override
+    public void registerSound1_19_3(final C packetType) {
+        protocol.registerClientbound(packetType, getSoundHandler1_19_3());
+    }
+
+    public PacketHandler getSoundHandler1_19_3() {
+        return wrapper -> {
+            Holder<SoundEvent> soundEventHolder = wrapper.read(Types.SOUND_EVENT);
+            if (soundEventHolder.isDirect()) {
+                wrapper.write(Types.SOUND_EVENT, rewriteSoundEvent(wrapper, soundEventHolder));
+                return;
+            }
+
+            final int mappedId = idRewriter.rewrite(soundEventHolder.id());
+            if (mappedId == -1) {
+                wrapper.cancel();
+                return;
+            }
+
+            if (mappedId != soundEventHolder.id()) {
+                soundEventHolder = Holder.of(mappedId);
+            }
+
+            wrapper.write(Types.SOUND_EVENT, soundEventHolder);
+        };
+    }
+
+    public Holder<SoundEvent> rewriteSoundEvent(final PacketWrapper wrapper, final Holder<SoundEvent> soundEventHolder) {
+        final SoundEvent soundEvent = soundEventHolder.value();
+        final String mappedIdentifier = protocol.getMappingData().getMappedNamedSound(soundEvent.identifier());
+        if (mappedIdentifier != null) {
+            if (!mappedIdentifier.isEmpty()) {
+                return Holder.of(soundEvent.withIdentifier(mappedIdentifier));
+            }
+            wrapper.cancel();
+        }
+        return soundEventHolder;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/StructuredEnchantmentRewriter.java

@@ -0,0 +1,201 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.nbt.tag.ByteTag;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viaversion.api.data.Mappings;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.IntIntPair;
+import com.viaversion.viaversion.libs.fastutil.objects.ObjectIterator;
+import com.viaversion.viaversion.rewriter.IdRewriteFunction;
+import com.viaversion.viaversion.util.ComponentUtil;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class StructuredEnchantmentRewriter {
+
+    protected final BackwardsStructuredItemRewriter<?, ?, ?> itemRewriter;
+    private boolean rewriteIds = true;
+
+    public StructuredEnchantmentRewriter(final BackwardsStructuredItemRewriter<?, ?, ?> itemRewriter) {
+        this.itemRewriter = itemRewriter;
+    }
+
+    public void handleToClient(final Item item) {
+        final StructuredDataContainer data = item.dataContainer();
+        final BackwardsMappingData mappingData = itemRewriter.protocol().getMappingData();
+        final IdRewriteFunction idRewriteFunction = id -> {
+            final Mappings mappings = mappingData.getEnchantmentMappings();
+            return mappings.getNewId(id);
+        };
+        final DescriptionSupplier descriptionSupplier = (id, level) -> {
+            final String remappedName = mappingData.mappedEnchantmentName(id);
+            return ComponentUtil.jsonStringToTag(ComponentUtil.legacyToJsonString("§7" + remappedName + " " + EnchantmentRewriter.getRomanNumber(level), true));
+        };
+        rewriteEnchantmentsToClient(data, StructuredDataKey.ENCHANTMENTS, idRewriteFunction, descriptionSupplier, false);
+        rewriteEnchantmentsToClient(data, StructuredDataKey.STORED_ENCHANTMENTS, idRewriteFunction, descriptionSupplier, true);
+    }
+
+    public void handleToServer(final Item item) {
+        final StructuredDataContainer data = item.dataContainer();
+        final StructuredData<CompoundTag> customData = data.getNonEmpty(StructuredDataKey.CUSTOM_DATA);
+        if (customData == null) {
+            return;
+        }
+
+        final CompoundTag tag = customData.value();
+        rewriteEnchantmentsToServer(data, tag, StructuredDataKey.ENCHANTMENTS);
+        rewriteEnchantmentsToServer(data, tag, StructuredDataKey.STORED_ENCHANTMENTS);
+    }
+
+    public void rewriteEnchantmentsToClient(final StructuredDataContainer data, final StructuredDataKey<Enchantments> key, final IdRewriteFunction rewriteFunction, final DescriptionSupplier descriptionSupplier, final boolean storedEnchant) {
+        final StructuredData<Enchantments> enchantmentsData = data.getNonEmpty(key);
+        if (enchantmentsData == null) {
+            return;
+        }
+
+        final CompoundTag tag = data.computeIfAbsent(StructuredDataKey.CUSTOM_DATA, $ -> new CompoundTag()).value();
+        final Enchantments enchantments = enchantmentsData.value();
+        final List<Tag> loreToAdd = new ArrayList<>();
+        boolean changed = false;
+
+        final ObjectIterator<Int2IntMap.Entry> iterator = enchantments.enchantments().int2IntEntrySet().iterator();
+        final List<IntIntPair> updatedIds = new ArrayList<>();
+        while (iterator.hasNext()) {
+            final Int2IntMap.Entry entry = iterator.next();
+            final int id = entry.getIntKey();
+            final int mappedId = rewriteFunction.rewrite(id);
+            if (mappedId != -1) {
+                if (rewriteIds) {
+                    // Update the map after to iteration to preserve the current ids before possibly saving the original, avoid CME
+                    updatedIds.add(IntIntPair.of(id, mappedId));
+                }
+                continue;
+            }
+
+            final int level = entry.getIntValue();
+            final Tag description = descriptionSupplier.get(id, level);
+            if (description != null) {
+                if (!changed) {
+                    // Backup original before doing modifications
+                    itemRewriter.saveListTag(tag, asTag(enchantments), key.identifier());
+                    changed = true;
+                }
+
+                loreToAdd.add(description);
+                iterator.remove();
+            }
+        }
+
+        for (final IntIntPair pair : updatedIds) {
+            final int level = enchantments.enchantments().remove(pair.firstInt());
+            enchantments.add(pair.secondInt(), level);
+        }
+
+        if (loreToAdd.isEmpty()) {
+            // No removed enchantments
+            return;
+        }
+
+        // Add glint override if there are no enchantments left
+        if (!storedEnchant && enchantments.size() == 0) {
+            final StructuredData<Boolean> glintOverride = data.getNonEmpty(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE);
+            if (glintOverride != null) {
+                tag.putBoolean(itemRewriter.nbtTagName("glint"), glintOverride.value());
+            } else {
+                tag.putBoolean(itemRewriter.nbtTagName("noglint"), true);
+            }
+            data.set(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE, true);
+        }
+
+        // Save original lore
+        final StructuredData<Tag[]> loreData = data.getNonEmpty(StructuredDataKey.LORE);
+        if (loreData != null) {
+            final List<Tag> loreList = Arrays.asList(loreData.value());
+            itemRewriter.saveGenericTagList(tag, loreList, "lore");
+            loreToAdd.addAll(loreList);
+        } else {
+            tag.putBoolean(itemRewriter.nbtTagName("nolore"), true);
+        }
+
+        if (enchantments.showInTooltip()) {
+            tag.putBoolean(itemRewriter.nbtTagName("show_" + key.identifier()), true);
+        }
+
+        data.set(StructuredDataKey.LORE, loreToAdd.toArray(new Tag[0]));
+    }
+
+    private ListTag<CompoundTag> asTag(final Enchantments enchantments) {
+        final ListTag<CompoundTag> listTag = new ListTag<>(CompoundTag.class);
+        for (final Int2IntMap.Entry entry : enchantments.enchantments().int2IntEntrySet()) {
+            final CompoundTag enchantment = new CompoundTag();
+            enchantment.putInt("id", entry.getIntKey());
+            enchantment.putInt("lvl", entry.getIntValue());
+            listTag.add(enchantment);
+        }
+        return listTag;
+    }
+
+    public void rewriteEnchantmentsToServer(final StructuredDataContainer data, final CompoundTag tag, final StructuredDataKey<Enchantments> key) {
+        final ListTag<CompoundTag> enchantmentsTag = itemRewriter.removeListTag(tag, key.identifier(), CompoundTag.class);
+        if (enchantmentsTag == null) {
+            return;
+        }
+
+        final Tag glintTag = tag.remove(itemRewriter.nbtTagName("glint"));
+        if (glintTag instanceof ByteTag) {
+            data.set(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE, ((NumberTag) glintTag).asBoolean());
+        } else if (tag.remove(itemRewriter.nbtTagName("noglint")) != null) {
+            data.remove(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE);
+        }
+
+        final List<Tag> lore = itemRewriter.removeGenericTagList(tag, "lore");
+        if (lore != null) {
+            data.set(StructuredDataKey.LORE, lore.toArray(new Tag[0]));
+        } else if (tag.remove(itemRewriter.nbtTagName("nolore")) != null) {
+            data.remove(StructuredDataKey.LORE);
+        }
+
+        final Enchantments enchantments = new Enchantments(tag.remove(itemRewriter.nbtTagName("show_" + key.identifier())) != null);
+        for (final CompoundTag enchantment : enchantmentsTag) {
+            enchantments.add(enchantment.getInt("id"), enchantment.getInt("lvl"));
+        }
+        data.set(key, enchantments);
+    }
+
+    public void setRewriteIds(final boolean rewriteIds) {
+        this.rewriteIds = rewriteIds;
+    }
+
+    @FunctionalInterface
+    public interface DescriptionSupplier {
+
+        Tag get(int id, int level);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/TranslatableRewriter.java

@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingDataLoader;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import java.util.HashMap;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class TranslatableRewriter<C extends ClientboundPacketType> extends ComponentRewriter<C> {
+
+    private static final Map<String, Map<String, String>> TRANSLATABLES = new HashMap<>();
+    private final Map<String, String> translatables;
+
+    public static void loadTranslatables() {
+        if (!TRANSLATABLES.isEmpty()) {
+            throw new IllegalStateException("Translatables already loaded!");
+        }
+        fillTranslatables(BackwardsMappingDataLoader.INSTANCE.loadFromDataDir("translation-mappings.json"), TRANSLATABLES);
+    }
+
+    public static void fillTranslatables(final JsonObject jsonObject, final Map<String, Map<String, String>> translatables) {
+        for (final Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
+            final Map<String, String> versionMappings = new HashMap<>();
+            translatables.put(entry.getKey(), versionMappings);
+            for (final Map.Entry<String, JsonElement> translationEntry : entry.getValue().getAsJsonObject().entrySet()) {
+                versionMappings.put(translationEntry.getKey(), translationEntry.getValue().getAsString());
+            }
+        }
+    }
+
+    public TranslatableRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final ReadType type) {
+        this(protocol, type, protocol.getClass().getSimpleName().replace("Protocol", "").split("To")[0].replace("_", "."));
+    }
+
+    public TranslatableRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final ReadType type, final String version) {
+        super(protocol, type);
+        final Map<String, String> translatableMappings = getTranslatableMappings(version);
+        if (translatableMappings == null) {
+            protocol.getLogger().warning("Missing " + version + " translatables!");
+            this.translatables = new HashMap<>();
+        } else {
+            this.translatables = translatableMappings;
+        }
+    }
+
+    @Override
+    protected void handleTranslate(final JsonObject root, final String translate) {
+        final String newTranslate = mappedTranslationKey(translate);
+        if (newTranslate != null) {
+            root.addProperty("translate", newTranslate);
+        }
+    }
+
+    @Override
+    protected void handleTranslate(final UserConnection connection, final CompoundTag parentTag, final StringTag translateTag) {
+        final String newTranslate = mappedTranslationKey(translateTag.getValue());
+        if (newTranslate != null) {
+            parentTag.put("translate", new StringTag(newTranslate));
+        }
+    }
+
+    public @Nullable String mappedTranslationKey(final String translationKey) {
+        return translatables.get(translationKey);
+    }
+
+    public Map<String, String> getTranslatableMappings(final String sectionIdentifier) {
+        return TRANSLATABLES.get(sectionIdentifier);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_10to1_9_3/Protocol1_10To1_9_3.java

@@ -0,0 +1,127 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_10to1_9_3;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.api.rewriters.SoundRewriter;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.v1_10to1_9_3.rewriter.BlockItemPacketRewriter1_10;
+import com.viaversion.viabackwards.protocol.v1_10to1_9_3.rewriter.EntityPacketRewriter1_10;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_10;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.protocol.remapper.ValueTransformer;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+
+public class Protocol1_10To1_9_3 extends BackwardsProtocol<ClientboundPackets1_9_3, ClientboundPackets1_9_3, ServerboundPackets1_9_3, ServerboundPackets1_9_3> {
+
+    public static final BackwardsMappingData MAPPINGS = new BackwardsMappingData("1.10", "1.9.4");
+    private static final ValueTransformer<Float, Short> TO_OLD_PITCH = new ValueTransformer<>(Types.UNSIGNED_BYTE) {
+        public Short transform(PacketWrapper packetWrapper, Float inputValue) {
+            return (short) Math.round(inputValue * 63.5F);
+        }
+    };
+    private final EntityPacketRewriter1_10 entityRewriter = new EntityPacketRewriter1_10(this);
+    private final BlockItemPacketRewriter1_10 itemRewriter = new BlockItemPacketRewriter1_10(this);
+
+    public Protocol1_10To1_9_3() {
+        super(ClientboundPackets1_9_3.class, ClientboundPackets1_9_3.class, ServerboundPackets1_9_3.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        entityRewriter.register();
+        itemRewriter.register();
+
+        SoundRewriter<ClientboundPackets1_9_3> soundRewriter = new SoundRewriter<>(this);
+        registerClientbound(ClientboundPackets1_9_3.CUSTOM_SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.STRING); // 0 - Sound name
+                map(Types.VAR_INT); // 1 - Sound Category
+                map(Types.INT); // 2 - x
+                map(Types.INT); // 3 - y
+                map(Types.INT); // 4 - z
+                map(Types.FLOAT); // 5 - Volume
+                map(Types.FLOAT, TO_OLD_PITCH); // 6 - Pitch
+                handler(soundRewriter.getNamedSoundHandler());
+            }
+        });
+        registerClientbound(ClientboundPackets1_9_3.SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Sound name
+                map(Types.VAR_INT); // 1 - Sound Category
+                map(Types.INT); // 2 - x
+                map(Types.INT); // 3 - y
+                map(Types.INT); // 4 - z
+                map(Types.FLOAT); // 5 - Volume
+                map(Types.FLOAT, TO_OLD_PITCH); // 6 - Pitch
+                handler(soundRewriter.getSoundHandler());
+            }
+        });
+
+        registerServerbound(ServerboundPackets1_9_3.RESOURCE_PACK, new PacketHandlers() {
+            @Override
+            public void register() {
+                read(Types.STRING); // 0 - Hash
+                map(Types.VAR_INT); // 1 - Result
+            }
+        });
+
+        TranslatableRewriter<ClientboundPackets1_9_3> componentRewriter = new TranslatableRewriter<>(this, ComponentRewriter.ReadType.JSON);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_9_3.CHAT);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_10.EntityType.PLAYER));
+    }
+
+    @Override
+    public BackwardsMappingData getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPacketRewriter1_10 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPacketRewriter1_10 getItemRewriter() {
+        return itemRewriter;
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        return true;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_10to1_9_3/rewriter/BlockItemPacketRewriter1_10.java

@@ -0,0 +1,91 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_10to1_9_3.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.protocol.v1_10to1_9_3.Protocol1_10To1_9_3;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+
+public class BlockItemPacketRewriter1_10 extends LegacyBlockItemRewriter<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_10To1_9_3> {
+
+    public BlockItemPacketRewriter1_10(Protocol1_10To1_9_3 protocol) {
+        super(protocol, "1.10");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_9_3.BLOCK_UPDATE);
+        registerMultiBlockChange(ClientboundPackets1_9_3.CHUNK_BLOCKS_UPDATE);
+
+        registerSetSlot(ClientboundPackets1_9_3.CONTAINER_SET_SLOT);
+        registerSetContent(ClientboundPackets1_9_3.CONTAINER_SET_CONTENT);
+
+        registerSetEquippedItem(ClientboundPackets1_9_3.SET_EQUIPPED_ITEM);
+        registerCustomPayloadTradeList(ClientboundPackets1_9_3.CUSTOM_PAYLOAD);
+
+        registerContainerClick(ServerboundPackets1_9_3.CONTAINER_CLICK);
+        registerSetCreativeModeSlot(ServerboundPackets1_9_3.SET_CREATIVE_MODE_SLOT);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.LEVEL_CHUNK, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+            ChunkType1_9_3 type = ChunkType1_9_3.forEnvironment(clientWorld.getEnvironment());
+            Chunk chunk = wrapper.passthrough(type);
+
+            handleChunk(chunk);
+        });
+
+        // Rewrite metadata items
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.dataType().type().equals(Types.ITEM1_8)) // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+        });
+
+        // Particle
+        protocol.registerClientbound(ClientboundPackets1_9_3.LEVEL_PARTICLES, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT);
+                map(Types.BOOLEAN);
+                map(Types.FLOAT);
+                map(Types.FLOAT);
+                map(Types.FLOAT);
+                map(Types.FLOAT);
+                map(Types.FLOAT);
+                map(Types.FLOAT);
+                map(Types.FLOAT);
+                map(Types.INT);
+
+                handler(wrapper -> {
+                    int id = wrapper.get(Types.INT, 0);
+                    if (id == 46) { // new falling_dust
+                        wrapper.set(Types.INT, 0, 38); // -> block_dust
+                    }
+                });
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_10to1_9_3/rewriter/EntityPacketRewriter1_10.java

@@ -0,0 +1,171 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_10to1_9_3.rewriter;
+
+import com.viaversion.viabackwards.api.entities.storage.EntityReplacement;
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.v1_10to1_9_3.Protocol1_10To1_9_3;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_10;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_9;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_9;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import java.util.List;
+
+public class EntityPacketRewriter1_10 extends LegacyEntityRewriter<ClientboundPackets1_9_3, Protocol1_10To1_9_3> {
+
+    public EntityPacketRewriter1_10(Protocol1_10To1_9_3 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_ENTITY, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.BYTE); // 2 - Type
+                map(Types.DOUBLE); // 3 - x
+                map(Types.DOUBLE); // 4 - y
+                map(Types.DOUBLE); // 5 - z
+                map(Types.BYTE); // 6 - Pitch
+                map(Types.BYTE); // 7 - Yaw
+                map(Types.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(EntityTypes1_11.ObjectType::findById));
+
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.ADD_EXPERIENCE_ORB, EntityTypes1_10.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.ADD_GLOBAL_ENTITY, EntityTypes1_10.EntityType.LIGHTNING_BOLT);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.UNSIGNED_BYTE); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Yaw
+                map(Types.BYTE); // 7 - Pitch
+                map(Types.BYTE); // 8 - Head Pitch
+                map(Types.SHORT); // 9 - Velocity X
+                map(Types.SHORT); // 10 - Velocity Y
+                map(Types.SHORT); // 11 - Velocity Z
+                map(Types1_9.ENTITY_DATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler(Types.UNSIGNED_BYTE, 0));
+
+                // Rewrite entity type / metadata
+                handler(wrapper -> {
+                    int entityId = wrapper.get(Types.VAR_INT, 0);
+                    EntityType type = tracker(wrapper.user()).entityType(entityId);
+
+                    List<EntityData> metadata = wrapper.get(Types1_9.ENTITY_DATA_LIST, 0);
+                    handleEntityData(wrapper.get(Types.VAR_INT, 0), metadata, wrapper.user());
+
+                    EntityReplacement entityReplacement = entityDataForType(type);
+                    if (entityReplacement != null) {
+                        WrappedMetadata storage = new WrappedMetadata(metadata);
+                        wrapper.set(Types.UNSIGNED_BYTE, 0, (short) entityReplacement.replacementId());
+                        if (entityReplacement.hasBaseMeta())
+                            entityReplacement.defaultMeta().createMeta(storage);
+                    }
+                });
+
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.ADD_PAINTING, EntityTypes1_10.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.LOGIN, EntityTypes1_10.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Player UUID
+                map(Types.DOUBLE); // 2 - X
+                map(Types.DOUBLE); // 3 - Y
+                map(Types.DOUBLE); // 4 - Z
+                map(Types.BYTE); // 5 - Yaw
+                map(Types.BYTE); // 6 - Pitch
+                map(Types1_9.ENTITY_DATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_9.ENTITY_DATA_LIST, EntityTypes1_11.EntityType.PLAYER));
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_9_3.SET_ENTITY_DATA, Types1_9.ENTITY_DATA_LIST);
+    }
+
+    @Override
+    protected void registerRewrites() {
+        mapEntityTypeWithData(EntityTypes1_10.EntityType.POLAR_BEAR, EntityTypes1_10.EntityType.SHEEP).plainName();
+
+        // Change the sheep color when the polar bear is standing up (index 13 -> Standing up)
+        filter().type(EntityTypes1_10.EntityType.POLAR_BEAR).index(13).handler((event, meta) -> {
+            boolean b = (boolean) meta.getValue();
+
+            meta.setTypeAndValue(EntityDataTypes1_9.BYTE, b ? (byte) (14 & 0x0F) : (byte) (0));
+        });
+
+
+        // Handle husk (index 13 -> Zombie Type)
+        filter().type(EntityTypes1_10.EntityType.ZOMBIE).index(13).handler((event, meta) -> {
+            if ((int) meta.getValue() == 6) { // Is type Husk
+                meta.setValue(0);
+            }
+        });
+
+        // Handle Stray (index 12 -> Skeleton Type)
+        filter().type(EntityTypes1_10.EntityType.SKELETON).index(12).handler((event, meta) -> {
+            if ((int) meta.getValue() == 2) {
+                meta.setValue(0); // Change to default skeleton
+            }
+        });
+
+        // Handle the missing NoGravity tag for every metadata
+        filter().removeIndex(5);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_10.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_10.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11_1to1_11/Protocol1_11_1To1_11.java

@@ -0,0 +1,58 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11_1to1_11;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.protocol.v1_11_1to1_11.rewriter.EntityPacketRewriter1_11_1;
+import com.viaversion.viabackwards.protocol.v1_11_1to1_11.rewriter.ItemPacketRewriter1_11_1;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+
+public class Protocol1_11_1To1_11 extends BackwardsProtocol<ClientboundPackets1_9_3, ClientboundPackets1_9_3, ServerboundPackets1_9_3, ServerboundPackets1_9_3> {
+
+    private final EntityPacketRewriter1_11_1 entityRewriter = new EntityPacketRewriter1_11_1(this);
+    private final ItemPacketRewriter1_11_1 itemRewriter = new ItemPacketRewriter1_11_1(this);
+
+    public Protocol1_11_1To1_11() {
+        super(ClientboundPackets1_9_3.class, ClientboundPackets1_9_3.class, ServerboundPackets1_9_3.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_11.EntityType.PLAYER));
+    }
+
+    @Override
+    public EntityPacketRewriter1_11_1 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public ItemPacketRewriter1_11_1 getItemRewriter() {
+        return itemRewriter;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11_1to1_11/rewriter/EntityPacketRewriter1_11_1.java

@@ -0,0 +1,128 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11_1to1_11.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.v1_11_1to1_11.Protocol1_11_1To1_11;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_9;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+
+public class EntityPacketRewriter1_11_1 extends LegacyEntityRewriter<ClientboundPackets1_9_3, Protocol1_11_1To1_11> {
+
+    public EntityPacketRewriter1_11_1(Protocol1_11_1To1_11 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_ENTITY, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.BYTE); // 2 - Type
+                map(Types.DOUBLE); // 3 - x
+                map(Types.DOUBLE); // 4 - y
+                map(Types.DOUBLE); // 5 - z
+                map(Types.BYTE); // 6 - Pitch
+                map(Types.BYTE); // 7 - Yaw
+                map(Types.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(EntityTypes1_11.ObjectType::findById));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.ADD_EXPERIENCE_ORB, EntityTypes1_11.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.ADD_GLOBAL_ENTITY, EntityTypes1_11.EntityType.LIGHTNING_BOLT);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.VAR_INT); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Yaw
+                map(Types.BYTE); // 7 - Pitch
+                map(Types.BYTE); // 8 - Head Pitch
+                map(Types.SHORT); // 9 - Velocity X
+                map(Types.SHORT); // 10 - Velocity Y
+                map(Types.SHORT); // 11 - Velocity Z
+                map(Types1_9.ENTITY_DATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler());
+
+                // Rewrite entity type / metadata
+                handler(getMobSpawnRewriter1_11(Types1_9.ENTITY_DATA_LIST));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.ADD_PAINTING, EntityTypes1_11.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.LOGIN, EntityTypes1_11.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Player UUID
+                map(Types.DOUBLE); // 2 - X
+                map(Types.DOUBLE); // 3 - Y
+                map(Types.DOUBLE); // 4 - Z
+                map(Types.BYTE); // 5 - Yaw
+                map(Types.BYTE); // 6 - Pitch
+                map(Types1_9.ENTITY_DATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_9.ENTITY_DATA_LIST, EntityTypes1_11.EntityType.PLAYER));
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_9_3.SET_ENTITY_DATA, Types1_9.ENTITY_DATA_LIST);
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Handle non-existing firework metadata (index 7 entity id for boosting)
+        filter().type(EntityTypes1_11.EntityType.FIREWORK_ROCKET).cancel(7);
+
+        // Handle non-existing pig metadata (index 14 - boost time)
+        filter().type(EntityTypes1_11.EntityType.PIG).cancel(14);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11_1to1_11/rewriter/ItemPacketRewriter1_11_1.java

@@ -0,0 +1,81 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11_1to1_11.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.api.rewriters.LegacyEnchantmentRewriter;
+import com.viaversion.viabackwards.protocol.v1_11_1to1_11.Protocol1_11_1To1_11;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+
+public class ItemPacketRewriter1_11_1 extends LegacyBlockItemRewriter<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_11_1To1_11> {
+
+    private LegacyEnchantmentRewriter enchantmentRewriter;
+
+    public ItemPacketRewriter1_11_1(Protocol1_11_1To1_11 protocol) {
+        super(protocol, "1.11.1");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerSetSlot(ClientboundPackets1_9_3.CONTAINER_SET_SLOT);
+        registerSetContent(ClientboundPackets1_9_3.CONTAINER_SET_CONTENT);
+        registerSetEquippedItem(ClientboundPackets1_9_3.SET_EQUIPPED_ITEM);
+        registerCustomPayloadTradeList(ClientboundPackets1_9_3.CUSTOM_PAYLOAD);
+
+        registerContainerClick(ServerboundPackets1_9_3.CONTAINER_CLICK);
+        registerSetCreativeModeSlot(ServerboundPackets1_9_3.SET_CREATIVE_MODE_SLOT);
+
+        // Handle item metadata
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.dataType().type().equals(Types.ITEM1_8)) { // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName());
+        enchantmentRewriter.registerEnchantment(22, "§7Sweeping Edge");
+    }
+
+    @Override
+    public Item handleItemToClient(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(connection, item);
+
+        enchantmentRewriter.handleToClient(item);
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+
+        enchantmentRewriter.handleToServer(item);
+        return item;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/Protocol1_11To1_10.java

@@ -0,0 +1,99 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11to1_10;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.api.rewriters.SoundRewriter;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.rewriter.BlockItemPacketRewriter1_11;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.rewriter.EntityPacketRewriter1_11;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.rewriter.PlayerPacketRewriter1_11;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.storage.WindowTracker;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+
+public class Protocol1_11To1_10 extends BackwardsProtocol<ClientboundPackets1_9_3, ClientboundPackets1_9_3, ServerboundPackets1_9_3, ServerboundPackets1_9_3> {
+
+    public static final BackwardsMappingData MAPPINGS = new BackwardsMappingData("1.11", "1.10");
+    private final EntityPacketRewriter1_11 entityRewriter = new EntityPacketRewriter1_11(this);
+    private final BlockItemPacketRewriter1_11 itemRewriter = new BlockItemPacketRewriter1_11(this);
+    private TranslatableRewriter<ClientboundPackets1_9_3> componentRewriter;
+
+    public Protocol1_11To1_10() {
+        super(ClientboundPackets1_9_3.class, ClientboundPackets1_9_3.class, ServerboundPackets1_9_3.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        entityRewriter.register();
+        itemRewriter.register();
+        PlayerPacketRewriter1_11.register(this);
+
+        SoundRewriter<ClientboundPackets1_9_3> soundRewriter = new SoundRewriter<>(this);
+        soundRewriter.registerNamedSound(ClientboundPackets1_9_3.CUSTOM_SOUND);
+        soundRewriter.registerSound(ClientboundPackets1_9_3.SOUND);
+
+        componentRewriter = new TranslatableRewriter<>(this, ComponentRewriter.ReadType.JSON);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_9_3.CHAT);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_11.EntityType.PLAYER));
+
+        if (!user.has(WindowTracker.class)) {
+            user.put(new WindowTracker());
+        }
+    }
+
+    @Override
+    public BackwardsMappingData getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPacketRewriter1_11 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPacketRewriter1_11 getItemRewriter() {
+        return itemRewriter;
+    }
+
+    public TranslatableRewriter<ClientboundPackets1_9_3> getComponentRewriter() {
+        return componentRewriter;
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        return true;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/data/SplashPotionMappings1_10.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_11to1_10.data;
+
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntOpenHashMap;
+
+public class SplashPotionMappings1_10 {
+
+    private static final Int2IntMap DATA = new Int2IntOpenHashMap(14, 0.99F);
+
+    static {
+        DATA.defaultReturnValue(-1);
+        DATA.put(2039713, 5); // night vision
+        DATA.put(8356754, 7); // invisibility
+        DATA.put(2293580, 9); // jump boost
+        DATA.put(14981690, 12); // fire resistance
+        DATA.put(8171462, 14); // swiftness
+        DATA.put(5926017, 17); // slowness
+        DATA.put(3035801, 19); // water breathing
+        DATA.put(16262179, 21); // instant health
+        DATA.put(4393481, 23); // instant damage
+        DATA.put(5149489, 25); // poison
+        DATA.put(13458603, 28); // regeneration
+        DATA.put(9643043, 31); // strength
+        DATA.put(4738376, 34); // weakness
+        DATA.put(3381504, 36); // luck
+    }
+
+    public static int getOldData(int data) {
+        return DATA.get(data);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/rewriter/BlockItemPacketRewriter1_11.java

@@ -0,0 +1,358 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11to1_10.rewriter;
+
+import com.viaversion.viabackwards.api.data.MappedLegacyBlockItem;
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.api.rewriters.LegacyEnchantmentRewriter;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.Protocol1_11To1_10;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.storage.ChestedHorseStorage;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.storage.WindowTracker;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.EntityTracker;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_9_3;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viaversion.protocols.v1_10to1_11.data.EntityMappings1_11;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.util.IdAndData;
+import java.util.Arrays;
+import java.util.Optional;
+
+public class BlockItemPacketRewriter1_11 extends LegacyBlockItemRewriter<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_11To1_10> {
+
+    private LegacyEnchantmentRewriter enchantmentRewriter;
+
+    public BlockItemPacketRewriter1_11(Protocol1_11To1_10 protocol) {
+        super(protocol, "1.11");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_9_3.BLOCK_UPDATE);
+        registerMultiBlockChange(ClientboundPackets1_9_3.CHUNK_BLOCKS_UPDATE);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.CONTAINER_SET_SLOT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.SHORT); // 1 - Slot ID
+                map(Types.ITEM1_8); // 2 - Slot Value
+
+                handler(wrapper -> handleItemToClient(wrapper.user(), wrapper.get(Types.ITEM1_8, 0)));
+
+                // Handle Llama
+                handler(wrapper -> {
+                    if (isLlama(wrapper.user())) {
+                        Optional<ChestedHorseStorage> horse = getChestedHorse(wrapper.user());
+                        if (horse.isEmpty()) {
+                            return;
+                        }
+
+                        ChestedHorseStorage storage = horse.get();
+                        int currentSlot = wrapper.get(Types.SHORT, 0);
+                        wrapper.set(Types.SHORT, 0, ((Integer) (currentSlot = getNewSlotId(storage, currentSlot))).shortValue());
+                        wrapper.set(Types.ITEM1_8, 0, getNewItem(storage, currentSlot, wrapper.get(Types.ITEM1_8, 0)));
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.CONTAINER_SET_CONTENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.ITEM1_8_SHORT_ARRAY); // 1 - Window Values
+
+                handler(wrapper -> {
+                    Item[] stacks = wrapper.get(Types.ITEM1_8_SHORT_ARRAY, 0);
+                    for (int i = 0; i < stacks.length; i++)
+                        stacks[i] = handleItemToClient(wrapper.user(), stacks[i]);
+
+                    if (isLlama(wrapper.user())) {
+                        Optional<ChestedHorseStorage> horse = getChestedHorse(wrapper.user());
+                        if (horse.isEmpty()) {
+                            return;
+                        }
+                        ChestedHorseStorage storage = horse.get();
+                        stacks = Arrays.copyOf(stacks, !storage.isChested() ? 38 : 53);
+
+                        for (int i = stacks.length - 1; i >= 0; i--) {
+                            stacks[getNewSlotId(storage, i)] = stacks[i];
+                            stacks[i] = getNewItem(storage, i, stacks[i]);
+                        }
+                        wrapper.set(Types.ITEM1_8_SHORT_ARRAY, 0, stacks);
+                    }
+                });
+            }
+        });
+
+        registerSetEquippedItem(ClientboundPackets1_9_3.SET_EQUIPPED_ITEM);
+        registerCustomPayloadTradeList(ClientboundPackets1_9_3.CUSTOM_PAYLOAD);
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CONTAINER_CLICK, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.SHORT); // 1 - Slot
+                map(Types.BYTE); // 2 - Button
+                map(Types.SHORT); // 3 - Action number
+                map(Types.VAR_INT); // 4 - Mode
+                map(Types.ITEM1_8); // 5 - Clicked Item
+
+                handler(wrapper -> handleItemToServer(wrapper.user(), wrapper.get(Types.ITEM1_8, 0)));
+
+                // Llama slot
+                handler(wrapper -> {
+                    if (isLlama(wrapper.user())) {
+                        Optional<ChestedHorseStorage> horse = getChestedHorse(wrapper.user());
+                        if (horse.isEmpty()) {
+                            return;
+                        }
+                        ChestedHorseStorage storage = horse.get();
+                        int clickSlot = wrapper.get(Types.SHORT, 0);
+                        int correctSlot = getOldSlotId(storage, clickSlot);
+
+                        wrapper.set(Types.SHORT, 0, ((Integer) correctSlot).shortValue());
+                    }
+                });
+            }
+        });
+
+        registerSetCreativeModeSlot(ServerboundPackets1_9_3.SET_CREATIVE_MODE_SLOT);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.LEVEL_CHUNK, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+            ChunkType1_9_3 type = ChunkType1_9_3.forEnvironment(clientWorld.getEnvironment()); // Use the 1.10 Chunk type since nothing changed.
+            Chunk chunk = wrapper.passthrough(type);
+
+            handleChunk(chunk);
+
+            // only patch it for signs for now
+            for (CompoundTag tag : chunk.getBlockEntities()) {
+                StringTag idTag = tag.getStringTag("id");
+                if (idTag == null) continue;
+
+                String id = idTag.getValue();
+                if (id.equals("minecraft:sign")) {
+                    idTag.setValue("Sign");
+                }
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_ENTITY_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.BLOCK_POSITION1_8); // 0 - Position
+                map(Types.UNSIGNED_BYTE); // 1 - Action
+                map(Types.NAMED_COMPOUND_TAG); // 2 - NBT
+
+                handler(wrapper -> {
+                    // Remove on shulkerbox decleration
+                    if (wrapper.get(Types.UNSIGNED_BYTE, 0) == 10) {
+                        wrapper.cancel();
+                    }
+                    // Handler Spawners
+                    if (wrapper.get(Types.UNSIGNED_BYTE, 0) == 1) {
+                        CompoundTag tag = wrapper.get(Types.NAMED_COMPOUND_TAG, 0);
+                        EntityMappings1_11.toClientSpawner(tag, true);
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.OPEN_SCREEN, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.STRING); // 1 - Window Type
+                map(Types.COMPONENT); // 2 - Title
+                map(Types.UNSIGNED_BYTE); // 3 - Slots
+
+                handler(wrapper -> {
+                    int entityId = -1;
+                    // Passthrough Entity ID
+                    if (wrapper.get(Types.STRING, 0).equals("EntityHorse")) {
+                        entityId = wrapper.passthrough(Types.INT);
+                    }
+                    // Rewrite window title
+                    protocol.getComponentRewriter().processText(wrapper.user(), wrapper.get(Types.COMPONENT, 0));
+
+                    // Track Inventory
+                    String inventory = wrapper.get(Types.STRING, 0);
+                    WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                    windowTracker.setInventory(inventory);
+                    windowTracker.setEntityId(entityId);
+
+                    // Change llama slotcount to the donkey one
+                    if (isLlama(wrapper.user())) {
+                        wrapper.set(Types.UNSIGNED_BYTE, 1, (short) 17);
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.CONTAINER_CLOSE, new PacketHandlers() {
+            @Override
+            public void register() {
+                // Inventory tracking
+                handler(wrapper -> {
+                    WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                    windowTracker.setInventory(null);
+                    windowTracker.setEntityId(-1);
+                });
+            }
+        });
+
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CONTAINER_CLOSE, new PacketHandlers() {
+            @Override
+            public void register() {
+                // Inventory tracking
+                handler(wrapper -> {
+                    WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                    windowTracker.setInventory(null);
+                    windowTracker.setEntityId(-1);
+                });
+            }
+        });
+
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.dataType().type().equals(Types.ITEM1_8)) // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Handle spawner block entity (map to itself with custom handler)
+        MappedLegacyBlockItem data = itemReplacements.computeIfAbsent(IdAndData.toRawData(52), s -> new MappedLegacyBlockItem(52));
+        data.setBlockEntityHandler((b, tag) -> {
+            EntityMappings1_11.toClientSpawner(tag, true);
+            return tag;
+        });
+
+        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName());
+        enchantmentRewriter.registerEnchantment(71, "§cCurse of Vanishing");
+        enchantmentRewriter.registerEnchantment(10, "§cCurse of Binding");
+
+        enchantmentRewriter.setHideLevelForEnchants(71, 10); // Curses do not display their level
+    }
+
+    @Override
+    public Item handleItemToClient(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(connection, item);
+
+        CompoundTag tag = item.tag();
+        if (tag == null) return item;
+
+        // Rewrite spawn eggs (id checks are done in the method itself)
+        EntityMappings1_11.toClientItem(item, true);
+
+        enchantmentRewriter.handleToClient(item);
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+
+        CompoundTag tag = item.tag();
+        if (tag == null) return item;
+
+        // Rewrite spawn eggs (id checks are done in the method itself)
+        EntityMappings1_11.toServerItem(item, true);
+
+        enchantmentRewriter.handleToServer(item);
+        return item;
+    }
+
+    private boolean isLlama(UserConnection user) {
+        WindowTracker tracker = user.get(WindowTracker.class);
+        if (tracker.getInventory() != null && tracker.getInventory().equals("EntityHorse")) {
+            EntityTracker entTracker = user.getEntityTracker(Protocol1_11To1_10.class);
+            StoredEntityData entityData = entTracker.entityData(tracker.getEntityId());
+            return entityData != null && entityData.type().is(EntityTypes1_11.EntityType.LLAMA);
+        }
+        return false;
+    }
+
+    private Optional<ChestedHorseStorage> getChestedHorse(UserConnection user) {
+        WindowTracker tracker = user.get(WindowTracker.class);
+        if (tracker.getInventory() != null && tracker.getInventory().equals("EntityHorse")) {
+            EntityTracker entTracker = user.getEntityTracker(Protocol1_11To1_10.class);
+            StoredEntityData entityData = entTracker.entityData(tracker.getEntityId());
+            if (entityData != null)
+                return Optional.of(entityData.get(ChestedHorseStorage.class));
+        }
+        return Optional.empty();
+    }
+
+    private int getNewSlotId(ChestedHorseStorage storage, int slotId) {
+        int totalSlots = !storage.isChested() ? 38 : 53;
+        int strength = storage.isChested() ? storage.getLiamaStrength() : 0;
+        int startNonExistingFormula = 2 + 3 * strength;
+        int offsetForm = 15 - (3 * strength);
+
+        if (slotId >= startNonExistingFormula && totalSlots > (slotId + offsetForm))
+            return offsetForm + slotId;
+        if (slotId == 1)
+            return 0;
+        return slotId;
+    }
+
+    private int getOldSlotId(ChestedHorseStorage storage, int slotId) {
+        int strength = storage.isChested() ? storage.getLiamaStrength() : 0;
+        int startNonExistingFormula = 2 + 3 * strength;
+        int endNonExistingFormula = 2 + 3 * (storage.isChested() ? 5 : 0);
+        int offsetForm = endNonExistingFormula - startNonExistingFormula;
+
+        if (slotId == 1 || slotId >= startNonExistingFormula && slotId < endNonExistingFormula)
+            return 0;
+        if (slotId >= endNonExistingFormula)
+            return slotId - offsetForm;
+        if (slotId == 0)
+            return 1;
+        return slotId;
+    }
+
+    private Item getNewItem(ChestedHorseStorage storage, int slotId, Item current) {
+        int strength = storage.isChested() ? storage.getLiamaStrength() : 0;
+        int startNonExistingFormula = 2 + 3 * strength;
+        int endNonExistingFormula = 2 + 3 * (storage.isChested() ? 5 : 0);
+
+        if (slotId >= startNonExistingFormula && slotId < endNonExistingFormula)
+            return new DataItem(166, (byte) 1, (short) 0, getNamedTag("§4SLOT DISABLED"));
+        if (slotId == 1)
+            return null;
+        return current;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/rewriter/EntityPacketRewriter1_11.java

@@ -0,0 +1,368 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11to1_10.rewriter;
+
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.Protocol1_11To1_10;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.data.SplashPotionMappings1_10;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.storage.ChestedHorseStorage;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_9;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_9;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import java.util.List;
+
+public class EntityPacketRewriter1_11 extends LegacyEntityRewriter<ClientboundPackets1_9_3, Protocol1_11To1_10> {
+
+    public EntityPacketRewriter1_11(Protocol1_11To1_10 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.LEVEL_EVENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT);
+                map(Types.BLOCK_POSITION1_8);
+                map(Types.INT);
+                handler(wrapper -> {
+                    int type = wrapper.get(Types.INT, 0);
+                    if (type == 2002 || type == 2007) {
+                        // 2007 potion id doesn't exist in 1.10
+                        if (type == 2007) {
+                            wrapper.set(Types.INT, 0, 2002);
+                        }
+
+                        int mappedData = SplashPotionMappings1_10.getOldData(wrapper.get(Types.INT, 1));
+                        if (mappedData != -1) {
+                            wrapper.set(Types.INT, 1, mappedData);
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_ENTITY, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.BYTE); // 2 - Type
+                map(Types.DOUBLE); // 3 - x
+                map(Types.DOUBLE); // 4 - y
+                map(Types.DOUBLE); // 5 - z
+                map(Types.BYTE); // 6 - Pitch
+                map(Types.BYTE); // 7 - Yaw
+                map(Types.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(EntityTypes1_11.ObjectType::findById));
+
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.ADD_EXPERIENCE_ORB, EntityTypes1_11.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.ADD_GLOBAL_ENTITY, EntityTypes1_11.EntityType.LIGHTNING_BOLT);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.VAR_INT, Types.UNSIGNED_BYTE); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Yaw
+                map(Types.BYTE); // 7 - Pitch
+                map(Types.BYTE); // 8 - Head Pitch
+                map(Types.SHORT); // 9 - Velocity X
+                map(Types.SHORT); // 10 - Velocity Y
+                map(Types.SHORT); // 11 - Velocity Z
+                map(Types1_9.ENTITY_DATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler(Types.UNSIGNED_BYTE, 0));
+
+                // Rewrite entity type / metadata
+                handler(getMobSpawnRewriter(Types1_9.ENTITY_DATA_LIST));
+
+                // Sub 1.11 clients will error if the list is empty
+                handler(wrapper -> {
+                    List<EntityData> metadata = wrapper.get(Types1_9.ENTITY_DATA_LIST, 0);
+                    if (metadata.isEmpty()) {
+                        metadata.add(new EntityData(0, EntityDataTypes1_9.BYTE, (byte) 0));
+                    }
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.ADD_PAINTING, EntityTypes1_11.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.LOGIN, EntityTypes1_11.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ADD_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Player UUID
+                map(Types.DOUBLE); // 2 - X
+                map(Types.DOUBLE); // 3 - Y
+                map(Types.DOUBLE); // 4 - Z
+                map(Types.BYTE); // 5 - Yaw
+                map(Types.BYTE); // 6 - Pitch
+                map(Types1_9.ENTITY_DATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_9.ENTITY_DATA_LIST, EntityTypes1_11.EntityType.PLAYER));
+                handler(wrapper -> {
+                    // Sub 1.11 clients will cry if the list is empty
+                    List<EntityData> metadata = wrapper.get(Types1_9.ENTITY_DATA_LIST, 0);
+                    if (metadata.isEmpty()) {
+                        metadata.add(new EntityData(0, EntityDataTypes1_9.BYTE, (byte) 0));
+                    }
+                });
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_9_3.SET_ENTITY_DATA, Types1_9.ENTITY_DATA_LIST);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ENTITY_EVENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT); // 0 - Entity ID
+                map(Types.BYTE); // 1 - Entity Status
+
+                handler(wrapper -> {
+                    byte b = wrapper.get(Types.BYTE, 0);
+
+                    if (b == 35) {
+                        wrapper.clearPacket();
+                        wrapper.setPacketType(ClientboundPackets1_9_3.GAME_EVENT);
+                        wrapper.write(Types.UNSIGNED_BYTE, (short) 10); // Play Elder Guardian animation
+                        wrapper.write(Types.FLOAT, 0F);
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Guardian
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ELDER_GUARDIAN, EntityTypes1_11.EntityType.GUARDIAN);
+        // Skeletons
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.WITHER_SKELETON, EntityTypes1_11.EntityType.SKELETON).spawnMetadata(storage -> storage.add(getSkeletonTypeMeta(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.STRAY, EntityTypes1_11.EntityType.SKELETON).plainName().spawnMetadata(storage -> storage.add(getSkeletonTypeMeta(2)));
+        // Zombies
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.HUSK, EntityTypes1_11.EntityType.ZOMBIE).plainName().spawnMetadata(storage -> handleZombieType(storage, 6));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ZOMBIE_VILLAGER, EntityTypes1_11.EntityType.ZOMBIE).spawnMetadata(storage -> handleZombieType(storage, 1));
+        // Horses
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.HORSE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(0))); // Nob able to ride the horse without having the MetaType sent.
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.DONKEY, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.MULE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(2)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.SKELETON_HORSE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(4)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ZOMBIE_HORSE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(3)));
+        // New mobs
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.EVOKER_FANGS, EntityTypes1_11.EntityType.SHULKER);
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.EVOKER, EntityTypes1_11.EntityType.VILLAGER).plainName();
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.VEX, EntityTypes1_11.EntityType.BAT).plainName();
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.VINDICATOR, EntityTypes1_11.EntityType.VILLAGER).plainName().spawnMetadata(storage -> storage.add(new EntityData(13, EntityDataTypes1_9.VAR_INT, 4))); // Base Profession
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.LLAMA, EntityTypes1_11.EntityType.HORSE).plainName().spawnMetadata(storage -> storage.add(getHorseMetaType(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.LLAMA_SPIT, EntityTypes1_11.EntityType.SNOWBALL);
+
+        mapObjectType(EntityTypes1_11.ObjectType.LLAMA_SPIT, EntityTypes1_11.ObjectType.SNOWBALL, -1);
+        // Replace with endertorchthingies
+        mapObjectType(EntityTypes1_11.ObjectType.EVOKER_FANGS, EntityTypes1_11.ObjectType.FALLING_BLOCK, 198 | 1 << 12);
+
+        // Handle ElderGuardian & target metadata
+        filter().type(EntityTypes1_11.EntityType.GUARDIAN).index(12).handler((event, meta) -> {
+            boolean b = (boolean) meta.getValue();
+            int bitmask = b ? 0x02 : 0;
+
+            if (event.entityType() == EntityTypes1_11.EntityType.ELDER_GUARDIAN) {
+                bitmask |= 0x04;
+            }
+
+            meta.setTypeAndValue(EntityDataTypes1_9.BYTE, (byte) bitmask);
+        });
+
+        // Handle skeleton swing
+        filter().type(EntityTypes1_11.EntityType.ABSTRACT_SKELETON).index(12).toIndex(13);
+
+        /*
+            ZOMBIE CHANGES
+         */
+        filter().type(EntityTypes1_11.EntityType.ZOMBIE).handler((event, meta) -> {
+            switch (meta.id()) {
+                case 13 -> event.cancel();
+                case 14 -> event.setIndex(15);
+                case 15 -> event.setIndex(14);
+                case 16 -> {
+                    // Profession
+                    event.setIndex(13);
+                    meta.setValue(1 + (int) meta.getValue());
+                }
+            }
+        });
+
+        // Handle Evocation Illager
+        filter().type(EntityTypes1_11.EntityType.EVOKER).index(12).handler((event, meta) -> {
+            event.setIndex(13);
+            meta.setTypeAndValue(EntityDataTypes1_9.VAR_INT, ((Byte) meta.getValue()).intValue()); // Change the profession for the states
+        });
+
+        // Handle Vex (Remove this field completely since the position is not updated correctly when idling for bats. Sad ):
+        filter().type(EntityTypes1_11.EntityType.VEX).index(12).handler((event, meta) -> {
+            meta.setValue((byte) 0x00);
+        });
+
+        // Handle VindicationIllager
+        filter().type(EntityTypes1_11.EntityType.VINDICATOR).index(12).handler((event, meta) -> {
+            event.setIndex(13);
+            meta.setTypeAndValue(EntityDataTypes1_9.VAR_INT, ((Number) meta.getValue()).intValue() == 1 ? 2 : 4);
+        });
+
+        /*
+            HORSES
+         */
+
+        // Handle horse flags
+        filter().type(EntityTypes1_11.EntityType.ABSTRACT_HORSE).index(13).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            byte b = (byte) meta.getValue();
+            if (data.has(ChestedHorseStorage.class) && data.get(ChestedHorseStorage.class).isChested()) {
+                b |= 0x08; // Chested
+                meta.setValue(b);
+            }
+        });
+
+        // Create chested horse storage
+        filter().type(EntityTypes1_11.EntityType.CHESTED_HORSE).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            if (!data.has(ChestedHorseStorage.class)) {
+                data.put(new ChestedHorseStorage());
+            }
+        });
+
+        // Handle horse armor
+        filter().type(EntityTypes1_11.EntityType.HORSE).index(16).toIndex(17);
+
+        // Handle chested horse
+        filter().type(EntityTypes1_11.EntityType.CHESTED_HORSE).index(15).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            ChestedHorseStorage storage = data.get(ChestedHorseStorage.class);
+            boolean b = (boolean) meta.getValue();
+            storage.setChested(b);
+            event.cancel();
+        });
+
+        // Get rid of Liama metadata
+        filter().type(EntityTypes1_11.EntityType.LLAMA).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            ChestedHorseStorage storage = data.get(ChestedHorseStorage.class);
+
+            int index = event.index();
+            // Store them for later (:
+            switch (index) {
+                case 16 -> {
+                    storage.setLiamaStrength((int) meta.getValue());
+                    event.cancel();
+                }
+                case 17 -> {
+                    storage.setLiamaCarpetColor((int) meta.getValue());
+                    event.cancel();
+                }
+                case 18 -> {
+                    storage.setLiamaVariant((int) meta.getValue());
+                    event.cancel();
+                }
+            }
+        });
+
+        // Handle Horse (Correct owner)
+        filter().type(EntityTypes1_11.EntityType.ABSTRACT_HORSE).index(14).toIndex(16);
+
+        // Handle villager - Change non-existing profession
+        filter().type(EntityTypes1_11.EntityType.VILLAGER).index(13).handler((event, meta) -> {
+            if ((int) meta.getValue() == 5) {
+                meta.setValue(0);
+            }
+        });
+
+        // handle new Shulker color meta
+        filter().type(EntityTypes1_11.EntityType.SHULKER).cancel(15);
+    }
+
+    /*
+        0 - Skeleton
+        1 - Wither Skeleton
+        2 - Stray
+     */
+
+    private EntityData getSkeletonTypeMeta(int type) {
+        return new EntityData(12, EntityDataTypes1_9.VAR_INT, type);
+    }
+
+    /*
+        0 - Zombie
+        1-5 - Villager with profession
+        6 - Husk
+     */
+    private EntityData getZombieTypeMeta(int type) {
+        return new EntityData(13, EntityDataTypes1_9.VAR_INT, type);
+    }
+
+    private void handleZombieType(WrappedMetadata storage, int type) {
+        EntityData meta = storage.get(13);
+        if (meta == null) {
+            storage.add(getZombieTypeMeta(type));
+        }
+    }
+
+    /*
+        Horse 0
+        Donkey 1
+        Mule 2
+        Zombie horse 3
+        Skeleton horse 4
+    */
+    private EntityData getHorseMetaType(int type) {
+        return new EntityData(14, EntityDataTypes1_9.VAR_INT, type);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/rewriter/PlayerPacketRewriter1_11.java

@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11to1_10.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_11to1_10.Protocol1_11To1_10;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.protocol.remapper.ValueTransformer;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.util.ComponentUtil;
+
+public class PlayerPacketRewriter1_11 {
+    private static final ValueTransformer<Short, Float> TO_NEW_FLOAT = new ValueTransformer<>(Types.FLOAT) {
+        @Override
+        public Float transform(PacketWrapper wrapper, Short inputValue) {
+            return inputValue / 16f;
+        }
+    };
+
+    public static void register(Protocol1_11To1_10 protocol) {
+        protocol.registerClientbound(ClientboundPackets1_9_3.SET_TITLES, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Action
+
+                handler(wrapper -> {
+                    int action = wrapper.get(Types.VAR_INT, 0);
+
+                    if (action == 2) { // Handle the new ActionBar
+                        JsonElement message = wrapper.read(Types.COMPONENT);
+
+                        wrapper.clearPacket();
+                        wrapper.setPacketType(ClientboundPackets1_9_3.CHAT);
+
+                        // https://bugs.mojang.com/browse/MC-119145
+                        String legacy = ComponentUtil.jsonToLegacy(message);
+                        message = new JsonObject();
+                        message.getAsJsonObject().addProperty("text", legacy);
+
+                        wrapper.write(Types.COMPONENT, message);
+                        wrapper.write(Types.BYTE, (byte) 2);
+                    } else if (action > 2) {
+                        wrapper.set(Types.VAR_INT, 0, action - 1); // Move everything one position down
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.TAKE_ITEM_ENTITY, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Collected entity id
+                map(Types.VAR_INT); // 1 - Collector entity id
+
+                handler(wrapper -> wrapper.read(Types.VAR_INT)); // Ignore item pickup count
+            }
+        });
+
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.USE_ITEM_ON, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.BLOCK_POSITION1_8); // 0 - Location
+                map(Types.VAR_INT); // 1 - Face
+                map(Types.VAR_INT); // 2 - Hand
+
+                map(Types.UNSIGNED_BYTE, TO_NEW_FLOAT);
+                map(Types.UNSIGNED_BYTE, TO_NEW_FLOAT);
+                map(Types.UNSIGNED_BYTE, TO_NEW_FLOAT);
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/storage/ChestedHorseStorage.java

@@ -0,0 +1,63 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11to1_10.storage;
+
+public class ChestedHorseStorage {
+    private boolean chested;
+    private int liamaStrength;
+    private int liamaCarpetColor = -1;
+    private int liamaVariant;
+
+    public boolean isChested() {
+        return chested;
+    }
+
+    public void setChested(boolean chested) {
+        this.chested = chested;
+    }
+
+    public int getLiamaStrength() {
+        return liamaStrength;
+    }
+
+    public void setLiamaStrength(int liamaStrength) {
+        this.liamaStrength = liamaStrength;
+    }
+
+    public int getLiamaCarpetColor() {
+        return liamaCarpetColor;
+    }
+
+    public void setLiamaCarpetColor(int liamaCarpetColor) {
+        this.liamaCarpetColor = liamaCarpetColor;
+    }
+
+    public int getLiamaVariant() {
+        return liamaVariant;
+    }
+
+    public void setLiamaVariant(int liamaVariant) {
+        this.liamaVariant = liamaVariant;
+    }
+
+    @Override
+    public String toString() {
+        return "ChestedHorseStorage{" + "chested=" + chested + ", liamaStrength=" + liamaStrength + ", liamaCarpetColor=" + liamaCarpetColor + ", liamaVariant=" + liamaVariant + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_11to1_10/storage/WindowTracker.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_11to1_10.storage;
+
+import com.viaversion.viaversion.api.connection.StorableObject;
+
+public class WindowTracker implements StorableObject {
+    private String inventory;
+    private int entityId = -1;
+
+    public String getInventory() {
+        return inventory;
+    }
+
+    public void setInventory(String inventory) {
+        this.inventory = inventory;
+    }
+
+    public int getEntityId() {
+        return entityId;
+    }
+
+    public void setEntityId(int entityId) {
+        this.entityId = entityId;
+    }
+
+    @Override
+    public String toString() {
+        return "WindowTracker{" + "inventory='" + inventory + '\'' + ", entityId=" + entityId + '}';
+    }
+}
+

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12_1to1_12/Protocol1_12_1To1_12.java

@@ -0,0 +1,37 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_12_1to1_12;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ServerboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_12to1_12_1.packet.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.v1_12to1_12_1.packet.ServerboundPackets1_12_1;
+
+public class Protocol1_12_1To1_12 extends BackwardsProtocol<ClientboundPackets1_12_1, ClientboundPackets1_12, ServerboundPackets1_12_1, ServerboundPackets1_12> {
+
+    public Protocol1_12_1To1_12() {
+        super(ClientboundPackets1_12_1.class, ClientboundPackets1_12.class, ServerboundPackets1_12_1.class, ServerboundPackets1_12.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        cancelClientbound(ClientboundPackets1_12_1.PLACE_GHOST_RECIPE);
+        cancelServerbound(ServerboundPackets1_12.CRAFTING_RECIPE_PLACEMENT);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12_2to1_12_1/Protocol1_12_2To1_12_1.java

@@ -0,0 +1,70 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12_2to1_12_1;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.protocol.v1_12_2to1_12_1.storage.KeepAliveTracker;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_12to1_12_1.packet.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.v1_12to1_12_1.packet.ServerboundPackets1_12_1;
+
+public class Protocol1_12_2To1_12_1 extends BackwardsProtocol<ClientboundPackets1_12_1, ClientboundPackets1_12_1, ServerboundPackets1_12_1, ServerboundPackets1_12_1> {
+
+    public Protocol1_12_2To1_12_1() {
+        super(ClientboundPackets1_12_1.class, ClientboundPackets1_12_1.class, ServerboundPackets1_12_1.class, ServerboundPackets1_12_1.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerClientbound(ClientboundPackets1_12_1.KEEP_ALIVE, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(packetWrapper -> {
+                    Long keepAlive = packetWrapper.read(Types.LONG);
+                    packetWrapper.user().get(KeepAliveTracker.class).setKeepAlive(keepAlive);
+                    packetWrapper.write(Types.VAR_INT, keepAlive.hashCode());
+                });
+            }
+        });
+
+        registerServerbound(ServerboundPackets1_12_1.KEEP_ALIVE, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(packetWrapper -> {
+                    int keepAlive = packetWrapper.read(Types.VAR_INT);
+                    long realKeepAlive = packetWrapper.user().get(KeepAliveTracker.class).getKeepAlive();
+                    if (keepAlive != Long.hashCode(realKeepAlive)) {
+                        packetWrapper.cancel(); // Wrong data, cancel packet
+                        return;
+                    }
+                    packetWrapper.write(Types.LONG, realKeepAlive);
+                    // Reset KeepAliveTracker (to prevent sending same valid value in a row causing a timeout)
+                    packetWrapper.user().get(KeepAliveTracker.class).setKeepAlive(Integer.MAX_VALUE);
+                });
+            }
+        });
+    }
+
+    @Override
+    public void init(UserConnection userConnection) {
+        userConnection.put(new KeepAliveTracker());
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12_2to1_12_1/storage/KeepAliveTracker.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12_2to1_12_1.storage;
+
+import com.viaversion.viaversion.api.connection.StorableObject;
+
+public class KeepAliveTracker implements StorableObject {
+    private long keepAlive = Integer.MAX_VALUE;
+
+    public long getKeepAlive() {
+        return keepAlive;
+    }
+
+    public void setKeepAlive(long keepAlive) {
+        this.keepAlive = keepAlive;
+    }
+
+    @Override
+    public String toString() {
+        return "KeepAliveTracker{" + "keepAlive=" + keepAlive + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/Protocol1_12To1_11_1.java

@@ -0,0 +1,106 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.storage.ShoulderTracker;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter.BlockItemPacketRewriter1_12;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter.ComponentRewriter1_12;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter.EntityPacketRewriter1_12;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter.SoundPacketRewriter1_12;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ServerboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.SerializerVersion;
+
+public class Protocol1_12To1_11_1 extends BackwardsProtocol<ClientboundPackets1_12, ClientboundPackets1_9_3, ServerboundPackets1_12, ServerboundPackets1_9_3> {
+
+    private static final BackwardsMappingData MAPPINGS = new BackwardsMappingData("1.12", "1.11");
+    private final EntityPacketRewriter1_12 entityRewriter = new EntityPacketRewriter1_12(this);
+    private final BlockItemPacketRewriter1_12 itemRewriter = new BlockItemPacketRewriter1_12(this);
+    private final ComponentRewriter1_12 componentRewriter = new ComponentRewriter1_12(this);
+
+    public Protocol1_12To1_11_1() {
+        super(ClientboundPackets1_12.class, ClientboundPackets1_9_3.class, ServerboundPackets1_12.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        itemRewriter.register();
+        entityRewriter.register();
+        componentRewriter.registerComponentPacket(ClientboundPackets1_12.CHAT);
+        new SoundPacketRewriter1_12(this).register();
+
+        registerClientbound(ClientboundPackets1_12.SET_TITLES, wrapper -> {
+            int action = wrapper.passthrough(Types.VAR_INT);
+            if (action >= 0 && action <= 2) {
+                // Should be done globally in the component rewriter, but /shrug for now
+                String component = wrapper.read(Types.COMPONENT).toString();
+                wrapper.write(Types.COMPONENT, ComponentUtil.convertJsonOrEmpty(component, SerializerVersion.V1_12, SerializerVersion.V1_9));
+            }
+        });
+
+        cancelClientbound(ClientboundPackets1_12.UPDATE_ADVANCEMENTS);
+        cancelClientbound(ClientboundPackets1_12.RECIPE);
+        cancelClientbound(ClientboundPackets1_12.SELECT_ADVANCEMENTS_TAB);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_12.EntityType.PLAYER));
+
+        user.put(new ShoulderTracker(user));
+    }
+
+    @Override
+    public BackwardsMappingData getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPacketRewriter1_12 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPacketRewriter1_12 getItemRewriter() {
+        return itemRewriter;
+    }
+
+    public ComponentRewriter1_12 getComponentRewriter() {
+        return componentRewriter;
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        return true;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/data/BlockColors1_11_1.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.data;
+
+public class BlockColors1_11_1 {
+    private static final String[] COLORS = new String[16];
+
+    static {
+        COLORS[0] = "White";
+        COLORS[1] = "Orange";
+        COLORS[2] = "Magenta";
+        COLORS[3] = "Light Blue";
+        COLORS[4] = "Yellow";
+        COLORS[5] = "Lime";
+        COLORS[6] = "Pink";
+        COLORS[7] = "Gray";
+        COLORS[8] = "Light Gray";
+        COLORS[9] = "Cyan";
+        COLORS[10] = "Purple";
+        COLORS[11] = "Blue";
+        COLORS[12] = "Brown";
+        COLORS[13] = "Green";
+        COLORS[14] = "Red";
+        COLORS[15] = "Black";
+    }
+
+    public static String get(int key) {
+        return key >= 0 && key < COLORS.length ? COLORS[key] : "Unknown color";
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/data/MapColorMappings1_11_1.java

@@ -0,0 +1,97 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.data;
+
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntOpenHashMap;
+
+public class MapColorMappings1_11_1 {
+    private static final Int2IntMap MAPPING = new Int2IntOpenHashMap(64, 0.99F);
+
+    static {
+        MAPPING.defaultReturnValue(-1);
+        MAPPING.put(144, 59); // (148, 124, 114) -> (148, 124, 114)
+        MAPPING.put(145, 56); // (180, 153, 139) -> (180, 153, 139)
+        MAPPING.put(146, 56); // (209, 177, 161) -> (209, 177, 161)
+        MAPPING.put(147, 45); // (111, 94, 85) -> (111, 94, 85)
+        MAPPING.put(148, 63); // (112, 58, 25) -> (112, 58, 25)
+        MAPPING.put(149, 60); // (137, 71, 31) -> (137, 71, 31)
+        MAPPING.put(150, 60); // (159, 82, 36) -> (159, 82, 36)
+        MAPPING.put(151, 136); // (84, 43, 19) -> (84, 43, 19)
+        MAPPING.put(152, 83); // (105, 61, 76) -> (105, 61, 76)
+        MAPPING.put(153, 83); // (129, 75, 93) -> (129, 75, 93)
+        MAPPING.put(154, 80); // (149, 87, 108) -> (149, 87, 108)
+        MAPPING.put(155, 115); // (79, 46, 57) -> (79, 46, 57)
+        MAPPING.put(156, 39); // (79, 76, 97) -> (79, 76, 97)
+        MAPPING.put(157, 39); // (97, 93, 119) -> (97, 93, 119)
+        MAPPING.put(158, 36); // (112, 108, 138) -> (112, 108, 138)
+        MAPPING.put(159, 47); // (59, 57, 73) -> (59, 57, 73)
+        MAPPING.put(160, 60); // (131, 94, 25) -> (131, 94, 25)
+        MAPPING.put(161, 61); // (160, 115, 31) -> (160, 115, 31)
+        MAPPING.put(162, 62); // (186, 133, 36) -> (186, 133, 36)
+        MAPPING.put(163, 137); // (98, 70, 19) -> (98, 70, 19)
+        MAPPING.put(164, 108); // (73, 83, 37) -> (73, 83, 37)
+        MAPPING.put(165, 108); // (89, 101, 46) -> (89, 101, 46)
+        MAPPING.put(166, 109); // (103, 117, 53) -> (103, 117, 53)
+        MAPPING.put(167, 111); // (55, 62, 28) -> (55, 62, 28)
+        MAPPING.put(168, 112); // (113, 54, 55) -> (113, 54, 55)
+        MAPPING.put(169, 113); // (138, 66, 67) -> (138, 66, 67)
+        MAPPING.put(170, 114); // (160, 77, 78) -> (160, 77, 78)
+        MAPPING.put(171, 115); // (85, 41, 41) -> (85, 41, 41)
+        MAPPING.put(172, 118); // (40, 29, 25) -> (40, 29, 25)
+        MAPPING.put(173, 107); // (49, 35, 30) -> (49, 35, 30)
+        MAPPING.put(174, 107); // (57, 41, 35) -> (57, 41, 35)
+        MAPPING.put(175, 118); // (30, 22, 19) -> (30, 22, 19)
+        MAPPING.put(176, 91); // (95, 76, 69) -> (95, 76, 69)
+        MAPPING.put(177, 45); // (116, 92, 85) -> (116, 92, 85)
+        MAPPING.put(178, 46); // (135, 107, 98) -> (135, 107, 98)
+        MAPPING.put(179, 47); // (71, 57, 52) -> (71, 57, 52)
+        MAPPING.put(180, 85); // (61, 65, 65) -> (61, 65, 65)
+        MAPPING.put(181, 44); // (75, 79, 79) -> (75, 79, 79)
+        MAPPING.put(182, 27); // (87, 92, 92) -> (87, 92, 92)
+        MAPPING.put(183, 84); // (46, 49, 49) -> (46, 49, 49)
+        MAPPING.put(184, 83); // (86, 52, 62) -> (86, 52, 62)
+        MAPPING.put(185, 83); // (105, 63, 76) -> (105, 63, 76)
+        MAPPING.put(186, 83); // (122, 73, 88) -> (122, 73, 88)
+        MAPPING.put(187, 84); // (65, 39, 47) -> (65, 39, 47)
+        MAPPING.put(188, 84); // (54, 44, 65) -> (54, 44, 65)
+        MAPPING.put(189, 71); // (66, 53, 79) -> (66, 53, 79)
+        MAPPING.put(190, 71); // (76, 62, 92) -> (76, 62, 92)
+        MAPPING.put(191, 87); // (40, 33, 49) -> (40, 33, 49)
+        MAPPING.put(192, 107); // (54, 35, 25) -> (54, 35, 25)
+        MAPPING.put(193, 139); // (66, 43, 30) -> (66, 43, 30)
+        MAPPING.put(194, 43); // (76, 50, 35) -> (76, 50, 35)
+        MAPPING.put(195, 107); // (40, 26, 19) -> (40, 26, 19)
+        MAPPING.put(196, 111); // (54, 58, 30) -> (54, 58, 30)
+        MAPPING.put(197, 111); // (66, 71, 36) -> (66, 71, 36)
+        MAPPING.put(198, 111); // (76, 82, 42) -> (76, 82, 42)
+        MAPPING.put(199, 107); // (40, 43, 22) -> (40, 43, 22)
+        MAPPING.put(200, 112); // (100, 42, 32) -> (100, 42, 32)
+        MAPPING.put(201, 113); // (123, 52, 40) -> (123, 52, 40)
+        MAPPING.put(202, 113); // (142, 60, 46) -> (142, 60, 46)
+        MAPPING.put(203, 115); // (75, 32, 24) -> (75, 32, 24)
+        MAPPING.put(204, 116); // (26, 16, 11) -> (26, 16, 11)
+        MAPPING.put(205, 117); // (32, 19, 14) -> (32, 19, 14)
+        MAPPING.put(206, 107); // (37, 22, 16) -> (37, 22, 16)
+        MAPPING.put(207, 119); // (20, 12, 8) -> (20, 12, 8)
+    }
+
+    public static int getNearestOldColor(int color) {
+        return MAPPING.getOrDefault(color, color);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/rewriter/BlockItemPacketRewriter1_12.java

@@ -0,0 +1,253 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.data.MapColorMappings1_11_1;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_9_3;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntArrayTag;
+import com.viaversion.nbt.tag.LongArrayTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ServerboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ServerboundPackets1_9_3;
+import java.util.Iterator;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BlockItemPacketRewriter1_12 extends LegacyBlockItemRewriter<ClientboundPackets1_12, ServerboundPackets1_9_3, Protocol1_12To1_11_1> {
+
+    public BlockItemPacketRewriter1_12(Protocol1_12To1_11_1 protocol) {
+        super(protocol, "1.12");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_12.BLOCK_UPDATE);
+        registerMultiBlockChange(ClientboundPackets1_12.CHUNK_BLOCKS_UPDATE);
+
+        protocol.registerClientbound(ClientboundPackets1_12.MAP_ITEM_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT);
+                map(Types.BYTE);
+                map(Types.BOOLEAN);
+                handler(wrapper -> {
+                    int count = wrapper.passthrough(Types.VAR_INT);
+                    for (int i = 0; i < count * 3; i++) {
+                        wrapper.passthrough(Types.BYTE);
+                    }
+                });
+                handler(wrapper -> {
+                    short columns = wrapper.passthrough(Types.UNSIGNED_BYTE);
+                    if (columns <= 0) return;
+
+                    wrapper.passthrough(Types.UNSIGNED_BYTE); // Rows
+                    wrapper.passthrough(Types.UNSIGNED_BYTE); // X
+                    wrapper.passthrough(Types.UNSIGNED_BYTE); // Z
+                    byte[] data = wrapper.read(Types.BYTE_ARRAY_PRIMITIVE);
+                    for (int i = 0; i < data.length; i++) {
+                        short color = (short) (data[i] & 0xFF);
+                        if (color > 143) {
+                            color = (short) MapColorMappings1_11_1.getNearestOldColor(color);
+                            data[i] = (byte) color;
+                        }
+                    }
+                    wrapper.write(Types.BYTE_ARRAY_PRIMITIVE, data);
+                });
+            }
+        });
+
+        registerSetSlot(ClientboundPackets1_12.CONTAINER_SET_SLOT);
+        registerSetContent(ClientboundPackets1_12.CONTAINER_SET_CONTENT);
+        registerSetEquippedItem(ClientboundPackets1_12.SET_EQUIPPED_ITEM);
+        registerCustomPayloadTradeList(ClientboundPackets1_12.CUSTOM_PAYLOAD);
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CONTAINER_CLICK, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.SHORT); // 1 - Slot
+                map(Types.BYTE); // 2 - Button
+                map(Types.SHORT); // 3 - Action number
+                map(Types.VAR_INT); // 4 - Mode
+                map(Types.ITEM1_8); // 5 - Clicked Item
+
+                handler(wrapper -> {
+                    if (wrapper.get(Types.VAR_INT, 0) == 1) { // Shift click
+                        // https://github.com/ViaVersion/ViaVersion/pull/754
+                        // Previously clients grab the item from the clicked slot *before* it has
+                        // been moved however now they grab the slot item *after* it has been moved
+                        // and send that in the packet.
+                        wrapper.set(Types.ITEM1_8, 0, null); // Set null item (probably will work)
+
+                        // Apologize (may happen in some cases, maybe if inventory is full?)
+                        PacketWrapper confirm = wrapper.create(ServerboundPackets1_12.CONTAINER_ACK);
+                        confirm.write(Types.UNSIGNED_BYTE, wrapper.get(Types.UNSIGNED_BYTE, 0));
+                        confirm.write(Types.SHORT, wrapper.get(Types.SHORT, 1));
+                        confirm.write(Types.BOOLEAN, false); // Success - not used
+
+                        wrapper.sendToServer(Protocol1_12To1_11_1.class);
+                        wrapper.cancel();
+                        confirm.sendToServer(Protocol1_12To1_11_1.class);
+                        return;
+
+                    }
+                    Item item = wrapper.get(Types.ITEM1_8, 0);
+                    handleItemToServer(wrapper.user(), item);
+                });
+            }
+        });
+
+        registerSetCreativeModeSlot(ServerboundPackets1_9_3.SET_CREATIVE_MODE_SLOT);
+
+        protocol.registerClientbound(ClientboundPackets1_12.LEVEL_CHUNK, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+            ChunkType1_9_3 type = ChunkType1_9_3.forEnvironment(clientWorld.getEnvironment()); // Use the 1.9.4 Chunk type since nothing changed.
+            Chunk chunk = wrapper.passthrough(type);
+
+            handleChunk(chunk);
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.BLOCK_ENTITY_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.BLOCK_POSITION1_8); // 0 - Position
+                map(Types.UNSIGNED_BYTE); // 1 - Action
+                map(Types.NAMED_COMPOUND_TAG); // 2 - NBT
+
+                handler(wrapper -> {
+                    // Remove bed color
+                    if (wrapper.get(Types.UNSIGNED_BYTE, 0) == 11)
+                        wrapper.cancel();
+                });
+            }
+        });
+
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.dataType().type().equals(Types.ITEM1_8)) // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLIENT_COMMAND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // Action ID
+
+                handler(wrapper -> {
+                    // Open Inventory
+                    if (wrapper.get(Types.VAR_INT, 0) == 2) {
+                        wrapper.cancel();
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(connection, item);
+
+        if (item.tag() != null) {
+            CompoundTag backupTag = new CompoundTag();
+            if (handleNbtToClient(item.tag(), backupTag)) {
+                item.tag().put("Via|LongArrayTags", backupTag);
+            }
+        }
+
+        return item;
+    }
+
+    private boolean handleNbtToClient(CompoundTag compoundTag, CompoundTag backupTag) {
+        // Long array tags were introduced in 1.12 - just remove them
+        // Only save the removed tags instead of blindly copying the entire nbt again
+        Iterator<Map.Entry<String, Tag>> iterator = compoundTag.iterator();
+        boolean hasLongArrayTag = false;
+        while (iterator.hasNext()) {
+            Map.Entry<String, Tag> entry = iterator.next();
+            if (entry.getValue() instanceof CompoundTag tag) {
+                CompoundTag nestedBackupTag = new CompoundTag();
+                backupTag.put(entry.getKey(), nestedBackupTag);
+                hasLongArrayTag |= handleNbtToClient(tag, nestedBackupTag);
+            } else if (entry.getValue() instanceof LongArrayTag tag) {
+                backupTag.put(entry.getKey(), fromLongArrayTag(tag));
+                iterator.remove();
+                hasLongArrayTag = true;
+            }
+        }
+        return hasLongArrayTag;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+
+        if (item.tag() != null) {
+            if (item.tag().remove("Via|LongArrayTags") instanceof CompoundTag tag) {
+                handleNbtToServer(item.tag(), tag);
+            }
+        }
+
+        return item;
+    }
+
+    private void handleNbtToServer(CompoundTag compoundTag, CompoundTag backupTag) {
+        // Restore the removed long array tags
+        for (Map.Entry<String, Tag> entry : backupTag) {
+            if (entry.getValue() instanceof CompoundTag) {
+                CompoundTag nestedTag = compoundTag.getCompoundTag(entry.getKey());
+                handleNbtToServer(nestedTag, (CompoundTag) entry.getValue());
+            } else {
+                compoundTag.put(entry.getKey(), fromIntArrayTag((IntArrayTag) entry.getValue()));
+            }
+        }
+    }
+
+    private IntArrayTag fromLongArrayTag(LongArrayTag tag) {
+        int[] intArray = new int[tag.length() * 2];
+        long[] longArray = tag.getValue();
+        int i = 0;
+        for (long l : longArray) {
+            intArray[i++] = (int) (l >> 32);
+            intArray[i++] = (int) l;
+        }
+        return new IntArrayTag(intArray);
+    }
+
+    private LongArrayTag fromIntArrayTag(IntArrayTag tag) {
+        long[] longArray = new long[tag.length() / 2];
+        int[] intArray = tag.getValue();
+        for (int i = 0, j = 0; i < intArray.length; i += 2, j++) {
+            longArray[j] = (long) intArray[i] << 32 | ((long) intArray[i + 1] & 0xFFFFFFFFL);
+        }
+        return new LongArrayTag(longArray);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/rewriter/ComponentRewriter1_12.java

@@ -0,0 +1,51 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+
+public class ComponentRewriter1_12 extends TranslatableRewriter<ClientboundPackets1_12> {
+
+    public ComponentRewriter1_12(Protocol1_12To1_11_1 protocol) {
+        super(protocol, ComponentRewriter.ReadType.JSON);
+    }
+
+    @Override
+    public void processText(UserConnection connection, JsonElement element) {
+        super.processText(connection, element);
+        if (element == null || !element.isJsonObject()) {
+            return;
+        }
+
+        JsonObject object = element.getAsJsonObject();
+        JsonElement keybind = object.remove("keybind");
+        if (keybind == null) {
+            return;
+        }
+
+        //TODO Add nicer text for the key, also use this component rewriter in more packets
+        object.addProperty("text", keybind.getAsString());
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/rewriter/EntityPacketRewriter1_12.java

@@ -0,0 +1,295 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.storage.ParrotStorage;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.storage.ShoulderTracker;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes1_12;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_12;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+import com.viaversion.nbt.tag.CompoundTag;
+
+public class EntityPacketRewriter1_12 extends LegacyEntityRewriter<ClientboundPackets1_12, Protocol1_12To1_11_1> {
+
+    public EntityPacketRewriter1_12(Protocol1_12To1_11_1 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.ADD_ENTITY, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.BYTE); // 2 - Type
+                map(Types.DOUBLE); // 3 - x
+                map(Types.DOUBLE); // 4 - y
+                map(Types.DOUBLE); // 5 - z
+                map(Types.BYTE); // 6 - Pitch
+                map(Types.BYTE); // 7 - Yaw
+                map(Types.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(EntityTypes1_12.ObjectType::findById));
+
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
+            }
+        });
+
+        registerTracker(ClientboundPackets1_12.ADD_EXPERIENCE_ORB, EntityTypes1_12.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_12.ADD_GLOBAL_ENTITY, EntityTypes1_12.EntityType.LIGHTNING_BOLT);
+
+        protocol.registerClientbound(ClientboundPackets1_12.ADD_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.VAR_INT); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Yaw
+                map(Types.BYTE); // 7 - Pitch
+                map(Types.BYTE); // 8 - Head Pitch
+                map(Types.SHORT); // 9 - Velocity X
+                map(Types.SHORT); // 10 - Velocity Y
+                map(Types.SHORT); // 11 - Velocity Z
+                map(Types1_12.ENTITY_DATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler());
+
+                // Rewrite entity type / metadata
+                handler(getMobSpawnRewriter1_11(Types1_12.ENTITY_DATA_LIST));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_12.ADD_PAINTING, EntityTypes1_12.EntityType.PAINTING);
+
+        protocol.registerClientbound(ClientboundPackets1_12.ADD_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Player UUID
+                map(Types.DOUBLE); // 2 - X
+                map(Types.DOUBLE); // 3 - Y
+                map(Types.DOUBLE); // 4 - Z
+                map(Types.BYTE); // 5 - Yaw
+                map(Types.BYTE); // 6 - Pitch
+                map(Types1_12.ENTITY_DATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_12.ENTITY_DATA_LIST, EntityTypes1_12.EntityType.PLAYER));
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.LOGIN, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT); // 0 - Entity ID
+                map(Types.UNSIGNED_BYTE); // 1 - Gamemode
+                map(Types.INT); // 2 - Dimension
+
+                handler(getTrackerHandler(EntityTypes1_12.EntityType.PLAYER, Types.INT));
+
+                handler(getDimensionHandler(1));
+
+                handler(wrapper -> {
+                    ShoulderTracker tracker = wrapper.user().get(ShoulderTracker.class);
+                    tracker.setEntityId(wrapper.get(Types.INT, 0));
+                });
+
+                // Send fake inventory achievement
+                handler(packetWrapper -> {
+                    PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_9_3.AWARD_STATS, packetWrapper.user());
+
+                    wrapper.write(Types.VAR_INT, 1);
+                    wrapper.write(Types.STRING, "achievement.openInventory");
+                    wrapper.write(Types.VAR_INT, 1);
+
+                    wrapper.scheduleSend(Protocol1_12To1_11_1.class);
+                });
+            }
+        });
+
+        registerRespawn(ClientboundPackets1_12.RESPAWN);
+        registerRemoveEntities(ClientboundPackets1_12.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_12.SET_ENTITY_DATA, Types1_12.ENTITY_DATA_LIST);
+
+        protocol.registerClientbound(ClientboundPackets1_12.UPDATE_ATTRIBUTES, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT);
+                map(Types.INT);
+                handler(wrapper -> {
+                    int size = wrapper.get(Types.INT, 0);
+                    int newSize = size;
+                    for (int i = 0; i < size; i++) {
+                        String key = wrapper.read(Types.STRING);
+                        // Remove new attribute
+                        if (key.equals("generic.flyingSpeed")) {
+                            newSize--;
+                            wrapper.read(Types.DOUBLE);
+                            int modSize = wrapper.read(Types.VAR_INT);
+                            for (int j = 0; j < modSize; j++) {
+                                wrapper.read(Types.UUID);
+                                wrapper.read(Types.DOUBLE);
+                                wrapper.read(Types.BYTE);
+                            }
+                        } else {
+                            wrapper.write(Types.STRING, key);
+                            wrapper.passthrough(Types.DOUBLE);
+                            int modSize = wrapper.passthrough(Types.VAR_INT);
+                            for (int j = 0; j < modSize; j++) {
+                                wrapper.passthrough(Types.UUID);
+                                wrapper.passthrough(Types.DOUBLE);
+                                wrapper.passthrough(Types.BYTE);
+                            }
+                        }
+                    }
+
+                    if (newSize != size) {
+                        wrapper.set(Types.INT, 0, newSize);
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        mapEntityTypeWithData(EntityTypes1_12.EntityType.PARROT, EntityTypes1_12.EntityType.BAT).plainName().spawnMetadata(storage -> storage.add(new EntityData(12, EntityDataTypes1_12.BYTE, (byte) 0x00)));
+        mapEntityTypeWithData(EntityTypes1_12.EntityType.ILLUSIONER, EntityTypes1_12.EntityType.EVOKER).plainName();
+
+        filter().handler((event, meta) -> {
+            if (meta.dataType() == EntityDataTypes1_12.COMPONENT) {
+                protocol.getComponentRewriter().processText(event.user(), (JsonElement) meta.getValue());
+            }
+        });
+
+        // Handle Illager
+        filter().type(EntityTypes1_12.EntityType.EVOKER).removeIndex(12);
+
+        filter().type(EntityTypes1_12.EntityType.ILLUSIONER).index(0).handler((event, meta) -> {
+            byte mask = (byte) meta.getValue();
+
+            if ((mask & 0x20) == 0x20) {
+                mask &= ~0x20;
+            }
+
+            meta.setValue(mask);
+        });
+
+        // Create Parrot storage
+        filter().type(EntityTypes1_12.EntityType.PARROT).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            if (!data.has(ParrotStorage.class)) {
+                data.put(new ParrotStorage());
+            }
+        });
+        // Parrot remove animal metadata
+        filter().type(EntityTypes1_12.EntityType.PARROT).cancel(12); // Is baby
+        filter().type(EntityTypes1_12.EntityType.PARROT).index(13).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            ParrotStorage storage = data.get(ParrotStorage.class);
+            boolean isSitting = (((byte) meta.getValue()) & 0x01) == 0x01;
+            boolean isTamed = (((byte) meta.getValue()) & 0x04) == 0x04;
+
+            if (!storage.isTamed() && isTamed) {
+                // TODO do something to let the user know it's done
+            }
+
+            storage.setTamed(isTamed);
+
+            if (isSitting) {
+                event.setIndex(12);
+                meta.setValue((byte) 0x01);
+                storage.setSitting(true);
+            } else if (storage.isSitting()) {
+                event.setIndex(12);
+                meta.setValue((byte) 0x00);
+                storage.setSitting(false);
+            } else {
+                event.cancel();
+            }
+        }); // Flags (Is sitting etc, might be useful in the future
+        filter().type(EntityTypes1_12.EntityType.PARROT).cancel(14); // Owner
+        filter().type(EntityTypes1_12.EntityType.PARROT).cancel(15); // Variant
+
+        // Left shoulder entity data
+        filter().type(EntityTypes1_12.EntityType.PLAYER).index(15).handler((event, meta) -> {
+            CompoundTag tag = (CompoundTag) meta.getValue();
+            ShoulderTracker tracker = event.user().get(ShoulderTracker.class);
+
+            if (tag.isEmpty() && tracker.getLeftShoulder() != null) {
+                tracker.setLeftShoulder(null);
+                tracker.update();
+            } else if (tag.getStringTag("id") != null && event.entityId() == tracker.getEntityId()) {
+                String id = tag.getStringTag("id").getValue();
+                if (tracker.getLeftShoulder() == null || !tracker.getLeftShoulder().equals(id)) {
+                    tracker.setLeftShoulder(id);
+                    tracker.update();
+                }
+            }
+
+            event.cancel();
+        });
+
+        // Right shoulder entity data
+        filter().type(EntityTypes1_12.EntityType.PLAYER).index(16).handler((event, meta) -> {
+            CompoundTag tag = (CompoundTag) event.data().getValue();
+            ShoulderTracker tracker = event.user().get(ShoulderTracker.class);
+
+            if (tag.isEmpty() && tracker.getRightShoulder() != null) {
+                tracker.setRightShoulder(null);
+                tracker.update();
+            } else if (tag.getStringTag("id") != null && event.entityId() == tracker.getEntityId()) {
+                String id = tag.getStringTag("id").getValue();
+                if (tracker.getRightShoulder() == null || !tracker.getRightShoulder().equals(id)) {
+                    tracker.setRightShoulder(id);
+                    tracker.update();
+                }
+            }
+
+            event.cancel();
+        });
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_12.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_12.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/rewriter/SoundPacketRewriter1_12.java

@@ -0,0 +1,151 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacySoundRewriter;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+
+public class SoundPacketRewriter1_12 extends LegacySoundRewriter<Protocol1_12To1_11_1> {
+
+    public SoundPacketRewriter1_12(Protocol1_12To1_11_1 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.CUSTOM_SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.STRING); // 0 - Sound name
+                map(Types.VAR_INT); // 1 - Sound Category
+                map(Types.INT); // 2 - x
+                map(Types.INT); // 3 - y
+                map(Types.INT); // 4 - z
+                map(Types.FLOAT); // 5 - Volume
+                map(Types.FLOAT); // 6 - Pitch
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Sound name
+                map(Types.VAR_INT); // 1 - Sound Category
+                map(Types.INT); // 2 - x
+                map(Types.INT); // 3 - y
+                map(Types.INT); // 4 - z
+                map(Types.FLOAT); // 5 - Volume
+                map(Types.FLOAT); // 6 - Pitch
+
+                handler(wrapper -> {
+                    int oldId = wrapper.get(Types.VAR_INT, 0);
+                    int newId = handleSounds(oldId);
+                    if (newId == -1) {
+                        wrapper.cancel();
+                        return;
+                    }
+
+                    if (hasPitch(oldId)) {
+                        wrapper.set(Types.FLOAT, 1, handlePitch(oldId));
+                    }
+                    wrapper.set(Types.VAR_INT, 0, newId);
+                });
+            }
+        });
+    }
+
+
+    @Override
+    protected void registerRewrites() {
+        //TODO use the diff file to also have named sound remaps
+        // (there were *A LOT* of refactored names)
+
+        // Replacement sounds, suggestions are always welcome
+        // Automatically generated from PAaaS
+        added(26, 277, 1.4f); // block.end_portal.spawn -> entity.lightning.thunder
+        added(27, -1); // block.end_portal_frame.fill
+
+        added(72, 70); // block.note.bell -> block.note.harp
+        added(73, 70); // block.note.chime -> block.note.harp
+        added(74, 70); // block.note.flute -> block.note.harp
+        added(75, 70); // block.note.guitar -> block.note.harp
+        added(80, 70); // block.note.xylophone -> block.note.harp
+
+        added(150, -1); // entity.boat.paddle_land
+        added(151, -1); // entity.boat.paddle_water
+
+        added(152, -1); // entity.bobber.retrieve
+
+        added(195, -1); // entity.endereye.death
+
+        added(274, 198, 0.8f); // entity.illusion_illager.ambient -> entity.evocation_illager.ambient
+        added(275, 199, 0.8f); // entity.illusion_illager.cast_spell -> entity.evocation_illager.cast_spell
+        added(276, 200, 0.8f); // entity.illusion_illager.death -> entity.evocation_illager.death
+        added(277, 201, 0.8f); // entity.illusion_illager.hurt -> entity.evocation_illager.hurt
+        added(278, 191, 0.9f); // entity.illusion_illager.mirror_move -> entity.endermen.teleport
+        added(279, 203, 1.5f); // entity.illusion_illager.prepare_blindness -> entity.evocation_illager.prepare_summon
+        added(280, 202, 0.8f); // entity.illusion_illager.prepare_mirror -> entity.evocation_illager.prepare_attack
+
+        added(319, 133, 0.6f); // entity.parrot.ambient -> entity.bat.ambient
+        added(320, 134, 1.7f); // entity.parrot.death -> entity.bat.death
+        added(321, 219, 1.5f); // entity.parrot.eat -> entity.generic.eat
+        added(322, 136, 0.7f); // entity.parrot.fly -> entity.bat.loop
+        added(323, 135, 1.6f); // entity.parrot.hurt -> entity.bat.hurt
+        added(324, 138, 1.5f); // entity.parrot.imitate.blaze -> entity.blaze.ambient
+        added(325, 163, 1.5f); // entity.parrot.imitate.creeper -> entity.creeper.primed
+        added(326, 170, 1.5f); // entity.parrot.imitate.elder_guardian -> entity.elder_guardian.ambient
+        added(327, 178, 1.5f); // entity.parrot.imitate.enderdragon -> entity.enderdragon.ambient
+        added(328, 186, 1.5f); // entity.parrot.imitate.enderman -> entity.endermen.ambient
+        added(329, 192, 1.5f); // entity.parrot.imitate.endermite -> entity.endermite.ambient
+        added(330, 198, 1.5f); // entity.parrot.imitate.evocation_illager -> entity.evocation_illager.ambient
+        added(331, 226, 1.5f); // entity.parrot.imitate.ghast -> entity.ghast.ambient
+        added(332, 259, 1.5f); // entity.parrot.imitate.husk -> entity.husk.ambient
+        added(333, 198, 1.3f); // entity.parrot.imitate.illusion_illager -> entity.evocation_illager.ambient
+        added(334, 291, 1.5f); // entity.parrot.imitate.magmacube -> entity.magmacube.squish
+        added(335, 321, 1.5f); // entity.parrot.imitate.polar_bear -> entity.polar_bear.ambient
+        added(336, 337, 1.5f); // entity.parrot.imitate.shulker -> entity.shulker.ambient
+        added(337, 347, 1.5f); // entity.parrot.imitate.silverfish -> entity.silverfish.ambient
+        added(338, 351, 1.5f); // entity.parrot.imitate.skeleton -> entity.skeleton.ambient
+        added(339, 363, 1.5f); // entity.parrot.imitate.slime -> entity.slime.squish
+        added(340, 376, 1.5f); // entity.parrot.imitate.spider -> entity.spider.ambient
+        added(341, 385, 1.5f); // entity.parrot.imitate.stray -> entity.stray.ambient
+        added(342, 390, 1.5f); // entity.parrot.imitate.vex -> entity.vex.ambient
+        added(343, 400, 1.5f); // entity.parrot.imitate.vindication_illager -> entity.vindication_illager.ambient
+        added(344, 403, 1.5f); // entity.parrot.imitate.witch -> entity.witch.ambient
+        added(345, 408, 1.5f); // entity.parrot.imitate.wither -> entity.wither.ambient
+        added(346, 414, 1.5f); // entity.parrot.imitate.wither_skeleton -> entity.wither_skeleton.ambient
+        added(347, 418, 1.5f); // entity.parrot.imitate.wolf -> entity.wolf.ambient
+        added(348, 427, 1.5f); // entity.parrot.imitate.zombie -> entity.zombie.ambient
+        added(349, 438, 1.5f); // entity.parrot.imitate.zombie_pigman -> entity.zombie_pig.ambient
+        added(350, 442, 1.5f); // entity.parrot.imitate.zombie_villager -> entity.zombie_villager.ambient
+        added(351, 155); // entity.parrot.step -> entity.chicken.step
+
+        added(368, 316); // entity.player.hurt_drown -> entity.player.hurt
+        added(369, 316); // entity.player.hurt_on_fire -> entity.player.hurt
+
+        // No replacement sounds for these, since it could be confusing, the toast doesn't show up
+        added(544, -1); // ui.toast.in
+        added(545, -1); // ui.toast.out
+        added(546, 317, 1.5f); // ui.toast.challenge_complete
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/storage/ParrotStorage.java

@@ -0,0 +1,40 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.storage;
+
+public class ParrotStorage {
+    private boolean tamed = true;
+    private boolean sitting = true;
+
+    public boolean isTamed() {
+        return tamed;
+    }
+
+    public void setTamed(boolean tamed) {
+        this.tamed = tamed;
+    }
+
+    public boolean isSitting() {
+        return sitting;
+    }
+
+    public void setSitting(boolean sitting) {
+        this.sitting = sitting;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_12to1_11_1/storage/ShoulderTracker.java

@@ -0,0 +1,125 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_12to1_11_1.storage;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viaversion.api.connection.StoredObject;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_11_1to1_12.packet.ClientboundPackets1_12;
+import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.Key;
+import java.util.Locale;
+
+public class ShoulderTracker extends StoredObject {
+    private int entityId;
+    private String leftShoulder;
+    private String rightShoulder;
+
+    public ShoulderTracker(UserConnection user) {
+        super(user);
+    }
+
+    public void update() {
+        PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_12.CHAT, getUser());
+
+        try {
+            wrapper.write(Types.COMPONENT, ComponentUtil.plainToJson(generateString()));
+        } catch (final Exception e) {
+            throw new RuntimeException(e);
+        }
+        wrapper.write(Types.BYTE, (byte) 2);
+
+        try {
+            wrapper.scheduleSend(Protocol1_12To1_11_1.class);
+        } catch (Exception e) {
+            ViaBackwards.getPlatform().getLogger().severe("Failed to send the shoulder indication");
+            e.printStackTrace();
+        }
+    }
+
+    // Does actionbar not support json colors? :(
+    private String generateString() {
+        StringBuilder builder = new StringBuilder();
+
+        // Empty spaces because the non-json formatting is weird
+        builder.append("  ");
+        if (leftShoulder == null) {
+            builder.append("§4§lNothing");
+        } else {
+            builder.append("§2§l").append(getName(leftShoulder));
+        }
+
+        builder.append("§8§l <- §7§lShoulders§8§l -> ");
+
+        if (rightShoulder == null) {
+            builder.append("§4§lNothing");
+        } else {
+            builder.append("§2§l").append(getName(rightShoulder));
+        }
+
+        return builder.toString();
+    }
+
+    private String getName(String current) {
+        current = Key.stripMinecraftNamespace(current);
+
+        String[] array = current.split("_");
+        StringBuilder builder = new StringBuilder();
+
+        for (String s : array) {
+            builder.append(s.substring(0, 1).toUpperCase(Locale.ROOT))
+                .append(s.substring(1))
+                .append(" ");
+        }
+
+        return builder.toString();
+    }
+
+    public int getEntityId() {
+        return entityId;
+    }
+
+    public void setEntityId(int entityId) {
+        this.entityId = entityId;
+    }
+
+    public String getLeftShoulder() {
+        return leftShoulder;
+    }
+
+    public void setLeftShoulder(String leftShoulder) {
+        this.leftShoulder = leftShoulder;
+    }
+
+    public String getRightShoulder() {
+        return rightShoulder;
+    }
+
+    public void setRightShoulder(String rightShoulder) {
+        this.rightShoulder = rightShoulder;
+    }
+
+    @Override
+    public String toString() {
+        return "ShoulderTracker{" + "entityId=" + entityId + ", leftShoulder='" + leftShoulder + '\'' + ", rightShoulder='" + rightShoulder + '\'' + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_1to1_13/Protocol1_13_1To1_13.java

@@ -0,0 +1,235 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_1to1_13;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter.CommandRewriter1_13_1;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter.EntityPacketRewriter1_13_1;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter.ItemPacketRewriter1_13_1;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter.WorldPacketRewriter1_13_1;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.RegistryType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_13;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.protocol.remapper.ValueTransformer;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_13to1_13_1.Protocol1_13To1_13_1;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.rewriter.StatisticsRewriter;
+import com.viaversion.viaversion.rewriter.TagRewriter;
+import com.viaversion.viaversion.util.ComponentUtil;
+
+public class Protocol1_13_1To1_13 extends BackwardsProtocol<ClientboundPackets1_13, ClientboundPackets1_13, ServerboundPackets1_13, ServerboundPackets1_13> {
+
+    public static final BackwardsMappingData MAPPINGS = new BackwardsMappingData("1.13.2", "1.13", Protocol1_13To1_13_1.class);
+    private final EntityPacketRewriter1_13_1 entityRewriter = new EntityPacketRewriter1_13_1(this);
+    private final ItemPacketRewriter1_13_1 itemRewriter = new ItemPacketRewriter1_13_1(this);
+    private final TranslatableRewriter<ClientboundPackets1_13> translatableRewriter = new TranslatableRewriter<>(this, ComponentRewriter.ReadType.JSON);
+    private final TagRewriter<ClientboundPackets1_13> tagRewriter = new TagRewriter<>(this);
+
+    public Protocol1_13_1To1_13() {
+        super(ClientboundPackets1_13.class, ClientboundPackets1_13.class, ServerboundPackets1_13.class, ServerboundPackets1_13.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        super.registerPackets();
+
+        WorldPacketRewriter1_13_1.register(this);
+
+        translatableRewriter.registerComponentPacket(ClientboundPackets1_13.CHAT);
+        translatableRewriter.registerPlayerCombat(ClientboundPackets1_13.PLAYER_COMBAT);
+        translatableRewriter.registerComponentPacket(ClientboundPackets1_13.DISCONNECT);
+        translatableRewriter.registerTabList(ClientboundPackets1_13.TAB_LIST);
+        translatableRewriter.registerTitle(ClientboundPackets1_13.SET_TITLES);
+        translatableRewriter.registerPing();
+
+        new CommandRewriter1_13_1(this).registerDeclareCommands(ClientboundPackets1_13.COMMANDS);
+
+        registerServerbound(ServerboundPackets1_13.COMMAND_SUGGESTION, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT);
+                map(Types.STRING, new ValueTransformer<>(Types.STRING) {
+                    @Override
+                    public String transform(PacketWrapper wrapper, String inputValue) {
+                        // 1.13 starts sending slash at start, so we remove it for compatibility
+                        return !inputValue.startsWith("/") ? "/" + inputValue : inputValue;
+                    }
+                });
+            }
+        });
+
+        registerServerbound(ServerboundPackets1_13.EDIT_BOOK, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.ITEM1_13);
+                map(Types.BOOLEAN);
+                handler(wrapper -> {
+                    itemRewriter.handleItemToServer(wrapper.user(), wrapper.get(Types.ITEM1_13, 0));
+                    wrapper.write(Types.VAR_INT, 0);
+                });
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_13.OPEN_SCREEN, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // Id
+                map(Types.STRING); // Window Type
+                handler(wrapper -> {
+                    JsonElement title = wrapper.passthrough(Types.COMPONENT);
+                    translatableRewriter.processText(wrapper.user(), title);
+
+                    if (ViaBackwards.getConfig().fix1_13FormattedInventoryTitle()) {
+                        if (title.isJsonObject() && title.getAsJsonObject().size() == 1
+                            && title.getAsJsonObject().has("translate")) {
+                            // Hotfix simple translatable components from being converted to legacy text
+                            return;
+                        }
+
+                        // https://bugs.mojang.com/browse/MC-124543
+                        JsonObject legacyComponent = new JsonObject();
+                        legacyComponent.addProperty("text", ComponentUtil.jsonToLegacy(title));
+                        wrapper.set(Types.COMPONENT, 0, legacyComponent);
+                    }
+                });
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_13.COMMAND_SUGGESTIONS, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // Transaction id
+                map(Types.VAR_INT); // Start
+                map(Types.VAR_INT); // Length
+                map(Types.VAR_INT); // Count
+                handler(wrapper -> {
+                    int start = wrapper.get(Types.VAR_INT, 1);
+                    wrapper.set(Types.VAR_INT, 1, start - 1); // Offset by +1 to take into account / at beginning
+                    // Passthrough suggestions
+                    int count = wrapper.get(Types.VAR_INT, 3);
+                    for (int i = 0; i < count; i++) {
+                        wrapper.passthrough(Types.STRING);
+                        wrapper.passthrough(Types.OPTIONAL_COMPONENT); // Tooltip
+                    }
+                });
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_13.BOSS_EVENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UUID);
+                map(Types.VAR_INT);
+                handler(wrapper -> {
+                    int action = wrapper.get(Types.VAR_INT, 0);
+                    if (action == 0 || action == 3) {
+                        translatableRewriter.processText(wrapper.user(), wrapper.passthrough(Types.COMPONENT));
+                        if (action == 0) {
+                            wrapper.passthrough(Types.FLOAT);
+                            wrapper.passthrough(Types.VAR_INT);
+                            wrapper.passthrough(Types.VAR_INT);
+                            short flags = wrapper.read(Types.UNSIGNED_BYTE);
+                            if ((flags & 0x04) != 0) flags |= 0x02;
+                            wrapper.write(Types.UNSIGNED_BYTE, flags);
+                        }
+                    }
+                });
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_13.UPDATE_ADVANCEMENTS, wrapper -> {
+            wrapper.passthrough(Types.BOOLEAN); // Reset/clear
+            int size = wrapper.passthrough(Types.VAR_INT); // Mapping size
+
+            for (int i = 0; i < size; i++) {
+                wrapper.passthrough(Types.STRING); // Identifier
+                wrapper.passthrough(Types.OPTIONAL_STRING); // Parent
+
+                // Display data
+                if (wrapper.passthrough(Types.BOOLEAN)) {
+                    wrapper.passthrough(Types.COMPONENT); // Title
+                    wrapper.passthrough(Types.COMPONENT); // Description
+                    Item icon = wrapper.passthrough(Types.ITEM1_13);
+                    itemRewriter.handleItemToClient(wrapper.user(), icon);
+                    wrapper.passthrough(Types.VAR_INT); // Frame type
+                    int flags = wrapper.passthrough(Types.INT); // Flags
+                    if ((flags & 1) != 0)
+                        wrapper.passthrough(Types.STRING); // Background texture
+                    wrapper.passthrough(Types.FLOAT); // X
+                    wrapper.passthrough(Types.FLOAT); // Y
+                }
+
+                wrapper.passthrough(Types.STRING_ARRAY); // Criteria
+
+                int arrayLength = wrapper.passthrough(Types.VAR_INT);
+                for (int array = 0; array < arrayLength; array++) {
+                    wrapper.passthrough(Types.STRING_ARRAY); // String array
+                }
+            }
+        });
+
+        tagRewriter.register(ClientboundPackets1_13.UPDATE_TAGS, RegistryType.ITEM);
+        new StatisticsRewriter<>(this).register(ClientboundPackets1_13.AWARD_STATS);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        user.addEntityTracker(getClass(), new EntityTrackerBase(user, EntityTypes1_13.EntityType.PLAYER));
+
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+    }
+
+    @Override
+    public BackwardsMappingData getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPacketRewriter1_13_1 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public ItemPacketRewriter1_13_1 getItemRewriter() {
+        return itemRewriter;
+    }
+
+    public TranslatableRewriter<ClientboundPackets1_13> translatableRewriter() {
+        return translatableRewriter;
+    }
+
+    @Override
+    public TagRewriter<ClientboundPackets1_13> getTagRewriter() {
+        return tagRewriter;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_1to1_13/rewriter/CommandRewriter1_13_1.java

@@ -0,0 +1,44 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.rewriter.CommandRewriter;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class CommandRewriter1_13_1 extends CommandRewriter<ClientboundPackets1_13> {
+
+    public CommandRewriter1_13_1(Protocol1_13_1To1_13 protocol) {
+        super(protocol);
+
+        this.parserHandlers.put("minecraft:dimension", wrapper -> wrapper.write(Types.VAR_INT, 0)); // Single word
+    }
+
+    @Override
+    public @Nullable String handleArgumentType(String argumentType) {
+        if (argumentType.equals("minecraft:column_pos")) {
+            return "minecraft:vec2";
+        } else if (argumentType.equals("minecraft:dimension")) {
+            return "brigadier:string";
+        }
+        return super.handleArgumentType(argumentType);
+    }
+
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_1to1_13/rewriter/EntityPacketRewriter1_13_1.java

@@ -0,0 +1,170 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_13;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_13;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import java.util.List;
+
+public class EntityPacketRewriter1_13_1 extends LegacyEntityRewriter<ClientboundPackets1_13, Protocol1_13_1To1_13> {
+
+    public EntityPacketRewriter1_13_1(Protocol1_13_1To1_13 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_13.ADD_ENTITY, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity id
+                map(Types.UUID); // 1 - UUID
+                map(Types.BYTE); // 2 - Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Pitch
+                map(Types.BYTE); // 7 - Yaw
+                map(Types.INT); // 8 - Data
+
+                handler(wrapper -> {
+                    int entityId = wrapper.get(Types.VAR_INT, 0);
+                    byte type = wrapper.get(Types.BYTE, 0);
+                    EntityTypes1_13.EntityType entType = EntityTypes1_13.getTypeFromId(type, true);
+                    if (entType == null) {
+                        protocol.getLogger().warning("Could not find entity type " + type);
+                        return;
+                    }
+
+                    // Rewrite falling block
+                    if (entType.is(EntityTypes1_13.EntityType.FALLING_BLOCK)) {
+                        int data = wrapper.get(Types.INT, 0);
+                        wrapper.set(Types.INT, 0, protocol.getMappingData().getNewBlockStateId(data));
+                    }
+
+                    // Track Entity
+                    tracker(wrapper.user()).addEntity(entityId, entType);
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_13.ADD_EXPERIENCE_ORB, EntityTypes1_13.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_13.ADD_GLOBAL_ENTITY, EntityTypes1_13.EntityType.LIGHTNING_BOLT);
+
+        protocol.registerClientbound(ClientboundPackets1_13.ADD_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Entity UUID
+                map(Types.VAR_INT); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Yaw
+                map(Types.BYTE); // 7 - Pitch
+                map(Types.BYTE); // 8 - Head Pitch
+                map(Types.SHORT); // 9 - Velocity X
+                map(Types.SHORT); // 10 - Velocity Y
+                map(Types.SHORT); // 11 - Velocity Z
+                map(Types1_13.ENTITY_DATA_LIST); // 12 - Metadata
+
+                // Track Entity
+                handler(getTrackerHandler());
+
+                // Rewrite Metadata
+                handler(wrapper -> {
+                    List<EntityData> metadata = wrapper.get(Types1_13.ENTITY_DATA_LIST, 0);
+                    handleEntityData(wrapper.get(Types.VAR_INT, 0), metadata, wrapper.user());
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.ADD_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Player UUID
+                map(Types.DOUBLE); // 2 - X
+                map(Types.DOUBLE); // 3 - Y
+                map(Types.DOUBLE); // 4 - Z
+                map(Types.BYTE); // 5 - Yaw
+                map(Types.BYTE); // 6 - Pitch
+                map(Types1_13.ENTITY_DATA_LIST); // 7 - Metadata
+
+                handler(getTrackerAndMetaHandler(Types1_13.ENTITY_DATA_LIST, EntityTypes1_13.EntityType.PLAYER));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_13.ADD_PAINTING, EntityTypes1_13.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_13.LOGIN, EntityTypes1_13.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_13.RESPAWN);
+        registerRemoveEntities(ClientboundPackets1_13.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_13.SET_ENTITY_DATA, Types1_13.ENTITY_DATA_LIST);
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Rewrite items & blocks
+        filter().handler((event, meta) -> {
+            if (meta.dataType() == Types1_13.ENTITY_DATA_TYPES.itemType) {
+                protocol.getItemRewriter().handleItemToClient(event.user(), (Item) meta.getValue());
+            } else if (meta.dataType() == Types1_13.ENTITY_DATA_TYPES.optionalBlockStateType) {
+                // Convert to new block id
+                int data = (int) meta.getValue();
+                meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+            } else if (meta.dataType() == Types1_13.ENTITY_DATA_TYPES.particleType) {
+                rewriteParticle(event.user(), (Particle) meta.getValue());
+            } else if (meta.dataType() == Types1_13.ENTITY_DATA_TYPES.optionalComponentType || meta.dataType() == Types1_13.ENTITY_DATA_TYPES.componentType) {
+                JsonElement element = meta.value();
+                protocol.translatableRewriter().processText(event.user(), element);
+            }
+        });
+
+        // Remove shooter UUID
+        filter().type(EntityTypes1_13.EntityType.ABSTRACT_ARROW).cancel(7);
+
+        // Move colors to old position
+        filter().type(EntityTypes1_13.EntityType.SPECTRAL_ARROW).index(8).toIndex(7);
+
+        // Move loyalty level to old position
+        filter().type(EntityTypes1_13.EntityType.TRIDENT).index(8).toIndex(7);
+
+        // Rewrite Minecart blocks
+        registerBlockStateHandler(EntityTypes1_13.EntityType.ABSTRACT_MINECART, 9);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_13.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_13.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_1to1_13/rewriter/ItemPacketRewriter1_13_1.java

@@ -0,0 +1,74 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPackets1_13;
+import com.viaversion.viaversion.rewriter.ItemRewriter;
+
+public class ItemPacketRewriter1_13_1 extends ItemRewriter<ClientboundPackets1_13, ServerboundPackets1_13, Protocol1_13_1To1_13> {
+
+    public ItemPacketRewriter1_13_1(Protocol1_13_1To1_13 protocol) {
+        super(protocol, Types.ITEM1_13, Types.ITEM1_13_SHORT_ARRAY);
+    }
+
+    @Override
+    public void registerPackets() {
+        registerCooldown(ClientboundPackets1_13.COOLDOWN);
+        registerSetContent(ClientboundPackets1_13.CONTAINER_SET_CONTENT);
+        registerSetSlot(ClientboundPackets1_13.CONTAINER_SET_SLOT);
+
+        protocol.registerClientbound(ClientboundPackets1_13.CUSTOM_PAYLOAD, wrapper -> {
+            String channel = wrapper.passthrough(Types.STRING);
+            if (channel.equals("minecraft:trader_list")) {
+                wrapper.passthrough(Types.INT); //Passthrough Window ID
+
+                int size = wrapper.passthrough(Types.UNSIGNED_BYTE);
+                for (int i = 0; i < size; i++) {
+                    //Input Item
+                    Item input = wrapper.passthrough(Types.ITEM1_13);
+                    handleItemToClient(wrapper.user(), input);
+                    //Output Item
+                    Item output = wrapper.passthrough(Types.ITEM1_13);
+                    handleItemToClient(wrapper.user(), output);
+
+                    boolean secondItem = wrapper.passthrough(Types.BOOLEAN); //Has second item
+                    if (secondItem) {
+                        //Second Item
+                        Item second = wrapper.passthrough(Types.ITEM1_13);
+                        handleItemToClient(wrapper.user(), second);
+                    }
+
+                    wrapper.passthrough(Types.BOOLEAN); //Trade disabled
+                    wrapper.passthrough(Types.INT); //Number of tools uses
+                    wrapper.passthrough(Types.INT); //Maximum number of trade uses
+                }
+            }
+        });
+
+        registerSetEquippedItem(ClientboundPackets1_13.SET_EQUIPPED_ITEM);
+        registerContainerClick(ServerboundPackets1_13.CONTAINER_CLICK);
+        registerSetCreativeModeSlot(ServerboundPackets1_13.SET_CREATIVE_MODE_SLOT);
+
+        registerLevelParticles(ClientboundPackets1_13.LEVEL_PARTICLES, Types.FLOAT);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_1to1_13/rewriter/WorldPacketRewriter1_13_1.java

@@ -0,0 +1,78 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_1to1_13.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viaversion.api.minecraft.BlockFace;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.BlockPosition;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_13;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.rewriter.BlockRewriter;
+
+public class WorldPacketRewriter1_13_1 {
+
+    public static void register(Protocol1_13_1To1_13 protocol) {
+        BlockRewriter<ClientboundPackets1_13> blockRewriter = BlockRewriter.legacy(protocol);
+
+        protocol.registerClientbound(ClientboundPackets1_13.LEVEL_CHUNK, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+            Chunk chunk = wrapper.passthrough(ChunkType1_13.forEnvironment(clientWorld.getEnvironment()));
+
+            blockRewriter.handleChunk(chunk);
+        });
+
+        blockRewriter.registerBlockEvent(ClientboundPackets1_13.BLOCK_EVENT);
+        blockRewriter.registerBlockUpdate(ClientboundPackets1_13.BLOCK_UPDATE);
+        blockRewriter.registerChunkBlocksUpdate(ClientboundPackets1_13.CHUNK_BLOCKS_UPDATE);
+        protocol.registerClientbound(ClientboundPackets1_13.LEVEL_EVENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT); // Effect Id
+                map(Types.BLOCK_POSITION1_8); // Location
+                map(Types.INT); // Data
+                handler(wrapper -> {
+                    int id = wrapper.get(Types.INT, 0);
+                    int data = wrapper.get(Types.INT, 1);
+                    if (id == 1010) { // Play record
+                        wrapper.set(Types.INT, 1, protocol.getMappingData().getNewItemId(data));
+                    } else if (id == 2001) { // Block break + block break sound
+                        wrapper.set(Types.INT, 1, protocol.getMappingData().getNewBlockStateId(data));
+                    } else if (id == 2000) { // Smoke
+                        switch (data) { // Down
+                            case 0, 1 -> { // Up
+                                BlockPosition pos = wrapper.get(Types.BLOCK_POSITION1_8, 0);
+                                BlockFace relative = data == 0 ? BlockFace.BOTTOM : BlockFace.TOP;
+                                wrapper.set(Types.BLOCK_POSITION1_8, 0, pos.getRelative(relative)); // Y Offset
+                                wrapper.set(Types.INT, 1, 4); // Self
+                            }
+                            case 2 -> wrapper.set(Types.INT, 1, 1); // North
+                            case 3 -> wrapper.set(Types.INT, 1, 7); // South
+                            case 4 -> wrapper.set(Types.INT, 1, 3); // West
+                            case 5 -> wrapper.set(Types.INT, 1, 5); // East
+                        }
+                    }
+                });
+            }
+        });
+
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_2to1_13_1/Protocol1_13_2To1_13_1.java

@@ -0,0 +1,81 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_2to1_13_1;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.rewriter.EntityPacketRewriter1_13_2;
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.rewriter.ItemPacketRewriter1_13_2;
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.rewriter.WorldPacketRewriter1_13_2;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPackets1_13;
+
+public class Protocol1_13_2To1_13_1 extends BackwardsProtocol<ClientboundPackets1_13, ClientboundPackets1_13, ServerboundPackets1_13, ServerboundPackets1_13> {
+
+    public Protocol1_13_2To1_13_1() {
+        super(ClientboundPackets1_13.class, ClientboundPackets1_13.class, ServerboundPackets1_13.class, ServerboundPackets1_13.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        ItemPacketRewriter1_13_2.register(this);
+        WorldPacketRewriter1_13_2.register(this);
+        EntityPacketRewriter1_13_2.register(this);
+
+        registerServerbound(ServerboundPackets1_13.EDIT_BOOK, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.ITEM1_13, Types.ITEM1_13_2);
+            }
+        });
+
+        registerClientbound(ClientboundPackets1_13.UPDATE_ADVANCEMENTS, wrapper -> {
+            wrapper.passthrough(Types.BOOLEAN); // Reset/clear
+            int size = wrapper.passthrough(Types.VAR_INT); // Mapping size
+
+            for (int i = 0; i < size; i++) {
+                wrapper.passthrough(Types.STRING); // Identifier
+                wrapper.passthrough(Types.OPTIONAL_STRING); // Parent
+
+                // Display data
+                if (wrapper.passthrough(Types.BOOLEAN)) {
+                    wrapper.passthrough(Types.COMPONENT); // Title
+                    wrapper.passthrough(Types.COMPONENT); // Description
+                    Item icon = wrapper.read(Types.ITEM1_13_2);
+                    wrapper.write(Types.ITEM1_13, icon);
+                    wrapper.passthrough(Types.VAR_INT); // Frame type
+                    int flags = wrapper.passthrough(Types.INT); // Flags
+                    if ((flags & 1) != 0)
+                        wrapper.passthrough(Types.STRING); // Background texture
+                    wrapper.passthrough(Types.FLOAT); // X
+                    wrapper.passthrough(Types.FLOAT); // Y
+                }
+
+                wrapper.passthrough(Types.STRING_ARRAY); // Criteria
+
+                int arrayLength = wrapper.passthrough(Types.VAR_INT);
+                for (int array = 0; array < arrayLength; array++) {
+                    wrapper.passthrough(Types.STRING_ARRAY); // String array
+                }
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_2to1_13_1/rewriter/EntityPacketRewriter1_13_2.java

@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.Protocol1_13_2To1_13_1;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityData;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_13;
+import com.viaversion.viaversion.api.type.types.version.Types1_13_2;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+
+public class EntityPacketRewriter1_13_2 {
+
+
+    public static void register(Protocol1_13_2To1_13_1 protocol) {
+        protocol.registerClientbound(ClientboundPackets1_13.ADD_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Entity UUID
+                map(Types.VAR_INT); // 2 - Entity Type
+                map(Types.DOUBLE); // 3 - X
+                map(Types.DOUBLE); // 4 - Y
+                map(Types.DOUBLE); // 5 - Z
+                map(Types.BYTE); // 6 - Yaw
+                map(Types.BYTE); // 7 - Pitch
+                map(Types.BYTE); // 8 - Head Pitch
+                map(Types.SHORT); // 9 - Velocity X
+                map(Types.SHORT); // 10 - Velocity Y
+                map(Types.SHORT); // 11 - Velocity Z
+                map(Types1_13_2.ENTITY_DATA_LIST, Types1_13.ENTITY_DATA_LIST); // 12 - Metadata
+
+                handler(wrapper -> {
+                    for (EntityData metadata : wrapper.get(Types1_13.ENTITY_DATA_LIST, 0)) {
+                        metadata.setDataType(Types1_13.ENTITY_DATA_TYPES.byId(metadata.dataType().typeId()));
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.ADD_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.UUID); // 1 - Player UUID
+                map(Types.DOUBLE); // 2 - X
+                map(Types.DOUBLE); // 3 - Y
+                map(Types.DOUBLE); // 4 - Z
+                map(Types.BYTE); // 5 - Yaw
+                map(Types.BYTE); // 6 - Pitch
+                map(Types1_13_2.ENTITY_DATA_LIST, Types1_13.ENTITY_DATA_LIST); // 7 - Metadata
+
+                handler(wrapper -> {
+                    for (EntityData metadata : wrapper.get(Types1_13.ENTITY_DATA_LIST, 0)) {
+                        metadata.setDataType(Types1_13.ENTITY_DATA_TYPES.byId(metadata.dataType().typeId()));
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SET_ENTITY_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types1_13_2.ENTITY_DATA_LIST, Types1_13.ENTITY_DATA_LIST); // 1 - Metadata list
+
+                handler(wrapper -> {
+                    for (EntityData metadata : wrapper.get(Types1_13.ENTITY_DATA_LIST, 0)) {
+                        metadata.setDataType(Types1_13.ENTITY_DATA_TYPES.byId(metadata.dataType().typeId()));
+                    }
+                });
+            }
+        });
+    }
+
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_2to1_13_1/rewriter/ItemPacketRewriter1_13_2.java

@@ -0,0 +1,137 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.Protocol1_13_2To1_13_1;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPackets1_13;
+
+public class ItemPacketRewriter1_13_2 {
+
+    public static void register(Protocol1_13_2To1_13_1 protocol) {
+        protocol.registerClientbound(ClientboundPackets1_13.CONTAINER_SET_SLOT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.SHORT); // 1 - Slot ID
+                map(Types.ITEM1_13_2, Types.ITEM1_13); // 2 - Slot Value
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.CONTAINER_SET_CONTENT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.ITEM1_13_2_SHORT_ARRAY, Types.ITEM1_13_SHORT_ARRAY); // 1 - Window Values
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.CUSTOM_PAYLOAD, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.STRING); // Channel
+                handler(wrapper -> {
+                    String channel = wrapper.get(Types.STRING, 0);
+                    if (channel.equals("minecraft:trader_list") || channel.equals("trader_list")) {
+                        wrapper.passthrough(Types.INT); // Passthrough Window ID
+
+                        int size = wrapper.passthrough(Types.UNSIGNED_BYTE);
+                        for (int i = 0; i < size; i++) {
+                            // Input Item
+                            wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+                            // Output Item
+                            wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+
+                            boolean secondItem = wrapper.passthrough(Types.BOOLEAN); // Has second item
+                            if (secondItem) {
+                                wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+                            }
+
+                            wrapper.passthrough(Types.BOOLEAN); // Trade disabled
+                            wrapper.passthrough(Types.INT); // Number of tools uses
+                            wrapper.passthrough(Types.INT); // Maximum number of trade uses
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SET_EQUIPPED_ITEM, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.VAR_INT); // 0 - Entity ID
+                map(Types.VAR_INT); // 1 - Slot ID
+                map(Types.ITEM1_13_2, Types.ITEM1_13); // 2 - Item
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.UPDATE_RECIPES, wrapper -> {
+            int recipesNo = wrapper.passthrough(Types.VAR_INT);
+            for (int i = 0; i < recipesNo; i++) {
+                wrapper.passthrough(Types.STRING); // Id
+                String type = wrapper.passthrough(Types.STRING);
+                if (type.equals("crafting_shapeless")) {
+                    wrapper.passthrough(Types.STRING); // Group
+                    int ingredientsNo = wrapper.passthrough(Types.VAR_INT);
+                    for (int i1 = 0; i1 < ingredientsNo; i1++) {
+                        wrapper.write(Types.ITEM1_13_ARRAY, wrapper.read(Types.ITEM1_13_2_ARRAY));
+                    }
+                    wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+                } else if (type.equals("crafting_shaped")) {
+                    int ingredientsNo = wrapper.passthrough(Types.VAR_INT) * wrapper.passthrough(Types.VAR_INT);
+                    wrapper.passthrough(Types.STRING); // Group
+                    for (int i1 = 0; i1 < ingredientsNo; i1++) {
+                        wrapper.write(Types.ITEM1_13_ARRAY, wrapper.read(Types.ITEM1_13_2_ARRAY));
+                    }
+                    wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+                } else if (type.equals("smelting")) {
+                    wrapper.passthrough(Types.STRING); // Group
+                    // Ingredient start
+                    wrapper.write(Types.ITEM1_13_ARRAY, wrapper.read(Types.ITEM1_13_2_ARRAY));
+                    // Ingredient end
+                    wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+                    wrapper.passthrough(Types.FLOAT); // EXP
+                    wrapper.passthrough(Types.VAR_INT); // Cooking time
+                }
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_13.CONTAINER_CLICK, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.UNSIGNED_BYTE); // 0 - Window ID
+                map(Types.SHORT); // 1 - Slot
+                map(Types.BYTE); // 2 - Button
+                map(Types.SHORT); // 3 - Action number
+                map(Types.VAR_INT); // 4 - Mode
+                map(Types.ITEM1_13, Types.ITEM1_13_2); // 5 - Clicked Item
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_13.SET_CREATIVE_MODE_SLOT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.SHORT); // 0 - Slot
+                map(Types.ITEM1_13, Types.ITEM1_13_2); // 1 - Clicked Item
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13_2to1_13_1/rewriter/WorldPacketRewriter1_13_2.java

@@ -0,0 +1,52 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.rewriter;
+
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.Protocol1_13_2To1_13_1;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+
+public class WorldPacketRewriter1_13_2 {
+
+    public static void register(Protocol1_13_2To1_13_1 protocol) {
+        protocol.registerClientbound(ClientboundPackets1_13.LEVEL_PARTICLES, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Types.INT); // 0 - Particle ID
+                map(Types.BOOLEAN); // 1 - Long Distance
+                map(Types.FLOAT); // 2 - X
+                map(Types.FLOAT); // 3 - Y
+                map(Types.FLOAT); // 4 - Z
+                map(Types.FLOAT); // 5 - Offset X
+                map(Types.FLOAT); // 6 - Offset Y
+                map(Types.FLOAT); // 7 - Offset Z
+                map(Types.FLOAT); // 8 - Particle Data
+                map(Types.INT); // 9 - Particle Count
+
+                handler(wrapper -> {
+                    int id = wrapper.get(Types.INT, 0);
+                    if (id == 27) {
+                        wrapper.write(Types.ITEM1_13, wrapper.read(Types.ITEM1_13_2));
+                    }
+                });
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/Protocol1_13To1_12_2.java

@@ -0,0 +1,179 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_13to1_12_2;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.data.BackwardsMappingData1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.data.PaintingNames1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.provider.BackwardsBlockEntityProvider;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.rewriter.BlockItemPacketRewriter1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.rewriter.EntityPacketRewriter1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.rewriter.PlayerPacketRewriter1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.rewriter.SoundPacketRewriter1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.storage.BackwardsBlockStorage;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.storage.NoteBlockStorage;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.storage.PlayerPositionStorage1_13;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.storage.TabCompleteStorage;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_13;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonParser;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.packet.ServerboundPackets1_13;
+import com.viaversion.viaversion.protocols.v1_12to1_12_1.packet.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.v1_12to1_12_1.packet.ServerboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.ProtocolLogger;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class Protocol1_13To1_12_2 extends BackwardsProtocol<ClientboundPackets1_13, ClientboundPackets1_12_1, ServerboundPackets1_13, ServerboundPackets1_12_1> {
+
+    public static final BackwardsMappingData1_13 MAPPINGS = new BackwardsMappingData1_13();
+    public static final ProtocolLogger LOGGER = new ProtocolLogger(Protocol1_13To1_12_2.class);
+    private final EntityPacketRewriter1_13 entityRewriter = new EntityPacketRewriter1_13(this);
+    private final BlockItemPacketRewriter1_13 blockItemPackets = new BlockItemPacketRewriter1_13(this);
+    private final TranslatableRewriter<ClientboundPackets1_13> translatableRewriter = new TranslatableRewriter<>(this, ComponentRewriter.ReadType.JSON) {
+        @Override
+        protected void handleTranslate(JsonObject root, String translate) {
+            String mappedKey = mappedTranslationKey(translate);
+            if (mappedKey != null || (mappedKey = getMappingData().getTranslateMappings().get(translate)) != null) {
+                root.addProperty("translate", mappedKey);
+            }
+        }
+    };
+    private final TranslatableRewriter<ClientboundPackets1_13> translatableToLegacyRewriter = new TranslatableRewriter<>(this, ComponentRewriter.ReadType.JSON) {
+        @Override
+        protected void handleTranslate(JsonObject root, String translate) {
+            String mappedKey = mappedTranslationKey(translate);
+            if (mappedKey != null || (mappedKey = getMappingData().getTranslateMappings().get(translate)) != null) {
+                root.addProperty("translate", Protocol1_12_2To1_13.MAPPINGS.getMojangTranslation().getOrDefault(mappedKey, mappedKey));
+            }
+        }
+    };
+
+    public Protocol1_13To1_12_2() {
+        super(ClientboundPackets1_13.class, ClientboundPackets1_12_1.class, ServerboundPackets1_13.class, ServerboundPackets1_12_1.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        executeAsyncAfterLoaded(Protocol1_12_2To1_13.class, () -> {
+            MAPPINGS.load();
+            PaintingNames1_13.init();
+            Via.getManager().getProviders().register(BackwardsBlockEntityProvider.class, new BackwardsBlockEntityProvider());
+        });
+
+        translatableRewriter.registerPing();
+        translatableRewriter.registerBossEvent(ClientboundPackets1_13.BOSS_EVENT);
+        translatableRewriter.registerComponentPacket(ClientboundPackets1_13.CHAT);
+        translatableRewriter.registerLegacyOpenWindow(ClientboundPackets1_13.OPEN_SCREEN);
+        translatableRewriter.registerComponentPacket(ClientboundPackets1_13.DISCONNECT);
+        translatableRewriter.registerPlayerCombat(ClientboundPackets1_13.PLAYER_COMBAT);
+        translatableRewriter.registerTitle(ClientboundPackets1_13.SET_TITLES);
+        translatableRewriter.registerTabList(ClientboundPackets1_13.TAB_LIST);
+
+        blockItemPackets.register();
+        entityRewriter.register();
+        new PlayerPacketRewriter1_13(this).register();
+        new SoundPacketRewriter1_13(this).register();
+
+        cancelClientbound(ClientboundPackets1_13.TAG_QUERY);
+        cancelClientbound(ClientboundPackets1_13.PLACE_GHOST_RECIPE);
+        cancelClientbound(ClientboundPackets1_13.RECIPE);
+        cancelClientbound(ClientboundPackets1_13.UPDATE_ADVANCEMENTS);
+        cancelClientbound(ClientboundPackets1_13.UPDATE_RECIPES);
+        cancelClientbound(ClientboundPackets1_13.UPDATE_TAGS);
+
+        cancelServerbound(ServerboundPackets1_12_1.PLACE_RECIPE);
+        cancelServerbound(ServerboundPackets1_12_1.RECIPE_BOOK_UPDATE);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_13.EntityType.PLAYER));
+
+        user.put(new BackwardsBlockStorage());
+        user.put(new TabCompleteStorage());
+
+        if (ViaBackwards.getConfig().isFix1_13FacePlayer() && !user.has(PlayerPositionStorage1_13.class)) {
+            user.put(new PlayerPositionStorage1_13());
+        }
+
+        user.put(new NoteBlockStorage());
+    }
+
+    @Override
+    public BackwardsMappingData1_13 getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public ProtocolLogger getLogger() {
+        return LOGGER;
+    }
+
+    @Override
+    public EntityPacketRewriter1_13 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPacketRewriter1_13 getItemRewriter() {
+        return blockItemPackets;
+    }
+
+    // Don't override the parent method
+    public TranslatableRewriter<ClientboundPackets1_13> translatableRewriter() {
+        return translatableRewriter;
+    }
+
+    public String jsonToLegacy(UserConnection connection, String value) {
+        if (value.isEmpty()) {
+            return "";
+        }
+
+        try {
+            return jsonToLegacy(connection, JsonParser.parseString(value));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return "";
+    }
+
+    public String jsonToLegacy(UserConnection connection, @Nullable JsonElement value) {
+        if (value == null || value.isJsonNull()) {
+            return "";
+        }
+
+        translatableToLegacyRewriter.processText(connection, value);
+        return ComponentUtil.jsonToLegacy(value);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/block_entity_handlers/BannerHandler.java

@@ -0,0 +1,60 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_13to1_12_2.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.Protocol1_13To1_12_2;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.provider.BackwardsBlockEntityProvider.BackwardsBlockEntityHandler;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+
+public class BannerHandler implements BackwardsBlockEntityHandler {
+    private static final int WALL_BANNER_START = 7110; // 4 each
+    private static final int WALL_BANNER_STOP = 7173;
+
+    private static final int BANNER_START = 6854; // 16 each
+    private static final int BANNER_STOP = 7109;
+
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        // Normal banners
+        if (blockId >= BANNER_START && blockId <= BANNER_STOP) {
+            int color = (blockId - BANNER_START) >> 4;
+            tag.putInt("Base", 15 - color);
+        }
+        // Wall banners
+        else if (blockId >= WALL_BANNER_START && blockId <= WALL_BANNER_STOP) {
+            int color = (blockId - WALL_BANNER_START) >> 2;
+            tag.putInt("Base", 15 - color);
+        } else {
+            Protocol1_13To1_12_2.LOGGER.warning("Why does this block have the banner block entity? :(" + tag);
+        }
+
+        // Invert colors
+        ListTag<CompoundTag> patternsTag = tag.getListTag("Patterns", CompoundTag.class);
+        if (patternsTag != null) {
+            for (CompoundTag pattern : patternsTag) {
+                NumberTag colorTag = pattern.getNumberTag("Color");
+                pattern.putInt("Color", 15 - colorTag.asInt()); // Invert color id
+            }
+        }
+
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/block_entity_handlers/BedHandler.java

@@ -0,0 +1,35 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_13to1_12_2.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.provider.BackwardsBlockEntityProvider;
+import com.viaversion.nbt.tag.CompoundTag;
+
+public class BedHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        int offset = blockId - 748;
+        int color = offset >> 4;
+
+        tag.putInt("color", color);
+
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/block_entity_handlers/FlowerPotHandler.java

@@ -0,0 +1,81 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.v1_13to1_12_2.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.provider.BackwardsBlockEntityProvider;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viaversion.util.Pair;
+
+public class FlowerPotHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    private static final Int2ObjectMap<Pair<String, Byte>> FLOWERS = new Int2ObjectOpenHashMap<>(22, 0.99F);
+    private static final Pair<String, Byte> AIR = new Pair<>("minecraft:air", (byte) 0);
+
+    static {
+        FLOWERS.put(5265, AIR);
+        register(5266, "minecraft:sapling", (byte) 0);
+        register(5267, "minecraft:sapling", (byte) 1);
+        register(5268, "minecraft:sapling", (byte) 2);
+        register(5269, "minecraft:sapling", (byte) 3);
+        register(5270, "minecraft:sapling", (byte) 4);
+        register(5271, "minecraft:sapling", (byte) 5);
+        register(5272, "minecraft:tallgrass", (byte) 2);
+        register(5273, "minecraft:yellow_flower", (byte) 0);
+        register(5274, "minecraft:red_flower", (byte) 0);
+        register(5275, "minecraft:red_flower", (byte) 1);
+        register(5276, "minecraft:red_flower", (byte) 2);
+        register(5277, "minecraft:red_flower", (byte) 3);
+        register(5278, "minecraft:red_flower", (byte) 4);
+        register(5279, "minecraft:red_flower", (byte) 5);
+        register(5280, "minecraft:red_flower", (byte) 6);
+        register(5281, "minecraft:red_flower", (byte) 7);
+        register(5282, "minecraft:red_flower", (byte) 8);
+        register(5283, "minecraft:red_mushroom", (byte) 0);
+        register(5284, "minecraft:brown_mushroom", (byte) 0);
+        register(5285, "minecraft:deadbush", (byte) 0);
+        register(5286, "minecraft:cactus", (byte) 0);
+    }
+
+    private static void register(int id, String identifier, byte data) {
+        FLOWERS.put(id, new Pair<>(identifier, data));
+    }
+
+    public static boolean isFlowah(int id) {
+        return id >= 5265 && id <= 5286;
+    }
+
+    public Pair<String, Byte> getOrDefault(int blockId) {
+        Pair<String, Byte> pair = FLOWERS.get(blockId);
+        return pair != null ? pair : AIR;
+    }
+
+    // TODO THIS IS NEVER CALLED BECAUSE ITS NO LONGER A BLOCK ENTITY :(
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        Pair<String, Byte> item = getOrDefault(blockId);
+
+        tag.putString("Item", item.key());
+        tag.putInt("Data", item.value());
+
+        return tag;
+    }
+
+}

common/src/main/java/com/viaversion/viabackwards/protocol/v1_13to1_12_2/block_entity_handlers/PistonHandler.java

@@ -0,0 +1,112 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.v1_13to1_12_2.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.Protocol1_13To1_12_2;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.provider.BackwardsBlockEntityProvider;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.viaversion.libs.fastutil.objects.Object2IntMap;
+import com.viaversion.viaversion.libs.fastutil.objects.Object2IntOpenHashMap;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.protocols.v1_12_2to1_13.blockconnections.ConnectionData;
+import java.util.Map;
+import java.util.StringJoiner;
+
+public class PistonHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    private final Object2IntMap<String> pistonIds = new Object2IntOpenHashMap<>();
+
+    public PistonHandler() {
+        pistonIds.defaultReturnValue(-1);
+        if (Via.getConfig().isServersideBlockConnections()) {
+            Map<String, Integer> keyToId = ConnectionData.getKeyToId();
+            for (Map.Entry<String, Integer> entry : keyToId.entrySet()) {
+                if (!entry.getKey().contains("piston")) {
+                    continue;
+                }
+
+                addEntries(entry.getKey(), entry.getValue());
+            }
+        } else {
+            ListTag<StringTag> blockStates = MappingDataLoader.INSTANCE.loadNBT("blockstates-1.13.nbt").getListTag("blockstates", StringTag.class);
+            for (int id = 0; id < blockStates.size(); id++) {
+                StringTag state = blockStates.get(id);
+                String key = state.getValue();
+                if (!key.contains("piston")) {
+                    continue;
+                }
+
+                addEntries(key, id);
+            }
+        }
+    }
+
+    // There doesn't seem to be a nicer way around it :(
+    private void addEntries(String data, int id) {
+        id = Protocol1_13To1_12_2.MAPPINGS.getNewBlockStateId(id);
+        pistonIds.put(data, id);
+
+        String substring = data.substring(10);
+        if (!substring.startsWith("piston") && !substring.startsWith("sticky_piston")) return;
+
+        // Swap properties and add them to the map
+        String[] split = data.substring(0, data.length() - 1).split("\\[");
+        String[] properties = split[1].split(",");
+        data = split[0] + "[" + properties[1] + "," + properties[0] + "]";
+        pistonIds.put(data, id);
+    }
+
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        CompoundTag blockState = tag.getCompoundTag("blockState");
+        if (blockState == null) return tag;
+
+        String dataFromTag = getDataFromTag(blockState);
+        if (dataFromTag == null) return tag;
+
+        int id = pistonIds.getInt(dataFromTag);
+        if (id == -1) {
+            //TODO see why this could be null and if this is bad
+            return tag;
+        }
+
+        tag.putInt("blockId", id >> 4);
+        tag.putInt("blockData", id & 15);
+        return tag;
+    }
+
+    // The type hasn't actually been updated in the blockstorage, so we need to construct it
+    private String getDataFromTag(CompoundTag tag) {
+        StringTag name = tag.getStringTag("Name");
+        if (name == null) return null;
+
+        CompoundTag properties = tag.getCompoundTag("Properties");
+        if (properties == null) return name.getValue();
+
+        StringJoiner joiner = new StringJoiner(",", name.getValue() + "[", "]");
+        for (Map.Entry<String, Tag> entry : properties) {
+            if (!(entry.getValue() instanceof StringTag)) continue;
+            joiner.add(entry.getKey() + "=" + ((StringTag) entry.getValue()).getValue());
+        }
+        return joiner.toString();
+    }
+}