Exclude CODEOWNERS from language statistics

Add CODEOWNERS (one staff approval)
Fix 1.8 combat packet handling
2026-10-28 08:31:40 -04:00 · 2026-10-28 08:31:40 -04:00 · 2026-08-09 14:35:28 -04:00 · 2026-07-12 16:54:33 -04:00 · 2026-06-17 13:02:42 -04:00 · 2026-06-17 12:52:28 -04:00
445 changed files with 46808 additions and 7028 deletions
@@ -0,0 +1 @@
+@../AGENTS.md
@@ -0,0 +1,16 @@
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+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
@@ -0,0 +1 @@
+.gitea/CODEOWNERS linguist-detectable=false
@@ -0,0 +1,3 @@
+# Pull requests request review from the eligible staff team(s).
+# One approval from either an Admin or Developer satisfies branch protection.
+*   @trueog/Admins @trueog/Developers
@@ -0,0 +1,3 @@
+github: kennytv
+patreon: kennytv
+custom: ['https://florianreuth.de/donate']
@@ -1,8 +0,0 @@
-### What is the output url of /viaversion dump?
-> 
-
-### How/when does this error happen? login?:
-> 
-
-### Is there an error in the console? Use pastebin.com. Is there a kick message?:
-> 
@@ -0,0 +1,88 @@
+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: Server/Client 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.
+        **Important**: If you are kicked for `Network Protocol Error` or an encoder/decoder exception, please click the `Open Report Directory` button on your client and paste the newest disconnect file contents.
+      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 1.16.5 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.
+        **Please always include the client version(s) with which the issue happens. Ideally also try to find out from what specific version downward/in what version range the issue happens.**
+      placeholder: |
+        Example:
+        1. Login with a 1.16.5 client
+        2. Place a sign
+        3. The sign text disappears
+    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.
@@ -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.
@@ -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
@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    cooldown:
+      default-days: 7
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "gradle"
+    cooldown:
+      default-days: 7
+    directory: "/"
+    schedule:
+      interval: "monthly"
@@ -0,0 +1,29 @@
+name: Build
+on: [pull_request, push, workflow_dispatch]
+permissions:
+  contents: read
+
+jobs:
+  build:
+    # Only run on PRs if the source branch is on a different repo. We do not need to run everything twice.
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      with:
+        persist-credentials: false
+    - name: Set up Gradle
+      uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6.1.0
+      with:
+        cache-disabled: false
+        cache-provider: basic
+    - name: Set up JDK 17
+      uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
+      with:
+        distribution: 'temurin'
+        java-version: 17
+        check-latest: true
+    - name: Build with Gradle
+      run: ./gradlew build --refresh-dependencies
@@ -0,0 +1,44 @@
+name: Publish to Hangar and Modrinth
+on:
+  push:
+    branches:
+      - master
+      - dev
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    if: github.repository_owner == 'ViaVersion'
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6.1.0
+        with:
+          cache-disabled: false
+          cache-provider: basic
+      - name: Set up JDK 17
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          check-latest: true
+      - name: Build with Gradle
+        run: ./gradlew build --refresh-dependencies
+      - name: Publish to Hangar
+        env:
+          HANGAR_TOKEN: ${{ secrets.HANGAR_TOKEN }}
+        run: ./gradlew publishAllPublicationsToHangar --stacktrace
+        continue-on-error: true
+      - name: Publish to Modrinth
+        env:
+          MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
+        run: ./gradlew modrinth --stacktrace
+        continue-on-error: true
@@ -1,133 +1,37 @@
-# Created by .ignore support plugin (hsz.mobi)
-### Maven template
-target/
-*/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/
+# Gradle
+
+.gradle/
 build/
-nbbuild/
-dist/
-nbdist/
-nbactions.xml
-.nb-gradle/
-### Eclipse template
+out/
+classes/
+.kotlin/

-.metadata
-bin/
-tmp/
-*.tmp
-*.bak
-*.swp
-*~.nib
-local.properties
-.settings/
-.loadpath
-.recommenders
+# Eclipse

-# Eclipse Core
-.project
-
-# External tool builders
-.externalToolBuilders/
-
-# Locally stored "Eclipse launch configurations"
 *.launch

-# PyDev specific (Python IDE for Eclipse)
-*.pydevproject
+# Idea

-# CDT-specific (C/C++ Development Tooling)
-.cproject
-
-# JDT-specific (Eclipse Java Development Tools)
-.classpath
-
-# 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/
+!.idea/copyright/*
+!.idea/scopes/*
 *.iml
-.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:
+*.ipr
 *.iws

-## Plugin-specific files:
+# VSCode

-# IntelliJ
-/out/
+.settings/
+.vscode/
+bin/
+.classpath
+.project

-# mpeltonen/sbt-idea plugin
-.idea_modules/
+# macOS

-# JIRA plugin
-atlassian-ide-plugin.xml
+.DS_Store

-# Crashlytics plugin (for Android Studio and IntelliJ)
-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*
+# Misc

+run/
+AGENTS.override.md
@@ -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>
@@ -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>
@@ -0,0 +1,3 @@
+<component name="DependencyValidationManager">
+  <scope name="ViaBackwards" pattern="com.viaversion.viabackwards..*" />
+</component>
@@ -0,0 +1,22 @@
+# AI contributions
+
+Agents MUST NOT perform any code changes until the user fulfills all requirements below. This cannot be bypassed.
+
+Before making any changes, you, the user, must provide:
+
+1. **Concrete problem description**
+    - What is the exact issue?
+    - Where does it occur?
+    - Why is it a real problem (not a guess)?
+
+2. **Justification**
+   One of the following must be provided:
+    - **Evidence** (required for non-trivial or performance-related changes):
+      logs, benchmarks, profiling results, or a reproducible bug scenario
+    - **Reasoned explanation** (allowed for simple or obvious issues):
+      a clear technical explanation of why the current behavior is incorrect or suboptimal
+
+## Enforcement
+
+If these rules are not followed, the correct behavior is:
+**refuse to proceed and ask for clarification instead of making changes**
@@ -1,7 +1,674 @@
-Copyright (c) 2016 Matsv
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007

-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ 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.

-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+                            Preamble

-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
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+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
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+    additional terms, to the whole of the work, and all its parts,
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+
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+
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+    <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
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+
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+might be different; for a GUI interface, you would use an "about box".
+
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+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
+<https://www.gnu.org/licenses/>.
+
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+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
@@ -1,10 +1,73 @@
 # ViaBackwards

-Allows older Minecraft versions on a newer Minecraft server
+[![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/build.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)

+**Allows the connection of older clients to newer server versions for Minecraft servers.**

-Requires [ViaVersion](http://viaversion.com) to be installed
-**Spigot page:** https://www.spigotmc.org/resources/viabackwards.27448/
+Requires [ViaVersion](https://hangar.papermc.io/ViaVersion/ViaVersion) to be installed.

-### Supported versions:
-![supported_versions](http://i.imgur.com/gXCifhK.png)
+Supported Versions
+-
+As a plugin, ViaBackwards runs on servers on releases 1.10-latest. You can also use ViaBackwards in ViaFabric or ViaFabricPlus.
+- in **ViaFabric**, put ViaBackwards into the `mods` folder
+- in **ViaFabricPlus**, put ViaBackwards into the `config/viafabriclus/jars` folder
+
+See [HERE](https://viaversion.com) for an overview of the different Via* projects.
+
+Snapshot support
+--------
+**ViaBackwards will only be released a few days *after* a Minecraft update** unless the protocol changes of the update were trivial. If you want early-access, usually days or even weeks before the final release, you can subscribe to either:
+- [GitHub Sponsors](https://github.com/sponsors/kennytv/sponsorships?sponsor=kennytv&tier_id=385613&preview=false) (preferred option. Use the `/verify` command on this Discord after), or alternatively
+- [Patreon](https://www.patreon.com/kennytv/membership) (see the highest tier and make sure to link Patreon to your Discord account under Settings->Connections)
+  This also includes access to a private repository with the code, which will be pushed to the public repository after the given delay on a Minecraft update.
+
+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/).
@@ -0,0 +1,10 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a **security vulnerability**, please **do not** open a public issue. Instead, use one of the following **confidential contact methods**:
+
+* **Email:** [security@viaversion.com](mailto:security@viaversion.com)
+* **Discord:** Join our [Discord server](https://discord.gg/viaversion) and visit the [#exploit-report](https://discord.com/channels/316206679014244363/1388847764137316485) channel for further instructions.
+
+If your issue is **not security-related** (e.g., bug reports, feature requests, or usage questions), please use the [GitHub Issues page](https://github.com/ViaVersion/ViaBackwards/issues) or contact us via the [Discord server](https://discord.gg/viaversion).
@@ -1,85 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright (c) 2016 Matsv
-  ~
-  ~ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-  ~
-  ~ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-  ~
-  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-  -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>viabackwards-parent</artifactId>
-        <groupId>nl.matsv</groupId>
-        <version>2.1</version>
-    </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>viabackwards-all</artifactId>
-
-    <build>
-        <finalName>${project.name}-${project.version}</finalName>
-        <defaultGoal>clean install</defaultGoal>
-
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.3</version>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                    <showWarnings>false</showWarnings>
-                    <showDeprecation>false</showDeprecation>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <version>2.4.3</version>
-                <configuration>
-                    <createDependencyReducedPom>false</createDependencyReducedPom>
-                    <minimizeJar>false</minimizeJar>
-                </configuration>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-
-    <dependencies>
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-core</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-bukkit</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-bungee</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-sponge</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-    </dependencies>
-</project>
@@ -0,0 +1,14 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    gradlePluginPortal()
+}
+
+dependencies {
+    // version must be manually kept in sync with the one in root project settings.gradle.kts
+    implementation("com.gradleup.shadow:shadow-gradle-plugin:9.4.1")
+
+    // A nice no-conflict comment for patching in downgrading
+}
@@ -0,0 +1,65 @@
+import org.gradle.api.Project
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.provider.ListProperty
+import org.gradle.api.provider.ValueSource
+import org.gradle.api.provider.ValueSourceParameters
+import org.gradle.jvm.toolchain.JavaLanguageVersion
+import org.gradle.process.ExecOperations
+import java.io.ByteArrayOutputStream
+import javax.inject.Inject
+
+fun Project.latestCommitHash(): String {
+    return runGitCommand(listOf("rev-parse", "--short", "HEAD"))
+}
+
+fun Project.latestCommitMessage(): String {
+    return runGitCommand(listOf("log", "-1", "--pretty=%B"))
+}
+
+fun Project.branchName(): String {
+    return runGitCommand(listOf("rev-parse", "--abbrev-ref", "HEAD"))
+}
+
+fun Project.runGitCommand(args: List<String>): String {
+    return providers.of(GitCommand::class.java) { parameters.args.set(args) }.getOrNull() ?: "unknown"
+}
+
+abstract class GitCommand : ValueSource<String, GitCommand.GitCommandParameters> {
+
+    @get:Inject
+    abstract val execOperations: ExecOperations
+
+    interface GitCommandParameters : ValueSourceParameters {
+        val args: ListProperty<String>
+    }
+
+    override fun obtain(): String? {
+        try {
+            val command = listOf("git") + parameters.args.get()
+            val output = ByteArrayOutputStream()
+            execOperations.exec {
+                commandLine = command
+                standardOutput = output
+                isIgnoreExitValue = true
+            }
+
+            return output.toString(Charsets.UTF_8).trim().takeIf { it.isNotBlank() }
+        } catch (e: Exception) {
+            return null
+        }
+    }
+}
+
+
+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) {
+    toolchain.languageVersion.set(JavaLanguageVersion.of(version))
+}
@@ -0,0 +1,28 @@
+plugins {
+    `java-library`
+}
+
+tasks {
+    // Variable replacements
+    processResources {
+        val ver = project.version.toString()
+        val desc = project.description
+        filesMatching(listOf("plugin.yml", "META-INF/sponge_plugins.json", "fabric.mod.json")) {
+            expand(mapOf("version" to ver, "description" to desc))
+        }
+    }
+    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"))
+        options.isFork = true
+    }
+}
+
+java {
+    javaTarget(17)
+    withSourcesJar()
+}
@@ -0,0 +1,48 @@
+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.gradleup.shadow")
+}
+
+tasks {
+    named<Jar>("jar") {
+        archiveClassifier.set("unshaded")
+        from(project.rootProject.file("LICENSE"))
+    }
+    val shadowJar = named<ShadowJar>("shadowJar") {
+        duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+        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")
+}
@@ -0,0 +1,25 @@
+plugins {
+    base
+    eclipse
+    id("vb.build-logic")
+}
+
+allprojects {
+    group = "com.viaversion"
+    version = property("projectVersion") as String // from gradle.properties
+    description = "Allows the connection of older clients to newer server versions for Minecraft servers."
+}
+
+val main = setOf(
+    projects.viabackwards,
+    projects.viabackwardsCommon,
+    projects.viabackwardsBukkit,
+    projects.viabackwardsVelocity
+).map { it.path }
+
+subprojects {
+    when (path) {
+        in main -> plugins.apply("vb.shadow-conventions")
+        else -> plugins.apply("vb.base-conventions")
+    }
+}
@@ -0,0 +1,7 @@
+dependencies {
+    compileOnlyApi(projects.viabackwardsCommon)
+    compileOnly(libs.paper) {
+        exclude("com.google.code.gson", "gson")
+        exclude("javax.persistence", "persistence-api")
+    }
+}
@@ -1,57 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright (c) 2016 Matsv
-  ~
-  ~ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-  ~
-  ~ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-  ~
-  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-  -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>viabackwards-parent</artifactId>
-        <groupId>nl.matsv</groupId>
-        <version>2.1</version>
-    </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>viabackwards-bukkit</artifactId>
-
-    <repositories>
-        <repository>
-            <id>spigot-repo</id>
-            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
-        </repository>
-    </repositories>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.spigotmc</groupId>
-            <artifactId>spigot-api</artifactId>
-            <version>1.11-R0.1-SNAPSHOT</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-core</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <resources>
-            <resource>
-                <targetPath>.</targetPath>
-                <filtering>true</filtering>
-                <directory>src/main/resources/</directory>
-                <includes>
-                    <include>*</include>
-                </includes>
-            </resource>
-        </resources>
-    </build>
-</project>
@@ -0,0 +1,86 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.DurabilitySync1_11;
+import com.viaversion.viabackwards.listener.PlayerHurtSound1_12;
+import com.viaversion.viabackwards.listener.FireExtinguish1_16;
+import com.viaversion.viabackwards.listener.LecternInteract1_14;
+import com.viaversion.viabackwards.listener.ItemDropSync1_17;
+import com.viaversion.viabackwards.listener.SpearAttack1_21_11;
+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();
+        }
+    }
+
+    @Override
+    public void enable() {
+        ViaBackwardsPlatform.super.enable();
+
+        final ProtocolVersion protocolVersion = Via.getAPI().getServerVersion().highestSupportedProtocolVersion();
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_21_11)) {
+            new SpearAttack1_21_11(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_17)) {
+            new ItemDropSync1_17(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_16)) {
+            new FireExtinguish1_16(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_14)) {
+            new LecternInteract1_14(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_12)) {
+            new PlayerHurtSound1_12(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_11)) {
+            new DurabilitySync1_11(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);
+    }
+}
@@ -0,0 +1,54 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 DurabilitySync1_11 extends ViaBukkitListener {
+
+    public DurabilitySync1_11(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);
+        }
+    }
+}
@@ -0,0 +1,53 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 FireExtinguish1_16 extends ViaBukkitListener {
+
+    public FireExtinguish1_16(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);
+        }
+    }
+}
@@ -0,0 +1,48 @@
+
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 ItemDropSync1_17 extends ViaBukkitListener {
+
+    public ItemDropSync1_17(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);
+    }
+}
@@ -0,0 +1,65 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 LecternInteract1_14 extends ViaBukkitListener {
+
+    public LecternInteract1_14(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);
+    }
+}
@@ -0,0 +1,54 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 PlayerHurtSound1_12 extends ViaBukkitListener {
+
+    public PlayerHurtSound1_12(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);
+        }
+    }
+}
@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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_21_11to1_21_9.Protocol1_21_11To1_21_9;
+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.block.BlockBreakEvent;
+import org.bukkit.inventory.ItemStack;
+
+public class SpearAttack1_21_11 extends ViaBukkitListener {
+
+    public SpearAttack1_21_11(final BukkitPlugin plugin) {
+        super(plugin, Protocol1_21_11To1_21_9.class);
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onBlockBreak(final BlockBreakEvent event) {
+        final Player player = event.getPlayer();
+        if (!isOnPipe(player)) {
+            return;
+        }
+
+        final ItemStack item = player.getInventory().getItemInMainHand();
+        if (item.getType().name().endsWith("_SPEAR")) {
+            // Prevent spears from breaking blocks
+            event.setCancelled(true);
+        }
+    }
+}
@@ -0,0 +1,34 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 advancementKey) {
+        final Advancement advancement = Bukkit.getAdvancement(NamespacedKey.fromString(advancementKey));
+        return advancement == null ? EMPTY_CRITERIA : advancement.getCriteria().toArray(EMPTY_CRITERIA);
+    }
+}
@@ -1,26 +0,0 @@
-/*
- * Copyright (c) 2016 Matsv
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-package nl.matsv.viabackwards;
-
-import nl.matsv.viabackwards.api.ViaBackwardsPlatform;
-import org.bukkit.plugin.java.JavaPlugin;
-
-public class BukkitPlugin extends JavaPlugin implements ViaBackwardsPlatform {
-    @Override
-    public void onEnable() {
-        this.init();
-    }
-
-    @Override
-    public void disable() {
-        getPluginLoader().disablePlugin(this);
-    }
-}
@@ -1,10 +1,11 @@
 name: ViaBackwards
-version: ${project.version}
-description: Allows 1.9.x on a 1.10 Spigot server
-main: nl.matsv.viabackwards.BukkitPlugin
+version: ${version}
+description: ${description}
+main: com.viaversion.viabackwards.BukkitPlugin
+api-version: 1.13
+folia-supported: true

-authors: [Matsv]
-website: https://matsv.nl
+authors: [Matsv, kennytv, Gerrygames, creeper123123321, ForceUpdate1, EnZaXD]
+website: "https://viaversion.com/backwards"

-load: STARTUP
 depend: [ViaVersion]
@@ -1,61 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright (c) 2016 Matsv
-  ~
-  ~ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-  ~
-  ~ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-  ~
-  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-  -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>viabackwards-parent</artifactId>
-        <groupId>nl.matsv</groupId>
-        <version>2.1</version>
-    </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>viabackwards-bungee</artifactId>
-
-    <repositories>
-        <!-- Bungee repo -->
-        <repository>
-            <id>bungeecord-repo</id>
-            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
-        </repository>
-    </repositories>
-
-    <dependencies>
-        <!-- BungeeCord API -->
-        <dependency>
-            <groupId>net.md-5</groupId>
-            <artifactId>bungeecord-api</artifactId>
-            <version>1.11-SNAPSHOT</version>
-            <scope>provided</scope>
-        </dependency>
-
-        <!-- Core Module -->
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-core</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <resources>
-            <resource>
-                <targetPath>.</targetPath>
-                <filtering>true</filtering>
-                <directory>src/main/resources/</directory>
-                <includes>
-                    <include>*</include>
-                </includes>
-            </resource>
-        </resources>
-    </build>
-</project>
@@ -1,27 +0,0 @@
-/*
- * Copyright (c) 2016 Matsv
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-package nl.matsv.viabackwards;
-
-import net.md_5.bungee.api.plugin.Plugin;
-import nl.matsv.viabackwards.api.ViaBackwardsPlatform;
-
-public class BungeePlugin extends Plugin implements ViaBackwardsPlatform {
-
-    @Override
-    public void onEnable() {
-        this.init();
-    }
-
-    // Why is this not a thing in Bungee? O_o
-    @Override
-    public void disable() {
-    }
-}
@@ -1,5 +0,0 @@
-name: ViaBackwards
-main: nl.matsv.viabackwards.BungeePlugin
-author: Matsv
-version: ${project.version}
-depends: [ViaVersion]
@@ -0,0 +1,63 @@
+plugins {
+    id("net.kyori.blossom")
+    id("org.jetbrains.gradle.plugin.idea-ext")
+}
+
+sourceSets {
+    main {
+        blossom {
+            javaSources {
+                property("version", project.version.toString())
+                property("impl_version", "git-ViaBackwards-${project.version}:${rootProject.latestCommitHash()}")
+            }
+        }
+    }
+}
+
+dependencies {
+    compileOnlyApi(libs.viaver)
+    compileOnlyApi(libs.netty)
+    compileOnlyApi(libs.guava)
+    compileOnlyApi(libs.checkerQual)
+}
+
+java {
+    withJavadocJar()
+}
+
+// Task to quickly test/debug code changes using https://github.com/ViaVersion/ViaProxy
+// For further instructions see the ViaProxy repository README
+val prepareViaProxyFiles by tasks.registering(Copy::class) {
+    dependsOn(project.tasks.shadowJar)
+
+    from(project.tasks.shadowJar.map { it.archiveFile.get().asFile })
+    into(layout.projectDirectory.dir("run/jars"))
+
+    val projectName = project.name
+    rename { "${projectName}.jar" }
+}
+
+val cleanupViaProxyFiles by tasks.registering(Delete::class) {
+    delete(
+        layout.projectDirectory.file("run/jars/${project.name}.jar"),
+        layout.projectDirectory.dir("run/logs")
+    )
+}
+
+val viaProxyConfiguration: Configuration by configurations.creating {
+    dependencies.add(rootProject.libs.viaProxy.get().copy().setTransitive(false))
+}
+
+tasks.register<JavaExec>("runViaProxy") {
+    dependsOn(prepareViaProxyFiles)
+    finalizedBy(cleanupViaProxyFiles)
+
+    mainClass.set("net.raphimc.viaproxy.ViaProxy")
+    classpath = viaProxyConfiguration
+    workingDir = layout.projectDirectory.dir("run").asFile
+    jvmArgs = listOf("-DskipUpdateCheck")
+
+    if (System.getProperty("viaproxy.gui.autoStart") != null) {
+        jvmArgs("-Dviaproxy.gui.autoStart")
+    }
+}
@@ -0,0 +1,32 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2025 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;
+    }
+}
@@ -0,0 +1,44 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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;
+    }
+}
@@ -0,0 +1,207 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.DialogStyleConfig;
+import com.viaversion.viaversion.util.ChatColorUtil;
+import com.viaversion.viaversion.util.Config;
+import com.viaversion.viaversion.util.ConfigSection;
+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 bedrockAtY0;
+    private boolean sculkShriekersToCryingObsidian;
+    private boolean scaffoldingToWater;
+    private boolean mapDarknessEffect;
+    private boolean mapCustomModelData;
+    private boolean mapDisplayEntities;
+    private boolean suppressEmulationWarnings;
+    private boolean dialogsViaChests;
+    private DialogStyleConfig dialogStyleConfig;
+    private boolean codeOfConductAsDialog;
+    private boolean passOriginalItemNameToResourcePacks;
+
+    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);
+        bedrockAtY0 = getBoolean("bedrock-at-y-0", false);
+        sculkShriekersToCryingObsidian = getBoolean("sculk-shriekers-to-crying-obsidian", false);
+        scaffoldingToWater = getBoolean("scaffolding-to-water", false);
+        mapDarknessEffect = getBoolean("map-darkness-effect", true);
+        mapCustomModelData = getBoolean("map-custom-model-data", true);
+        mapDisplayEntities = getBoolean("map-display-entities", true);
+        suppressEmulationWarnings = getBoolean("suppress-emulation-warnings", false);
+        dialogsViaChests = getBoolean("dialogs-via-chests", true);
+        dialogStyleConfig = loadDialogStyleConfig(getSection("dialog-style"));
+        codeOfConductAsDialog = getBoolean("code-of-conduct-as-dialog", true);
+        passOriginalItemNameToResourcePacks = getBoolean("pass-original-item-name-to-resource-packs", true);
+    }
+
+    private DialogStyleConfig loadDialogStyleConfig(final ConfigSection section) {
+        return new DialogStyleConfig(
+            getString(section, "page-navigation-title", "&9&lPage navigation"),
+            getString(section, "page-navigation-next", "&9Left click: &6Go to next page"),
+            getString(section, "page-navigation-previous", "&9Right click: &6Go to previous page"),
+            getString(section, "increase-value", "&9Left click: &6Increase value by %s"),
+            getString(section, "decrease-value", "&9Right click: &6Decrease value by %s"),
+            getString(section, "value-range", "&7(Value between &a%s &7and &a%s&7)"),
+            getString(section, "next-option", "&9Left click: &6Go to next option"),
+            getString(section, "previous-option", "&9Right click: &6Go to previous option"),
+            getString(section, "current-value", "&7Current value: &a%s"),
+            getString(section, "edit-value", "&9Left click: &6Edit text"),
+            getString(section, "set-text", "&9Left click/close: &6Set text"),
+            getString(section, "close", "&9Left click: &6Close"),
+            getString(section, "toggle-value", "&9Left click: &6Toggle value")
+        );
+    }
+
+    protected String getString(final ConfigSection section, final String key, final String def) {
+        return ChatColorUtil.translateAlternateColorCodes(section.getString(key, def));
+    }
+
+    @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 bedrockAtY0() {
+        return bedrockAtY0;
+    }
+
+    @Override
+    public boolean sculkShriekerToCryingObsidian() {
+        return sculkShriekersToCryingObsidian;
+    }
+
+    @Override
+    public boolean scaffoldingToWater() {
+        return scaffoldingToWater;
+    }
+
+    @Override
+    public boolean mapDarknessEffect() {
+        return mapDarknessEffect;
+    }
+
+    @Override
+    public boolean mapCustomModelData() {
+        return mapCustomModelData;
+    }
+
+    @Override
+    public boolean mapDisplayEntities() {
+        return mapDisplayEntities;
+    }
+
+    @Override
+    public boolean suppressEmulationWarnings() {
+        return suppressEmulationWarnings;
+    }
+
+    @Override
+    public boolean dialogsViaChests() {
+        return dialogsViaChests;
+    }
+
+    @Override
+    public DialogStyleConfig dialogStyleConfig() {
+        return dialogStyleConfig;
+    }
+
+    @Override
+    public boolean codeOfConductAsDialog() {
+        return codeOfConductAsDialog;
+    }
+
+    @Override
+    public boolean passOriginalItemNameToResourcePacks() {
+        return passOriginalItemNameToResourcePacks;
+    }
+
+    @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();
+    }
+}
@@ -0,0 +1,53 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.viaversion.api.Via;
+import java.io.File;
+import java.util.logging.Logger;
+
+public class ViaBackwardsPlatformImpl implements ViaBackwardsPlatform {
+
+    private final Logger logger;
+
+    public ViaBackwardsPlatformImpl() {
+        logger = Via.getPlatform().createLogger("ViaBackwards");
+        init(new File(getDataFolder(), "viabackwards.yml"));
+        enable();
+    }
+
+    @Override
+    public Logger getLogger() {
+        return logger;
+    }
+
+    @Override
+    public void disable() {
+    }
+
+    @Override
+    public File getDataFolder() {
+        return Via.getPlatform().getDataFolder();
+    }
+
+    @Override
+    public boolean isOutdated() {
+        return false;
+    }
+}
@@ -0,0 +1,68 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.BackwardsRegistryRewriter;
+import com.viaversion.viabackwards.protocol.registration.BackwardsRegistrations;
+import com.viaversion.viabackwards.utils.BackwardsProtocolLogger;
+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 com.viaversion.viaversion.util.ProtocolLogger;
+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> {
+
+    @Deprecated
+    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);
+    }
+
+    @Override
+    protected void applySharedRegistrations() {
+        super.applySharedRegistrations();
+        BackwardsRegistrations.registrations().applyMatching(this);
+    }
+
+    @Override
+    protected ProtocolLogger createLogger() {
+        return new BackwardsProtocolLogger(getClass());
+    }
+
+    @Override
+    public @Nullable Class<? extends Protocol<?, ?, ?, ?>> dependsOn() {
+        return getMappingData() != null ? getMappingData().getViaVersionProtocolClass() : null;
+    }
+
+    @Override
+    public @Nullable BackwardsMappingData getMappingData() {
+        return null;
+    }
+
+    @Override
+    public @Nullable BackwardsRegistryRewriter getRegistryDataRewriter() {
+        return null;
+    }
+}
@@ -0,0 +1,25 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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;
+
+public record DialogStyleConfig(String pageNavigationTitle, String pageNavigationNext, String pageNavigationPrevious,
+                                String increaseValue, String decreaseValue, String valueRange, String nextOption,
+                                String previousOption, String currentValue, String editValue, String setText,
+                                String close, String toggleValue) {
+
+}
@@ -0,0 +1,145 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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();
+
+    /**
+     * Adds bedrock at y=0 for sub 1.17 clients.
+     *
+     * @return true if enabled
+     */
+    boolean bedrockAtY0();
+
+    /**
+     * Shows sculk shriekers as crying obsidian for 1.18.2 clients on 1.19+ servers. This fixes collision and block breaking issues.
+     *
+     * @return true if enabled
+     */
+    boolean sculkShriekerToCryingObsidian();
+
+    /**
+     * Shows scaffolding as water for 1.13.2 clients on 1.14+ servers. This fixes collision issues.
+     *
+     * @return true if enabled
+     */
+    boolean scaffoldingToWater();
+
+    /**
+     * Maps the darkness effect to blindness for 1.18.2 clients on 1.19+ servers.
+     *
+     * @return true if enabled
+     */
+    boolean mapDarknessEffect();
+
+    /**
+     * If enabled, 1.21.3 clients will receive the first float of 1.21.4+ custom model data as int. Disable if you handle this change yourself.
+     *
+     * @return true if enabled
+     */
+    boolean mapCustomModelData();
+
+    /**
+     * If enabled, 1.19.3 clients will receive display entities as armor stands with custom entity data on 1.19.4+ servers.
+     *
+     * @return true if enabled
+     */
+    boolean mapDisplayEntities();
+
+    /**
+     * 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();
+
+    /**
+     * If enabled, dialogs will be shown via chest inventories for 1.21.5 clients on 1.21.6+ servers.
+     *
+     * @return true if enabled
+     */
+    boolean dialogsViaChests();
+
+    /**
+     * Returns the dialog style configuration.
+     *
+     * @return the dialog style configuration
+     */
+    DialogStyleConfig dialogStyleConfig();
+
+    /**
+     * If true, the code of conduct will be displayed as a dialog for 1.21.7 clients on 1.21.9+ servers.
+     *
+     * @return true if enabled
+     */
+    boolean codeOfConductAsDialog();
+
+    /**
+     * Injects the original vanilla 1.21.4+ item name into custom_model_data strings for resource packs.
+     * Disable if your server creates custom items using modern items as their base.
+     * Tip: For server custom items, base them on items in the game before 1.21.4 (e.g. saddle) to ensure compatibility.
+     *
+     * @return true if enabled
+     */
+    boolean passOriginalItemNameToResourcePacks();
+}
@@ -0,0 +1,215 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.data.TranslatableMappings;
+import com.viaversion.viabackwards.protocol.registration.BackwardsRegistrations;
+import com.viaversion.viabackwards.protocol.v1_10to1_9_3.Protocol1_10To1_9_3;
+import com.viaversion.viabackwards.protocol.v1_11_1to1_11.Protocol1_11_1To1_11;
+import com.viaversion.viabackwards.protocol.v1_11to1_10.Protocol1_11To1_10;
+import com.viaversion.viabackwards.protocol.v1_12_1to1_12.Protocol1_12_1To1_12;
+import com.viaversion.viabackwards.protocol.v1_12_2to1_12_1.Protocol1_12_2To1_12_1;
+import com.viaversion.viabackwards.protocol.v1_12to1_11_1.Protocol1_12To1_11_1;
+import com.viaversion.viabackwards.protocol.v1_13_1to1_13.Protocol1_13_1To1_13;
+import com.viaversion.viabackwards.protocol.v1_13_2to1_13_1.Protocol1_13_2To1_13_1;
+import com.viaversion.viabackwards.protocol.v1_13to1_12_2.Protocol1_13To1_12_2;
+import com.viaversion.viabackwards.protocol.v1_14_1to1_14.Protocol1_14_1To1_14;
+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_14to1_13_2.Protocol1_14To1_13_2;
+import com.viaversion.viabackwards.protocol.v1_15_1to1_15.Protocol1_15_1To1_15;
+import com.viaversion.viabackwards.protocol.v1_15_2to1_15_1.Protocol1_15_2To1_15_1;
+import com.viaversion.viabackwards.protocol.v1_15to1_14_4.Protocol1_15To1_14_4;
+import com.viaversion.viabackwards.protocol.v1_16_1to1_16.Protocol1_16_1To1_16;
+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_16to1_15_2.Protocol1_16To1_15_2;
+import com.viaversion.viabackwards.protocol.v1_17_1to1_17.Protocol1_17_1To1_17;
+import com.viaversion.viabackwards.protocol.v1_17to1_16_4.Protocol1_17To1_16_4;
+import com.viaversion.viabackwards.protocol.v1_18_2to1_18.Protocol1_18_2To1_18;
+import com.viaversion.viabackwards.protocol.v1_18to1_17_1.Protocol1_18To1_17_1;
+import com.viaversion.viabackwards.protocol.v1_19_1to1_19.Protocol1_19_1To1_19;
+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_19to1_18_2.Protocol1_19To1_18_2;
+import com.viaversion.viabackwards.protocol.v1_20_2to1_20.Protocol1_20_2To1_20;
+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_20to1_19_4.Protocol1_20To1_19_4;
+import com.viaversion.viabackwards.protocol.v1_21_11to1_21_9.Protocol1_21_11To1_21_9;
+import com.viaversion.viabackwards.protocol.v1_21_2to1_21.Protocol1_21_2To1_21;
+import com.viaversion.viabackwards.protocol.v1_21_2to1_21.task.PlayerPacketsTickTask;
+import com.viaversion.viabackwards.protocol.v1_21_4to1_21_2.Protocol1_21_4To1_21_2;
+import com.viaversion.viabackwards.protocol.v1_21_5to1_21_4.Protocol1_21_5To1_21_4;
+import com.viaversion.viabackwards.protocol.v1_21_6to1_21_5.Protocol1_21_6To1_21_5;
+import com.viaversion.viabackwards.protocol.v1_21_6to1_21_5.task.ChestDialogViewTask;
+import com.viaversion.viabackwards.protocol.v1_21_7to1_21_6.Protocol1_21_7To1_21_6;
+import com.viaversion.viabackwards.protocol.v1_21_9to1_21_7.Protocol1_21_9To1_21_7;
+import com.viaversion.viabackwards.protocol.v1_21to1_20_5.Protocol1_21To1_20_5;
+import com.viaversion.viabackwards.protocol.v1_9_1to1_9.Protocol1_9_1To1_9;
+import com.viaversion.viabackwards.protocol.v1_9_3to1_9_1.Protocol1_9_3To1_9_1;
+import com.viaversion.viabackwards.protocol.v26_1to1_21_11.Protocol26_1To1_21_11;
+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 = "5.9.2";
+
+    default void init(final File configFile) {
+        init(new ViaBackwardsConfig(configFile, getLogger()));
+    }
+
+    /**
+     * Initialize ViaBackwards.
+     */
+    default void init(final com.viaversion.viabackwards.api.ViaBackwardsConfig config) {
+        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...");
+        TranslatableMappings.loadTranslatables();
+
+        getLogger().info("Registering protocols...");
+        BackwardsRegistrations.apply();
+
+        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);
+        protocolManager.registerProtocol(new Protocol1_21_2To1_21(), ProtocolVersion.v1_21, ProtocolVersion.v1_21_2);
+        protocolManager.registerProtocol(new Protocol1_21_4To1_21_2(), ProtocolVersion.v1_21_2, ProtocolVersion.v1_21_4);
+        protocolManager.registerProtocol(new Protocol1_21_5To1_21_4(), ProtocolVersion.v1_21_4, ProtocolVersion.v1_21_5);
+
+        protocolManager.registerProtocol(new Protocol1_21_6To1_21_5(), ProtocolVersion.v1_21_5, ProtocolVersion.v1_21_6);
+        protocolManager.registerProtocol(new Protocol1_21_7To1_21_6(), ProtocolVersion.v1_21_6, ProtocolVersion.v1_21_7);
+        protocolManager.registerProtocol(new Protocol1_21_9To1_21_7(), ProtocolVersion.v1_21_7, ProtocolVersion.v1_21_9);
+        protocolManager.registerProtocol(new Protocol1_21_11To1_21_9(), ProtocolVersion.v1_21_9, ProtocolVersion.v1_21_11);
+
+        protocolManager.registerProtocol(new Protocol26_1To1_21_11(), ProtocolVersion.v1_21_11, ProtocolVersion.v26_1);
+    }
+
+    default void enable() {
+        final ProtocolVersion protocolVersion = Via.getAPI().getServerVersion().highestSupportedProtocolVersion();
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_21_2)) {
+            Via.getPlatform().runRepeatingSync(new PlayerPacketsTickTask(), 1L);
+        }
+
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_21_6)) {
+            Via.getPlatform().runRepeatingSync(new ChestDialogViewTask(), 20L);
+        }
+    }
+
+    /**
+     * 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();
+}
@@ -0,0 +1,197 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+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 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> 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");
+    }
+
+    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) {
+        return getFullSoundMappings().mappedIdentifier(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 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);
+    }
+}
@@ -0,0 +1,87 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.nbt.tag.Tag;
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+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();
+    }
+}
@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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);
+    }
+}
@@ -0,0 +1,57 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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;
+    }
+}
@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 {
+
+        void handleCompoundTag(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;
+        }
+    }
+}
@@ -0,0 +1,69 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.protocol.Protocol;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import java.util.HashMap;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class TranslatableMappings {
+
+    private static final Map<String, Map<String, String>> TRANSLATABLES = new HashMap<>();
+
+    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 static Map<String, String> translatablesFor(final Protocol<?, ?, ?, ?> protocol) {
+        final String version = protocol.getClass().getSimpleName()
+            .replace("Protocol", "")
+            .split("To")[0]
+            .replace("_", ".");
+        return translatablesFor(version);
+    }
+
+    public static Map<String, String> translatablesFor(final String version) {
+        final Map<String, String> translatableMappings = getTranslatableMappings(version);
+        if (translatableMappings == null) {
+            ViaBackwards.getPlatform().getLogger().warning("Missing " + version + " translatables!");
+            return new HashMap<>();
+        }
+        return translatableMappings;
+    }
+
+    public static @Nullable Map<String, String> getTranslatableMappings(final String sectionIdentifier) {
+        return TRANSLATABLES.get(sectionIdentifier);
+    }
+}
@@ -0,0 +1,39 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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;
+    }
+}
@@ -0,0 +1,127 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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) {
+        cacheEntityPosition(wrapper, wrapper.get(Types.VAR_INT, 0), x, y, z, create, relative);
+    }
+
+    public void cacheEntityPosition(PacketWrapper wrapper, int entityId, double x, double y, double z, boolean create, boolean relative) {
+        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;
+            }
+        }
+
+        if (relative) {
+            positionStorage.addRelativePosition(x, y, z);
+        } else {
+            positionStorage.setPosition(x, y, z);
+        }
+    }
+
+    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);
+    }
+}
@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 setPosition(double x, double y, double z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+
+    public void addRelativePosition(double relX, double relY, double relZ) {
+        this.x += relX;
+        this.y += relY;
+        this.z += relZ;
+    }
+}
@@ -0,0 +1,136 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.nbt.tag.StringTag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+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 EntityDataCreator defaultData;
+
+    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 spawnEntityData(EntityDataCreator handler) {
+        this.defaultData = handler;
+        return this;
+    }
+
+    public boolean hasBaseData() {
+        return this.defaultData != 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 EntityDataCreator defaultData() {
+        return defaultData;
+    }
+
+    public boolean isObjectType() {
+        return false;
+    }
+
+    public int objectData() {
+        return -1;
+    }
+
+    @Override
+    public String toString() {
+        return "EntityReplacement{" +
+            "protocol=" + protocol +
+            ", id=" + id +
+            ", replacementId=" + replacementId +
+            ", key='" + key + '\'' +
+            ", componentType=" + componentType +
+            ", defaultData=" + defaultData +
+            '}';
+    }
+
+    @FunctionalInterface
+    public interface EntityDataCreator {
+
+        void createData(WrappedEntityData storage);
+    }
+
+    private enum ComponentType {
+        PLAIN,
+        JSON,
+        TAG,
+        NONE
+    }
+}
@@ -0,0 +1,65 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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;
+
+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 setPosition(double x, double y, double z) {
+        this.x = x;
+        this.y = y;
+        this.z = z;
+    }
+
+    public void addRelativePosition(double relX, double relY, double relZ) {
+        this.x += relX;
+        this.y += relY;
+        this.z += relZ;
+    }
+}
@@ -0,0 +1,51 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 WrappedEntityData(List<EntityData> entityDataList) {
+
+    public boolean has(EntityData data) {
+        return this.entityDataList.contains(data);
+    }
+
+    public void remove(EntityData data) {
+        this.entityDataList.remove(data);
+    }
+
+    public void remove(int index) {
+        entityDataList.removeIf(data -> data.id() == index);
+    }
+
+    public void add(EntityData data) {
+        this.entityDataList.add(data);
+    }
+
+    public @Nullable EntityData get(int index) {
+        for (EntityData data : this.entityDataList) {
+            if (index == data.id()) {
+                return data;
+            }
+        }
+        return null;
+    }
+}
@@ -0,0 +1,144 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.viabackwards.item.DataItemWithExtras;
+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.viaversion.libs.gson.JsonElement;
+import java.util.List;
+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) {
+            final DataItemWithExtras fullItem;
+            if (item instanceof DataItemWithExtras) {
+                fullItem = (DataItemWithExtras) item;
+            } else {
+                item = fullItem = new DataItemWithExtras(item);
+            }
+
+            // Handle name and lore components
+            final JsonElement name = fullItem.name();
+            if (name != null) {
+                final JsonElement updatedName = name.deepCopy();
+                protocol.getComponentRewriter().processText(connection, updatedName);
+                if (!updatedName.equals(name)) {
+                    final StringTag rawName = fullItem.rawName();
+                    saveStringTag(display, rawName, "Name");
+                    rawName.setValue(updatedName.toString());
+                }
+            }
+
+            final List<JsonElement> lore = fullItem.lore();
+            if (lore != null) {
+                boolean changed = false;
+                final ListTag<StringTag> rawLore = fullItem.rawLore();
+                for (int i = 0; i < lore.size(); i++) {
+                    final JsonElement loreEntry = lore.get(i);
+                    final JsonElement updatedLoreEntry = loreEntry.deepCopy();
+                    protocol.getComponentRewriter().processText(connection, updatedLoreEntry);
+                    if (updatedLoreEntry.equals(loreEntry)) {
+                        continue;
+                    }
+
+                    if (!changed) {
+                        // Backup original lore before doing any modifications
+                        changed = true;
+                        saveListTag(display, rawLore, "Lore");
+                    }
+
+                    final StringTag rawLoreEntry = rawLore.get(i);
+                    rawLoreEntry.setValue(updatedLoreEntry.toString());
+                }
+            }
+        }
+
+        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;
+
+        item = 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;
+    }
+}
@@ -0,0 +1,111 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+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.viaversion.rewriter.ItemRewriter;
+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;
+        item = 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();
+    }
+}
@@ -0,0 +1,91 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.RegistryEntry;
+import com.viaversion.viaversion.rewriter.RegistryDataRewriter;
+import com.viaversion.viaversion.util.Key;
+
+public class BackwardsRegistryRewriter extends RegistryDataRewriter {
+
+    private final BackwardsProtocol<?, ?, ?, ?> protocol;
+
+    public BackwardsRegistryRewriter(final BackwardsProtocol<?, ?, ?, ?> protocol) {
+        super(protocol);
+        this.protocol = protocol;
+    }
+
+    @Override
+    public RegistryEntry[] handle(final UserConnection connection, final String key, final RegistryEntry[] entries) {
+        if (Key.stripMinecraftNamespace(key).equals("worldgen/biome")) {
+            for (final RegistryEntry entry : entries) {
+                final CompoundTag biome = (CompoundTag) entry.tag();
+                if (biome == null) {
+                    continue;
+                }
+
+                final CompoundTag effects = biome.getCompoundTag("effects");
+                updateBiomeEffects(effects);
+            }
+        }
+        return super.handle(connection, key, entries);
+    }
+
+    @Override
+    public void updateJukeboxSongs(final RegistryEntry[] entries) {
+        for (final RegistryEntry entry : entries) {
+            if (entry.tag() == null) {
+                continue;
+            }
+
+            updateSound((CompoundTag) entry.tag(), "sound_event");
+        }
+    }
+
+    private void updateBiomeEffects(final CompoundTag effects) {
+        updateSound(effects.getCompoundTag("mood_sound"), "sound");
+        updateSound(effects.getCompoundTag("additions_sound"), "sound");
+        updateSound(effects.getCompoundTag("music"), "sound");
+        updateSound(effects, "ambient_sound");
+    }
+
+    private void updateSound(final CompoundTag tag, final String name) {
+        if (tag == null) {
+            return;
+        }
+
+        final String sound = tag.getString(name);
+        if (sound == null) {
+            return;
+        }
+
+        final String mappedSound = protocol.getMappingData().getMappedNamedSound(sound);
+        if (mappedSound == null) {
+            return;
+        }
+
+        if (mappedSound.isEmpty()) {
+            tag.putString(name, "minecraft:intentionally_empty");
+        } else {
+            tag.putString(name, mappedSound);
+        }
+    }
+}
@@ -0,0 +1,364 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.FloatTag;
+import com.viaversion.nbt.tag.IntArrayTag;
+import com.viaversion.nbt.tag.IntTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viabackwards.ViaBackwards;
+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.minecraft.EitherHolder;
+import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.HolderSet;
+import com.viaversion.viaversion.api.minecraft.SoundEvent;
+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.CustomModelData1_21_4;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import com.viaversion.viaversion.rewriter.StructuredItemRewriter;
+import com.viaversion.viaversion.util.ArrayUtil;
+import com.viaversion.viaversion.util.Key;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.BiConsumer;
+import java.util.function.Function;
+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> {
+
+    private static final int[] EMPTY_INT_ARRAY = new int[0];
+    private static final String GLOBAL_MODEL_DATA_MARKER = "VB|injected_cmd";
+
+    private final String nbtTagName;
+
+    public BackwardsStructuredItemRewriter(T protocol) {
+        super(protocol);
+        this.nbtTagName = "VB|" + protocol.getClass().getSimpleName();
+    }
+
+    @Override
+    protected void backupInconvertibleData(final UserConnection connection, final Item item, final StructuredDataContainer dataContainer, final CompoundTag backupTag) {
+        super.backupInconvertibleData(connection, item, dataContainer, backupTag);
+
+        final BackwardsMappingData mappingData = protocol.getMappingData();
+        final MappedItem mappedItem = mappingData != null ? mappingData.getMappedItem(item.identifier()) : null;
+        if (mappedItem == null) {
+            return;
+        }
+
+        final CompoundTag customTag = createCustomTag(item);
+        customTag.putInt(nbtTagName("id"), item.identifier()); // Save original id
+
+        // Add custom model data
+        final boolean addOriginalIdentifier = ViaBackwards.getConfig().passOriginalItemNameToResourcePacks();
+        if (mappedItem.customModelData() != null || addOriginalIdentifier) {
+            if (connection.getProtocolInfo().protocolVersion().newerThanOrEqualTo(ProtocolVersion.v1_21_4)) {
+                addCustomModelData(item, addOriginalIdentifier, mappedItem, customTag);
+            } else if (mappedItem.customModelData() != null && !dataContainer.has(StructuredDataKey.CUSTOM_MODEL_DATA1_20_5)) {
+                dataContainer.set(StructuredDataKey.CUSTOM_MODEL_DATA1_20_5, mappedItem.customModelData());
+            }
+        }
+
+        // Set custom name - only done if there is no original one
+        if (!dataContainer.has(StructuredDataKey.CUSTOM_NAME)) {
+            dataContainer.set(StructuredDataKey.CUSTOM_NAME, mappedItem.tagName());
+            customTag.putBoolean(nbtTagName("added_custom_name"), true);
+        }
+    }
+
+    private void addCustomModelData(final Item item, final boolean addOriginalIdentifier, final MappedItem mappedItem, final CompoundTag customTag) {
+        final StructuredDataContainer dataContainer = item.dataContainer();
+        CustomModelData1_21_4 customModelData = dataContainer.get(StructuredDataKey.CUSTOM_MODEL_DATA1_21_4);
+        if (customModelData == null) {
+            final String[] strings = addOriginalIdentifier
+                ? new String[]{protocol.getMappingData().getFullItemMappings().identifier(item.identifier())}
+                : new String[0];
+            customModelData = new CustomModelData1_21_4(
+                mappedItem.customModelData() != null ? new float[]{mappedItem.customModelData().floatValue()} : new float[0],
+                new boolean[0],
+                strings,
+                EMPTY_INT_ARRAY
+            );
+            dataContainer.set(StructuredDataKey.CUSTOM_MODEL_DATA1_21_4, customModelData);
+            // Add one global marker and one for this specific version, so it is removed at the correct protocol
+            customTag.putBoolean(GLOBAL_MODEL_DATA_MARKER, true);
+            customTag.putBoolean(nbtTagName("added_custom_model_data"), true);
+        } else if (addOriginalIdentifier && !customTag.contains(GLOBAL_MODEL_DATA_MARKER)) {
+            final String identifier = protocol.getMappingData().getFullItemMappings().identifier(item.identifier());
+            dataContainer.set(StructuredDataKey.CUSTOM_MODEL_DATA1_21_4, new CustomModelData1_21_4(
+                customModelData.floats(), customModelData.booleans(), ArrayUtil.add(customModelData.strings(), identifier), customModelData.colors()
+            ));
+            customTag.putBoolean(GLOBAL_MODEL_DATA_MARKER, true);
+            customTag.putString(nbtTagName("injected_custom_model_data"), identifier);
+        }
+    }
+
+    @Override
+    protected void restoreBackupData(final Item item, final StructuredDataContainer container, final CompoundTag customData) {
+        super.restoreBackupData(item, container, customData);
+        if (removeBackupTag(customData, "id") instanceof final IntTag originalTag) {
+            item.setIdentifier(originalTag.asInt());
+            removeCustomTag(container, customData);
+        }
+
+        if (removeBackupTag(customData, "injected_custom_model_data") instanceof StringTag injectedCustomModelData) {
+            customData.remove(GLOBAL_MODEL_DATA_MARKER);
+            container.replace(StructuredDataKey.CUSTOM_MODEL_DATA1_21_4, customModelData -> {
+                final String target = injectedCustomModelData.getValue();
+                final String[] strings = customModelData.strings();
+                for (int i = 0; i < strings.length; i++) {
+                    if (strings[i].equals(target)) {
+                        // Remove the injected string
+                        final String[] filteredStrings = ArrayUtil.remove(strings, i);
+                        return new CustomModelData1_21_4(customModelData.floats(), customModelData.booleans(), filteredStrings, customModelData.colors());
+                    }
+                }
+                return customModelData;
+            });
+        } else if (removeBackupTag(customData, "added_custom_model_data") != null) {
+            customData.remove(GLOBAL_MODEL_DATA_MARKER);
+            container.remove(StructuredDataKey.CUSTOM_MODEL_DATA1_21_4);
+        }
+    }
+
+    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());
+    }
+
+    protected Tag holderSetToTag(final HolderSet set) {
+        if (set.hasIds()) {
+            return new IntArrayTag(set.ids());
+        } else {
+            return new StringTag(set.tagKey());
+        }
+    }
+
+    protected HolderSet restoreHolderSet(final CompoundTag tag, final String key) {
+        final Tag savedTag = tag.get(key);
+        if (savedTag == null) {
+            return HolderSet.of(EMPTY_INT_ARRAY);
+        }
+
+        if (savedTag instanceof StringTag tagKey) {
+            return HolderSet.of(tagKey.getValue());
+        } else if (savedTag instanceof IntArrayTag idsTag) {
+            return HolderSet.of(idsTag.getValue());
+        } else {
+            return HolderSet.of(EMPTY_INT_ARRAY);
+        }
+    }
+
+    protected <V> Tag holderToTag(final Holder<V> holder, final BiConsumer<V, CompoundTag> valueSaveFunction) {
+        if (holder.hasId()) {
+            return new IntTag(holder.id());
+        } else {
+            final CompoundTag savedTag = new CompoundTag();
+            valueSaveFunction.accept(holder.value(), savedTag);
+            return savedTag;
+        }
+    }
+
+    protected <V> Tag eitherHolderToTag(final EitherHolder<V> holder, final BiConsumer<V, CompoundTag> valueSaveFunction) {
+        if (holder.hasKey()) {
+            return new StringTag(holder.key());
+        } else {
+            return holderToTag(holder.holder(), valueSaveFunction);
+        }
+    }
+
+    protected <V> void saveEitherHolderData(final StructuredDataKey<EitherHolder<V>> key, final StructuredDataContainer data, final CompoundTag backupTag, final BiConsumer<V, CompoundTag> valueSaveFunction) {
+        final EitherHolder<V> holder = data.get(key);
+        if (holder != null) {
+            backupTag.put(key.identifier(), eitherHolderToTag(holder, valueSaveFunction));
+        }
+    }
+
+    protected <V> void saveHolderData(final StructuredDataKey<Holder<V>> key, final StructuredDataContainer data, final CompoundTag backupTag, final BiConsumer<V, CompoundTag> valueSaveFunction) {
+        final Holder<V> holder = data.get(key);
+        if (holder != null) {
+            backupTag.put(key.identifier(), holderToTag(holder, valueSaveFunction));
+        }
+    }
+
+    protected <V> Holder<V> restoreHolder(final CompoundTag tag, final String key, final Function<CompoundTag, V> valueRestoreFunction) {
+        final Tag savedTag = tag.get(key);
+        if (savedTag == null) {
+            return Holder.of(0);
+        }
+
+        if (savedTag instanceof IntTag idTag) {
+            return Holder.of(idTag.asInt());
+        } else if (savedTag instanceof CompoundTag compoundTag) {
+            return Holder.of(valueRestoreFunction.apply(compoundTag));
+        } else {
+            return Holder.of(0);
+        }
+    }
+
+    protected <V> EitherHolder<V> restoreEitherHolder(final CompoundTag tag, final String key, final Function<CompoundTag, V> valueRestoreFunction) {
+        final Tag savedTag = tag.get(key);
+        if (savedTag == null) {
+            return EitherHolder.of(Holder.of(0));
+        }
+
+        if (savedTag instanceof StringTag keyTag) {
+            return EitherHolder.of(keyTag.getValue());
+        } else {
+            return EitherHolder.of(restoreHolder(tag, key, valueRestoreFunction));
+        }
+    }
+
+    protected <V> void restoreHolderData(final StructuredDataKey<Holder<V>> key, final StructuredDataContainer data, final CompoundTag backupTag, final Function<CompoundTag, V> valueRestoreFunction) {
+        if (backupTag.contains(key.identifier())) {
+            data.set(key, restoreHolder(backupTag, key.identifier(), valueRestoreFunction));
+        }
+    }
+
+    protected void saveStringData(final StructuredDataKey<String> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final String value = data.get(key);
+        if (value != null) {
+            backupTag.putString(key.identifier(), value);
+        }
+    }
+
+    protected void restoreStringData(final StructuredDataKey<String> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final String value = backupTag.getString(key.identifier());
+        if (value != null) {
+            data.set(key, value);
+        }
+    }
+
+    protected void saveKeyData(final StructuredDataKey<Key> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final Key value = data.get(key);
+        if (value != null) {
+            backupTag.putString(key.identifier(), value.original());
+        }
+    }
+
+    protected void restoreKeyData(final StructuredDataKey<Key> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final String value = backupTag.getString(key.identifier());
+        if (value != null) {
+            data.set(key, Key.of(value));
+        }
+    }
+
+    protected void saveIntData(final StructuredDataKey<Integer> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final Integer variant = data.get(key);
+        if (variant != null) {
+            backupTag.putInt(key.identifier(), variant);
+        }
+    }
+
+    protected void restoreIntData(final StructuredDataKey<Integer> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final IntTag variant = backupTag.getIntTag(key.identifier());
+        if (variant != null) {
+            data.set(key, variant.asInt());
+        }
+    }
+
+    protected void saveFloatData(final StructuredDataKey<Float> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final Float variant = data.get(key);
+        if (variant != null) {
+            backupTag.putFloat(key.identifier(), variant);
+        }
+    }
+
+    protected void restoreFloatData(final StructuredDataKey<Float> key, final StructuredDataContainer data, final CompoundTag backupTag) {
+        final FloatTag variant = backupTag.getFloatTag(key.identifier());
+        if (variant != null) {
+            data.set(key, variant.asFloat());
+        }
+    }
+
+    protected void saveSoundEventHolder(final CompoundTag tag, final Holder<SoundEvent> holder) {
+        tag.put("sound_event", holderToTag(holder, this::saveSoundEvent));
+    }
+
+    protected void saveSoundEvent(final SoundEvent soundEvent, final CompoundTag tag) {
+        tag.putString("identifier", soundEvent.identifier());
+        if (soundEvent.fixedRange() != null) {
+            tag.putFloat("fixed_range", soundEvent.fixedRange());
+        }
+    }
+
+    protected Holder<SoundEvent> restoreSoundEventHolder(final CompoundTag tag) {
+        return restoreSoundEventHolder(tag, "sound_event");
+    }
+
+    protected Holder<SoundEvent> restoreSoundEventHolder(final CompoundTag tag, final String key) {
+        return restoreHolder(tag, key, soundEventTag -> {
+            final String identifier = soundEventTag.getString("identifier");
+            final FloatTag fixedRange = soundEventTag.getFloatTag("fixed_range");
+            return new SoundEvent(identifier, fixedRange != null ? fixedRange.asFloat() : null);
+        });
+    }
+
+    @Override
+    public String nbtTagName() {
+        return this.nbtTagName;
+    }
+}
@@ -0,0 +1,167 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.ListTag;
+import com.viaversion.nbt.tag.NumberTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viabackwards.utils.ChatUtil;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+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 {
+
+    public static final String ENCHANTMENT_LEVEL_TRANSLATION = "enchantment.level.%s";
+
+    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;
+                if (jsonFormat) {
+                    loreValue = ChatUtil.legacyToJsonString(remappedName, ENCHANTMENT_LEVEL_TRANSLATION.formatted(level), true);
+                } else {
+                    loreValue = remappedName + " " + getRomanNumber(level);
+                }
+
+                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 -> ENCHANTMENT_LEVEL_TRANSLATION.formatted(number); // Fallback to translation to match vanilla style
+        };
+    }
+}
@@ -0,0 +1,147 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.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) {
+        protocol.registerClientbound(packetType, wrapper -> {
+            wrapper.passthrough(Types.VAR_INT); // Entity ID
+            wrapper.passthrough(Types.UUID); // Entity UUID
+            wrapper.passthrough(Types.VAR_INT); // Entity Type
+            wrapper.passthrough(Types.DOUBLE); // X
+            wrapper.passthrough(Types.DOUBLE); // Y
+            wrapper.passthrough(Types.DOUBLE); // Z
+            wrapper.passthrough(Types.BYTE); // Pitch
+            wrapper.passthrough(Types.BYTE); // Yaw
+            wrapper.passthrough(Types.INT); // Data
+            getSpawnTrackerWithDataHandler().handle(wrapper);
+        });
+    }
+
+    @Override
+    public void registerTrackerWithData1_19(C packetType) {
+        protocol.registerClientbound(packetType, wrapper -> {
+            wrapper.passthrough(Types.VAR_INT); // Entity id
+            wrapper.passthrough(Types.UUID); // Entity UUID
+            wrapper.passthrough(Types.VAR_INT); // Entity type
+            wrapper.passthrough(Types.DOUBLE); // X
+            wrapper.passthrough(Types.DOUBLE); // Y
+            wrapper.passthrough(Types.DOUBLE); // Z
+            wrapper.passthrough(Types.BYTE); // Pitch
+            wrapper.passthrough(Types.BYTE); // Yaw
+            wrapper.passthrough(Types.BYTE); // Head yaw
+            wrapper.passthrough(Types.VAR_INT); // Data
+            getSpawnTrackerWithDataHandler1_19().handle(wrapper);
+        });
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler() {
+        return wrapper -> {
+            // Check against the UNMAPPED entity type
+            EntityType entityType = trackAndMapEntity(wrapper);
+            if (entityType == typeFromId("falling_block")) {
+                int blockState = wrapper.get(Types.INT, 0);
+                wrapper.set(Types.INT, 0, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler1_19() {
+        return wrapper -> {
+            if (protocol.getMappingData() == null) {
+                return;
+            }
+
+            // Check against the UNMAPPED entity type
+            EntityType entityType = trackAndMapEntity(wrapper);
+            if (entityType == typeFromId("falling_block")) {
+                int blockState = wrapper.get(Types.VAR_INT, 2);
+                wrapper.set(Types.VAR_INT, 2, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    @Override
+    public void registerTracker(C packetType) {
+        protocol.registerClientbound(packetType, wrapper -> {
+            wrapper.passthrough(Types.VAR_INT); // Entity ID
+            wrapper.passthrough(Types.UUID); // Entity UUID
+            wrapper.passthrough(Types.VAR_INT); // Entity Type
+            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.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);
+        if (entityType == null) {
+            return null;
+        }
+
+        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;
+    }
+}
@@ -0,0 +1,268 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.WrappedEntityData;
+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.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 displayNameDataType;
+    private final EntityDataType displayVisibilityDataType;
+    private final int displayNameIndex;
+    private final int displayVisibilityIndex;
+
+    EntityRewriterBase(T protocol, EntityDataType displayNameDataType, int displayNameIndex,
+                       EntityDataType displayVisibilityDataType, int displayVisibilityIndex) {
+        super(protocol, false);
+        this.displayNameDataType = displayNameDataType;
+        this.displayNameIndex = displayNameIndex;
+        this.displayVisibilityDataType = displayVisibilityDataType;
+        this.displayVisibilityIndex = displayVisibilityIndex;
+    }
+
+    @Override
+    public void handleEntityData(int entityId, List<EntityData> entityDataList, UserConnection connection) {
+        final TrackedEntity entity = tracker(connection).entity(entityId);
+        final boolean initialEntityData = !(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 (initialEntityData) {
+                if (displayName == null) {
+                    // Add it as new entity data
+                    entityDataList.add(new EntityData(displayNameIndex, displayNameDataType, displayNameObject));
+                    addDisplayVisibilityData(entityDataList);
+                } else if (displayName.getValue() == null || displayName.getValue().toString().isEmpty()) {
+                    // Overwrite the existing null/empty display name
+                    displayName.setValue(displayNameObject);
+                    addDisplayVisibilityData(entityDataList);
+                }
+            } else if (displayName != null && (displayName.getValue() == null || displayName.getValue().toString().isEmpty())) {
+                // Overwrite null/empty display name
+                displayName.setValue(displayNameObject);
+                addDisplayVisibilityData(entityDataList);
+            }
+        }
+
+        // Add any other extra data for mapped entities
+        if (entityMapping != null && entityMapping.hasBaseData() && initialEntityData) {
+            entityMapping.defaultData().createData(new WrappedEntityData(entityDataList));
+        }
+    }
+
+    private void addDisplayVisibilityData(List<EntityData> entityDataList) {
+        if (alwaysShowOriginalMobName()) {
+            removeData(displayVisibilityIndex, entityDataList);
+            entityDataList.add(new EntityData(displayVisibilityIndex, displayVisibilityDataType, getDisplayVisibilityDataValue()));
+        }
+    }
+
+    protected Object getDisplayVisibilityDataValue() {
+        return true;
+    }
+
+    protected boolean alwaysShowOriginalMobName() {
+        return ViaBackwards.getConfig().alwaysShowOriginalMobName();
+    }
+
+    protected @Nullable EntityData getData(int dataIndex, List<EntityData> entityDataList) {
+        for (EntityData entityData : entityDataList) {
+            if (entityData.id() == dataIndex) {
+                return entityData;
+            }
+        }
+        return null;
+    }
+
+    protected void removeData(int dataIndex, List<EntityData> entityDataList) {
+        entityDataList.removeIf(data -> data.id() == dataIndex);
+    }
+
+    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 registerEntityDataTypeHandler(
+        @Nullable EntityDataType itemType,
+        @Nullable EntityDataType blockStateType,
+        @Nullable EntityDataType optionalBlockStateType,
+        @Nullable EntityDataType particleType,
+        @Nullable EntityDataType componentType,
+        @Nullable EntityDataType optionalComponentType
+    ) {
+        filter().handler((event, data) -> {
+            EntityDataType type = data.dataType();
+            if (type == itemType) {
+                data.setValue(protocol.getItemRewriter().handleItemToClient(event.user(), data.value()));
+            } else if (type == blockStateType) {
+                int value = data.value();
+                data.setValue(protocol.getMappingData().getNewBlockStateId(value));
+            } else if (type == optionalBlockStateType) {
+                int value = data.value();
+                if (value != 0) {
+                    data.setValue(protocol.getMappingData().getNewBlockStateId(value));
+                }
+            } else if (type == particleType) {
+                protocol.getParticleRewriter().rewriteParticle(event.user(), data.value());
+            } else if (type == optionalComponentType || type == componentType) {
+                JsonElement text = data.value();
+                protocol.getComponentRewriter().processText(event.user(), text);
+            }
+        });
+    }
+
+    public void registerEntityDataTypeHandler1_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, data) -> {
+            EntityDataType type = data.dataType();
+            if (type == itemType) {
+                data.setValue(protocol.getItemRewriter().handleItemToClient(event.user(), data.value()));
+            } else if (type == blockStateType) {
+                int value = data.value();
+                data.setValue(protocol.getMappingData().getNewBlockStateId(value));
+            } else if (type == optionalBlockStateType) {
+                int value = data.value();
+                if (value != 0) {
+                    data.setValue(protocol.getMappingData().getNewBlockStateId(value));
+                }
+            } else if (type == particleType) {
+                protocol.getParticleRewriter().rewriteParticle(event.user(), data.value());
+            } else if (type == particlesType) {
+                Particle[] particles = data.value();
+                for (final Particle particle : particles) {
+                    protocol.getParticleRewriter().rewriteParticle(event.user(), particle);
+                }
+            } else if (type == optionalComponentType || type == componentType) {
+                protocol.getComponentRewriter().processTag(event.user(), data.value());
+            }
+        });
+    }
+
+    // ONLY TRACKS, DOESN'T REWRITE IDS
+    protected PacketHandler getTrackerHandler(Type<? extends Number> intType, int typeIndex) {
+        return wrapper -> {
+            Number id = wrapper.get(intType, typeIndex);
+            EntityType entityType = typeFromId(id.intValue());
+            if (entityType != null) {
+                tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), entityType);
+            }
+        };
+    }
+
+    protected PacketHandler getTrackerHandler() {
+        return getTrackerHandler(Types.VAR_INT, 1);
+    }
+
+    protected PacketHandler getTrackerHandler(EntityType entityType) {
+        return wrapper -> tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), entityType);
+    }
+
+    protected PacketHandler getPlayerTrackerHandler() {
+        return wrapper -> {
+            final int entityId = wrapper.get(Types.INT, 0);
+
+            final EntityTracker tracker = tracker(wrapper.user());
+            tracker(wrapper.user()).setClientEntityId(entityId);
+            tracker.addEntity(entityId, tracker.playerType());
+        };
+    }
+
+    protected PacketHandler getDimensionHandler(int index) {
+        return wrapper -> {
+            ClientWorld clientWorld = wrapper.user().getClientWorld(this.protocol.getClass());
+            int dimensionId = wrapper.get(Types.INT, index);
+            if (clientWorld.setEnvironment(dimensionId)) {
+                tracker(wrapper.user()).clearEntities();
+            }
+        };
+    }
+}
@@ -0,0 +1,392 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.NumberTag;
+import com.viaversion.nbt.tag.ShortTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingDataLoader;
+import com.viaversion.viabackwards.api.data.MappedLegacyBlockItem;
+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.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.IdAndData;
+import java.util.HashMap;
+import java.util.Map;
+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 = compress(unmappedId, unmappedData);
+            } else {
+                unmappedId = compress(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(compress(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(compress(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 Item item) {
+        if (item == null) return null;
+        item = 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 int objectData = wrapper.get(Types.INT, 0);
+            final EntityTypes1_12.ObjectType type = EntityTypes1_12.ObjectType.findById(wrapper.get(Types.BYTE, 0), objectData);
+            if (type == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
+                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().handleCompoundTag(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().handleCompoundTag(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(compress(id, data));
+        return mapping != null ? mapping : blockReplacements.get(compress(id, -1));
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedItem(int id, int data) {
+        MappedLegacyBlockItem mapping = itemReplacements.get(compress(id, data));
+        return mapping != null ? mapping : itemReplacements.get(compress(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);
+    }
+
+    protected int compress(final int id, final int data) {
+        // Using IdAndData for the internal storage can cause id overlaps in edge cases and would lead to wrong data
+        return (id << 16) | (data & 0xFFFF);
+    }
+
+    private record Pos(int x, short y, int z) {
+
+        public Pos(int x, int y, int z) {
+            this(x, (short) y, z);
+        }
+    }
+}
@@ -0,0 +1,191 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.viaversion.api.minecraft.item.Item;
+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);
+        }
+    }
+}
@@ -0,0 +1,176 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.EntityObjectData;
+import com.viaversion.viabackwards.api.entities.storage.EntityReplacement;
+import com.viaversion.viabackwards.api.entities.storage.WrappedEntityData;
+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 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().getClientWorld(protocol.getClass());
+                    if (clientWorld.setEnvironment(wrapper.get(Types.INT, 0))) {
+                        tracker(wrapper.user()).clearEntities();
+                    }
+                });
+            }
+        });
+    }
+
+    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 clientWorld = wrapper.user().getClientWorld(protocol.getClass());
+                    clientWorld.setEnvironment(wrapper.get(Types.INT, 1));
+
+                    final int entityId = wrapper.get(Types.INT, 0);
+                    tracker(wrapper.user()).addEntity(entityId, playerType);
+                    tracker(wrapper.user()).setClientEntityId(entityId);
+                });
+            }
+        });
+    }
+
+    protected PacketHandler getMobSpawnRewriter(Type<List<EntityData>> dataType, IdSetter idSetter) {
+        return wrapper -> {
+            int entityId = wrapper.get(Types.VAR_INT, 0);
+            EntityType type = tracker(wrapper.user()).entityType(entityId);
+            if (type == null) {
+                return;
+            }
+
+            List<EntityData> entityDataList = wrapper.get(dataType, 0);
+            handleEntityData(entityId, entityDataList, wrapper.user());
+
+            EntityReplacement entityReplacement = entityDataForType(type);
+            if (entityReplacement != null) {
+                idSetter.setId(wrapper, entityReplacement.replacementId());
+                if (entityReplacement.hasBaseData()) {
+                    entityReplacement.defaultData().createData(new WrappedEntityData(entityDataList));
+                }
+            }
+        };
+    }
+
+    public PacketHandler getMobSpawnRewriter(Type<List<EntityData>> dataType) {
+        return getMobSpawnRewriter(dataType, (wrapper, id) -> wrapper.set(Types.UNSIGNED_BYTE, 0, (short) id));
+    }
+
+    public PacketHandler getMobSpawnRewriter1_11(Type<List<EntityData>> dataType) {
+        return getMobSpawnRewriter(dataType, (wrapper, id) -> wrapper.set(Types.VAR_INT, 1, id));
+    }
+
+    protected PacketHandler getObjectTrackerHandler() {
+        return wrapper -> {
+            int id = wrapper.get(Types.BYTE, 0);
+            int data = wrapper.get(Types.INT, 0);
+            EntityType type = objectTypeFromId(id, data);
+            if (type == null) {
+                return;
+            }
+
+            tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), type);
+        };
+    }
+
+    protected PacketHandler getTrackerAndDataHandler(Type<List<EntityData>> dataType, EntityType entityType) {
+        return wrapper -> {
+            tracker(wrapper.user()).addEntity(wrapper.get(Types.VAR_INT, 0), entityType);
+            List<EntityData> entityDataList = wrapper.get(dataType, 0);
+            handleEntityData(wrapper.get(Types.VAR_INT, 0), entityDataList, wrapper.user());
+        };
+    }
+
+    protected PacketHandler getObjectRewriter(ObjectTypeGetter objectGetter) {
+        return wrapper -> {
+            int id = wrapper.get(Types.BYTE, 0);
+            int data = wrapper.get(Types.INT, 0);
+            ObjectType type = objectGetter.get(id, data);
+            if (type == null) {
+                return;
+            }
+
+            EntityReplacement replacement = getObjectData(type);
+            if (replacement != null) {
+                wrapper.set(Types.BYTE, 0, (byte) replacement.replacementId());
+                if (replacement.objectData() != -1) {
+                    wrapper.set(Types.INT, 0, replacement.objectData());
+                }
+            }
+        };
+    }
+
+    @FunctionalInterface
+    protected interface IdSetter {
+
+        void setId(PacketWrapper wrapper, int id);
+    }
+
+    @FunctionalInterface
+    protected interface ObjectTypeGetter {
+
+        ObjectType get(int id, int data);
+    }
+}
@@ -0,0 +1,79 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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) {
+    }
+}
@@ -0,0 +1,70 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.rewriter.IdRewriteFunction;
+
+public final class MapColorRewriter {
+
+    /**
+     * Rewrite map colors using the provided id rewriter.
+     *
+     * @param wrapper   packet wrapper
+     * @param rewriter  id rewriter returning mapped colors, or -1 if unmapped
+     * @param iconCount number of icons to read
+     */
+    public static void rewriteMapColors(PacketWrapper wrapper, IdRewriteFunction rewriter, int iconCount) {
+        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;
+            }
+        }
+    }
+
+    /**
+     * 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 -> rewriteMapColors(wrapper, rewriter, wrapper.passthrough(Types.VAR_INT));
+    }
+}
@@ -0,0 +1,85 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.data.Mappings;
+import com.viaversion.viaversion.api.protocol.AbstractProtocol;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Types;
+
+public class SoundRewriter<C extends ClientboundPacketType> extends com.viaversion.viaversion.rewriter.SoundRewriter<C> {
+
+    public SoundRewriter(final AbstractProtocol<C, ?, ?, ?> protocol) {
+        super(protocol);
+    }
+
+    public void registerNamedSound(final C packetType) {
+        if (protocol.getMappingData() == null || Mappings.isFullIdentity(protocol.getMappingData().getFullSoundMappings())) {
+            return;
+        }
+        protocol.registerClientbound(packetType, wrapper -> {
+            wrapper.passthrough(Types.STRING); // Sound identifier
+            getNamedSoundHandler().handle(wrapper);
+        });
+    }
+
+    public void registerStopSound(final C packetType) {
+        if (protocol.getMappingData() == null || Mappings.isFullIdentity(protocol.getMappingData().getFullSoundMappings())) {
+            return;
+        }
+        protocol.registerClientbound(packetType, wrapper -> {
+            final byte flags = wrapper.passthrough(Types.BYTE);
+            if ((flags & 0x01) != 0) {
+                wrapper.passthrough(Types.VAR_INT); // Source
+            }
+
+            if ((flags & 0x02) == 0) return; // No sound specified
+            final String soundId = wrapper.read(Types.STRING);
+            final String mappedId = protocol.getMappingData().getFullSoundMappings().mappedIdentifier(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();
+            }
+        });
+    }
+
+    public PacketHandler getNamedSoundHandler() {
+        return wrapper -> {
+            final String soundId = wrapper.get(Types.STRING, 0);
+            final String mappedId = protocol.getMappingData().getFullSoundMappings().mappedIdentifier(soundId);
+            if (mappedId == null) {
+                return;
+            }
+
+            if (!mappedId.isEmpty()) {
+                wrapper.set(Types.STRING, 0, mappedId);
+            } else {
+                wrapper.cancel();
+            }
+        };
+    }
+}
@@ -0,0 +1,216 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.viabackwards.utils.ChatUtil;
+import com.viaversion.viaversion.api.data.Mappings;
+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.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;
+
+import static com.viaversion.viabackwards.api.rewriters.EnchantmentRewriter.ENCHANTMENT_LEVEL_TRANSLATION;
+
+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(ChatUtil.legacyToJsonString("§7" + remappedName, ENCHANTMENT_LEVEL_TRANSLATION.formatted(level), true));
+        };
+        rewriteEnchantmentsToClient(data, StructuredDataKey.ENCHANTMENTS1_20_5, idRewriteFunction, descriptionSupplier, false);
+        rewriteEnchantmentsToClient(data, StructuredDataKey.STORED_ENCHANTMENTS1_20_5, idRewriteFunction, descriptionSupplier, true);
+    }
+
+    public void handleToServer(final Item item) {
+        final StructuredDataContainer data = item.dataContainer();
+        final CompoundTag customData = data.get(StructuredDataKey.CUSTOM_DATA);
+        if (customData != null) {
+            rewriteEnchantmentsToServer(data, customData, StructuredDataKey.ENCHANTMENTS1_20_5);
+            rewriteEnchantmentsToServer(data, customData, StructuredDataKey.STORED_ENCHANTMENTS1_20_5);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(final StructuredDataContainer data, final StructuredDataKey<Enchantments> key, final IdRewriteFunction rewriteFunction, final DescriptionSupplier descriptionSupplier, final boolean storedEnchant) {
+        final Enchantments enchantments = data.get(key);
+        if (enchantments == null || enchantments.size() == 0) {
+            return;
+        }
+
+        final List<Tag> loreToAdd = new ArrayList<>();
+        boolean removedEnchantments = false;
+        boolean updatedLore = false;
+
+        final ObjectIterator<Int2IntMap.Entry> iterator = enchantments.enchantments().int2IntEntrySet().iterator();
+        final List<PendingIdChange> updatedIds = new ArrayList<>();
+        while (iterator.hasNext()) {
+            final Int2IntMap.Entry entry = iterator.next();
+            final int id = entry.getIntKey();
+            final int mappedId = rewriteFunction.rewrite(id);
+            final int level = entry.getIntValue();
+            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(new PendingIdChange(id, mappedId, level));
+                }
+                continue;
+            }
+
+            if (!removedEnchantments) {
+                // Backup original before doing modifications
+                final CompoundTag customData = customData(data);
+                itemRewriter.saveListTag(customData, asTag(enchantments), key.identifier());
+                removedEnchantments = true;
+            }
+
+            final Tag description = descriptionSupplier.get(id, level);
+            if (description != null && enchantments.showInTooltip()) {
+                loreToAdd.add(description);
+                updatedLore = true;
+            }
+
+            iterator.remove();
+        }
+
+        // Remove all first, then add the new ones
+        for (final PendingIdChange change : updatedIds) {
+            enchantments.remove(change.id());
+        }
+        for (final PendingIdChange change : updatedIds) {
+            enchantments.add(change.mappedId(), change.level());
+        }
+
+        if (removedEnchantments) {
+            final CompoundTag tag = customData(data);
+            if (!storedEnchant && enchantments.size() == 0) {
+                // Add glint override if there are no enchantments left
+                final Boolean glintOverride = data.get(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE);
+                if (glintOverride != null) {
+                    tag.putBoolean(itemRewriter.nbtTagName("glint"), glintOverride);
+                } else {
+                    tag.putBoolean(itemRewriter.nbtTagName("noglint"), true);
+                }
+                data.set(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE, true);
+            }
+
+            if (enchantments.showInTooltip()) {
+                tag.putBoolean(itemRewriter.nbtTagName("show_" + key.identifier()), true);
+            }
+        }
+
+        if (updatedLore) {
+            // Save original lore
+            final CompoundTag tag = customData(data);
+            final Tag[] lore = data.get(StructuredDataKey.LORE);
+            if (lore != null) {
+                final List<Tag> loreList = Arrays.asList(lore);
+                itemRewriter.saveGenericTagList(tag, loreList, "lore");
+                loreToAdd.addAll(loreList);
+            } else {
+                tag.putBoolean(itemRewriter.nbtTagName("nolore"), true);
+            }
+            data.set(StructuredDataKey.LORE, loreToAdd.toArray(new Tag[0]));
+        }
+    }
+
+    private CompoundTag customData(final StructuredDataContainer data) {
+        CompoundTag tag = data.get(StructuredDataKey.CUSTOM_DATA);
+        if (tag == null) {
+            tag = new CompoundTag();
+            data.set(StructuredDataKey.CUSTOM_DATA, tag);
+        }
+        return tag;
+    }
+
+    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);
+    }
+
+    private record PendingIdChange(int id, int mappedId, int level) {
+    }
+}
@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.text;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.TranslatableMappings;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class JsonNBTComponentRewriter<C extends ClientboundPacketType> extends com.viaversion.viaversion.rewriter.text.JsonNBTComponentRewriter<C> implements TranslatableRewriter {
+
+    private final Map<String, String> translatables;
+
+    public JsonNBTComponentRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final ReadType type) {
+        super(protocol, type);
+        this.translatables = TranslatableMappings.translatablesFor(protocol);
+    }
+
+    public JsonNBTComponentRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final ReadType type, final String version) {
+        super(protocol, type);
+        this.translatables = TranslatableMappings.translatablesFor(version);
+    }
+
+    @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));
+        }
+    }
+
+    @Override
+    public @Nullable String mappedTranslationKey(final String translationKey) {
+        return translatables.get(translationKey);
+    }
+}
@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.text;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.TranslatableMappings;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class NBTComponentRewriter<C extends ClientboundPacketType> extends com.viaversion.viaversion.rewriter.text.NBTComponentRewriter<C> implements TranslatableRewriter {
+
+    private final Map<String, String> translatables;
+
+    public NBTComponentRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol) {
+        super(protocol);
+        this.translatables = TranslatableMappings.translatablesFor(protocol);
+    }
+
+    public NBTComponentRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final String version) {
+        super(protocol);
+        this.translatables = TranslatableMappings.translatablesFor(version);
+    }
+
+    @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));
+        }
+    }
+
+    @Override
+    public @Nullable String mappedTranslationKey(final String translationKey) {
+        return translatables.get(translationKey);
+    }
+}
@@ -0,0 +1,27 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.text;
+
+import com.viaversion.viaversion.api.rewriter.ComponentRewriter;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public interface TranslatableRewriter extends ComponentRewriter {
+
+    @Nullable
+    String mappedTranslationKey(String translationKey);
+}
@@ -0,0 +1,103 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.item;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonParser;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
+import com.viaversion.viaversion.libs.gson.JsonSyntaxException;
+import java.util.ArrayList;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Prevent expensive parsing/toString by checking against cached JsonElement instances, used from 1.14 to 1.20.5.
+ * <p>
+ * When using this, be careful not to break caching by modifying the display tag directly.
+ */
+public final class DataItemWithExtras extends DataItem {
+
+    private JsonElement name;
+    private List<JsonElement> lore;
+
+    public DataItemWithExtras(final Item from) {
+        setIdentifier(from.identifier());
+        setAmount(from.amount());
+        setData(from.data());
+        setTag(from.tag());
+
+        if (tag() == null) {
+            return;
+        }
+
+        final CompoundTag display = tag().getCompoundTag("display");
+        if (display == null) {
+            return;
+        }
+
+        final StringTag name = display.getStringTag("Name");
+        if (name != null) {
+            this.name = parse(name.getValue());
+        }
+
+        final ListTag<StringTag> lore = display.getListTag("Lore", StringTag.class);
+        if (lore != null) {
+            this.lore = new ArrayList<>(lore.size());
+            for (int i = 0; i < lore.size(); i++) {
+                this.lore.add(parse(lore.get(i).getValue()));
+            }
+        }
+    }
+
+    public @Nullable JsonElement name() {
+        return name;
+    }
+
+    public @Nullable StringTag rawName() {
+        if (tag() == null) {
+            return null;
+        }
+        final CompoundTag display = tag().getCompoundTag("display");
+        return display != null ? display.getStringTag("Name") : null;
+    }
+
+    public @Nullable List<JsonElement> lore() {
+        return lore;
+    }
+
+    public @Nullable ListTag<StringTag> rawLore() {
+        if (tag() == null) {
+            return null;
+        }
+        final CompoundTag display = tag().getCompoundTag("display");
+        return display != null ? display.getListTag("Lore", StringTag.class) : null;
+    }
+
+    private JsonElement parse(final String value) {
+        try {
+            return JsonParser.parseString(value);
+        } catch (final JsonSyntaxException e) {
+            return new JsonPrimitive(value);
+        }
+    }
+}
@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.registration;
+
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import com.viaversion.viaversion.protocol.shared_registration.SharedRegistrations;
+
+public final class BackwardsRegistrations {
+
+    private static final SharedRegistrations REGISTRATIONS = SharedRegistrations.create();
+
+    public static void apply() {
+        REGISTRATIONS.registrations()
+            .range(ProtocolVersion.v1_10, ProtocolVersion.v1_19_3, RegistryRegistrations::registerNamedSound1_10)
+            .since(ProtocolVersion.v1_14, RegistryRegistrations::registerStopSound1_14)
+
+            .register();
+    }
+
+    public static SharedRegistrations registrations() {
+        return REGISTRATIONS;
+    }
+}
@@ -0,0 +1,36 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2026 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.registration;
+
+import com.viaversion.viabackwards.api.rewriters.SoundRewriter;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.protocol.shared_registration.PacketBound;
+import com.viaversion.viaversion.protocol.shared_registration.RegistrationContext;
+import com.viaversion.viaversion.protocols.v1_13_2to1_14.packet.ClientboundPackets1_14;
+import com.viaversion.viaversion.protocols.v1_9_1to1_9_3.packet.ClientboundPackets1_9_3;
+
+final class RegistryRegistrations {
+
+    static <CU extends ClientboundPacketType> void registerNamedSound1_10(final RegistrationContext<CU, ?> ctx) {
+        ctx.clientbound(ClientboundPackets1_9_3.CUSTOM_SOUND, new SoundRewriter<>(ctx.protocol())::registerNamedSound, PacketBound.REMOVED_AT_MAX);
+    }
+
+    static <CU extends ClientboundPacketType> void registerStopSound1_14(final RegistrationContext<CU, ?> ctx) {
+        ctx.clientbound(ClientboundPackets1_14.STOP_SOUND, new SoundRewriter<>(ctx.protocol())::registerStopSound);
+    }
+}
@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.template;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viabackwards.api.rewriters.BackwardsStructuredItemRewriter;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.protocols.v1_21_11to26_1.packet.ClientboundPacket26_1;
+import com.viaversion.viaversion.protocols.v1_21_7to1_21_9.packet.ServerboundPacket1_21_9;
+
+// To replace if needed:
+//   ChunkType1_21_5
+//   RecipeDisplayRewriter
+final class BlockItemPacketRewriter99_1 extends BackwardsStructuredItemRewriter<ClientboundPacket26_1, ServerboundPacket1_21_9, Protocol99_1To98_1> {
+
+    public BlockItemPacketRewriter99_1(final Protocol99_1To98_1 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    public void registerPackets() {
+    }
+
+    @Override
+    protected void handleItemDataComponentsToClient(final UserConnection connection, final Item item, final StructuredDataContainer container) {
+        super.handleItemDataComponentsToClient(connection, item, container);
+        // downgradeData(item, container); // static import VV method
+    }
+
+    @Override
+    protected void handleItemDataComponentsToServer(final UserConnection connection, final Item item, final StructuredDataContainer container) {
+        super.handleItemDataComponentsToServer(connection, item, container);
+        // upgradeData(item, container); // static import VV method
+    }
+
+    @Override
+    protected void restoreBackupData(final Item item, final StructuredDataContainer container, final CompoundTag customData) {
+        super.restoreBackupData(item, container, customData);
+        // restore any data if needed here
+    }
+
+    @Override
+    protected void backupInconvertibleData(final UserConnection connection, final Item item, final StructuredDataContainer dataContainer, final CompoundTag backupTag) {
+        super.backupInconvertibleData(connection, item, dataContainer, backupTag);
+        // back up any data if needed here, called before the method below
+    }
+}
@@ -0,0 +1,42 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.template;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.rewriters.text.NBTComponentRewriter;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.protocols.v1_21_11to26_1.packet.ClientboundPacket26_1;
+
+final class ComponentRewriter99_1 extends NBTComponentRewriter<ClientboundPacket26_1> {
+
+    public ComponentRewriter99_1(final BackwardsProtocol<ClientboundPacket26_1, ?, ?, ?> protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void handleShowItem(final UserConnection connection, final CompoundTag itemTag, final CompoundTag componentsTag) {
+        super.handleShowItem(connection, itemTag, componentsTag);
+        if (componentsTag == null) {
+            return;
+        }
+
+        // Remove or update data from componentsTag
+        // Newly added data which is not handled otherwise needs to be removed to prevent errors on the client
+    }
+}
@@ -0,0 +1,75 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.template;
+
+import com.viaversion.viabackwards.api.rewriters.EntityRewriter;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_11;
+import com.viaversion.viaversion.api.minecraft.entitydata.types.EntityDataTypes26_1;
+import com.viaversion.viaversion.api.type.types.version.VersionedTypes;
+import com.viaversion.viaversion.protocols.v1_21_11to26_1.packet.ClientboundPacket26_1;
+
+// Replace if needed
+//  VersionedTypes
+final class EntityPacketRewriter99_1 extends EntityRewriter<ClientboundPacket26_1, Protocol99_1To98_1> {
+
+    private static final EntityDataTypes26_1 MAPPED_DATA_TYPES = VersionedTypes.V26_1.entityDataTypes;
+
+    public EntityPacketRewriter99_1(final Protocol99_1To98_1 protocol) {
+        super(protocol, MAPPED_DATA_TYPES.optionalComponentType, MAPPED_DATA_TYPES.booleanType);
+    }
+
+    @Override
+    public void registerPackets() {
+    }
+
+    @Override
+    protected void registerRewrites() {
+        dataTypeMapper().register();
+        /* ... or like this for additions and removals that are not at the very end
+        dataTypeMapper()
+            .added(MAPPED_DATA_TYPES.catSoundVariant)
+            .removed(MAPPED_DATA_TYPES.cowSoundVariant)
+            .skip(MAPPED_DATA_TYPES.pigSoundVariant) // if neither removed nor added, but the value type has to be changed separately
+            .register();*/
+
+        registerEntityDataTypeHandler1_20_3(
+            MAPPED_DATA_TYPES.itemType,
+            MAPPED_DATA_TYPES.blockStateType,
+            MAPPED_DATA_TYPES.optionalBlockStateType,
+            MAPPED_DATA_TYPES.particleType,
+            MAPPED_DATA_TYPES.particlesType,
+            MAPPED_DATA_TYPES.componentType,
+            MAPPED_DATA_TYPES.optionalComponentType
+        );
+
+        // Remove entity data of new entity type
+        // filter().type(EntityTypes1_21_11.SNIFFER).removeIndex(newIndex);
+    }
+
+    @Override
+    public void onMappingDataLoaded() {
+        super.onMappingDataLoaded();
+        // mapEntityTypeWithData(EntityTypes1_21_11.SNIFFER, EntityTypes1_21_11.RAVAGER).tagName();
+    }
+
+    @Override
+    public EntityType typeFromId(final int type) {
+        return EntityTypes1_21_11.getTypeFromId(type);
+    }
+}
@@ -0,0 +1,150 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.template;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappingData;
+import com.viaversion.viabackwards.api.rewriters.BackwardsRegistryRewriter;
+import com.viaversion.viabackwards.api.rewriters.text.NBTComponentRewriter;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_21_11;
+import com.viaversion.viaversion.api.protocol.packet.provider.PacketTypesProvider;
+import com.viaversion.viaversion.api.protocol.packet.provider.SimplePacketTypesProvider;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType26_1;
+import com.viaversion.viaversion.api.type.types.version.VersionedTypes;
+import com.viaversion.viaversion.api.type.types.version.VersionedTypesHolder;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.data.item.ItemHasherBase;
+import com.viaversion.viaversion.protocols.v1_21_11to26_1.Protocol1_21_11To26_1;
+import com.viaversion.viaversion.protocols.v1_21_11to26_1.packet.ClientboundPacket26_1;
+import com.viaversion.viaversion.protocols.v1_21_11to26_1.packet.ClientboundPackets26_1;
+import com.viaversion.viaversion.protocols.v1_21_4to1_21_5.rewriter.RecipeDisplayRewriter1_21_5;
+import com.viaversion.viaversion.protocols.v1_21_5to1_21_6.packet.ServerboundPackets1_21_6;
+import com.viaversion.viaversion.protocols.v1_21_7to1_21_9.packet.ClientboundConfigurationPackets1_21_9;
+import com.viaversion.viaversion.protocols.v1_21_7to1_21_9.packet.ServerboundConfigurationPackets1_21_9;
+import com.viaversion.viaversion.protocols.v1_21_7to1_21_9.packet.ServerboundPacket1_21_9;
+import com.viaversion.viaversion.rewriter.BlockRewriter;
+import com.viaversion.viaversion.rewriter.ParticleRewriter;
+import com.viaversion.viaversion.rewriter.RecipeDisplayRewriter;
+import com.viaversion.viaversion.rewriter.TagRewriter;
+import com.viaversion.viaversion.rewriter.block.BlockRewriter1_21_5;
+
+import static com.viaversion.viaversion.util.ProtocolUtil.packetTypeMap;
+
+// Placeholders to replace (in the entire package):
+//   Protocol1_21_11To26_1 (the ViaVersion protocol class the mappings depend on)
+//   ClientboundPacket26_1
+//   ServerboundPacket1_21_9
+//   ClientboundConfigurationPackets1_21
+//   ServerboundConfigurationPackets1_20_5
+//   EntityTypes1_21_11 (UNMAPPED type)
+//   VersionedTypes.V26_1
+//   99.1, 98.1
+final class Protocol99_1To98_1 extends BackwardsProtocol<ClientboundPacket26_1, ClientboundPacket26_1, ServerboundPacket1_21_9, ServerboundPacket1_21_9> {
+
+    // ViaBackwards uses its own mappings and also needs a translatablerewriter for translation mappings
+    public static final BackwardsMappingData MAPPINGS = new BackwardsMappingData("99.1", "98.1", Protocol1_21_11To26_1.class); // Change the VV (!) protocol class
+    private final EntityPacketRewriter99_1 entityRewriter = new EntityPacketRewriter99_1(this);
+    private final BlockItemPacketRewriter99_1 itemRewriter = new BlockItemPacketRewriter99_1(this);
+    private final ParticleRewriter<ClientboundPacket26_1> particleRewriter = new ParticleRewriter<>(this);
+    private final NBTComponentRewriter<ClientboundPacket26_1> translatableRewriter = new ComponentRewriter99_1(this);
+    private final TagRewriter<ClientboundPacket26_1> tagRewriter = new TagRewriter<>(this);
+    private final BackwardsRegistryRewriter registryDataRewriter = new BackwardsRegistryRewriter(this);
+    private final BlockRewriter<ClientboundPacket26_1> blockRewriter = new BlockRewriter1_21_5<>(this, ChunkType26_1::new);
+    private final RecipeDisplayRewriter<ClientboundPacket26_1> recipeRewriter = new RecipeDisplayRewriter1_21_5<>(this);
+
+    public Protocol99_1To98_1() {
+        super(ClientboundPacket26_1.class, ClientboundPacket26_1.class, ServerboundPacket1_21_9.class, ServerboundPacket1_21_9.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        super.registerPackets();
+    }
+
+    @Override
+    public void init(final UserConnection connection) {
+        addEntityTracker(connection, new EntityTrackerBase(connection, EntityTypes1_21_11.PLAYER));
+        connection.addItemHasher(this.getClass(), new ItemHasherBase(this, connection));
+    }
+
+    @Override
+    public BackwardsMappingData getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPacketRewriter99_1 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPacketRewriter99_1 getItemRewriter() {
+        return itemRewriter;
+    }
+
+    @Override
+    public BlockRewriter<ClientboundPacket26_1> getBlockRewriter() {
+        return blockRewriter;
+    }
+
+    @Override
+    public RecipeDisplayRewriter<ClientboundPacket26_1> getRecipeRewriter() {
+        return recipeRewriter;
+    }
+
+    @Override
+    public BackwardsRegistryRewriter getRegistryDataRewriter() {
+        return registryDataRewriter;
+    }
+
+    @Override
+    public ParticleRewriter<ClientboundPacket26_1> getParticleRewriter() {
+        return particleRewriter;
+    }
+
+    @Override
+    public NBTComponentRewriter<ClientboundPacket26_1> getComponentRewriter() {
+        return translatableRewriter;
+    }
+
+    @Override
+    public TagRewriter<ClientboundPacket26_1> getTagRewriter() {
+        return tagRewriter;
+    }
+
+    @Override
+    public VersionedTypesHolder types() {
+        return VersionedTypes.V26_1;
+    }
+
+    @Override
+    public VersionedTypesHolder mappedTypes() {
+        return VersionedTypes.V26_1;
+    }
+
+    @Override
+    protected PacketTypesProvider<ClientboundPacket26_1, ClientboundPacket26_1, ServerboundPacket1_21_9, ServerboundPacket1_21_9> createPacketTypesProvider() {
+        return new SimplePacketTypesProvider<>(
+            packetTypeMap(unmappedClientboundPacketType, ClientboundPackets26_1.class, ClientboundConfigurationPackets1_21_9.class),
+            packetTypeMap(mappedClientboundPacketType, ClientboundPackets26_1.class, ClientboundConfigurationPackets1_21_9.class),
+            packetTypeMap(mappedServerboundPacketType, ServerboundPackets1_21_6.class, ServerboundConfigurationPackets1_21_9.class),
+            packetTypeMap(unmappedServerboundPacketType, ServerboundPackets1_21_6.class, ServerboundConfigurationPackets1_21_9.class)
+        );
+    }
+}
@@ -0,0 +1,119 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.text.JsonNBTComponentRewriter;
+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.text.ComponentRewriterBase;
+
+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);
+        replaceClientbound(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());
+            }
+        });
+        replaceClientbound(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
+            }
+        });
+
+        JsonNBTComponentRewriter<ClientboundPackets1_9_3> componentRewriter = new JsonNBTComponentRewriter<>(this, ComponentRewriterBase.ReadType.JSON);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_9_3.CHAT);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_10.EntityType.PLAYER));
+        user.addClientWorld(this.getClass(), new ClientWorld());
+    }
+
+    @Override
+    public BackwardsMappingData getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPacketRewriter1_10 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPacketRewriter1_10 getItemRewriter() {
+        return itemRewriter;
+    }
+}
@@ -0,0 +1,91 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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().getClientWorld(Protocol1_10To1_9_3.class);
+
+            ChunkType1_9_3 type = ChunkType1_9_3.forEnvironment(clientWorld.getEnvironment());
+            Chunk chunk = wrapper.passthrough(type);
+
+            handleChunk(chunk);
+        });
+
+        // Rewrite entity data items
+        protocol.getEntityRewriter().filter().handler((event, data) -> {
+            if (data.dataType().type().equals(Types.ITEM1_8)) // Is Item
+                data.setValue(handleItemToClient(event.user(), (Item) data.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
+                    }
+                });
+            }
+        });
+    }
+}
@@ -0,0 +1,176 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.WrappedEntityData;
+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.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(Types.ENTITY_DATA_LIST1_9); // 12 - Entity data
+
+                // Track entity
+                handler(getTrackerHandler(Types.UNSIGNED_BYTE, 0));
+
+                // Rewrite entity type / data
+                handler(wrapper -> {
+                    int entityId = wrapper.get(Types.VAR_INT, 0);
+                    EntityType type = tracker(wrapper.user()).entityType(entityId);
+                    if (type == null) {
+                        return;
+                    }
+
+                    List<EntityData> entityDataList = wrapper.get(Types.ENTITY_DATA_LIST1_9, 0);
+                    handleEntityData(wrapper.get(Types.VAR_INT, 0), entityDataList, wrapper.user());
+
+                    EntityReplacement entityReplacement = entityDataForType(type);
+                    if (entityReplacement != null) {
+                        WrappedEntityData storage = new WrappedEntityData(entityDataList);
+                        wrapper.set(Types.UNSIGNED_BYTE, 0, (short) entityReplacement.replacementId());
+                        if (entityReplacement.hasBaseData())
+                            entityReplacement.defaultData().createData(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(Types.ENTITY_DATA_LIST1_9); // 7 - Entity data list
+
+                handler(getTrackerAndDataHandler(Types.ENTITY_DATA_LIST1_9, EntityTypes1_11.EntityType.PLAYER));
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_9_3.SET_ENTITY_DATA, Types.ENTITY_DATA_LIST1_9);
+    }
+
+    @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, data) -> {
+            boolean b = (boolean) data.getValue();
+
+            data.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, data) -> {
+            if ((int) data.getValue() == 6) { // Is type Husk
+                data.setValue(0);
+            }
+        });
+
+        // Handle Stray (index 12 -> Skeleton Type)
+        filter().type(EntityTypes1_10.EntityType.SKELETON).index(12).handler((event, data) -> {
+            if ((int) data.getValue() == 2) {
+                data.setValue(0); // Change to default skeleton
+            }
+        });
+
+        // Added index from incorrect entity data hierarchy, where potions add to item entities
+        filter().type(EntityTypes1_10.EntityType.POTION).addIndex(6);
+
+        // Handle the missing NoGravity tag for every entity data
+        filter().removeIndex(5);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_10.EntityType.findById(typeId);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId, int data) {
+        return EntityTypes1_10.ObjectType.getEntityType(typeId, data);
+    }
+}
@@ -0,0 +1,55 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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) {
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_11.EntityType.PLAYER));
+        user.addClientWorld(this.getClass(), new ClientWorld());
+    }
+
+    @Override
+    public EntityPacketRewriter1_11_1 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public ItemPacketRewriter1_11_1 getItemRewriter() {
+        return itemRewriter;
+    }
+}
@@ -0,0 +1,126 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.Types;
+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(Types.ENTITY_DATA_LIST1_9); // 12 - Entity data
+
+                // Track entity
+                handler(getTrackerHandler());
+
+                // Rewrite entity type / data
+                handler(getMobSpawnRewriter1_11(Types.ENTITY_DATA_LIST1_9));
+            }
+        });
+
+        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(Types.ENTITY_DATA_LIST1_9); // 7 - Entity data list
+
+                handler(getTrackerAndDataHandler(Types.ENTITY_DATA_LIST1_9, EntityTypes1_11.EntityType.PLAYER));
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_9_3.SET_ENTITY_DATA, Types.ENTITY_DATA_LIST1_9);
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Handle non-existing firework entity data (index 7 entity id for boosting)
+        filter().type(EntityTypes1_11.EntityType.FIREWORK_ROCKET).cancel(7);
+
+        // Handle non-existing pig entity data (index 14 - boost time)
+        filter().type(EntityTypes1_11.EntityType.PIG).cancel(14);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_11.EntityType.findById(typeId);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId, int data) {
+        return EntityTypes1_11.ObjectType.getEntityType(typeId, data);
+    }
+}
@@ -0,0 +1,79 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.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 entity data
+        protocol.getEntityRewriter().filter().handler((event, data) -> {
+            if (data.dataType().type().equals(Types.ITEM1_8)) { // Is Item
+                data.setValue(handleItemToClient(event.user(), (Item) data.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;
+        item = super.handleItemToServer(connection, item);
+
+        enchantmentRewriter.handleToServer(item);
+        return item;
+    }
+}
@@ -0,0 +1,86 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.text.JsonNBTComponentRewriter;
+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_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.text.ComponentRewriterBase;
+
+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 JsonNBTComponentRewriter<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);
+
+        componentRewriter = new JsonNBTComponentRewriter<>(this, ComponentRewriterBase.ReadType.JSON);
+        componentRewriter.registerComponentPacket(ClientboundPackets1_9_3.CHAT);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_11.EntityType.PLAYER));
+        user.addClientWorld(this.getClass(), new ClientWorld());
+
+        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;
+    }
+
+    @Override
+    public JsonNBTComponentRewriter<ClientboundPackets1_9_3> getComponentRewriter() {
+        return componentRewriter;
+    }
+}
@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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);
+    }
+}
@@ -0,0 +1,355 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.StringTag;
+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.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.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.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().getClientWorld(Protocol1_11To1_10.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, data) -> {
+            if (data.dataType().type().equals(Types.ITEM1_8)) // Is Item
+                data.setValue(handleItemToClient(event.user(), (Item) data.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));
+
+        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;
+        item = 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;
+    }
+}
@@ -0,0 +1,373 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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.WrappedEntityData;
+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.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(Types.ENTITY_DATA_LIST1_9); // 12 - Entity data
+
+                // Track entity
+                handler(getTrackerHandler(Types.UNSIGNED_BYTE, 0));
+
+                // Rewrite entity type / data
+                handler(getMobSpawnRewriter(Types.ENTITY_DATA_LIST1_9));
+
+                // Sub 1.11 clients will error if the list is empty
+                handler(wrapper -> {
+                    List<EntityData> entityDataList = wrapper.get(Types.ENTITY_DATA_LIST1_9, 0);
+                    if (entityDataList.isEmpty()) {
+                        entityDataList.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(Types.ENTITY_DATA_LIST1_9); // 7 - Entity data list
+
+                handler(getTrackerAndDataHandler(Types.ENTITY_DATA_LIST1_9, EntityTypes1_11.EntityType.PLAYER));
+                handler(wrapper -> {
+                    // Sub 1.11 clients will cry if the list is empty
+                    List<EntityData> entityDataList = wrapper.get(Types.ENTITY_DATA_LIST1_9, 0);
+                    if (entityDataList.isEmpty()) {
+                        entityDataList.add(new EntityData(0, EntityDataTypes1_9.BYTE, (byte) 0));
+                    }
+                });
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.REMOVE_ENTITIES);
+        registerSetEntityData(ClientboundPackets1_9_3.SET_ENTITY_DATA, Types.ENTITY_DATA_LIST1_9);
+
+        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 -> {
+                    final int entityId = wrapper.get(Types.INT, 0);
+                    if (entityId != tracker(wrapper.user()).clientEntityId()) {
+                        // Entity events are sent for all players, but we only want to apply this for the self player
+                        return;
+                    }
+
+                    final byte entityStatus = wrapper.get(Types.BYTE, 0);
+                    if (entityStatus == 35) {
+                        // TODO spawn particles?
+                        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).spawnEntityData(storage -> storage.add(getSkeletonTypeData(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.STRAY, EntityTypes1_11.EntityType.SKELETON).plainName().spawnEntityData(storage -> storage.add(getSkeletonTypeData(2)));
+        // Zombies
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.HUSK, EntityTypes1_11.EntityType.ZOMBIE).plainName().spawnEntityData(storage -> handleZombieType(storage, 6));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ZOMBIE_VILLAGER, EntityTypes1_11.EntityType.ZOMBIE).spawnEntityData(storage -> handleZombieType(storage, 1));
+        // Horses
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.HORSE, EntityTypes1_11.EntityType.HORSE).spawnEntityData(storage -> storage.add(getHorseDataType(0))); // Nob able to ride the horse without having the EntityDataType sent.
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.DONKEY, EntityTypes1_11.EntityType.HORSE).spawnEntityData(storage -> storage.add(getHorseDataType(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.MULE, EntityTypes1_11.EntityType.HORSE).spawnEntityData(storage -> storage.add(getHorseDataType(2)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.SKELETON_HORSE, EntityTypes1_11.EntityType.HORSE).spawnEntityData(storage -> storage.add(getHorseDataType(4)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ZOMBIE_HORSE, EntityTypes1_11.EntityType.HORSE).spawnEntityData(storage -> storage.add(getHorseDataType(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().spawnEntityData(storage -> storage.add(new EntityData(13, EntityDataTypes1_9.VAR_INT, 4))); // Base Profession
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.LLAMA, EntityTypes1_11.EntityType.HORSE).plainName().spawnEntityData(storage -> storage.add(getHorseDataType(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 entity data
+        filter().type(EntityTypes1_11.EntityType.GUARDIAN).index(12).handler((event, data) -> {
+            boolean b = (boolean) data.getValue();
+            int bitmask = b ? 0x02 : 0;
+
+            if (event.entityType() == EntityTypes1_11.EntityType.ELDER_GUARDIAN) {
+                bitmask |= 0x04;
+            }
+
+            data.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, data) -> {
+            switch (data.id()) {
+                case 13 -> event.cancel();
+                case 14 -> event.setIndex(15);
+                case 15 -> event.setIndex(14);
+                case 16 -> {
+                    // Profession
+                    event.setIndex(13);
+                    data.setValue(1 + (int) data.getValue());
+                }
+            }
+        });
+
+        // Handle Evocation Illager
+        filter().type(EntityTypes1_11.EntityType.EVOKER).index(12).handler((event, data) -> {
+            event.setIndex(13);
+            data.setTypeAndValue(EntityDataTypes1_9.VAR_INT, ((Byte) data.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, data) -> {
+            data.setValue((byte) 0x00);
+        });
+
+        // Handle VindicationIllager
+        filter().type(EntityTypes1_11.EntityType.VINDICATOR).index(12).handler((event, data) -> {
+            event.setIndex(13);
+            data.setTypeAndValue(EntityDataTypes1_9.VAR_INT, ((Number) data.getValue()).intValue() == 1 ? 2 : 4);
+        });
+
+        /*
+            HORSES
+         */
+
+        // Handle horse flags
+        filter().type(EntityTypes1_11.EntityType.ABSTRACT_HORSE).index(13).handler((event, data) -> {
+            StoredEntityData entityData = storedEntityData(event);
+            byte b = (byte) data.getValue();
+            if (entityData.has(ChestedHorseStorage.class) && entityData.get(ChestedHorseStorage.class).isChested()) {
+                b |= 0x08; // Chested
+                data.setValue(b);
+            }
+        });
+
+        // Create chested horse storage
+        filter().type(EntityTypes1_11.EntityType.CHESTED_HORSE).handler((event, data) -> {
+            StoredEntityData entityData = storedEntityData(event);
+            if (!entityData.has(ChestedHorseStorage.class)) {
+                entityData.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, data) -> {
+            StoredEntityData entityData = storedEntityData(event);
+            ChestedHorseStorage storage = entityData.get(ChestedHorseStorage.class);
+            boolean b = (boolean) data.getValue();
+            storage.setChested(b);
+            event.cancel();
+        });
+
+        // Get rid of Liama entity data
+        filter().type(EntityTypes1_11.EntityType.LLAMA).handler((event, data) -> {
+            StoredEntityData entityData = storedEntityData(event);
+            ChestedHorseStorage storage = entityData.get(ChestedHorseStorage.class);
+
+            int index = event.index();
+            // Store them for later (:
+            switch (index) {
+                case 16 -> {
+                    storage.setLiamaStrength((int) data.getValue());
+                    event.cancel();
+                }
+                case 17 -> {
+                    storage.setLiamaCarpetColor((int) data.getValue());
+                    event.cancel();
+                }
+                case 18 -> {
+                    storage.setLiamaVariant((int) data.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, data) -> {
+            if ((int) data.getValue() == 5) {
+                data.setValue(0);
+            }
+        });
+
+        // handle new Shulker color data
+        filter().type(EntityTypes1_11.EntityType.SHULKER).cancel(15);
+    }
+
+    /*
+        0 - Skeleton
+        1 - Wither Skeleton
+        2 - Stray
+     */
+
+    private EntityData getSkeletonTypeData(int type) {
+        return new EntityData(12, EntityDataTypes1_9.VAR_INT, type);
+    }
+
+    /*
+        0 - Zombie
+        1-5 - Villager with profession
+        6 - Husk
+     */
+    private EntityData getZombieTypeData(int type) {
+        return new EntityData(13, EntityDataTypes1_9.VAR_INT, type);
+    }
+
+    private void handleZombieType(WrappedEntityData storage, int type) {
+        EntityData meta = storage.get(13);
+        if (meta == null) {
+            storage.add(getZombieTypeData(type));
+        }
+    }
+
+    /*
+        Horse 0
+        Donkey 1
+        Mule 2
+        Zombie horse 3
+        Skeleton horse 4
+    */
+    private EntityData getHorseDataType(int type) {
+        return new EntityData(14, EntityDataTypes1_9.VAR_INT, type);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_11.EntityType.findById(typeId);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId, int data) {
+        return EntityTypes1_11.ObjectType.getEntityType(typeId, data);
+    }
+}
@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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);
+            }
+        });
+    }
+}
@@ -0,0 +1,63 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 + '}';
+    }
+}
@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2026 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 + '}';
+    }
+}
+
				`@@ -0,0 +1 @@`
				`.gitea/CODEOWNERS linguist-detectable=false`