Handle empty items in pre 1.20.5 protocols

Maps empty items to null on read in 1.13, 1.13.2 and 1.20.2 item types and handles the empty item->null transition in 1.10->1.11

.editorconfig

@@ -8,6 +8,9 @@ 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_imports_layout = *, |, $*
 ij_java_generate_final_locals = true
-ij_java_generate_final_parameters = true
+ij_java_generate_final_parameters = true
+
+[{*.json,*.yml}]
+indent_size = 2

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -71,9 +71,9 @@ body:
     attributes:
       label: Additional Server Info
       description: |
-        Do you use a proxy (e.g. BungeeCord)? What software do you use and what plugins?
+        Do you use a proxy (e.g. Velocity)? What software do you use and what plugins?
       placeholder: |
-        Example: "I also use BungeeCord with the following plugins: x, y, z"
+        Example: "I also use Velocity with the following plugins: x, y, z"
     validations:
       required: false
 
@@ -82,7 +82,7 @@ body:
       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. BungeeCord), **not on both**.
+        - 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

.github/workflows/gradle.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Checkout Repository
       uses: actions/checkout@v4
     - name: Validate Gradle Wrapper
-      uses: gradle/wrapper-validation-action@v1
+      uses: gradle/actions/wrapper-validation@v3
     - name: Set up JDK 17
       uses: actions/setup-java@v4
       with:

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Checkout Repository
         uses: actions/checkout@v4
       - name: Validate Gradle Wrapper
-        uses: gradle/wrapper-validation-action@v1
+        uses: gradle/actions/wrapper-validation@v3
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:

README.md

@@ -7,9 +7,9 @@
 **Allows the connection of higher client versions to lower server versions -
 it works on any platform you can think of.**
 
-The base ViaVersion jar runs on Paper, Velocity, Bungee, and Sponge. We also have projects integrating ViaVersion to run
-on Fabric, Forge, or as a standalone proxy to  join from basically any client version on any server version from the
-past decade. **See [HERE](https://github.com/ViaVersion) for an overview of the different Via\* projects.**
+The base ViaVersion jar runs on Paper and Velocity. We also have projects integrating ViaVersion to run
+on Fabric, Forge, Bungee, Sponge, or as a standalone proxy to join from basically any client version on
+any server version from the past decade. **See [HERE](https://github.com/ViaVersion) for an overview of the different Via\* projects.**
 
 Supported Versions:
 
@@ -47,7 +47,7 @@ ViaVersion as a Dependency
 <dependency>
     <groupId>com.viaversion</groupId>
     <artifactId>viaversion-api</artifactId>
-    <version>[4.0.0,5.0.0)</version>
+    <version>[5.0.0,6.0.0)</version>
     <scope>provided</scope>
 </dependency>
 ```
@@ -73,6 +73,8 @@ 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 ViaVersion.
+
 
 Mapping Files
 --------------

api-legacy/build.gradle.kts

@@ -1,3 +0,0 @@
-dependencies {
-    compileOnly(projects.viaversionApi)
-}

api-legacy/src/main/java/us/myles/ViaVersion/api/Via.java

@@ -1,101 +0,0 @@
-/*
- * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2024 ViaVersion and contributors
- *
- * 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 us.myles.ViaVersion.api;
-
-import io.netty.buffer.ByteBuf;
-import java.util.SortedSet;
-import java.util.UUID;
-import us.myles.ViaVersion.api.boss.BossBar;
-import us.myles.ViaVersion.api.boss.BossColor;
-import us.myles.ViaVersion.api.boss.BossStyle;
-
-/**
- * @deprecated may be removed at some point, use {@link com.viaversion.viaversion.api.Via}
- */
-@Deprecated
-public class Via<T> implements ViaAPI<T> {
-
-    private static final ViaAPI INSTANCE = new Via();
-
-    private Via() {
-    }
-
-    @Deprecated
-    public static ViaAPI getAPI() {
-        return INSTANCE;
-    }
-
-    @Override
-    public int getPlayerVersion(T player) {
-        return com.viaversion.viaversion.api.Via.getAPI().getPlayerVersion(player);
-    }
-
-    @Override
-    public int getPlayerVersion(UUID uuid) {
-        return com.viaversion.viaversion.api.Via.getAPI().getPlayerVersion(uuid);
-    }
-
-    @Override
-    public boolean isInjected(UUID playerUUID) {
-        return com.viaversion.viaversion.api.Via.getAPI().isInjected(playerUUID);
-    }
-
-    @Override
-    public String getVersion() {
-        return com.viaversion.viaversion.api.Via.getAPI().getVersion();
-    }
-
-    @Override
-    public void sendRawPacket(T player, ByteBuf packet) {
-        com.viaversion.viaversion.api.Via.getAPI().sendRawPacket(player, packet);
-    }
-
-    @Override
-    public void sendRawPacket(UUID uuid, ByteBuf packet) {
-        com.viaversion.viaversion.api.Via.getAPI().sendRawPacket(uuid, packet);
-    }
-
-    @Override
-    public BossBar createBossBar(String title, BossColor color, BossStyle style) {
-        return new BossBar(com.viaversion.viaversion.api.Via.getAPI().legacyAPI().createLegacyBossBar(title,
-                com.viaversion.viaversion.api.legacy.bossbar.BossColor.values()[color.ordinal()],
-                com.viaversion.viaversion.api.legacy.bossbar.BossStyle.values()[style.ordinal()]));
-    }
-
-    @Override
-    public BossBar createBossBar(String title, float health, BossColor color, BossStyle style) {
-        return new BossBar(com.viaversion.viaversion.api.Via.getAPI().legacyAPI().createLegacyBossBar(title, health,
-                com.viaversion.viaversion.api.legacy.bossbar.BossColor.values()[color.ordinal()],
-                com.viaversion.viaversion.api.legacy.bossbar.BossStyle.values()[style.ordinal()]));
-    }
-
-    @Override
-    public SortedSet<Integer> getSupportedVersions() {
-        return com.viaversion.viaversion.api.Via.getAPI().getSupportedVersions();
-    }
-
-    @Override
-    public SortedSet<Integer> getFullSupportedVersions() {
-        return com.viaversion.viaversion.api.Via.getAPI().getFullSupportedVersions();
-    }
-}

api-legacy/src/main/java/us/myles/ViaVersion/api/boss/BossBar.java

@@ -1,133 +0,0 @@
-/*
- * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2024 ViaVersion and contributors
- *
- * 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 us.myles.ViaVersion.api.boss;
-
-import java.util.Set;
-import java.util.UUID;
-
-@Deprecated
-public class BossBar<T> {
-
-    private final com.viaversion.viaversion.api.legacy.bossbar.BossBar bossBar;
-
-    public BossBar(com.viaversion.viaversion.api.legacy.bossbar.BossBar bossBar) {
-        this.bossBar = bossBar;
-    }
-
-    public String getTitle() {
-        return bossBar.getTitle();
-    }
-
-    public BossBar setTitle(String title) {
-        bossBar.setTitle(title);
-        return this;
-    }
-
-    public float getHealth() {
-        return bossBar.getHealth();
-    }
-
-    public BossBar setHealth(float health) {
-        bossBar.setHealth(health);
-        return this;
-    }
-
-    public BossColor getColor() {
-        return BossColor.values()[bossBar.getColor().ordinal()];
-    }
-
-    public BossBar setColor(BossColor color) {
-        bossBar.setColor(com.viaversion.viaversion.api.legacy.bossbar.BossColor.values()[color.ordinal()]);
-        return this;
-    }
-
-    public BossStyle getStyle() {
-        return BossStyle.values()[bossBar.getStyle().ordinal()];
-    }
-
-    public BossBar setStyle(BossStyle style) {
-        bossBar.setStyle(com.viaversion.viaversion.api.legacy.bossbar.BossStyle.values()[style.ordinal()]);
-        return this;
-    }
-
-    @Deprecated
-    public BossBar addPlayer(T player) {
-        return this;
-    }
-
-    public BossBar addPlayer(UUID player) {
-        bossBar.addPlayer(player);
-        return this;
-    }
-
-    @Deprecated
-    public BossBar addPlayers(T... players) {
-        return this;
-    }
-
-    @Deprecated
-    public BossBar removePlayer(T player) {
-        return this;
-    }
-
-    public BossBar removePlayer(UUID uuid) {
-        bossBar.removePlayer(uuid);
-        return this;
-    }
-
-    public BossBar addFlag(BossFlag flag) {
-        bossBar.addFlag(com.viaversion.viaversion.api.legacy.bossbar.BossFlag.values()[flag.ordinal()]);
-        return this;
-    }
-
-    public BossBar removeFlag(BossFlag flag) {
-        bossBar.removeFlag(com.viaversion.viaversion.api.legacy.bossbar.BossFlag.values()[flag.ordinal()]);
-        return this;
-    }
-
-    public boolean hasFlag(BossFlag flag) {
-        return bossBar.hasFlag(com.viaversion.viaversion.api.legacy.bossbar.BossFlag.values()[flag.ordinal()]);
-    }
-
-    public Set<UUID> getPlayers() {
-        return bossBar.getPlayers();
-    }
-
-    public BossBar show() {
-        bossBar.show();
-        return this;
-    }
-
-    public BossBar hide() {
-        bossBar.hide();
-        return this;
-    }
-
-    public boolean isVisible() {
-        return bossBar.isVisible();
-    }
-
-    public UUID getId() {
-        return bossBar.getId();
-    }
-}

api-legacy/src/main/java/us/myles/ViaVersion/api/protocol/ProtocolVersion.java

@@ -1,254 +0,0 @@
-/*
- * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
- * Copyright (C) 2016-2024 ViaVersion and contributors
- *
- * 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 us.myles.ViaVersion.api.protocol;
-
-import com.google.common.base.Preconditions;
-import com.viaversion.viaversion.api.protocol.version.VersionRange;
-import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.LinkedHashSet;
-import java.util.List;
-import java.util.Set;
-import org.checkerframework.checker.nullness.qual.NonNull;
-import org.checkerframework.checker.nullness.qual.Nullable;
-
-/**
- * @deprecated will no longer be updated and may be removed at some point, use {@link com.viaversion.viaversion.api.protocol.version.ProtocolVersion}
- */
-@Deprecated
-public class ProtocolVersion {
-    private static final Int2ObjectMap<ProtocolVersion> versions = new Int2ObjectOpenHashMap<>();
-    private static final List<ProtocolVersion> versionList = new ArrayList<>();
-
-    public static final ProtocolVersion v1_4_6 = register(51, "1.4.6/7", new VersionRange("1.4", 6, 7));
-    public static final ProtocolVersion v1_5_1 = register(60, "1.5.1");
-    public static final ProtocolVersion v1_5_2 = register(61, "1.5.2");
-    public static final ProtocolVersion v_1_6_1 = register(73, "1.6.1");
-    public static final ProtocolVersion v_1_6_2 = register(74, "1.6.2");
-    public static final ProtocolVersion v_1_6_3 = register(77, "1.6.3");
-    public static final ProtocolVersion v_1_6_4 = register(78, "1.6.4");
-    public static final ProtocolVersion v1_7_1 = register(4, "1.7-1.7.5", new VersionRange("1.7", 0, 5));
-    public static final ProtocolVersion v1_7_6 = register(5, "1.7.6-1.7.10", new VersionRange("1.7", 6, 10));
-    public static final ProtocolVersion v1_8 = register(47, "1.8.x");
-    public static final ProtocolVersion v1_9 = register(107, "1.9");
-    public static final ProtocolVersion v1_9_1 = register(108, "1.9.1");
-    public static final ProtocolVersion v1_9_2 = register(109, "1.9.2");
-    public static final ProtocolVersion v1_9_3 = register(110, "1.9.3/4", new VersionRange("1.9", 3, 4));
-    public static final ProtocolVersion v1_10 = register(210, "1.10.x");
-    public static final ProtocolVersion v1_11 = register(315, "1.11");
-    public static final ProtocolVersion v1_11_1 = register(316, "1.11.1/2", new VersionRange("1.11", 1, 2));
-    public static final ProtocolVersion v1_12 = register(335, "1.12");
-    public static final ProtocolVersion v1_12_1 = register(338, "1.12.1");
-    public static final ProtocolVersion v1_12_2 = register(340, "1.12.2");
-    public static final ProtocolVersion v1_13 = register(393, "1.13");
-    public static final ProtocolVersion v1_13_1 = register(401, "1.13.1");
-    public static final ProtocolVersion v1_13_2 = register(404, "1.13.2");
-    public static final ProtocolVersion v1_14 = register(477, "1.14");
-    public static final ProtocolVersion v1_14_1 = register(480, "1.14.1");
-    public static final ProtocolVersion v1_14_2 = register(485, "1.14.2");
-    public static final ProtocolVersion v1_14_3 = register(490, "1.14.3");
-    public static final ProtocolVersion v1_14_4 = register(498, "1.14.4");
-    public static final ProtocolVersion v1_15 = register(573, "1.15");
-    public static final ProtocolVersion v1_15_1 = register(575, "1.15.1");
-    public static final ProtocolVersion v1_15_2 = register(578, "1.15.2");
-    public static final ProtocolVersion v1_16 = register(735, "1.16");
-    public static final ProtocolVersion v1_16_1 = register(736, "1.16.1");
-    public static final ProtocolVersion v1_16_2 = register(751, "1.16.2");
-    public static final ProtocolVersion v1_16_3 = register(753, "1.16.3");
-    public static final ProtocolVersion v1_16_4 = register(754, "1.16.4/5", new VersionRange("1.16", 4, 5));
-    public static final ProtocolVersion v1_17 = register(755, "1.17");
-    public static final ProtocolVersion v1_17_1 = register(756, "1.17.1");
-    public static final ProtocolVersion v1_18 = register(757, "1.18/1.18.1", new VersionRange("1.18", 0, 1));
-    public static final ProtocolVersion v1_18_2 = register(758, "1.18.2");
-    public static final ProtocolVersion v1_19 = register(759, "1.19");
-    public static final ProtocolVersion v1_19_1 = register(760, "1.19.1/2", new VersionRange("1.19", 1, 2));
-    public static final ProtocolVersion v1_19_3 = register(761, "1.19.3");
-    public static final ProtocolVersion v1_19_4 = register(762, "1.19.4");
-    public static final ProtocolVersion v1_20 = register(763, "1.20/1.20.1", new VersionRange("1.20", 0, 1));
-    public static final ProtocolVersion v1_20_2 = register(764, "1.20.2");
-    public static final ProtocolVersion v1_20_3 = register(765, "1.20.3");
-    public static final ProtocolVersion unknown = register(-1, "UNKNOWN");
-
-    public static ProtocolVersion register(int version, String name) {
-        return register(version, -1, name);
-    }
-
-    public static ProtocolVersion register(int version, int snapshotVersion, String name) {
-        return register(version, snapshotVersion, name, null);
-    }
-
-    public static ProtocolVersion register(int version, String name, @Nullable VersionRange versionRange) {
-        return register(version, -1, name, versionRange);
-    }
-
-    public static ProtocolVersion register(int version, int snapshotVersion, String name, @Nullable VersionRange versionRange) {
-        ProtocolVersion protocol = new ProtocolVersion(version, snapshotVersion, name, versionRange);
-        versionList.add(protocol);
-        versions.put(protocol.getVersion(), protocol);
-        if (protocol.isSnapshot()) {
-            versions.put(protocol.getFullSnapshotVersion(), protocol);
-        }
-        return protocol;
-    }
-
-    public static boolean isRegistered(int id) {
-        return versions.containsKey(id);
-    }
-
-    public static @NonNull ProtocolVersion getProtocol(int id) {
-        ProtocolVersion protocolVersion = versions.get(id);
-        if (protocolVersion != null) {
-            return protocolVersion;
-        } else {
-            return new ProtocolVersion(id, "Unknown (" + id + ")");
-        }
-    }
-
-    public static int getIndex(ProtocolVersion version) {
-        return versionList.indexOf(version);
-    }
-
-    public static List<ProtocolVersion> getProtocols() {
-        return Collections.unmodifiableList(new ArrayList<>(versions.values()));
-    }
-
-    public static @Nullable ProtocolVersion getClosest(String protocol) {
-        for (ProtocolVersion version : versions.values()) {
-            String name = version.getName();
-            if (name.equals(protocol)) {
-                return version;
-            }
-
-            if (version.isVersionWildcard()) {
-                // Test against the major version with and without a minor version
-                String majorVersion = name.substring(0, name.length() - 2);
-                if (majorVersion.equals(protocol) || (protocol.startsWith(name.substring(0, name.length() - 1)))) {
-                    return version;
-                }
-            } else if (version.isRange()) {
-                if (version.getIncludedVersions().contains(protocol)) {
-                    return version;
-                }
-            }
-        }
-        return null;
-    }
-
-    private final int version;
-    private final int snapshotVersion;
-    private final String name;
-    private final boolean versionWildcard;
-    private final Set<String> includedVersions;
-
-    public ProtocolVersion(int version, String name) {
-        this(version, -1, name, null);
-    }
-
-    public ProtocolVersion(int version, int snapshotVersion, String name, @Nullable VersionRange versionRange) {
-        this.version = version;
-        this.snapshotVersion = snapshotVersion;
-        this.name = name;
-        this.versionWildcard = name.endsWith(".x");
-
-        Preconditions.checkArgument(!versionWildcard || versionRange == null, "A version cannot be a wildcard and a range at the same time!");
-        if (versionRange != null) {
-            includedVersions = new LinkedHashSet<>();
-            for (int i = versionRange.rangeFrom(); i <= versionRange.rangeTo(); i++) {
-                if (i == 0) {
-                    includedVersions.add(versionRange.baseVersion()); // Keep both the base version and with ".0" appended
-                }
-
-                includedVersions.add(versionRange.baseVersion() + "." + i);
-            }
-        } else {
-            includedVersions = Collections.singleton(name);
-        }
-    }
-
-    public int getVersion() {
-        return version;
-    }
-
-    public int getSnapshotVersion() {
-        Preconditions.checkArgument(isSnapshot());
-        return snapshotVersion;
-    }
-
-    public int getFullSnapshotVersion() {
-        Preconditions.checkArgument(isSnapshot());
-        return (1 << 30) | snapshotVersion; // Bit indicating snapshot versions
-    }
-
-    public int getOriginalVersion() {
-        return snapshotVersion == -1 ? version : ((1 << 30) | snapshotVersion);
-    }
-
-    public boolean isKnown() {
-        return version != -1;
-    }
-
-    public boolean isRange() {
-        return includedVersions.size() != 1;
-    }
-
-    public Set<String> getIncludedVersions() {
-        return Collections.unmodifiableSet(includedVersions);
-    }
-
-    public boolean isVersionWildcard() {
-        return versionWildcard;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public boolean isSnapshot() {
-        return snapshotVersion != -1;
-    }
-
-    public int getId() {
-        return version;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-
-        ProtocolVersion that = (ProtocolVersion) o;
-        return version == that.version;
-    }
-
-    @Override
-    public int hashCode() {
-        return version;
-    }
-
-    @Override
-    public String toString() {
-        return String.format("%s (%d)", this.name, this.version);
-    }
-}

api/build.gradle.kts

@@ -16,9 +16,9 @@ sourceSets {
 
 dependencies {
     api(libs.fastutil)
-    api(libs.flare)
-    api(libs.flareFastutil)
-    api(libs.vianbt)
+    api(libs.vianbt) {
+        exclude("it.unimi.dsi", "fastutil")
+    }
     api(libs.gson)
     implementation(rootProject.libs.text) {
         exclude("com.google.code.gson", "gson")
@@ -34,5 +34,3 @@ dependencies {
 java {
     withJavadocJar()
 }
-
-publishShadowJar()

api/src/main/java/com/viaversion/viaversion/api/ViaAPI.java

@@ -27,10 +27,13 @@ import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.legacy.LegacyViaAPI;
 import com.viaversion.viaversion.api.platform.ViaPlatform;
 import com.viaversion.viaversion.api.protocol.ProtocolManager;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import com.viaversion.viaversion.api.protocol.version.ServerProtocolVersion;
 import io.netty.buffer.ByteBuf;
 import java.util.SortedSet;
+import java.util.TreeSet;
 import java.util.UUID;
+import java.util.stream.Collectors;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
@@ -53,7 +56,7 @@ public interface ViaAPI<T> {
      * @since 4.0.2
      */
     default int majorVersion() {
-        return 4;
+        return 5;
     }
 
     /**
@@ -63,7 +66,7 @@ public interface ViaAPI<T> {
      * @return API version incremented with meaningful API changes
      */
     default int apiVersion() {
-        return 23;
+        return 26;
     }
 
     /**
@@ -75,12 +78,21 @@ public interface ViaAPI<T> {
 
     /**
      * Returns the protocol version of a player.
-     * This will also retrieve the version from ProtocolSupport if it's being used.
      *
      * @param player the platform's player object, e.g. Bukkit this is Player
      * @return protocol version, for example (47=1.8-1.8.8, 107=1.9, 108=1.9.1), or -1 if no longer connected
      */
-    int getPlayerVersion(T player);
+    default int getPlayerVersion(T player) {
+        return getPlayerProtocolVersion(player).getVersion();
+    }
+
+    /**
+     * Returns the protocol version of a player.
+     *
+     * @param player the platform's player object, e.g. Bukkit this is Player
+     * @return the protocol version object (see {@link ProtocolVersion}), or ProtocolVersion.unknown if not connected
+     */
+    ProtocolVersion getPlayerProtocolVersion(T player);
 
     /**
      * Returns the protocol version of a player.
@@ -88,7 +100,18 @@ public interface ViaAPI<T> {
      * @param uuid UUID of a player
      * @return protocol version, for example (47=1.8-1.8.8, 107=1.9, 108=1.9.1), or -1 if not connected
      */
-    int getPlayerVersion(UUID uuid);
+    default int getPlayerVersion(UUID uuid) {
+        return getPlayerProtocolVersion(uuid).getVersion();
+    }
+
+
+    /**
+     * Returns the protocol version of a player.
+     *
+     * @param uuid UUID of a player
+     * @return the protocol version object (see {@link ProtocolVersion}), or ProtocolVersion.unknown if not connected
+     */
+    ProtocolVersion getPlayerProtocolVersion(UUID uuid);
 
     /**
      * Returns whether Via injected into this player connection.
@@ -131,6 +154,16 @@ public interface ViaAPI<T> {
      */
     void sendRawPacket(UUID uuid, ByteBuf packet);
 
+    @Deprecated
+    default SortedSet<Integer> getSupportedVersions() {
+        return getSupportedProtocolVersions().stream().map(ProtocolVersion::getVersion).collect(Collectors.toCollection(TreeSet::new));
+    }
+
+    @Deprecated
+    default SortedSet<Integer> getFullSupportedVersions() {
+        return getFullSupportedProtocolVersions().stream().map(ProtocolVersion::getVersion).collect(Collectors.toCollection(TreeSet::new));
+    }
+
     /**
      * Returns the supported protocol versions.
      * This method removes any blocked protocol versions.
@@ -138,14 +171,15 @@ public interface ViaAPI<T> {
      * @return a sorted set of protocol versions
      * @see #getFullSupportedVersions() for a full list
      */
-    SortedSet<Integer> getSupportedVersions();
+    SortedSet<ProtocolVersion> getSupportedProtocolVersions();
+
 
     /**
      * Returns the supported protocol versions, including blocked protocols.
      *
      * @return a sorted set of protocol versions
      */
-    SortedSet<Integer> getFullSupportedVersions();
+    SortedSet<ProtocolVersion> getFullSupportedProtocolVersions();
 
     /**
      * Returns legacy api only applicable on/to legacy versions.

api/src/main/java/com/viaversion/viaversion/api/command/ViaSubCommand.java

@@ -26,21 +26,21 @@ import com.viaversion.viaversion.util.ChatColorUtil;
 import java.util.Collections;
 import java.util.List;
 
-public abstract class ViaSubCommand {
+public interface ViaSubCommand {
 
     /**
      * Subcommand name
      *
      * @return The commands name
      */
-    public abstract String name();
+    String name();
 
     /**
      * subcommand description, this'll show in /viaversion list
      *
      * @return The commands description
      */
-    public abstract String description();
+    String description();
 
     /**
      * Usage example:
@@ -48,7 +48,7 @@ public abstract class ViaSubCommand {
      *
      * @return The commands usage
      */
-    public String usage() {
+    default String usage() {
         return name();
     }
 
@@ -57,7 +57,7 @@ public abstract class ViaSubCommand {
      *
      * @return The permission required to use the commands
      */
-    public String permission() {
+    default String permission() {
         return "viaversion.admin." + name();
     }
 
@@ -68,7 +68,7 @@ public abstract class ViaSubCommand {
      * @param args   Arguments
      * @return commands executed succesfully if false, show usage
      */
-    public abstract boolean execute(ViaCommandSender sender, String[] args);
+    boolean execute(ViaCommandSender sender, String[] args);
 
     /**
      * Yay, possibility to implement tab-completion
@@ -77,7 +77,7 @@ public abstract class ViaSubCommand {
      * @param args   args
      * @return tab complete possibilities
      */
-    public List<String> onTabComplete(ViaCommandSender sender, String[] args) {
+    default List<String> onTabComplete(ViaCommandSender sender, String[] args) {
         return Collections.emptyList();
     }
 
@@ -87,7 +87,7 @@ public abstract class ViaSubCommand {
      * @param s string to replace
      * @return output String
      */
-    public static String color(String s) {
+    static String color(String s) {
         return ChatColorUtil.translateAlternateColorCodes(s);
     }
 
@@ -98,7 +98,7 @@ public abstract class ViaSubCommand {
      * @param message message
      * @param args    objects to replace
      */
-    public static void sendMessage(ViaCommandSender sender, String message, Object... args) {
+    default void sendMessage(ViaCommandSender sender, String message, Object... args) {
         sender.sendMessage(color(args == null ? message : String.format(message, args)));
     }
 }

api/src/main/java/com/viaversion/viaversion/api/command/ViaVersionCommand.java

@@ -30,7 +30,7 @@ public interface ViaVersionCommand {
      * Register your own subcommand inside ViaVersion
      *
      * @param command Your own SubCommand instance to handle it.
-     * @throws Exception throws an exception when the subcommand already exists or if it's not valid, example: spacee
+     * @throws IllegalArgumentException throws an exception when the subcommand already exists or if it's not valid, example: spacee
      */
     void registerSubCommand(ViaSubCommand command);
 

api/src/main/java/com/viaversion/viaversion/api/configuration/ViaVersionConfig.java

@@ -27,8 +27,6 @@ import com.viaversion.viaversion.api.connection.StorableObject;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.minecraft.WorldIdentifiers;
 import com.viaversion.viaversion.api.protocol.version.BlockedProtocolVersions;
-import it.unimi.dsi.fastutil.ints.IntSet;
-import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface ViaVersionConfig extends Config {
 
@@ -235,13 +233,6 @@ public interface ViaVersionConfig extends Config {
      */
     boolean isChunkBorderFix();
 
-    /**
-     * Force json transform
-     *
-     * @return true if enabled
-     */
-    boolean isForceJsonTransform();
-
     /**
      * Should we fix nbt array's in json chat messages for 1.12 clients
      *
@@ -272,17 +263,6 @@ public interface ViaVersionConfig extends Config {
      */
     BlockedProtocolVersions blockedProtocolVersions();
 
-    /**
-     * Get the blocked protocols
-     *
-     * @return An Integer list
-     * @deprecated use {@link #blockedProtocolVersions()}
-     */
-    @Deprecated/*(forRemoval = true)*/
-    default IntSet getBlockedProtocols() {
-        return blockedProtocolVersions().singleBlockedVersions();
-    }
-
     /**
      * Get the custom disconnect message
      *
@@ -463,4 +443,25 @@ public interface ViaVersionConfig extends Config {
      * @return true if enabled
      */
     boolean isArmorToggleFix();
+
+    /**
+     * If disabled, tamed cats will be displayed as ocelots to 1.14+ clients on 1.13 servers. Otherwise, ocelots (tamed and untamed) will be displayed as cats.
+     *
+     * @return true if enabled
+     */
+    boolean translateOcelotToCat();
+
+    /**
+     * Returns the value of the "enforce secure chat" setting sent to 1.19+ clients on join.
+     *
+     * @return the value sent to 1.19+ clients on join
+     */
+    boolean enforceSecureChat();
+
+    /**
+     * Handles items with invalid count values (higher than max stack size) on 1.20.3 servers.
+     *
+     * @return true if enabled
+     */
+    boolean handleInvalidItemCount();
 }

api/src/main/java/com/viaversion/viaversion/api/connection/ConnectionManager.java

@@ -54,7 +54,6 @@ public interface ConnectionManager {
      * Returns the frontend UserConnection from the player connected to this proxy server
      * Returns null when there isn't a server or connection was not found
      * When ViaVersion is reloaded, this method may not return some players.
-     * May not return ProtocolSupport players.
      * <p>
      * Note that connections are removed as soon as their channel is closed,
      * so avoid using this method during player quits for example.
@@ -67,7 +66,6 @@ public interface ConnectionManager {
      * Returns the UUID from the frontend connection to this proxy server
      * Returns null when there isn't a server or this connection isn't frontend, or it doesn't have an id
      * When ViaVersion is reloaded, this method may not return some players.
-     * May not return ProtocolSupport players.
      * <p>
      * Note that connections are removed as soon as their channel is closed,
      * so avoid using this method during player quits for example.
@@ -81,7 +79,6 @@ public interface ConnectionManager {
      * May contain duplicated UUIDs on multiple ProtocolInfo.
      * May contain frontend, backend and/or client-sided connections.
      * When ViaVersion is reloaded, this method may not return some players.
-     * May not contain ProtocolSupport players.
      *
      * @return connected UserConnections
      */
@@ -91,7 +88,6 @@ public interface ConnectionManager {
      * Returns a map containing the UUIDs and frontend UserConnections from players connected to this proxy server
      * Returns empty list when there isn't a server
      * When ViaVersion is reloaded, this method may not return some players.
-     * May not contain ProtocolSupport players.
      *
      * @return map containing the UUIDs and frontend UserConnections from players connected to this proxy server
      */

api/src/main/java/com/viaversion/viaversion/api/connection/ProtocolInfo.java

@@ -25,22 +25,12 @@ package com.viaversion.viaversion.api.connection;
 import com.viaversion.viaversion.api.protocol.ProtocolPipeline;
 import com.viaversion.viaversion.api.protocol.packet.Direction;
 import com.viaversion.viaversion.api.protocol.packet.State;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
 import java.util.UUID;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface ProtocolInfo {
 
-    /**
-     * Returns the protocol state the user is currently in.
-     *
-     * @return protocol state
-     * @deprecated server and client can be in different states, use {@link #getClientState()} or {@link #getServerState()}
-     */
-    @Deprecated/*(forRemoval = true)*/
-    default State getState() {
-        return this.getServerState();
-    }
-
     /**
      * Returns the protocol state the client is currently in.
      *
@@ -93,24 +83,36 @@ public interface ProtocolInfo {
     void setServerState(State serverState);
 
     /**
-     * Returns the user's protocol version, or -1 if not set.
+     * Returns the user's protocol version, or null if not set.
      * This is set during the {@link State#HANDSHAKE} state.
      *
-     * @return protocol version, or -1 if not set
+     * @return protocol version, may be unknown
+     * @see ProtocolVersion#isKnown()
      */
-    int getProtocolVersion();
+    ProtocolVersion protocolVersion();
 
-    void setProtocolVersion(int protocolVersion);
+    void setProtocolVersion(ProtocolVersion protocolVersion);
 
     /**
-     * Returns the server protocol version the user is connected to, or -1 if not set.
+     * Returns the server protocol version the user is connected to.
      * This is set during the {@link State#HANDSHAKE} state.
      *
-     * @return server protocol version, or -1 if not set
+     * @return the server protocol version the user is connected to, may be unknown
+     * @see ProtocolVersion#isKnown()
      */
-    int getServerProtocolVersion();
+    ProtocolVersion serverProtocolVersion();
 
-    void setServerProtocolVersion(int serverProtocolVersion);
+    void setServerProtocolVersion(ProtocolVersion protocolVersion);
+
+    @Deprecated
+    default int getProtocolVersion() {
+        return protocolVersion() != null ? protocolVersion().getVersion() : -1;
+    }
+
+    @Deprecated
+    default int getServerProtocolVersion() {
+        return serverProtocolVersion() != null ? serverProtocolVersion().getVersion() : -1;
+    }
 
     /**
      * Returns the username associated with this connection.
@@ -140,12 +142,4 @@ public interface ProtocolInfo {
     ProtocolPipeline getPipeline();
 
     void setPipeline(ProtocolPipeline pipeline);
-
-    /**
-     * Returns the user connection this info represents.
-     *
-     * @return user connection
-     */
-    @Deprecated/*(forRemoval = true)*/
-    UserConnection getUser();
-}
+}

api/src/main/java/com/viaversion/viaversion/api/connection/UserConnection.java

@@ -27,11 +27,11 @@ import com.viaversion.viaversion.api.data.entity.EntityTracker;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.PacketTracker;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
-import com.viaversion.viaversion.exception.CancelException;
 import com.viaversion.viaversion.exception.InformativeException;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
+import io.netty.handler.codec.CodecException;
 import java.util.Collection;
 import java.util.Map;
 import java.util.UUID;
@@ -205,11 +205,10 @@ public interface UserConnection {
      *
      * @param buf            ByteBuf with packet id and packet contents
      * @param cancelSupplier function called with original CancelException for generating the Exception when the packet is cancelled
-     * @throws CancelException      if the packet should be cancelled
+     * @throws CodecException       if the packet should be cancelled (by netty)
      * @throws InformativeException if packet transforming failed
-     * @throws Exception            if any other processing outside of transforming fails
      */
-    void transformClientbound(ByteBuf buf, Function<Throwable, Exception> cancelSupplier) throws Exception;
+    void transformClientbound(ByteBuf buf, Function<Throwable, CodecException> cancelSupplier) throws InformativeException;
 
     /**
      * Transforms the serverbound packet contained in ByteBuf.
@@ -217,11 +216,10 @@ public interface UserConnection {
      * @param buf            ByteBuf with packet id and packet contents
      * @param cancelSupplier Function called with original CancelException for generating the Exception used when
      *                       packet is cancelled
-     * @throws CancelException      if the packet should be cancelled
+     * @throws CodecException       if the packet should be cancelled (by netty)
      * @throws InformativeException if packet transforming failed
-     * @throws Exception            if any other processing outside of transforming fails
      */
-    void transformServerbound(ByteBuf buf, Function<Throwable, Exception> cancelSupplier) throws Exception;
+    void transformServerbound(ByteBuf buf, Function<Throwable, CodecException> cancelSupplier) throws InformativeException;
 
     /**
      * Transforms the packet depending on whether the connection is clientside or not.
@@ -229,7 +227,7 @@ public interface UserConnection {
      * @see #transformClientbound(ByteBuf, Function)
      * @see #transformServerbound(ByteBuf, Function)
      */
-    default void transformOutgoing(ByteBuf buf, Function<Throwable, Exception> cancelSupplier) throws Exception {
+    default void transformOutgoing(ByteBuf buf, Function<Throwable, CodecException> cancelSupplier) throws InformativeException {
         if (isClientSide()) {
             transformServerbound(buf, cancelSupplier);
         } else {
@@ -243,7 +241,7 @@ public interface UserConnection {
      * @see #transformClientbound(ByteBuf, Function)
      * @see #transformServerbound(ByteBuf, Function)
      */
-    default void transformIncoming(ByteBuf buf, Function<Throwable, Exception> cancelSupplier) throws Exception {
+    default void transformIncoming(ByteBuf buf, Function<Throwable, CodecException> cancelSupplier) throws InformativeException {
         if (isClientSide()) {
             transformClientbound(buf, cancelSupplier);
         } else {
@@ -315,20 +313,6 @@ public interface UserConnection {
      */
     boolean shouldApplyBlockProtocol();
 
-    /**
-     * Returns whether the packet limiter applies to this user.
-     *
-     * @return whether the packet limiter applies to this user
-     */
-    boolean isPacketLimiterEnabled();
-
-    /**
-     * Sets the status of the packet limiter.
-     *
-     * @param packetLimiterEnabled whether the packet limiter should be enabled
-     */
-    void setPacketLimiterEnabled(boolean packetLimiterEnabled);
-
     /**
      * Returns a newly generated uuid that will let a packet be passed through without
      * transformig its contents if used together with {@link PacketWrapper#PASSTHROUGH_ID}.

api/src/main/java/com/viaversion/viaversion/api/data/FullMappings.java

@@ -27,7 +27,7 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 /**
  * Mappings containing the full string identifier mappings.
  */
-public interface FullMappings extends Mappings {
+public interface FullMappings extends BiMappings {
 
     /**
      * Returns the unmapped integer id for the given identifier, or -1 if not found.
@@ -49,17 +49,17 @@ public interface FullMappings extends Mappings {
      * Returns the unmapped string identifier for the given mapped id.
      *
      * @param id unmapped id
-     * @return unmapped string identifier
+     * @return unmapped string identifier, or null if out of bounds
      */
-    String identifier(int id);
+    @Nullable String identifier(int id);
 
     /**
      * Returns the mapped string identifier for the given mapped id.
      *
      * @param mappedId mapped id
-     * @return mapped string identifier
+     * @return mapped string identifier, or null if out of bounds
      */
-    String mappedIdentifier(int mappedId);
+    @Nullable String mappedIdentifier(int mappedId);
 
     /**
      * Returns the mapped string identifier for the given unmapped identifier.

api/src/main/java/com/viaversion/viaversion/api/data/FullMappingsBase.java

@@ -22,6 +22,7 @@
  */
 package com.viaversion.viaversion.api.data;
 
+import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.util.Key;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
@@ -37,6 +38,7 @@ public class FullMappingsBase implements FullMappings {
     private final Mappings mappings;
 
     public FullMappingsBase(final List<String> unmappedIdentifiers, final List<String> mappedIdentifiers, final Mappings mappings) {
+        Preconditions.checkNotNull(mappings, "Mappings cannot be null");
         this.mappings = mappings;
         this.stringToId = toInverseMap(unmappedIdentifiers);
         this.mappedStringToId = toInverseMap(mappedIdentifiers);
@@ -52,6 +54,15 @@ public class FullMappingsBase implements FullMappings {
         this.mappings = mappings;
     }
 
+    private static Object2IntMap<String> toInverseMap(final List<String> list) {
+        final Object2IntMap<String> map = new Object2IntOpenHashMap<>(list.size());
+        map.defaultReturnValue(-1);
+        for (int i = 0; i < list.size(); i++) {
+            map.put(list.get(i), i);
+        }
+        return map;
+    }
+
     @Override
     public int id(final String identifier) {
         return stringToId.getInt(Key.stripMinecraftNamespace(identifier));
@@ -64,12 +75,20 @@ public class FullMappingsBase implements FullMappings {
 
     @Override
     public String identifier(final int id) {
+        if (id < 0 || id >= idToString.length) {
+            return null;
+        }
+
         final String identifier = idToString[id];
         return Key.namespaced(identifier);
     }
 
     @Override
     public String mappedIdentifier(final int mappedId) {
+        if (mappedId < 0 || mappedId >= mappedIdToString.length) {
+            return null;
+        }
+
         final String identifier = mappedIdToString[mappedId];
         return Key.namespaced(identifier);
     }
@@ -109,13 +128,4 @@ public class FullMappingsBase implements FullMappings {
     public FullMappings inverse() {
         return new FullMappingsBase(mappedStringToId, stringToId, mappedIdToString, idToString, mappings.inverse());
     }
-
-    private static Object2IntMap<String> toInverseMap(final List<String> list) {
-        final Object2IntMap<String> map = new Object2IntOpenHashMap<>(list.size());
-        map.defaultReturnValue(-1);
-        for (int i = 0; i < list.size(); i++) {
-            map.put(list.get(i), i);
-        }
-        return map;
-    }
 }

api/src/main/java/com/viaversion/viaversion/api/data/IdentityMappings.java

@@ -22,15 +22,7 @@
  */
 package com.viaversion.viaversion.api.data;
 
-public class IdentityMappings implements Mappings {
-
-    private final int size;
-    private final int mappedSize;
-
-    public IdentityMappings(final int size, final int mappedSize) {
-        this.size = size;
-        this.mappedSize = mappedSize;
-    }
+public record IdentityMappings(int size, int mappedSize) implements Mappings {
 
     @Override
     public int getNewId(final int id) {
@@ -42,16 +34,6 @@ public class IdentityMappings implements Mappings {
         throw new UnsupportedOperationException();
     }
 
-    @Override
-    public int size() {
-        return size;
-    }
-
-    @Override
-    public int mappedSize() {
-        return mappedSize;
-    }
-
     @Override
     public Mappings inverse() {
         return new IdentityMappings(mappedSize, size);

api/src/main/java/com/viaversion/viaversion/api/data/MappingData.java

@@ -79,6 +79,8 @@ public interface MappingData {
      */
     int getNewParticleId(int id);
 
+    int getNewAttributeId(int id);
+
     /**
      * Returns a list of tags to send if present.
      *
@@ -87,8 +89,21 @@ public interface MappingData {
      */
     @Nullable List<TagData> getTags(RegistryType type);
 
+    /**
+     * Returns item mappings.
+     *
+     * @return item mappings
+     */
     @Nullable BiMappings getItemMappings();
 
+    /**
+     * Returns item mappings if they also have identifier data present.
+     *
+     * @return item mappings if they also have identifier data present
+     * @see #getItemMappings()
+     */
+    @Nullable FullMappings getFullItemMappings();
+
     @Nullable ParticleMappings getParticleMappings();
 
     @Nullable Mappings getBlockMappings();
@@ -105,9 +120,15 @@ public interface MappingData {
 
     @Nullable Mappings getEnchantmentMappings();
 
+    @Nullable Mappings getAttributeMappings();
+
+    @Nullable Mappings getPaintingMappings();
+
     @Nullable FullMappings getEntityMappings();
 
     @Nullable FullMappings getArgumentTypeMappings();
 
-    @Nullable Mappings getPaintingMappings();
+    @Nullable FullMappings getRecipeSerializerMappings();
+
+    @Nullable FullMappings getDataComponentSerializerMappings();
 }

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataBase.java

@@ -22,10 +22,9 @@
  */
 package com.viaversion.viaversion.api.data;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
-import com.github.steveice10.opennbt.tag.builtin.IntArrayTag;
-import com.github.steveice10.opennbt.tag.builtin.ListTag;
-import com.github.steveice10.opennbt.tag.builtin.Tag;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.IntArrayTag;
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.api.minecraft.RegistryType;
 import com.viaversion.viaversion.api.minecraft.TagData;
@@ -34,7 +33,6 @@ import java.util.EnumMap;
 import java.util.List;
 import java.util.Map;
 import java.util.logging.Logger;
-import java.util.stream.Collectors;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class MappingDataBase implements MappingData {
@@ -44,6 +42,8 @@ public class MappingDataBase implements MappingData {
     protected BiMappings itemMappings;
     protected FullMappings argumentTypeMappings;
     protected FullMappings entityMappings;
+    protected FullMappings recipeSerializerMappings;
+    protected FullMappings itemDataSerializerMappings;
     protected ParticleMappings particleMappings;
     protected Mappings blockMappings;
     protected Mappings blockStateMappings;
@@ -53,6 +53,7 @@ public class MappingDataBase implements MappingData {
     protected Mappings enchantmentMappings;
     protected Mappings paintingMappings;
     protected Mappings menuMappings;
+    protected Mappings attributeMappings;
     protected Map<RegistryType, List<TagData>> tags;
 
     public MappingDataBase(final String unmappedVersion, final String mappedVersion) {
@@ -66,7 +67,7 @@ public class MappingDataBase implements MappingData {
             getLogger().info("Loading " + unmappedVersion + " -> " + mappedVersion + " mappings...");
         }
 
-        final CompoundTag data = readNBTFile("mappings-" + unmappedVersion + "to" + mappedVersion + ".nbt");
+        final CompoundTag data = readMappingsFile("mappings-" + unmappedVersion + "to" + mappedVersion + ".nbt");
         blockMappings = loadMappings(data, "blocks");
         blockStateMappings = loadMappings(data, "blockstates");
         blockEntityMappings = loadMappings(data, "blockentities");
@@ -75,48 +76,76 @@ public class MappingDataBase implements MappingData {
         menuMappings = loadMappings(data, "menus");
         enchantmentMappings = loadMappings(data, "enchantments");
         paintingMappings = loadMappings(data, "paintings");
-        itemMappings = loadBiMappings(data, "items");
+        attributeMappings = loadMappings(data, "attributes");
 
-        final CompoundTag unmappedIdentifierData = MappingDataLoader.loadNBT("identifiers-" + unmappedVersion + ".nbt", true);
-        final CompoundTag mappedIdentifierData = MappingDataLoader.loadNBT("identifiers-" + mappedVersion + ".nbt", true);
+
+        final CompoundTag unmappedIdentifierData = readUnmappedIdentifiersFile("identifiers-" + unmappedVersion + ".nbt");
+        final CompoundTag mappedIdentifierData = readMappedIdentifiersFile("identifiers-" + mappedVersion + ".nbt");
         if (unmappedIdentifierData != null && mappedIdentifierData != null) {
+            itemMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "items");
             entityMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "entities");
             argumentTypeMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "argumenttypes");
+            recipeSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "recipe_serializers");
+            itemDataSerializerMappings = loadFullMappings(data, unmappedIdentifierData, mappedIdentifierData, "data_component_type");
 
-            final ListTag unmappedParticles = unmappedIdentifierData.get("particles");
-            final ListTag mappedParticles = mappedIdentifierData.get("particles");
+            final List<String> unmappedParticles = identifiersFromGlobalIds(unmappedIdentifierData, "particles");
+            final List<String> mappedParticles = identifiersFromGlobalIds(mappedIdentifierData, "particles");
             if (unmappedParticles != null && mappedParticles != null) {
                 Mappings particleMappings = loadMappings(data, "particles");
                 if (particleMappings == null) {
                     particleMappings = new IdentityMappings(unmappedParticles.size(), mappedParticles.size());
                 }
-
-                final List<String> identifiers = unmappedParticles.getValue().stream().map(t -> (String) t.getValue()).collect(Collectors.toList());
-                final List<String> mappedIdentifiers = mappedParticles.getValue().stream().map(t -> (String) t.getValue()).collect(Collectors.toList());
-                this.particleMappings = new ParticleMappings(identifiers, mappedIdentifiers, particleMappings);
+                this.particleMappings = new ParticleMappings(unmappedParticles, mappedParticles, particleMappings);
             }
+        } else {
+            // Might not have identifiers in older versions
+            itemMappings = loadBiMappings(data, "items");
         }
 
-        final CompoundTag tagsTag = data.get("tags");
+        final CompoundTag tagsTag = data.getCompoundTag("tags");
         if (tagsTag != null) {
             this.tags = new EnumMap<>(RegistryType.class);
             loadTags(RegistryType.ITEM, tagsTag);
             loadTags(RegistryType.BLOCK, tagsTag);
+            loadTags(RegistryType.ENTITY, tagsTag);
         }
 
         loadExtras(data);
     }
 
-    protected @Nullable CompoundTag readNBTFile(final String name) {
-        return MappingDataLoader.loadNBT(name);
+    protected @Nullable List<String> identifiersFromGlobalIds(final CompoundTag mappingsTag, final String key) {
+        return MappingDataLoader.INSTANCE.identifiersFromGlobalIds(mappingsTag, key);
+    }
+
+    protected @Nullable CompoundTag readMappingsFile(final String name) {
+        return MappingDataLoader.INSTANCE.loadNBT(name);
+    }
+
+    protected @Nullable CompoundTag readUnmappedIdentifiersFile(final String name) {
+        return MappingDataLoader.INSTANCE.loadNBT(name, true);
+    }
+
+    protected @Nullable CompoundTag readMappedIdentifiersFile(final String name) {
+        return MappingDataLoader.INSTANCE.loadNBT(name, true);
     }
 
     protected @Nullable Mappings loadMappings(final CompoundTag data, final String key) {
-        return MappingDataLoader.loadMappings(data, key);
+        return MappingDataLoader.INSTANCE.loadMappings(data, key);
     }
 
-    protected @Nullable FullMappings loadFullMappings(final CompoundTag data, final CompoundTag unmappedIdentifiers, final CompoundTag mappedIdentifiers, final String key) {
-        return MappingDataLoader.loadFullMappings(data, unmappedIdentifiers, mappedIdentifiers, key);
+    protected @Nullable FullMappings loadFullMappings(final CompoundTag data, final CompoundTag unmappedIdentifiersTag, final CompoundTag mappedIdentifiersTag, final String key) {
+        if (!unmappedIdentifiersTag.contains(key) || !mappedIdentifiersTag.contains(key)) {
+            return null;
+        }
+
+        final List<String> unmappedIdentifiers = identifiersFromGlobalIds(unmappedIdentifiersTag, key);
+        final List<String> mappedIdentifiers = identifiersFromGlobalIds(mappedIdentifiersTag, key);
+        Mappings mappings = loadBiMappings(data, key); // Load as bi-mappings to keep the inverse cached
+        if (mappings == null) {
+            mappings = new IdentityMappings(unmappedIdentifiers.size(), mappedIdentifiers.size());
+        }
+
+        return new FullMappingsBase(unmappedIdentifiers, mappedIdentifiers, mappings);
     }
 
     protected @Nullable BiMappings loadBiMappings(final CompoundTag data, final String key) {
@@ -125,7 +154,7 @@ public class MappingDataBase implements MappingData {
     }
 
     private void loadTags(final RegistryType type, final CompoundTag data) {
-        final CompoundTag tag = data.get(type.resourceLocation());
+        final CompoundTag tag = data.getCompoundTag(type.resourceLocation());
         if (tag == null) {
             return;
         }
@@ -164,6 +193,11 @@ public class MappingDataBase implements MappingData {
         return checkValidity(id, particleMappings.getNewId(id), "particles");
     }
 
+    @Override
+    public int getNewAttributeId(final int id) {
+        return checkValidity(id, attributeMappings.getNewId(id), "attributes");
+    }
+
     @Override
     public @Nullable List<TagData> getTags(final RegistryType type) {
         return tags != null ? tags.get(type) : null;
@@ -174,6 +208,14 @@ public class MappingDataBase implements MappingData {
         return itemMappings;
     }
 
+    @Override
+    public @Nullable FullMappings getFullItemMappings() {
+        if (itemMappings instanceof FullMappings) {
+            return (FullMappings) itemMappings;
+        }
+        return null;
+    }
+
     @Override
     public @Nullable ParticleMappings getParticleMappings() {
         return particleMappings;
@@ -214,6 +256,11 @@ public class MappingDataBase implements MappingData {
         return enchantmentMappings;
     }
 
+    @Override
+    public @Nullable Mappings getAttributeMappings() {
+        return attributeMappings;
+    }
+
     @Override
     public @Nullable FullMappings getEntityMappings() {
         return entityMappings;
@@ -224,11 +271,21 @@ public class MappingDataBase implements MappingData {
         return argumentTypeMappings;
     }
 
+    @Override
+    public @Nullable FullMappings getDataComponentSerializerMappings() {
+        return itemDataSerializerMappings;
+    }
+
     @Override
     public @Nullable Mappings getPaintingMappings() {
         return paintingMappings;
     }
 
+    @Override
+    public @Nullable FullMappings getRecipeSerializerMappings() {
+        return recipeSerializerMappings;
+    }
+
     protected Logger getLogger() {
         return Via.getPlatform().getLogger();
     }
@@ -253,4 +310,4 @@ public class MappingDataBase implements MappingData {
 
     protected void loadExtras(final CompoundTag data) {
     }
-}
+}

api/src/main/java/com/viaversion/viaversion/api/data/MappingDataLoader.java

@@ -22,46 +22,95 @@
  */
 package com.viaversion.viaversion.api.data;
 
-import com.github.steveice10.opennbt.tag.builtin.ByteTag;
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
-import com.github.steveice10.opennbt.tag.builtin.IntArrayTag;
-import com.github.steveice10.opennbt.tag.builtin.IntTag;
-import com.github.steveice10.opennbt.tag.builtin.ListTag;
-import com.github.steveice10.opennbt.tag.io.NBTIO;
-import com.github.steveice10.opennbt.tag.io.TagReader;
 import com.google.common.annotations.Beta;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonIOException;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonSyntaxException;
+import com.viaversion.nbt.io.NBTIO;
+import com.viaversion.nbt.io.TagReader;
+import com.viaversion.nbt.tag.ByteTag;
+import com.viaversion.nbt.tag.CompoundTag;
+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.viaversion.api.Via;
 import com.viaversion.viaversion.util.GsonUtil;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
+import java.util.logging.Logger;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public final class MappingDataLoader {
+public class MappingDataLoader {
 
-    private static final Map<String, CompoundTag> MAPPINGS_CACHE = new HashMap<>();
-    private static final TagReader<CompoundTag> MAPPINGS_READER = NBTIO.reader(CompoundTag.class).named();
+    public static final MappingDataLoader INSTANCE = new MappingDataLoader(MappingDataLoader.class, "assets/viaversion/data/");
+    public static final TagReader<CompoundTag> MAPPINGS_READER = NBTIO.reader(CompoundTag.class).named();
+    private static final Map<String, String[]> GLOBAL_IDENTIFIER_INDEXES = new HashMap<>();
     private static final byte DIRECT_ID = 0;
     private static final byte SHIFTS_ID = 1;
     private static final byte CHANGES_ID = 2;
     private static final byte IDENTITY_ID = 3;
-    private static boolean cacheValid = true;
 
-    public static void clearCache() {
-        MAPPINGS_CACHE.clear();
+    private final Map<String, CompoundTag> mappingsCache = new HashMap<>();
+    private final Class<?> dataLoaderClass;
+    private final String dataPath;
+    private boolean cacheValid = true;
+
+    public MappingDataLoader(final Class<?> dataLoaderClass, final String dataPath) {
+        this.dataLoaderClass = dataLoaderClass;
+        this.dataPath = dataPath;
+    }
+
+    public static void loadGlobalIdentifiers() {
+        // Load in a file with all the identifiers we need, so that we don't need to duplicate them
+        // for every single new version with only a couple of changes in them.
+        final CompoundTag globalIdentifiers = INSTANCE.loadNBT("identifier-table.nbt");
+        for (final Map.Entry<String, Tag> entry : globalIdentifiers.entrySet()) {
+            //noinspection unchecked
+            final ListTag<StringTag> value = (ListTag<StringTag>) entry.getValue();
+            final String[] array = new String[value.size()];
+            for (int i = 0, size = value.size(); i < size; i++) {
+                array[i] = value.get(i).getValue();
+            }
+            GLOBAL_IDENTIFIER_INDEXES.put(entry.getKey(), array);
+        }
+    }
+
+    /**
+     * Returns the global id of the identifier in the registry.
+     *
+     * @param registry registry key
+     * @param globalId global id
+     * @return identifier
+     * @throws IllegalArgumentException if the registry key is invalid
+     */
+    public @Nullable String identifierFromGlobalId(final String registry, final int globalId) {
+        final String[] array = GLOBAL_IDENTIFIER_INDEXES.get(registry);
+        if (array == null) {
+            throw new IllegalArgumentException("Unknown global identifier key: " + registry);
+        }
+        if (globalId < 0 || globalId >= array.length) {
+            throw new IllegalArgumentException("Unknown global identifier index: " + globalId);
+        }
+        return array[globalId];
+    }
+
+    public void clearCache() {
+        mappingsCache.clear();
         cacheValid = false;
     }
 
@@ -70,8 +119,8 @@ public final class MappingDataLoader {
      *
      * @return loaded json object, or null if not found or invalid
      */
-    public static @Nullable JsonObject loadFromDataDir(final String name) {
-        final File file = new File(Via.getPlatform().getDataFolder(), name);
+    public @Nullable JsonObject loadFromDataDir(final String name) {
+        final File file = new File(getDataFolder(), name);
         if (!file.exists()) {
             return loadData(name);
         }
@@ -81,7 +130,7 @@ public final class MappingDataLoader {
             return GsonUtil.getGson().fromJson(reader, JsonObject.class);
         } catch (final JsonSyntaxException e) {
             // Users might mess up the format, so let's catch the syntax error
-            Via.getPlatform().getLogger().warning(name + " is badly formatted!");
+            getLogger().warning(name + " is badly formatted!");
             throw new RuntimeException(e);
         } catch (final IOException | JsonIOException e) {
             throw new RuntimeException(e);
@@ -93,7 +142,7 @@ public final class MappingDataLoader {
      *
      * @return loaded json object from bundled resources if present
      */
-    public static @Nullable JsonObject loadData(final String name) {
+    public @Nullable JsonObject loadData(final String name) {
         final InputStream stream = getResource(name);
         if (stream == null) {
             return null;
@@ -106,12 +155,12 @@ public final class MappingDataLoader {
         }
     }
 
-    public static @Nullable CompoundTag loadNBT(final String name, final boolean cache) {
+    public @Nullable CompoundTag loadNBT(final String name, final boolean cache) {
         if (!cacheValid) {
             return loadNBTFromFile(name);
         }
 
-        CompoundTag data = MAPPINGS_CACHE.get(name);
+        CompoundTag data = mappingsCache.get(name);
         if (data != null) {
             return data;
         }
@@ -119,29 +168,29 @@ public final class MappingDataLoader {
         data = loadNBTFromFile(name);
 
         if (cache && data != null) {
-            MAPPINGS_CACHE.put(name, data);
+            mappingsCache.put(name, data);
         }
         return data;
     }
 
-    public static @Nullable CompoundTag loadNBT(final String name) {
+    public @Nullable CompoundTag loadNBT(final String name) {
         return loadNBT(name, false);
     }
 
-    public static @Nullable CompoundTag loadNBTFromFile(final String name) {
+    public @Nullable CompoundTag loadNBTFromFile(final String name) {
         final InputStream resource = getResource(name);
         if (resource == null) {
             return null;
         }
 
-        try (final InputStream stream = resource) {
+        try (final InputStream stream = new BufferedInputStream(resource)) {
             return MAPPINGS_READER.read(stream);
         } catch (final IOException e) {
             throw new RuntimeException(e);
         }
     }
 
-    public static @Nullable Mappings loadMappings(final CompoundTag mappingsTag, final String key) {
+    public @Nullable Mappings loadMappings(final CompoundTag mappingsTag, final String key) {
         return loadMappings(mappingsTag, key, size -> {
             final int[] array = new int[size];
             Arrays.fill(array, -1);
@@ -150,29 +199,29 @@ public final class MappingDataLoader {
     }
 
     @Beta
-    public static <M extends Mappings, V> @Nullable Mappings loadMappings(
-            final CompoundTag mappingsTag,
-            final String key,
-            final MappingHolderSupplier<V> holderSupplier,
-            final AddConsumer<V> addConsumer,
-            final MappingsSupplier<M, V> mappingsSupplier
+    public <M extends Mappings, V> @Nullable Mappings loadMappings(
+        final CompoundTag mappingsTag,
+        final String key,
+        final MappingHolderSupplier<V> holderSupplier,
+        final AddConsumer<V> addConsumer,
+        final MappingsSupplier<M, V> mappingsSupplier
     ) {
-        final CompoundTag tag = mappingsTag.get(key);
+        final CompoundTag tag = mappingsTag.getCompoundTag(key);
         if (tag == null) {
             return null;
         }
 
-        final ByteTag serializationStragetyTag = tag.get("id");
-        final IntTag mappedSizeTag = tag.get("mappedSize");
+        final ByteTag serializationStragetyTag = tag.getUnchecked("id");
+        final IntTag mappedSizeTag = tag.getUnchecked("mappedSize");
         final byte strategy = serializationStragetyTag.asByte();
         final V mappings;
         if (strategy == DIRECT_ID) {
-            final IntArrayTag valuesTag = tag.get("val");
+            final IntArrayTag valuesTag = tag.getIntArrayTag("val");
             return IntArrayMappings.of(valuesTag.getValue(), mappedSizeTag.asInt());
         } else if (strategy == SHIFTS_ID) {
-            final IntArrayTag shiftsAtTag = tag.get("at");
-            final IntArrayTag shiftsTag = tag.get("to");
-            final IntTag sizeTag = tag.get("size");
+            final IntArrayTag shiftsAtTag = tag.getIntArrayTag("at");
+            final IntArrayTag shiftsTag = tag.getIntArrayTag("to");
+            final IntTag sizeTag = tag.getUnchecked("size");
             final int[] shiftsAt = shiftsAtTag.getValue();
             final int[] shiftsTo = shiftsTag.getValue();
             final int size = sizeTag.asInt();
@@ -196,9 +245,9 @@ public final class MappingDataLoader {
                 }
             }
         } else if (strategy == CHANGES_ID) {
-            final IntArrayTag changesAtTag = tag.get("at");
-            final IntArrayTag valuesTag = tag.get("val");
-            final IntTag sizeTag = tag.get("size");
+            final IntArrayTag changesAtTag = tag.getIntArrayTag("at");
+            final IntArrayTag valuesTag = tag.getIntArrayTag("val");
+            final IntTag sizeTag = tag.getUnchecked("size");
             final boolean fillBetween = tag.get("nofill") == null;
             final int[] changesAt = changesAtTag.getValue();
             final int[] values = valuesTag.getValue();
@@ -218,7 +267,7 @@ public final class MappingDataLoader {
                 addConsumer.addTo(mappings, id, values[i]);
             }
         } else if (strategy == IDENTITY_ID) {
-            final IntTag sizeTag = tag.get("size");
+            final IntTag sizeTag = tag.getUnchecked("size");
             return new IdentityMappings(sizeTag.asInt(), mappedSizeTag.asInt());
         } else {
             throw new IllegalArgumentException("Unknown serialization strategy: " + strategy);
@@ -226,23 +275,17 @@ public final class MappingDataLoader {
         return mappingsSupplier.create(mappings, mappedSizeTag.asInt());
     }
 
-    public static FullMappings loadFullMappings(final CompoundTag mappingsTag, final CompoundTag unmappedIdentifiers, final CompoundTag mappedIdentifiers, final String key) {
-        final ListTag unmappedElements = unmappedIdentifiers.get(key);
-        final ListTag mappedElements = mappedIdentifiers.get(key);
-        if (unmappedElements == null || mappedElements == null) {
+    public @Nullable List<String> identifiersFromGlobalIds(final CompoundTag mappingsTag, final String key) {
+        final Mappings mappings = loadMappings(mappingsTag, key);
+        if (mappings == null) {
             return null;
         }
 
-        Mappings mappings = loadMappings(mappingsTag, key);
-        if (mappings == null) {
-            mappings = new IdentityMappings(unmappedElements.size(), mappedElements.size());
+        final List<String> identifiers = new ArrayList<>(mappings.size());
+        for (int i = 0; i < mappings.size(); i++) {
+            identifiers.add(identifierFromGlobalId(key, mappings.getNewId(i)));
         }
-
-        return new FullMappingsBase(
-                unmappedElements.getValue().stream().map(t -> (String) t.getValue()).collect(Collectors.toList()),
-                mappedElements.getValue().stream().map(t -> (String) t.getValue()).collect(Collectors.toList()),
-                mappings
-        );
+        return identifiers;
     }
 
     /**
@@ -251,7 +294,7 @@ public final class MappingDataLoader {
      * @param object json object
      * @return map with indexes hashed by their id value
      */
-    public static Object2IntMap<String> indexedObjectToMap(final JsonObject object) {
+    public Object2IntMap<String> indexedObjectToMap(final JsonObject object) {
         final Object2IntMap<String> map = new Object2IntOpenHashMap<>(object.size(), .99F);
         map.defaultReturnValue(-1);
         for (final Map.Entry<String, JsonElement> entry : object.entrySet()) {
@@ -266,7 +309,7 @@ public final class MappingDataLoader {
      * @param array json array
      * @return map with indexes hashed by their id value
      */
-    public static Object2IntMap<String> arrayToMap(final JsonArray array) {
+    public Object2IntMap<String> arrayToMap(final JsonArray array) {
         final Object2IntMap<String> map = new Object2IntOpenHashMap<>(array.size(), .99F);
         map.defaultReturnValue(-1);
         for (int i = 0; i < array.size(); i++) {
@@ -275,8 +318,16 @@ public final class MappingDataLoader {
         return map;
     }
 
-    public static @Nullable InputStream getResource(final String name) {
-        return MappingDataLoader.class.getClassLoader().getResourceAsStream("assets/viaversion/data/" + name);
+    public Logger getLogger() {
+        return Via.getPlatform().getLogger();
+    }
+
+    public File getDataFolder() {
+        return Via.getPlatform().getDataFolder();
+    }
+
+    public @Nullable InputStream getResource(final String name) {
+        return dataLoaderClass.getClassLoader().getResourceAsStream(dataPath + name);
     }
 
     @FunctionalInterface

api/src/main/java/com/viaversion/viaversion/api/data/Mappings.java

@@ -84,10 +84,4 @@ public interface Mappings {
      * @return mappings with keys and values swapped
      */
     Mappings inverse();
-
-    @FunctionalInterface
-    interface MappingsSupplier<T extends Mappings> {
-
-        T supply(int[] mappings, int mappedIds);
-    }
 }

api/src/main/java/com/viaversion/viaversion/api/data/ParticleMappings.java

@@ -35,6 +35,7 @@ public class ParticleMappings extends FullMappingsBase {
         addBlockParticle("block");
         addBlockParticle("falling_dust");
         addBlockParticle("block_marker");
+        addBlockParticle("dust_pillar");
         addItemParticle("item");
     }
 

api/src/main/java/com/viaversion/viaversion/api/data/entity/DimensionData.java

@@ -24,6 +24,8 @@ package com.viaversion.viaversion.api.data.entity;
 
 public interface DimensionData {
 
+    int id();
+
     int minY();
 
     int height();

api/src/main/java/com/viaversion/viaversion/api/data/entity/EntityTracker.java

@@ -34,6 +34,7 @@ public interface EntityTracker {
      *
      * @return user connection
      */
+    @Deprecated
     UserConnection user();
 
     /**
@@ -165,6 +166,8 @@ public interface EntityTracker {
 
     @Nullable DimensionData dimensionData(String dimension);
 
+    @Nullable DimensionData dimensionData(int dimensionId);
+
     void setDimensions(Map<String, DimensionData> dimensions);
 
     /**

api/src/main/java/com/viaversion/viaversion/api/data/entity/TrackedEntity.java

@@ -48,11 +48,11 @@ public interface TrackedEntity {
     boolean hasData();
 
     /**
-     * Returns whether metadata has already been sent at least once for this entity.
+     * Returns whether entity data has already been sent at least once for this entity.
      *
-     * @return whether metadata has already been sent at least once for this entity
+     * @return whether entity data has already been sent at least once for this entity
      */
-    boolean hasSentMetadata();
+    boolean hasSentEntityData();
 
-    void sentMetadata(boolean sentMetadata);
+    void sentEntityData(boolean sentEntityData);
 }

api/src/main/java/com/viaversion/viaversion/api/debug/DebugHandler.java

@@ -29,7 +29,6 @@ import com.viaversion.viaversion.api.protocol.packet.PacketType;
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import java.util.logging.Level;
 
-@Beta
 public interface DebugHandler {
 
     /**
@@ -51,6 +50,7 @@ public interface DebugHandler {
      *
      * @param packetTypeName packet type name
      */
+    @Beta
     void addPacketTypeNameToLog(String packetTypeName);
 
     /**
@@ -59,6 +59,7 @@ public interface DebugHandler {
      *
      * @param packetType packet type
      */
+    @Beta
     void addPacketTypeToLog(PacketType packetType);
 
     /**
@@ -66,11 +67,13 @@ public interface DebugHandler {
      *
      * @param packetTypeName packet type name
      */
+    @Beta
     boolean removePacketTypeNameToLog(String packetTypeName);
 
     /**
      * Resets packet type filters.
      */
+    @Beta
     void clearPacketTypesToLog();
 
     /**
@@ -79,6 +82,7 @@ public interface DebugHandler {
      *
      * @return whether packets should be logged after being transformed
      */
+    @Beta
     boolean logPostPacketTransform();
 
     /**
@@ -86,6 +90,7 @@ public interface DebugHandler {
      *
      * @param logPostPacketTransform whether packets should be logged after being transformed
      */
+    @Beta
     void setLogPostPacketTransform(boolean logPostPacketTransform);
 
     /**
@@ -98,6 +103,7 @@ public interface DebugHandler {
      */
     boolean shouldLog(PacketWrapper wrapper, Direction direction);
 
+    @Beta
     default void enableAndLogIds(final PacketType... packetTypes) {
         setEnabled(true);
         for (final PacketType packetType : packetTypes) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/BlockFace.java

@@ -34,7 +34,6 @@ public enum BlockFace {
     BOTTOM((byte) 0, (byte) -1, (byte) 0, EnumAxis.Y);
 
     public static final BlockFace[] HORIZONTAL = {NORTH, SOUTH, EAST, WEST};
-
     private static final Map<BlockFace, BlockFace> opposites = new EnumMap<>(BlockFace.class);
 
     static {
@@ -78,26 +77,6 @@ public enum BlockFace {
         return axis;
     }
 
-    @Deprecated/*(forRemoval = true)*/
-    public byte getModX() {
-        return modX;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    public byte getModY() {
-        return modY;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    public byte getModZ() {
-        return modZ;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    public EnumAxis getAxis() {
-        return axis;
-    }
-
     public enum EnumAxis {
         X, Y, Z
     }

api/src/main/java/com/viaversion/viaversion/api/minecraft/BlockPosition.java

@@ -22,29 +22,19 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public class Position {
+public class BlockPosition {
     protected final int x;
     protected final int y;
     protected final int z;
 
-    public Position(int x, int y, int z) {
+    public BlockPosition(int x, int y, int z) {
         this.x = x;
         this.y = y;
         this.z = z;
     }
 
-    // @Deprecated/*(forRemoval=true)*/ Just leave this unchecked
-    public Position(int x, short y, int z) {
-        this(x, (int) y, z);
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public Position(Position toCopy) {
-        this(toCopy.x(), toCopy.y(), toCopy.z());
-    }
-
-    public Position getRelative(BlockFace face) {
-        return new Position(x + face.modX(), (short) (y + face.modY()), z + face.modZ());
+    public BlockPosition getRelative(BlockFace face) {
+        return new BlockPosition(x + face.modX(), y + face.modY(), z + face.modZ());
     }
 
     public int x() {
@@ -59,30 +49,15 @@ public class Position {
         return z;
     }
 
-    public GlobalPosition withDimension(String dimension) {
-        return new GlobalPosition(dimension, x, y, z);
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getX() {
-        return x;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getY() {
-        return y;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getZ() {
-        return z;
+    public GlobalBlockPosition withDimension(String dimension) {
+        return new GlobalBlockPosition(dimension, x, y, z);
     }
 
     @Override
     public boolean equals(final Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
-        Position position = (Position) o;
+        BlockPosition position = (BlockPosition) o;
         if (x != position.x) return false;
         if (y != position.y) return false;
         return z == position.z;
@@ -98,10 +73,10 @@ public class Position {
 
     @Override
     public String toString() {
-        return "Position{" +
-                "x=" + x +
-                ", y=" + y +
-                ", z=" + z +
-                '}';
+        return "BlockPosition{" +
+            "x=" + x +
+            ", y=" + y +
+            ", z=" + z +
+            '}';
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/ChunkPosition.java

@@ -20,7 +20,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata;
+package com.viaversion.viaversion.api.minecraft;
 
 import java.util.Objects;
 
@@ -82,8 +82,8 @@ public final class ChunkPosition {
     @Override
     public String toString() {
         return "ChunkPosition{" +
-                "chunkX=" + chunkX +
-                ", chunkZ=" + chunkZ +
-                '}';
+            "chunkX=" + chunkX +
+            ", chunkZ=" + chunkZ +
+            '}';
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/Environment.java

@@ -38,20 +38,11 @@ public enum Environment {
         return id;
     }
 
-    @Deprecated/*(forRemoval = true)*/
-    public int getId() {
-        return id;
-    }
-
     public static Environment getEnvironmentById(int id) {
-        switch (id) {
-            default:
-            case -1:
-                return NETHER;
-            case 0:
-                return NORMAL;
-            case 1:
-                return END;
-        }
+        return switch (id) {
+            case 0 -> NORMAL;
+            case 1 -> END;
+            default -> NETHER; // -1 implicitly
+        };
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/EulerAngle.java

@@ -22,41 +22,5 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public class EulerAngle {
-    private final float x;
-    private final float y;
-    private final float z;
-
-    public EulerAngle(final float x, final float y, final float z) {
-        this.x = x;
-        this.y = y;
-        this.z = z;
-    }
-
-    public float x() {
-        return x;
-    }
-
-    public float y() {
-        return y;
-    }
-
-    public float z() {
-        return z;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    public float getX() {
-        return x;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    public float getY() {
-        return y;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    public float getZ() {
-        return z;
-    }
+public record EulerAngle(float x, float y, float z) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/GameMode.java

@@ -0,0 +1,51 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+public enum GameMode {
+
+    SURVIVAL("Survival Mode"),
+    CREATIVE("Creative Mode"),
+    ADVENTURE("Adventure Mode"),
+    SPECTATOR("Spectator Mode");
+
+    private final String text;
+
+    GameMode(String text) {
+        this.text = text;
+    }
+
+    public String text() {
+        return text;
+    }
+
+    public static GameMode getById(int id) {
+        return switch (id) {
+            case 0 -> SURVIVAL;
+            case 1 -> CREATIVE;
+            case 2 -> ADVENTURE;
+            case 3 -> SPECTATOR;
+            default -> throw new IllegalArgumentException("Unknown gamemode id: " + id);
+        };
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/GameProfile.java

@@ -0,0 +1,32 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+import java.util.UUID;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public record GameProfile(@Nullable String name, @Nullable UUID id, Property[] properties) {
+
+    public record Property(String name, String value, @Nullable String signature) {
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/GlobalBlockPosition.java

@@ -22,10 +22,10 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public final class GlobalPosition extends Position {
+public final class GlobalBlockPosition extends BlockPosition {
     private final String dimension;
 
-    public GlobalPosition(final String dimension, final int x, final int y, final int z) {
+    public GlobalBlockPosition(final String dimension, final int x, final int y, final int z) {
         super(x, y, z);
         this.dimension = dimension;
     }
@@ -38,7 +38,7 @@ public final class GlobalPosition extends Position {
     public boolean equals(final Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
-        final GlobalPosition position = (GlobalPosition) o;
+        final GlobalBlockPosition position = (GlobalBlockPosition) o;
         if (x != position.x) return false;
         if (y != position.y) return false;
         if (z != position.z) return false;
@@ -56,11 +56,11 @@ public final class GlobalPosition extends Position {
 
     @Override
     public String toString() {
-        return "GlobalPosition{" +
-                "dimension='" + dimension + '\'' +
-                ", x=" + x +
-                ", y=" + y +
-                ", z=" + z +
-                '}';
+        return "GlobalBlockPosition{" +
+            "dimension='" + dimension + '\'' +
+            ", x=" + x +
+            ", y=" + y +
+            ", z=" + z +
+            '}';
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/Holder.java

@@ -0,0 +1,82 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+public interface Holder<T> {
+
+    /**
+     * Returns an indirect id holder.
+     *
+     * @param id  the id
+     * @param <T> the type of the value
+     * @return a new holder with the given id
+     * @throws IllegalArgumentException if the id is negative
+     */
+    static <T> Holder<T> of(final int id) {
+        return new HolderImpl<>(id);
+    }
+
+    /**
+     * Returns a direct value holder.
+     *
+     * @param value the value
+     * @param <T>   the type of the value
+     * @return a new direct holder
+     */
+    static <T> Holder<T> of(final T value) {
+        return new HolderImpl<>(value);
+    }
+
+    /**
+     * Returns true if this holder is backed by a direct value.
+     *
+     * @return true if the holder is direct
+     * @see #hasId()
+     */
+    boolean isDirect();
+
+    /**
+     * Returns true if this holder has an id.
+     *
+     * @return true if this holder has an id
+     * @see #isDirect()
+     */
+    boolean hasId();
+
+    /**
+     * Returns the value of this holder.
+     *
+     * @return the value of this holder
+     * @throws IllegalArgumentException if this holder is not direct
+     * @see #isDirect()
+     */
+    T value();
+
+    /**
+     * Returns the id of this holder, or -1 if this holder is direct.
+     *
+     * @return the id of this holder, or -1 if this holder is direct
+     * @see #hasId()
+     */
+    int id();
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderImpl.java

@@ -0,0 +1,71 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+import com.google.common.base.Preconditions;
+
+final class HolderImpl<T> implements Holder<T> {
+
+    private final T value;
+    private final int id;
+
+    HolderImpl(final int id) {
+        Preconditions.checkArgument(id >= 0, "id cannot be negative");
+        this.value = null;
+        this.id = id;
+    }
+
+    HolderImpl(final T value) {
+        this.value = value;
+        this.id = -1;
+    }
+
+    @Override
+    public boolean isDirect() {
+        return id == -1;
+    }
+
+    @Override
+    public boolean hasId() {
+        return id != -1;
+    }
+
+    @Override
+    public T value() {
+        Preconditions.checkArgument(isDirect(), "Holder is not direct");
+        return value;
+    }
+
+    @Override
+    public int id() {
+        return id;
+    }
+
+    @Override
+    public String toString() {
+        return "HolderImpl{" +
+            "value=" + value +
+            ", id=" + id +
+            '}';
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSet.java

@@ -0,0 +1,79 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+/**
+ * Set of ids that either holds a string tag key or an array of ids.
+ */
+public interface HolderSet {
+
+    /**
+     * Creates a new holder set for the given tag.
+     *
+     * @param tagKey the tag key
+     * @return a new holder set
+     */
+    static HolderSet of(final String tagKey) {
+        return new HolderSetImpl(tagKey);
+    }
+
+    /**
+     * Creates a new holder set for the given ids.
+     *
+     * @param ids the direct ids
+     * @return a new holder set
+     */
+    static HolderSet of(final int[] ids) {
+        return new HolderSetImpl(ids);
+    }
+
+    /**
+     * Gets the tag key.
+     *
+     * @return the tag key
+     * @see #hasTagKey()
+     */
+    String tagKey();
+
+    /**
+     * Returns whether this holder set has a tag key.
+     *
+     * @return true if this holder set has a tag key, false if it has direct ids
+     */
+    boolean hasTagKey();
+
+    /**
+     * Gets the direct ids.
+     *
+     * @return direct ids
+     * @see #hasIds()
+     */
+    int[] ids();
+
+    /**
+     * Returns whether this holder set has direct ids.
+     *
+     * @return true if this holder set has direct ids, false if it has a tag key
+     */
+    boolean hasIds();
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/HolderSetImpl.java

@@ -0,0 +1,56 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+import com.viaversion.viaversion.util.EitherImpl;
+
+final class HolderSetImpl extends EitherImpl<String, int[]> implements HolderSet {
+
+    HolderSetImpl(final String tagKey) {
+        super(tagKey, null);
+    }
+
+    HolderSetImpl(final int[] ids) {
+        super(null, ids);
+    }
+
+    @Override
+    public String tagKey() {
+        return left();
+    }
+
+    @Override
+    public boolean hasTagKey() {
+        return isLeft();
+    }
+
+    @Override
+    public int[] ids() {
+        return right();
+    }
+
+    @Override
+    public boolean hasIds() {
+        return isRight();
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/Particle.java

@@ -24,11 +24,12 @@ package com.viaversion.viaversion.api.minecraft;
 
 import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
 import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.util.IdHolder;
 import io.netty.buffer.ByteBuf;
 import java.util.ArrayList;
 import java.util.List;
 
-public final class Particle {
+public final class Particle implements IdHolder {
     private final List<ParticleData<?>> arguments = new ArrayList<>(4);
     private int id;
 
@@ -36,7 +37,8 @@ public final class Particle {
         this.id = id;
     }
 
-    public int getId() {
+    @Override
+    public int id() {
         return id;
     }
 
@@ -66,6 +68,18 @@ public final class Particle {
         arguments.add(index, new ParticleData<>(type, value));
     }
 
+    public <T> void set(final int index, final Type<T> type, final T value) {
+        arguments.set(index, new ParticleData<>(type, value));
+    }
+
+    @Override
+    public String toString() {
+        return "Particle{" +
+            "arguments=" + arguments +
+            ", id=" + id +
+            '}';
+    }
+
     public static final class ParticleData<T> {
         private final Type<T> type;
         private T value;
@@ -87,7 +101,7 @@ public final class Particle {
             this.value = value;
         }
 
-        public void write(final ByteBuf buf) throws Exception {
+        public void write(final ByteBuf buf) {
             type.write(buf, value);
         }
 
@@ -98,9 +112,9 @@ public final class Particle {
         @Override
         public String toString() {
             return "ParticleData{" +
-                    "type=" + type +
-                    ", value=" + value +
-                    '}';
+                "type=" + type +
+                ", value=" + value +
+                '}';
         }
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/PlayerMessageSignature.java

@@ -24,20 +24,5 @@ package com.viaversion.viaversion.api.minecraft;
 
 import java.util.UUID;
 
-public final class PlayerMessageSignature {
-    private final UUID uuid;
-    private final byte[] signatureBytes;
-
-    public PlayerMessageSignature(final UUID uuid, final byte[] signatureBytes) {
-        this.uuid = uuid;
-        this.signatureBytes = signatureBytes;
-    }
-
-    public UUID uuid() {
-        return uuid;
-    }
-
-    public byte[] signatureBytes() {
-        return signatureBytes;
-    }
+public record PlayerMessageSignature(UUID uuid, byte[] signatureBytes) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/ProfileKey.java

@@ -22,26 +22,5 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public final class ProfileKey {
-    private final long expiresAt;
-    private final byte[] publicKey;
-    private final byte[] keySignature;
-
-    public ProfileKey(final long expiresAt, final byte[] publicKey, final byte[] keySignature) {
-        this.expiresAt = expiresAt;
-        this.publicKey = publicKey;
-        this.keySignature = keySignature;
-    }
-
-    public long expiresAt() {
-        return expiresAt;
-    }
-
-    public byte[] publicKey() {
-        return publicKey;
-    }
-
-    public byte[] keySignature() {
-        return keySignature;
-    }
+public record ProfileKey(long expiresAt, byte[] publicKey, byte[] keySignature) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/Quaternion.java

@@ -22,42 +22,5 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public final class Quaternion {
-    private final float x;
-    private final float y;
-    private final float z;
-    private final float w;
-
-    public Quaternion(final float x, final float y, final float z, final float w) {
-        this.x = x;
-        this.y = y;
-        this.z = z;
-        this.w = w;
-    }
-
-    public float x() {
-        return x;
-    }
-
-    public float y() {
-        return y;
-    }
-
-    public float z() {
-        return z;
-    }
-
-    public float w() {
-        return w;
-    }
-
-    @Override
-    public String toString() {
-        return "Quaternion{" +
-                "x=" + x +
-                ", y=" + y +
-                ", z=" + z +
-                ", w=" + w +
-                '}';
-    }
+public record Quaternion(float x, float y, float z, float w) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/RegistryEntry.java

@@ -0,0 +1,33 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft;
+
+import com.viaversion.nbt.tag.Tag;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public record RegistryEntry(String key, @Nullable Tag tag) {
+
+    public RegistryEntry withKey(final String key) {
+        return new RegistryEntry(key, tag != null ? tag.copy() : null);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/SoundEvent.java

@@ -20,24 +20,13 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package us.myles.ViaVersion.api.boss;
+package com.viaversion.viaversion.api.minecraft;
 
-@Deprecated
-public enum BossStyle {
+import org.checkerframework.checker.nullness.qual.Nullable;
 
-    SOLID(0),
-    SEGMENTED_6(1),
-    SEGMENTED_10(2),
-    SEGMENTED_12(3),
-    SEGMENTED_20(4);
+public record SoundEvent(String identifier, @Nullable Float fixedRange) {
 
-    private final int id;
-
-    BossStyle(int id) {
-        this.id = id;
-    }
-
-    public int getId() {
-        return id;
+    public SoundEvent withIdentifier(final String identifier) {
+        return new SoundEvent(identifier, this.fixedRange);
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/TagData.java

@@ -22,20 +22,23 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public final class TagData {
-    private final String identifier;
-    private final int[] entries;
+import java.util.Arrays;
 
-    public TagData(final String identifier, final int[] entries) {
-        this.identifier = identifier;
-        this.entries = entries;
+public record TagData(String identifier, int[] entries) {
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        final TagData tagData = (TagData) o;
+        if (!identifier.equals(tagData.identifier)) return false;
+        return Arrays.equals(entries, tagData.entries);
     }
 
-    public String identifier() {
-        return identifier;
-    }
-
-    public int[] entries() {
-        return entries;
+    @Override
+    public int hashCode() {
+        int result = identifier.hashCode();
+        result = 31 * result + Arrays.hashCode(entries);
+        return result;
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/Vector.java

@@ -22,56 +22,5 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public class Vector {
-    private int blockX;
-    private int blockY;
-    private int blockZ;
-
-    public Vector(int blockX, int blockY, int blockZ) {
-        this.blockX = blockX;
-        this.blockY = blockY;
-        this.blockZ = blockZ;
-    }
-
-    public int blockX() {
-        return blockX;
-    }
-
-    public int blockY() {
-        return blockY;
-    }
-
-    public int blockZ() {
-        return blockZ;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getBlockX() {
-        return blockX;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getBlockY() {
-        return blockY;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getBlockZ() {
-        return blockZ;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public void setBlockX(int blockX) {
-        this.blockX = blockX;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public void setBlockY(int blockY) {
-        this.blockY = blockY;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public void setBlockZ(int blockZ) {
-        this.blockZ = blockZ;
-    }
+public record Vector(int blockX, int blockY, int blockZ) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/Vector3f.java

@@ -22,26 +22,5 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public final class Vector3f {
-    private final float x;
-    private final float y;
-    private final float z;
-
-    public Vector3f(final float x, final float y, final float z) {
-        this.x = x;
-        this.y = y;
-        this.z = z;
-    }
-
-    public float x() {
-        return x;
-    }
-
-    public float y() {
-        return y;
-    }
-
-    public float z() {
-        return z;
-    }
+public record Vector3f(float x, float y, float z) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/VillagerData.java

@@ -22,41 +22,5 @@
  */
 package com.viaversion.viaversion.api.minecraft;
 
-public class VillagerData {
-    private final int type;
-    private final int profession;
-    private final int level;
-
-    public VillagerData(final int type, final int profession, final int level) {
-        this.type = type;
-        this.profession = profession;
-        this.level = level;
-    }
-
-    public int type() {
-        return type;
-    }
-
-    public int profession() {
-        return profession;
-    }
-
-    public int level() {
-        return level;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getType() {
-        return type;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getProfession() {
-        return profession;
-    }
-
-    @Deprecated/*(forRemoval=true)*/
-    public int getLevel() {
-        return level;
-    }
+public record VillagerData(int type, int profession, int level) {
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/WorldIdentifiers.java

@@ -24,34 +24,12 @@ package com.viaversion.viaversion.api.minecraft;
 
 import com.viaversion.viaversion.api.connection.StorableObject;
 
-public class WorldIdentifiers implements StorableObject {
+public record WorldIdentifiers(String overworld, String nether, String end) implements StorableObject {
     public static final String OVERWORLD_DEFAULT = "minecraft:overworld";
     public static final String NETHER_DEFAULT = "minecraft:the_nether";
     public static final String END_DEFAULT = "minecraft:the_end";
 
-    private final String overworld;
-    private final String nether;
-    private final String end;
-
     public WorldIdentifiers(String overworld) {
         this(overworld, NETHER_DEFAULT, END_DEFAULT);
     }
-
-    public WorldIdentifiers(String overworld, String nether, String end) {
-        this.overworld = overworld;
-        this.nether = nether;
-        this.end = end;
-    }
-
-    public String overworld() {
-        return this.overworld;
-    }
-
-    public String nether() {
-        return this.nether;
-    }
-
-    public String end() {
-        return this.end;
-    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/blockentity/BlockEntity.java

@@ -22,7 +22,7 @@
  */
 package com.viaversion.viaversion.api.minecraft.blockentity;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.nbt.tag.CompoundTag;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface BlockEntity {

api/src/main/java/com/viaversion/viaversion/api/minecraft/blockentity/BlockEntityImpl.java

@@ -22,40 +22,9 @@
  */
 package com.viaversion.viaversion.api.minecraft.blockentity;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.nbt.tag.CompoundTag;
 
-public final class BlockEntityImpl implements BlockEntity {
-    private final byte packedXZ;
-    private final short y;
-    private final int typeId;
-    private final CompoundTag tag;
-
-    public BlockEntityImpl(final byte packedXZ, final short y, final int typeId, final CompoundTag tag) {
-        this.packedXZ = packedXZ;
-        this.y = y;
-        this.typeId = typeId;
-        this.tag = tag;
-    }
-
-    @Override
-    public byte packedXZ() {
-        return packedXZ;
-    }
-
-    @Override
-    public short y() {
-        return y;
-    }
-
-    @Override
-    public int typeId() {
-        return typeId;
-    }
-
-    @Override
-    public CompoundTag tag() {
-        return tag;
-    }
+public record BlockEntityImpl(byte packedXZ, short y, int typeId, CompoundTag tag) implements BlockEntity {
 
     @Override
     public BlockEntity withTypeId(int typeId) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/BaseChunk.java

@@ -22,7 +22,7 @@
  */
 package com.viaversion.viaversion.api.minecraft.chunks;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.viaversion.api.minecraft.blockentity.BlockEntity;
 import java.util.BitSet;
 import java.util.List;

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/Chunk.java

@@ -22,7 +22,7 @@
  */
 package com.viaversion.viaversion.api.minecraft.chunks;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.viaversion.api.minecraft.blockentity.BlockEntity;
 import java.util.BitSet;
 import java.util.List;

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/Chunk1_18.java

@@ -22,7 +22,7 @@
  */
 package com.viaversion.viaversion.api.minecraft.chunks;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.nbt.tag.CompoundTag;
 import com.viaversion.viaversion.api.minecraft.blockentity.BlockEntity;
 import java.util.BitSet;
 import java.util.List;

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/ChunkSection.java

@@ -52,86 +52,6 @@ public interface ChunkSection {
         return idx >> 4 & 0xF;
     }
 
-    @Deprecated/*(forRemoval = true)*/
-    default int getFlatBlock(int idx) {
-        return palette(PaletteType.BLOCKS).idAt(idx);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default int getFlatBlock(int x, int y, int z) {
-        return getFlatBlock(index(x, y, z));
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void setFlatBlock(int idx, int id) {
-        palette(PaletteType.BLOCKS).setIdAt(idx, id);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void setFlatBlock(int x, int y, int z, int id) {
-        setFlatBlock(index(x, y, z), id);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default int getBlockWithoutData(int x, int y, int z) {
-        return getFlatBlock(x, y, z) >> 4;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default int getBlockData(int x, int y, int z) {
-        return getFlatBlock(x, y, z) & 0xF;
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void setBlockWithData(int x, int y, int z, int type, int data) {
-        setFlatBlock(index(x, y, z), type << 4 | (data & 0xF));
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void setBlockWithData(int idx, int type, int data) {
-        setFlatBlock(idx, type << 4 | (data & 0xF));
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void setPaletteIndex(int idx, int index) {
-        palette(PaletteType.BLOCKS).setPaletteIndexAt(idx, index);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default int getPaletteIndex(int idx) {
-        return palette(PaletteType.BLOCKS).paletteIndexAt(idx);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default int getPaletteSize() {
-        return palette(PaletteType.BLOCKS).size();
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default int getPaletteEntry(int index) {
-        return palette(PaletteType.BLOCKS).idByIndex(index);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void setPaletteEntry(int index, int id) {
-        palette(PaletteType.BLOCKS).setIdByIndex(index, id);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void replacePaletteEntry(int oldId, int newId) {
-        palette(PaletteType.BLOCKS).replaceId(oldId, newId);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void addPaletteEntry(int id) {
-        palette(PaletteType.BLOCKS).addId(id);
-    }
-
-    @Deprecated/*(forRemoval = true)*/
-    default void clearPalette() {
-        palette(PaletteType.BLOCKS).clear();
-    }
-
     /**
      * Returns the number of non-air blocks in this section.
      *

api/src/main/java/com/viaversion/viaversion/api/minecraft/chunks/DataPaletteImpl.java

@@ -137,6 +137,7 @@ public final class DataPaletteImpl implements DataPalette {
 
     interface ChunkData {
         int get(int idx);
+
         void set(int idx, int val);
     }
 

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/EmptyStructuredData.java

@@ -0,0 +1,94 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.data;
+
+import io.netty.buffer.ByteBuf;
+
+final class EmptyStructuredData<T> implements StructuredData<T> {
+
+    private final StructuredDataKey<T> key;
+    private int id;
+
+    EmptyStructuredData(final StructuredDataKey<T> key, final int id) {
+        this.key = key;
+        this.id = id;
+    }
+
+    @Override
+    public void setValue(final T value) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void write(final ByteBuf buffer) {
+    }
+
+    @Override
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    @Override
+    public StructuredDataKey<T> key() {
+        return this.key;
+    }
+
+    @Override
+    public T value() {
+        return null;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return true;
+    }
+
+    @Override
+    public int id() {
+        return this.id;
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        final EmptyStructuredData<?> that = (EmptyStructuredData<?>) o;
+        if (id != that.id) return false;
+        return key.equals(that.key);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = key.hashCode();
+        result = 31 * result + id;
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "EmptyStructuredData{" +
+            "key=" + key +
+            ", id=" + id +
+            '}';
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/FilledStructuredData.java

@@ -0,0 +1,103 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.data;
+
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import java.util.Objects;
+
+final class FilledStructuredData<T> implements StructuredData<T> {
+
+    private final StructuredDataKey<T> key;
+    private T value;
+    private int id;
+
+    FilledStructuredData(final StructuredDataKey<T> key, final T value, final int id) {
+        Preconditions.checkNotNull(key);
+        this.key = key;
+        this.value = value;
+        this.id = id;
+    }
+
+    @Override
+    public void setValue(final T value) {
+        this.value = value;
+    }
+
+    @Override
+    public void write(final ByteBuf buffer) {
+        key.type().write(buffer, value);
+    }
+
+    @Override
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    @Override
+    public StructuredDataKey<T> key() {
+        return key;
+    }
+
+    @Override
+    public T value() {
+        return value;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return false;
+    }
+
+    @Override
+    public int id() {
+        return id;
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        final FilledStructuredData<?> that = (FilledStructuredData<?>) o;
+        if (id != that.id) return false;
+        if (!key.equals(that.key)) return false;
+        return Objects.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = key.hashCode();
+        result = 31 * result + (value != null ? value.hashCode() : 0);
+        result = 31 * result + id;
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "FilledStructuredData{" +
+            "key=" + key +
+            ", value=" + value +
+            ", id=" + id +
+            '}';
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredData.java

@@ -0,0 +1,80 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.data;
+
+import com.viaversion.viaversion.util.IdHolder;
+import io.netty.buffer.ByteBuf;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public interface StructuredData<T> extends IdHolder {
+
+    /**
+     * Returns filled structured data, equivalent to an Optional with a value in vanilla.
+     *
+     * @param key   serializer key
+     * @param value value
+     * @param id    serializer id
+     * @param <T>   serializer type
+     * @return filled structured data
+     */
+    static <T> StructuredData<T> of(final StructuredDataKey<T> key, final T value, final int id) {
+        return new FilledStructuredData<>(key, value, id);
+    }
+
+    /**
+     * Returns empty structured data, equivalent to an empty Optional in vanilla.
+     *
+     * @param key serializer key
+     * @param id  serializer id
+     * @return empty structured data
+     */
+    static <T> StructuredData<T> empty(final StructuredDataKey<T> key, final int id) {
+        return new EmptyStructuredData<>(key, id);
+    }
+
+    void setValue(final T value);
+
+    void write(final ByteBuf buffer);
+
+    void setId(final int id);
+
+    StructuredDataKey<T> key();
+
+    @Nullable T value();
+
+    /**
+     * Returns whether the structured data is present. Even if true, the value may be null.
+     *
+     * @return true if the structured data is present
+     */
+    default boolean isPresent() {
+        return !isEmpty();
+    }
+
+    /**
+     * Returns whether the structured data is empty. Not to be confused with a null value.
+     *
+     * @return true if the structured data is empty
+     */
+    boolean isEmpty();
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataContainer.java

@@ -0,0 +1,170 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.data;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.FullMappings;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.util.Unit;
+import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap;
+import java.util.Map;
+import java.util.function.Function;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class StructuredDataContainer {
+
+    private final Map<StructuredDataKey<?>, StructuredData<?>> data;
+    private FullMappings lookup;
+    private boolean mappedNames;
+
+    public StructuredDataContainer(final Map<StructuredDataKey<?>, StructuredData<?>> data) {
+        this.data = data;
+    }
+
+    public StructuredDataContainer(final StructuredData<?>[] dataArray) {
+        this(new Reference2ObjectOpenHashMap<>(dataArray.length));
+        for (final StructuredData<?> data : dataArray) {
+            this.data.put(data.key(), data);
+        }
+    }
+
+    public StructuredDataContainer() {
+        this(new Reference2ObjectOpenHashMap<>());
+    }
+
+    /**
+     * Returns structured data by id if present.
+     *
+     * @param key serializer id
+     * @param <T> data type
+     * @return structured data
+     */
+    public @Nullable <T> StructuredData<T> get(final StructuredDataKey<T> key) {
+        //noinspection unchecked
+        return (StructuredData<T>) this.data.get(key);
+    }
+
+    /**
+     * Returns structured data by id if not empty.
+     *
+     * @param key serializer id
+     * @param <T> data type
+     * @return structured data if not empty
+     */
+    public @Nullable <T> StructuredData<T> getNonEmpty(final StructuredDataKey<T> key) {
+        //noinspection unchecked
+        final StructuredData<T> data = (StructuredData<T>) this.data.get(key);
+        return data != null && data.isPresent() ? data : null;
+    }
+
+    /**
+     * Returns structured data by id if not empty, or creates it.
+     *
+     * @param key             serializer id
+     * @param mappingFunction function to create structured data if not present
+     * @param <T>             data type
+     * @return structured data if not empty
+     */
+    public <T> StructuredData<T> computeIfAbsent(final StructuredDataKey<T> key, final Function<StructuredDataKey<T>, T> mappingFunction) {
+        final StructuredData<T> data = this.getNonEmpty(key);
+        if (data != null) {
+            return data;
+        }
+
+        final int id = serializerId(key);
+        final StructuredData<T> empty = StructuredData.of(key, mappingFunction.apply(key), id);
+        this.data.put(key, empty);
+        return empty;
+    }
+
+    public <T> void set(final StructuredDataKey<T> key, final T value) {
+        final int id = serializerId(key);
+        if (id != -1) {
+            this.data.put(key, StructuredData.of(key, value, id));
+        }
+    }
+
+    public void set(final StructuredDataKey<Unit> key) {
+        this.set(key, Unit.INSTANCE);
+    }
+
+    public void addEmpty(final StructuredDataKey<?> key) {
+        // Empty optional to override the Minecraft default
+        this.data.put(key, StructuredData.empty(key, serializerId(key)));
+    }
+
+    /**
+     * Removes and returns structured data by the given key.
+     *
+     * @param key serializer key
+     * @param <T> data type
+     * @return removed structured data
+     */
+    public @Nullable <T> StructuredData<T> remove(final StructuredDataKey<T> key) {
+        final StructuredData<?> data = this.data.remove(key);
+        //noinspection unchecked
+        return data != null ? (StructuredData<T>) data : null;
+    }
+
+    public boolean contains(final StructuredDataKey<?> key) {
+        return this.data.containsKey(key);
+    }
+
+    /**
+     * Sets the lookup for serializer ids. Required to call most of the other methods.
+     *
+     * @param protocol    protocol to retreive the id of the serializer from
+     * @param mappedNames if the names are mapped (true if structures from the mapped version are added, false for the unmapped version)
+     */
+    public void setIdLookup(final Protocol<?, ?, ?, ?> protocol, final boolean mappedNames) {
+        this.lookup = protocol.getMappingData().getDataComponentSerializerMappings();
+        Preconditions.checkNotNull(this.lookup, "Data component serializer mappings are null");
+        this.mappedNames = mappedNames;
+    }
+
+    public StructuredDataContainer copy() {
+        final StructuredDataContainer copy = new StructuredDataContainer(new Reference2ObjectOpenHashMap<>(data));
+        copy.lookup = this.lookup;
+        return copy;
+    }
+
+    private int serializerId(final StructuredDataKey<?> key) {
+        final int id = mappedNames ? lookup.mappedId(key.identifier()) : lookup.id(key.identifier());
+        if (id == -1) {
+            Via.getPlatform().getLogger().severe("Could not find item data serializer for type " + key);
+        }
+        return id;
+    }
+
+    public Map<StructuredDataKey<?>, StructuredData<?>> data() {
+        return data;
+    }
+
+    @Override
+    public String toString() {
+        return "StructuredDataContainer{" +
+            "data=" + data +
+            '}';
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/data/StructuredDataKey.java

@@ -0,0 +1,121 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.data;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.Tag;
+import com.viaversion.viaversion.api.minecraft.GameProfile;
+import com.viaversion.viaversion.api.minecraft.Holder;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.item.data.AdventureModePredicate;
+import com.viaversion.viaversion.api.minecraft.item.data.ArmorTrim;
+import com.viaversion.viaversion.api.minecraft.item.data.AttributeModifiers;
+import com.viaversion.viaversion.api.minecraft.item.data.BannerPatternLayer;
+import com.viaversion.viaversion.api.minecraft.item.data.Bee;
+import com.viaversion.viaversion.api.minecraft.item.data.BlockStateProperties;
+import com.viaversion.viaversion.api.minecraft.item.data.DyedColor;
+import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
+import com.viaversion.viaversion.api.minecraft.item.data.FilterableString;
+import com.viaversion.viaversion.api.minecraft.item.data.FireworkExplosion;
+import com.viaversion.viaversion.api.minecraft.item.data.Fireworks;
+import com.viaversion.viaversion.api.minecraft.item.data.FoodProperties;
+import com.viaversion.viaversion.api.minecraft.item.data.Instrument;
+import com.viaversion.viaversion.api.minecraft.item.data.LodestoneTracker;
+import com.viaversion.viaversion.api.minecraft.item.data.PotDecorations;
+import com.viaversion.viaversion.api.minecraft.item.data.PotionContents;
+import com.viaversion.viaversion.api.minecraft.item.data.SuspiciousStewEffect;
+import com.viaversion.viaversion.api.minecraft.item.data.ToolProperties;
+import com.viaversion.viaversion.api.minecraft.item.data.Unbreakable;
+import com.viaversion.viaversion.api.minecraft.item.data.WrittenBook;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
+import com.viaversion.viaversion.util.Unit;
+
+public record StructuredDataKey<T>(String identifier, Type<T> type) {
+
+    public static final StructuredDataKey<CompoundTag> CUSTOM_DATA = new StructuredDataKey<>("custom_data", Types.COMPOUND_TAG);
+    public static final StructuredDataKey<Integer> MAX_STACK_SIZE = new StructuredDataKey<>("max_stack_size", Types.VAR_INT);
+    public static final StructuredDataKey<Integer> MAX_DAMAGE = new StructuredDataKey<>("max_damage", Types.VAR_INT);
+    public static final StructuredDataKey<Integer> DAMAGE = new StructuredDataKey<>("damage", Types.VAR_INT);
+    public static final StructuredDataKey<Unbreakable> UNBREAKABLE = new StructuredDataKey<>("unbreakable", Unbreakable.TYPE);
+    public static final StructuredDataKey<Tag> CUSTOM_NAME = new StructuredDataKey<>("custom_name", Types.TAG);
+    public static final StructuredDataKey<Tag> ITEM_NAME = new StructuredDataKey<>("item_name", Types.TAG);
+    public static final StructuredDataKey<Tag[]> LORE = new StructuredDataKey<>("lore", Types.TAG_ARRAY);
+    public static final StructuredDataKey<Integer> RARITY = new StructuredDataKey<>("rarity", Types.VAR_INT);
+    public static final StructuredDataKey<Enchantments> ENCHANTMENTS = new StructuredDataKey<>("enchantments", Enchantments.TYPE);
+    public static final StructuredDataKey<AdventureModePredicate> CAN_PLACE_ON = new StructuredDataKey<>("can_place_on", AdventureModePredicate.TYPE);
+    public static final StructuredDataKey<AdventureModePredicate> CAN_BREAK = new StructuredDataKey<>("can_break", AdventureModePredicate.TYPE);
+    public static final StructuredDataKey<AttributeModifiers> ATTRIBUTE_MODIFIERS = new StructuredDataKey<>("attribute_modifiers", AttributeModifiers.TYPE);
+    public static final StructuredDataKey<Integer> CUSTOM_MODEL_DATA = new StructuredDataKey<>("custom_model_data", Types.VAR_INT);
+    public static final StructuredDataKey<Unit> HIDE_ADDITIONAL_TOOLTIP = new StructuredDataKey<>("hide_additional_tooltip", Types.EMPTY);
+    public static final StructuredDataKey<Unit> HIDE_TOOLTIP = new StructuredDataKey<>("hide_tooltip", Types.EMPTY);
+    public static final StructuredDataKey<Integer> REPAIR_COST = new StructuredDataKey<>("repair_cost", Types.VAR_INT);
+    public static final StructuredDataKey<Unit> CREATIVE_SLOT_LOCK = new StructuredDataKey<>("creative_slot_lock", Types.EMPTY);
+    public static final StructuredDataKey<Boolean> ENCHANTMENT_GLINT_OVERRIDE = new StructuredDataKey<>("enchantment_glint_override", Types.BOOLEAN);
+    public static final StructuredDataKey<Tag> INTANGIBLE_PROJECTILE = new StructuredDataKey<>("intangible_projectile", Types.TAG); // Doesn't actually hold data
+    public static final StructuredDataKey<FoodProperties> FOOD = new StructuredDataKey<>("food", FoodProperties.TYPE);
+    public static final StructuredDataKey<Unit> FIRE_RESISTANT = new StructuredDataKey<>("fire_resistant", Types.EMPTY);
+    public static final StructuredDataKey<ToolProperties> TOOL = new StructuredDataKey<>("tool", ToolProperties.TYPE);
+    public static final StructuredDataKey<Enchantments> STORED_ENCHANTMENTS = new StructuredDataKey<>("stored_enchantments", Enchantments.TYPE);
+    public static final StructuredDataKey<DyedColor> DYED_COLOR = new StructuredDataKey<>("dyed_color", DyedColor.TYPE);
+    public static final StructuredDataKey<Integer> MAP_COLOR = new StructuredDataKey<>("map_color", Types.INT);
+    public static final StructuredDataKey<Integer> MAP_ID = new StructuredDataKey<>("map_id", Types.VAR_INT);
+    public static final StructuredDataKey<CompoundTag> MAP_DECORATIONS = new StructuredDataKey<>("map_decorations", Types.COMPOUND_TAG);
+    public static final StructuredDataKey<Integer> MAP_POST_PROCESSING = new StructuredDataKey<>("map_post_processing", Types.VAR_INT);
+    public static final StructuredDataKey<Item[]> CHARGED_PROJECTILES = new StructuredDataKey<>("charged_projectiles", Types1_20_5.ITEM_ARRAY);
+    public static final StructuredDataKey<Item[]> BUNDLE_CONTENTS = new StructuredDataKey<>("bundle_contents", Types1_20_5.ITEM_ARRAY);
+    public static final StructuredDataKey<PotionContents> POTION_CONTENTS = new StructuredDataKey<>("potion_contents", PotionContents.TYPE);
+    public static final StructuredDataKey<SuspiciousStewEffect[]> SUSPICIOUS_STEW_EFFECTS = new StructuredDataKey<>("suspicious_stew_effects", SuspiciousStewEffect.ARRAY_TYPE);
+    public static final StructuredDataKey<FilterableString[]> WRITABLE_BOOK_CONTENT = new StructuredDataKey<>("writable_book_content", FilterableString.ARRAY_TYPE);
+    public static final StructuredDataKey<WrittenBook> WRITTEN_BOOK_CONTENT = new StructuredDataKey<>("written_book_content", WrittenBook.TYPE);
+    public static final StructuredDataKey<ArmorTrim> TRIM = new StructuredDataKey<>("trim", ArmorTrim.TYPE);
+    public static final StructuredDataKey<CompoundTag> DEBUG_STICK_STATE = new StructuredDataKey<>("debug_stick_state", Types.COMPOUND_TAG);
+    public static final StructuredDataKey<CompoundTag> ENTITY_DATA = new StructuredDataKey<>("entity_data", Types.COMPOUND_TAG);
+    public static final StructuredDataKey<CompoundTag> BUCKET_ENTITY_DATA = new StructuredDataKey<>("bucket_entity_data", Types.COMPOUND_TAG);
+    public static final StructuredDataKey<CompoundTag> BLOCK_ENTITY_DATA = new StructuredDataKey<>("block_entity_data", Types.COMPOUND_TAG);
+    public static final StructuredDataKey<Holder<Instrument>> INSTRUMENT = new StructuredDataKey<>("instrument", Instrument.TYPE);
+    public static final StructuredDataKey<Integer> OMINOUS_BOTTLE_AMPLIFIER = new StructuredDataKey<>("ominous_bottle_amplifier", Types.VAR_INT);
+    public static final StructuredDataKey<Tag> RECIPES = new StructuredDataKey<>("recipes", Types.TAG);
+    public static final StructuredDataKey<LodestoneTracker> LODESTONE_TRACKER = new StructuredDataKey<>("lodestone_tracker", LodestoneTracker.TYPE);
+    public static final StructuredDataKey<FireworkExplosion> FIREWORK_EXPLOSION = new StructuredDataKey<>("firework_explosion", FireworkExplosion.TYPE);
+    public static final StructuredDataKey<Fireworks> FIREWORKS = new StructuredDataKey<>("fireworks", Fireworks.TYPE);
+    public static final StructuredDataKey<GameProfile> PROFILE = new StructuredDataKey<>("profile", Types.GAME_PROFILE);
+    public static final StructuredDataKey<String> NOTE_BLOCK_SOUND = new StructuredDataKey<>("note_block_sound", Types.STRING);
+    public static final StructuredDataKey<BannerPatternLayer[]> BANNER_PATTERNS = new StructuredDataKey<>("banner_patterns", BannerPatternLayer.ARRAY_TYPE);
+    public static final StructuredDataKey<Integer> BASE_COLOR = new StructuredDataKey<>("base_color", Types.VAR_INT);
+    public static final StructuredDataKey<PotDecorations> POT_DECORATIONS = new StructuredDataKey<>("pot_decorations", PotDecorations.TYPE);
+    public static final StructuredDataKey<Item[]> CONTAINER = new StructuredDataKey<>("container", Types1_20_5.ITEM_ARRAY);
+    public static final StructuredDataKey<BlockStateProperties> BLOCK_STATE = new StructuredDataKey<>("block_state", BlockStateProperties.TYPE);
+    public static final StructuredDataKey<Bee[]> BEES = new StructuredDataKey<>("bees", Bee.ARRAY_TYPE);
+    public static final StructuredDataKey<Tag> LOCK = new StructuredDataKey<>("lock", Types.TAG);
+    public static final StructuredDataKey<CompoundTag> CONTAINER_LOOT = new StructuredDataKey<>("container_loot", Types.COMPOUND_TAG);
+
+    @Override
+    public String toString() {
+        return "StructuredDataKey{" +
+            "identifier='" + identifier + '\'' +
+            ", type=" + type +
+            '}';
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_10.java

@@ -25,141 +25,160 @@ package com.viaversion.viaversion.api.minecraft.entities;
 import com.viaversion.viaversion.api.Via;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Optional;
 
-// 1.10 Entity / Object ids
 public class EntityTypes1_10 {
 
-    public static EntityType getTypeFromId(int typeID, boolean isObject) {
-        Optional<EntityType> type;
+    public static EntityType getTypeFromId(final int typeId, final boolean object) {
+        EntityType type;
 
-        if (isObject)
-            type = ObjectType.getPCEntity(typeID);
-        else
-            type = EntityType.findById(typeID);
-
-        if (!type.isPresent()) {
-            Via.getPlatform().getLogger().severe("Could not find 1.10 type id " + typeID + " isObject=" + isObject);
+        if (object) {
+            type = ObjectType.getEntityType(typeId);
+        } else {
+            type = EntityType.findById(typeId);
+        }
+        if (type == null) {
+            Via.getPlatform().getLogger().severe("Could not find 1.10 type id " + typeId + " objectType=" + object);
             return EntityType.ENTITY; // Fall back to the basic ENTITY
         }
-
-        return type.get();
+        return type;
     }
 
     public enum EntityType implements com.viaversion.viaversion.api.minecraft.entities.EntityType {
-        ENTITY(-1),
-        DROPPED_ITEM(1, ENTITY),
+
+        ENTITY,
+
+        AREA_EFFECT_CLOUD(3, ENTITY),
+        END_CRYSTAL(200, ENTITY),
         EXPERIENCE_ORB(2, ENTITY),
-        LEASH_HITCH(8, ENTITY), // Actually entity hanging but it doesn't make a lot of difference for metadata
-        PAINTING(9, ENTITY), // Actually entity hanging but it doesn't make a lot of difference for metadata
-        ARROW(10, ENTITY),
-        SNOWBALL(11, ENTITY), // Actually EntityProjectile
-        FIREBALL(12, ENTITY),
-        SMALL_FIREBALL(13, ENTITY),
-        ENDER_PEARL(14, ENTITY), // Actually EntityProjectile
-        ENDER_SIGNAL(15, ENTITY),
-        THROWN_EXP_BOTTLE(17, ENTITY),
-        ITEM_FRAME(18, ENTITY), // Actually EntityHanging
-        WITHER_SKULL(19, ENTITY),
-        PRIMED_TNT(20, ENTITY),
+        EYE_OF_ENDER(15, ENTITY),
         FALLING_BLOCK(21, ENTITY),
-        FIREWORK(22, ENTITY),
-        TIPPED_ARROW(23, ARROW),
-        SPECTRAL_ARROW(24, ARROW),
+        ITEM(1, ENTITY),
+        TNT(20, ENTITY),
+        LIGHTNING_BOLT(ENTITY), // Needed for entity (un)tracking
+
+        // Hanging entities
+        HANGING_ENTITY(ENTITY),
+        LEASH_KNOT(8, HANGING_ENTITY),
+        ITEM_FRAME(18, HANGING_ENTITY),
+        PAINTING(9, HANGING_ENTITY),
+
+        // Projectiles
+        PROJECTILE(ENTITY),
+        FIREWORK_ROCKET(22, ENTITY),
         SHULKER_BULLET(25, ENTITY),
-        DRAGON_FIREBALL(26, FIREBALL),
+        SNOWBALL(11, PROJECTILE),
+        ENDER_PEARL(14, PROJECTILE),
+        EGG(7, PROJECTILE),
+        EXPERIENCE_BOTTLE(17, PROJECTILE),
+        POTION(16, PROJECTILE),
+        FISHING_HOOK(ENTITY),
 
-        ENTITY_LIVING(-1, ENTITY),
-        ENTITY_INSENTIENT(-1, ENTITY_LIVING),
-        ENTITY_AGEABLE(-1, ENTITY_INSENTIENT),
-        ENTITY_TAMEABLE_ANIMAL(-1, ENTITY_AGEABLE),
-        ENTITY_HUMAN(-1, ENTITY_LIVING),
+        ABSTRACT_ARROW(ENTITY),
+        ARROW(10, ABSTRACT_ARROW),
+        SPECTRAL_ARROW(24, ABSTRACT_ARROW),
 
-        ARMOR_STAND(30, ENTITY_LIVING),
+        HURTING_PROJECTILE(ENTITY),
+        DRAGON_FIREBALL(26, HURTING_PROJECTILE),
+        FIREBALL(12, HURTING_PROJECTILE),
+        SMALL_FIREBALL(13, HURTING_PROJECTILE),
+        WITHER_SKULL(19, HURTING_PROJECTILE),
 
         // Vehicles
-        MINECART_ABSTRACT(-1, ENTITY),
-        MINECART_COMMAND(40, MINECART_ABSTRACT),
         BOAT(41, ENTITY),
-        MINECART_RIDEABLE(42, MINECART_ABSTRACT),
-        MINECART_CHEST(43, MINECART_ABSTRACT),
-        MINECART_FURNACE(44, MINECART_ABSTRACT),
-        MINECART_TNT(45, MINECART_ABSTRACT),
-        MINECART_HOPPER(46, MINECART_ABSTRACT),
-        MINECART_MOB_SPAWNER(47, MINECART_ABSTRACT),
 
-        CREEPER(50, ENTITY_INSENTIENT),
-        SKELETON(51, ENTITY_INSENTIENT),
-        SPIDER(52, ENTITY_INSENTIENT),
-        GIANT(53, ENTITY_INSENTIENT),
-        ZOMBIE(54, ENTITY_INSENTIENT),
-        SLIME(55, ENTITY_INSENTIENT),
-        GHAST(56, ENTITY_INSENTIENT),
-        PIG_ZOMBIE(57, ZOMBIE),
-        ENDERMAN(58, ENTITY_INSENTIENT),
-        CAVE_SPIDER(59, SPIDER),
-        SILVERFISH(60, ENTITY_INSENTIENT),
-        BLAZE(61, ENTITY_INSENTIENT),
+        ABSTRACT_MINECART(ENTITY),
+        MINECART(42, ABSTRACT_MINECART),
+        FURNACE_MINECART(44, ABSTRACT_MINECART),
+        COMMAND_BLOCK_MINECART(40, ABSTRACT_MINECART),
+        TNT_MINECART(45, ABSTRACT_MINECART),
+        SPAWNER_MINECART(47, ABSTRACT_MINECART),
+
+        ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART),
+        CHEST_MINECART(43, ABSTRACT_MINECART_CONTAINER),
+        HOPPER_MINECART(46, ABSTRACT_MINECART_CONTAINER),
+
+        LIVING_ENTITY_BASE(ENTITY),
+        ARMOR_STAND(30, LIVING_ENTITY_BASE),
+        PLAYER(LIVING_ENTITY_BASE), // Needed for entity (un)tracking
+
+        // Living entities as a larger subclass
+        LIVING_ENTITY(48, LIVING_ENTITY_BASE),
+        ENDER_DRAGON(63, LIVING_ENTITY),
+        ABSTRACT_CREATURE(LIVING_ENTITY),
+        SLIME(55, LIVING_ENTITY),
         MAGMA_CUBE(62, SLIME),
-        ENDER_DRAGON(63, ENTITY_INSENTIENT),
-        WITHER(64, ENTITY_INSENTIENT),
-        BAT(65, ENTITY_INSENTIENT),
-        WITCH(66, ENTITY_INSENTIENT),
-        ENDERMITE(67, ENTITY_INSENTIENT),
-        GUARDIAN(68, ENTITY_INSENTIENT),
-        IRON_GOLEM(99, ENTITY_INSENTIENT), // moved up to avoid illegal forward references
-        SHULKER(69, IRON_GOLEM),
-        PIG(90, ENTITY_AGEABLE),
-        SHEEP(91, ENTITY_AGEABLE),
-        COW(92, ENTITY_AGEABLE),
-        CHICKEN(93, ENTITY_AGEABLE),
-        SQUID(94, ENTITY_INSENTIENT),
-        WOLF(95, ENTITY_TAMEABLE_ANIMAL),
-        MUSHROOM_COW(96, COW),
-        SNOWMAN(97, IRON_GOLEM),
-        OCELOT(98, ENTITY_TAMEABLE_ANIMAL),
-        HORSE(100, ENTITY_AGEABLE),
-        RABBIT(101, ENTITY_AGEABLE),
-        POLAR_BEAR(102, ENTITY_AGEABLE),
-        VILLAGER(120, ENTITY_AGEABLE),
-        ENDER_CRYSTAL(200, ENTITY),
-        SPLASH_POTION(-1, ENTITY),
-        LINGERING_POTION(-1, SPLASH_POTION),
-        AREA_EFFECT_CLOUD(-1, ENTITY),
-        EGG(-1, ENTITY),
-        FISHING_HOOK(-1, ENTITY),
-        LIGHTNING(-1, ENTITY),
-        WEATHER(-1, ENTITY),
-        PLAYER(-1, ENTITY_HUMAN),
-        COMPLEX_PART(-1, ENTITY);
+
+        // Flying entities
+        FLYING_MOB(LIVING_ENTITY),
+        GHAST(56, FLYING_MOB),
+
+        AMBIENT_CREATURE(LIVING_ENTITY),
+        BAT(65, AMBIENT_CREATURE),
+
+        ABSTRACT_GOLEM(ABSTRACT_CREATURE),
+        SNOW_GOLEM(97, ABSTRACT_GOLEM),
+        IRON_GOLEM(99, ABSTRACT_GOLEM),
+        SHULKER(69, ABSTRACT_GOLEM),
+
+        WATER_ANIMAL(LIVING_ENTITY),
+        SQUID(94, WATER_ANIMAL),
+
+        // Ageable mobs and (tamable) animals
+        ABSTRACT_AGEABLE(ABSTRACT_CREATURE),
+        VILLAGER(120, ABSTRACT_AGEABLE),
+
+        ABSTRACT_ANIMAL(ABSTRACT_AGEABLE),
+        CHICKEN(93, ABSTRACT_ANIMAL),
+        COW(92, ABSTRACT_ANIMAL),
+        MOOSHROOM(96, COW),
+        PIG(90, ABSTRACT_ANIMAL),
+        POLAR_BEAR(102, ABSTRACT_ANIMAL),
+        RABBIT(101, ABSTRACT_ANIMAL),
+        SHEEP(91, ABSTRACT_ANIMAL),
+        HORSE(100, ABSTRACT_ANIMAL),
+
+        TAMABLE_ANIMAL(ABSTRACT_ANIMAL),
+        OCELOT(98, TAMABLE_ANIMAL),
+        WOLF(95, TAMABLE_ANIMAL),
+
+        // Monsters
+        ABSTRACT_MONSTER(49, ABSTRACT_CREATURE),
+        BLAZE(61, ABSTRACT_MONSTER),
+        CREEPER(50, ABSTRACT_MONSTER),
+        ENDERMITE(67, ABSTRACT_MONSTER),
+        ENDERMAN(58, ABSTRACT_MONSTER),
+        GIANT(53, ABSTRACT_MONSTER),
+        SILVERFISH(60, ABSTRACT_MONSTER),
+        WITCH(66, ABSTRACT_MONSTER),
+        WITHER(64, ABSTRACT_MONSTER),
+        SKELETON(51, ABSTRACT_MONSTER),
+        ZOMBIE(54, ABSTRACT_MONSTER),
+        ZOMBIE_PIGMEN(57, ZOMBIE),
+
+        GUARDIAN(68, ABSTRACT_MONSTER),
+        SPIDER(52, ABSTRACT_MONSTER),
+        CAVE_SPIDER(59, SPIDER);
 
         private static final Map<Integer, EntityType> TYPES = new HashMap<>();
 
         private final int id;
         private final EntityType parent;
 
-        EntityType(int id) {
-            this.id = id;
+        EntityType() {
+            this.id = -1;
             this.parent = null;
         }
 
+        EntityType(EntityType parent) {
+            this.id = -1;
+            this.parent = parent;
+        }
+
         EntityType(int id, EntityType parent) {
             this.id = id;
             this.parent = parent;
         }
 
-        static {
-            for (EntityType type : EntityType.values()) {
-                TYPES.put(type.id, type);
-            }
-        }
-
-        public static Optional<EntityType> findById(int id) {
-            if (id == -1)  // Check if this is called
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
-        }
-
         @Override
         public int getId() {
             return id;
@@ -179,16 +198,29 @@ public class EntityTypes1_10 {
         public boolean isAbstractType() {
             return id != -1;
         }
+
+        static {
+            for (EntityType type : EntityType.values()) {
+                TYPES.put(type.id, type);
+            }
+        }
+
+        public static EntityType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
+        }
     }
 
     public enum ObjectType implements com.viaversion.viaversion.api.minecraft.entities.ObjectType {
         BOAT(1, EntityType.BOAT),
-        ITEM(2, EntityType.DROPPED_ITEM),
+        ITEM(2, EntityType.ITEM),
         AREA_EFFECT_CLOUD(3, EntityType.AREA_EFFECT_CLOUD),
-        MINECART(10, EntityType.MINECART_RIDEABLE),
-        TNT_PRIMED(50, EntityType.PRIMED_TNT),
-        ENDER_CRYSTAL(51, EntityType.ENDER_CRYSTAL),
-        TIPPED_ARROW(60, EntityType.TIPPED_ARROW),
+        MINECART(10, EntityType.MINECART), // There are multiple types, but we don't need them
+        TNT_PRIMED(50, EntityType.TNT),
+        ENDER_CRYSTAL(51, EntityType.END_CRYSTAL),
+        TIPPED_ARROW(60, EntityType.ARROW),
         SNOWBALL(61, EntityType.SNOWBALL),
         EGG(62, EntityType.EGG),
         FIREBALL(63, EntityType.FIREBALL),
@@ -198,11 +230,11 @@ public class EntityTypes1_10 {
         SHULKER_BULLET(67, EntityType.SHULKER_BULLET),
         FALLING_BLOCK(70, EntityType.FALLING_BLOCK),
         ITEM_FRAME(71, EntityType.ITEM_FRAME),
-        ENDER_SIGNAL(72, EntityType.ENDER_SIGNAL),
-        POTION(73, EntityType.SPLASH_POTION),
-        THROWN_EXP_BOTTLE(75, EntityType.THROWN_EXP_BOTTLE),
-        FIREWORK(76, EntityType.FIREWORK),
-        LEASH(77, EntityType.LEASH_HITCH),
+        EYE_OF_ENDER(72, EntityType.EYE_OF_ENDER),
+        POTION(73, EntityType.POTION),
+        EXPERIENCE_BOTTLE(75, EntityType.EXPERIENCE_BOTTLE),
+        FIREWORK_ROCKET(76, EntityType.FIREWORK_ROCKET),
+        LEASH(77, EntityType.LEASH_KNOT),
         ARMOR_STAND(78, EntityType.ARMOR_STAND),
         FISHIHNG_HOOK(90, EntityType.FISHING_HOOK),
         SPECTRAL_ARROW(91, EntityType.SPECTRAL_ARROW),
@@ -234,18 +266,16 @@ public class EntityTypes1_10 {
             return type;
         }
 
-        public static Optional<ObjectType> findById(int id) {
-            if (id == -1)
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static ObjectType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
 
-        public static Optional<EntityType> getPCEntity(int id) {
-            Optional<ObjectType> output = findById(id);
-
-            if (!output.isPresent())
-                return Optional.empty();
-            return Optional.of(output.get().type);
+        public static EntityType getEntityType(final int id) {
+            final ObjectType objectType = findById(id);
+            return objectType != null ? objectType.type : null;
         }
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_11.java

@@ -25,152 +25,180 @@ package com.viaversion.viaversion.api.minecraft.entities;
 import com.viaversion.viaversion.api.Via;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Optional;
 
-// 1.11 Entity / Object ids
 public class EntityTypes1_11 {
 
-    public static EntityType getTypeFromId(int typeID, boolean isObject) {
-        Optional<EntityType> type;
+    public static EntityType getTypeFromId(final int typeId, final boolean object) {
+        EntityType type;
 
-        if (isObject)
-            type = ObjectType.getPCEntity(typeID);
-        else
-            type = EntityType.findById(typeID);
-
-        if (!type.isPresent()) {
-            Via.getPlatform().getLogger().severe("Could not find 1.11 type id " + typeID + " isObject=" + isObject);
+        if (object) {
+            type = ObjectType.getEntityType(typeId);
+        } else {
+            type = EntityType.findById(typeId);
+        }
+        if (type == null) {
+            Via.getPlatform().getLogger().severe("Could not find 1.11 type id " + typeId + " objectType=" + object);
             return EntityType.ENTITY; // Fall back to the basic ENTITY
         }
-
-        return type.get();
+        return type;
     }
 
     public enum EntityType implements com.viaversion.viaversion.api.minecraft.entities.EntityType {
-        ENTITY(-1),
-        DROPPED_ITEM(1, ENTITY),
+
+        ENTITY,
+
+        AREA_EFFECT_CLOUD(3, ENTITY),
+        END_CRYSTAL(200, ENTITY),
+        EVOKER_FANGS(33, ENTITY),
         EXPERIENCE_ORB(2, ENTITY),
-        LEASH_HITCH(8, ENTITY), // Actually entity hanging but it doesn't make a lot of difference for metadata
-        PAINTING(9, ENTITY), // Actually entity hanging but it doesn't make a lot of difference for metadata
-        ARROW(10, ENTITY),
-        SNOWBALL(11, ENTITY), // Actually EntityProjectile
-        FIREBALL(12, ENTITY),
-        SMALL_FIREBALL(13, ENTITY),
-        ENDER_PEARL(14, ENTITY), // Actually EntityProjectile
-        ENDER_SIGNAL(15, ENTITY),
-        THROWN_EXP_BOTTLE(17, ENTITY),
-        ITEM_FRAME(18, ENTITY), // Actually EntityHanging
-        WITHER_SKULL(19, ENTITY),
-        PRIMED_TNT(20, ENTITY),
+        EYE_OF_ENDER(15, ENTITY),
         FALLING_BLOCK(21, ENTITY),
-        FIREWORK(22, ENTITY),
-        SPECTRAL_ARROW(24, ARROW),
+        ITEM(1, ENTITY),
+        TNT(20, ENTITY),
+        LIGHTNING_BOLT(ENTITY), // Needed for entity (un)tracking
+
+        // Hanging entities
+        HANGING_ENTITY(ENTITY),
+        LEASH_KNOT(8, HANGING_ENTITY),
+        ITEM_FRAME(18, HANGING_ENTITY),
+        PAINTING(9, HANGING_ENTITY),
+
+        // Projectiles
+        PROJECTILE(ENTITY),
+        FIREWORK_ROCKET(22, ENTITY),
+        LLAMA_SPIT(104, ENTITY),
         SHULKER_BULLET(25, ENTITY),
-        DRAGON_FIREBALL(26, FIREBALL),
-        EVOCATION_FANGS(33, ENTITY),
+        SNOWBALL(11, PROJECTILE),
+        ENDER_PEARL(14, PROJECTILE),
+        EGG(7, PROJECTILE),
+        EXPERIENCE_BOTTLE(17, PROJECTILE),
+        POTION(16, PROJECTILE),
+        FISHING_HOOK(ENTITY),
 
+        ABSTRACT_ARROW(ENTITY),
+        ARROW(10, ABSTRACT_ARROW),
+        SPECTRAL_ARROW(24, ABSTRACT_ARROW),
 
-        ENTITY_LIVING(-1, ENTITY),
-        ENTITY_INSENTIENT(-1, ENTITY_LIVING),
-        ENTITY_AGEABLE(-1, ENTITY_INSENTIENT),
-        ENTITY_TAMEABLE_ANIMAL(-1, ENTITY_AGEABLE),
-        ENTITY_HUMAN(-1, ENTITY_LIVING),
-
-        ARMOR_STAND(30, ENTITY_LIVING),
-        EVOCATION_ILLAGER(34, ENTITY_INSENTIENT),
-        VEX(35, ENTITY_INSENTIENT),
-        VINDICATION_ILLAGER(36, ENTITY_INSENTIENT),
+        HURTING_PROJECTILE(ENTITY),
+        DRAGON_FIREBALL(26, HURTING_PROJECTILE),
+        FIREBALL(12, HURTING_PROJECTILE),
+        SMALL_FIREBALL(13, HURTING_PROJECTILE),
+        WITHER_SKULL(19, HURTING_PROJECTILE),
 
         // Vehicles
-        MINECART_ABSTRACT(-1, ENTITY),
-        MINECART_COMMAND(40, MINECART_ABSTRACT),
         BOAT(41, ENTITY),
-        MINECART_RIDEABLE(42, MINECART_ABSTRACT),
-        MINECART_CHEST(43, MINECART_ABSTRACT),
-        MINECART_FURNACE(44, MINECART_ABSTRACT),
-        MINECART_TNT(45, MINECART_ABSTRACT),
-        MINECART_HOPPER(46, MINECART_ABSTRACT),
-        MINECART_MOB_SPAWNER(47, MINECART_ABSTRACT),
 
-        CREEPER(50, ENTITY_INSENTIENT),
+        ABSTRACT_MINECART(ENTITY),
+        MINECART(42, ABSTRACT_MINECART),
+        FURNACE_MINECART(44, ABSTRACT_MINECART),
+        COMMAND_BLOCK_MINECART(40, ABSTRACT_MINECART),
+        TNT_MINECART(45, ABSTRACT_MINECART),
+        SPAWNER_MINECART(47, ABSTRACT_MINECART),
 
-        ABSTRACT_SKELETON(-1, ENTITY_INSENTIENT),
-        SKELETON(51, ABSTRACT_SKELETON),
-        WITHER_SKELETON(5, ABSTRACT_SKELETON),
-        STRAY(6, ABSTRACT_SKELETON),
+        ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART),
+        CHEST_MINECART(43, ABSTRACT_MINECART_CONTAINER),
+        HOPPER_MINECART(46, ABSTRACT_MINECART_CONTAINER),
 
-        SPIDER(52, ENTITY_INSENTIENT),
-        GIANT(53, ENTITY_INSENTIENT),
+        LIVING_ENTITY_BASE(ENTITY),
+        ARMOR_STAND(30, LIVING_ENTITY_BASE),
+        PLAYER(LIVING_ENTITY_BASE), // Needed for entity (un)tracking
 
-        ZOMBIE(54, ENTITY_INSENTIENT),
-        HUSK(23, ZOMBIE),
-        ZOMBIE_VILLAGER(27, ZOMBIE),
-
-        SLIME(55, ENTITY_INSENTIENT),
-        GHAST(56, ENTITY_INSENTIENT),
-        PIG_ZOMBIE(57, ZOMBIE),
-        ENDERMAN(58, ENTITY_INSENTIENT),
-        CAVE_SPIDER(59, SPIDER),
-        SILVERFISH(60, ENTITY_INSENTIENT),
-        BLAZE(61, ENTITY_INSENTIENT),
+        // Living entities as a larger subclass
+        LIVING_ENTITY(LIVING_ENTITY_BASE),
+        ENDER_DRAGON(63, LIVING_ENTITY),
+        ABSTRACT_CREATURE(LIVING_ENTITY),
+        SLIME(55, LIVING_ENTITY),
         MAGMA_CUBE(62, SLIME),
-        ENDER_DRAGON(63, ENTITY_INSENTIENT),
-        WITHER(64, ENTITY_INSENTIENT),
-        BAT(65, ENTITY_INSENTIENT),
-        WITCH(66, ENTITY_INSENTIENT),
-        ENDERMITE(67, ENTITY_INSENTIENT),
 
-        GUARDIAN(68, ENTITY_INSENTIENT),
-        ELDER_GUARDIAN(4, GUARDIAN), // Moved down to avoid illegal forward reference
+        // Flying entities
+        FLYING_MOB(LIVING_ENTITY),
+        GHAST(56, FLYING_MOB),
 
-        IRON_GOLEM(99, ENTITY_INSENTIENT), // moved up to avoid illegal forward references
-        SHULKER(69, IRON_GOLEM),
-        PIG(90, ENTITY_AGEABLE),
-        SHEEP(91, ENTITY_AGEABLE),
-        COW(92, ENTITY_AGEABLE),
-        CHICKEN(93, ENTITY_AGEABLE),
-        SQUID(94, ENTITY_INSENTIENT),
-        WOLF(95, ENTITY_TAMEABLE_ANIMAL),
-        MUSHROOM_COW(96, COW),
-        SNOWMAN(97, IRON_GOLEM),
-        OCELOT(98, ENTITY_TAMEABLE_ANIMAL),
+        AMBIENT_CREATURE(LIVING_ENTITY),
+        BAT(65, AMBIENT_CREATURE),
 
-        ABSTRACT_HORSE(-1, ENTITY_AGEABLE),
+        ABSTRACT_GOLEM(ABSTRACT_CREATURE),
+        SNOW_GOLEM(97, ABSTRACT_GOLEM),
+        IRON_GOLEM(99, ABSTRACT_GOLEM),
+        SHULKER(69, ABSTRACT_GOLEM),
+
+        WATER_ANIMAL(ABSTRACT_CREATURE),
+        SQUID(94, WATER_ANIMAL),
+
+        // Ageable mobs and (tamable) animals
+        ABSTRACT_AGEABLE(ABSTRACT_CREATURE),
+        VILLAGER(120, ABSTRACT_AGEABLE),
+
+        ABSTRACT_ANIMAL(ABSTRACT_AGEABLE),
+        CHICKEN(93, ABSTRACT_ANIMAL),
+        COW(92, ABSTRACT_ANIMAL),
+        MOOSHROOM(96, COW),
+        PIG(90, ABSTRACT_ANIMAL),
+        POLAR_BEAR(102, ABSTRACT_ANIMAL),
+        RABBIT(101, ABSTRACT_ANIMAL),
+        SHEEP(91, ABSTRACT_ANIMAL),
+
+        TAMABLE_ANIMAL(ABSTRACT_ANIMAL),
+        OCELOT(98, TAMABLE_ANIMAL),
+        WOLF(95, TAMABLE_ANIMAL),
+
+        // Horses
+        ABSTRACT_HORSE(ABSTRACT_ANIMAL),
         HORSE(100, ABSTRACT_HORSE),
         SKELETON_HORSE(28, ABSTRACT_HORSE),
         ZOMBIE_HORSE(29, ABSTRACT_HORSE),
 
-        CHESTED_HORSE(-1, ABSTRACT_HORSE),
+        CHESTED_HORSE(ABSTRACT_HORSE),
         DONKEY(31, CHESTED_HORSE),
         MULE(32, CHESTED_HORSE),
-        LIAMA(103, CHESTED_HORSE),
+        LLAMA(103, CHESTED_HORSE),
 
+        // Monsters
+        ABSTRACT_MONSTER(ABSTRACT_CREATURE),
+        BLAZE(61, ABSTRACT_MONSTER),
+        CREEPER(50, ABSTRACT_MONSTER),
+        ENDERMITE(67, ABSTRACT_MONSTER),
+        ENDERMAN(58, ABSTRACT_MONSTER),
+        GIANT(53, ABSTRACT_MONSTER),
+        SILVERFISH(60, ABSTRACT_MONSTER),
+        VEX(35, ABSTRACT_MONSTER),
+        WITCH(66, ABSTRACT_MONSTER),
+        WITHER(64, ABSTRACT_MONSTER),
 
-        RABBIT(101, ENTITY_AGEABLE),
-        POLAR_BEAR(102, ENTITY_AGEABLE),
-        VILLAGER(120, ENTITY_AGEABLE),
-        ENDER_CRYSTAL(200, ENTITY),
-        SPLASH_POTION(-1, ENTITY),
-        LINGERING_POTION(-1, SPLASH_POTION),
-        AREA_EFFECT_CLOUD(-1, ENTITY),
-        EGG(-1, ENTITY),
-        FISHING_HOOK(-1, ENTITY),
-        LIGHTNING(-1, ENTITY),
-        WEATHER(-1, ENTITY),
-        PLAYER(-1, ENTITY_HUMAN),
-        COMPLEX_PART(-1, ENTITY),
-        LIAMA_SPIT(-1, ENTITY);
+        ABSTRACT_SKELETON(ABSTRACT_MONSTER),
+        SKELETON(51, ABSTRACT_SKELETON),
+        STRAY(6, ABSTRACT_SKELETON),
+        WITHER_SKELETON(5, ABSTRACT_SKELETON),
+
+        ZOMBIE(54, ABSTRACT_MONSTER),
+        HUSK(23, ZOMBIE),
+        ZOMBIE_PIGMEN(57, ZOMBIE),
+        ZOMBIE_VILLAGER(27, ZOMBIE),
+
+        GUARDIAN(68, ABSTRACT_MONSTER),
+        ELDER_GUARDIAN(4, GUARDIAN),
+        SPIDER(52, ABSTRACT_MONSTER),
+        CAVE_SPIDER(59, ABSTRACT_MONSTER),
+
+        // Illagers
+        EVOKER(34, ABSTRACT_MONSTER),
+        VINDICATOR(36, ABSTRACT_MONSTER);
 
         private static final Map<Integer, EntityType> TYPES = new HashMap<>();
 
         private final int id;
         private final EntityType parent;
 
-        EntityType(int id) {
-            this.id = id;
+        EntityType() {
+            this.id = -1;
             this.parent = null;
         }
 
+        EntityType(EntityType parent) {
+            this.id = -1;
+            this.parent = parent;
+        }
+
         EntityType(int id, EntityType parent) {
             this.id = id;
             this.parent = parent;
@@ -202,20 +230,21 @@ public class EntityTypes1_11 {
             }
         }
 
-        public static Optional<EntityType> findById(int id) {
-            if (id == -1)  // Check if this is called
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static EntityType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
     }
 
     public enum ObjectType implements com.viaversion.viaversion.api.minecraft.entities.ObjectType {
         BOAT(1, EntityType.BOAT),
-        ITEM(2, EntityType.DROPPED_ITEM),
+        ITEM(2, EntityType.ITEM),
         AREA_EFFECT_CLOUD(3, EntityType.AREA_EFFECT_CLOUD),
-        MINECART(10, EntityType.MINECART_RIDEABLE),
-        TNT_PRIMED(50, EntityType.PRIMED_TNT),
-        ENDER_CRYSTAL(51, EntityType.ENDER_CRYSTAL),
+        MINECART(10, EntityType.MINECART), // There are multiple types, but we don't need them
+        TNT_PRIMED(50, EntityType.TNT),
+        ENDER_CRYSTAL(51, EntityType.END_CRYSTAL),
         TIPPED_ARROW(60, EntityType.ARROW),
         SNOWBALL(61, EntityType.SNOWBALL),
         EGG(62, EntityType.EGG),
@@ -224,16 +253,16 @@ public class EntityTypes1_11 {
         ENDER_PEARL(65, EntityType.ENDER_PEARL),
         WITHER_SKULL(66, EntityType.WITHER_SKULL),
         SHULKER_BULLET(67, EntityType.SHULKER_BULLET),
-        LIAMA_SPIT(68, EntityType.LIAMA_SPIT),
+        LLAMA_SPIT(68, EntityType.LLAMA_SPIT),
         FALLING_BLOCK(70, EntityType.FALLING_BLOCK),
         ITEM_FRAME(71, EntityType.ITEM_FRAME),
-        ENDER_SIGNAL(72, EntityType.ENDER_SIGNAL),
-        POTION(73, EntityType.SPLASH_POTION),
-        THROWN_EXP_BOTTLE(75, EntityType.THROWN_EXP_BOTTLE),
-        FIREWORK(76, EntityType.FIREWORK),
-        LEASH(77, EntityType.LEASH_HITCH),
+        EYE_OF_ENDER(72, EntityType.EYE_OF_ENDER),
+        POTION(73, EntityType.POTION),
+        EXPERIENCE_BOTTLE(75, EntityType.EXPERIENCE_BOTTLE),
+        FIREWORK_ROCKET(76, EntityType.FIREWORK_ROCKET),
+        LEASH(77, EntityType.LEASH_KNOT),
         ARMOR_STAND(78, EntityType.ARMOR_STAND),
-        EVOCATION_FANGS(79, EntityType.EVOCATION_FANGS),
+        EVOKER_FANGS(79, EntityType.EVOKER_FANGS),
         FISHIHNG_HOOK(90, EntityType.FISHING_HOOK),
         SPECTRAL_ARROW(91, EntityType.SPECTRAL_ARROW),
         DRAGON_FIREBALL(93, EntityType.DRAGON_FIREBALL);
@@ -264,18 +293,16 @@ public class EntityTypes1_11 {
             return type;
         }
 
-        public static Optional<ObjectType> findById(int id) {
-            if (id == -1)
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static ObjectType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
 
-        public static Optional<EntityType> getPCEntity(int id) {
-            Optional<ObjectType> output = findById(id);
-
-            if (!output.isPresent())
-                return Optional.empty();
-            return Optional.of(output.get().type);
+        public static EntityType getEntityType(final int id) {
+            final ObjectType objectType = findById(id);
+            return objectType != null ? objectType.type : null;
         }
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_12.java

@@ -20,161 +20,191 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-
 package com.viaversion.viaversion.api.minecraft.entities;
 
 import com.viaversion.viaversion.api.Via;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Optional;
 
-// 1.12 Entity / Object taken from https://github.com/Matsv/ViaBackwards/blob/master/core/src/main/java/nl/matsv/viabackwards/api/entities/types/EntityType1_12.java
 public class EntityTypes1_12 {
 
-    public static EntityType getTypeFromId(int typeID, boolean isObject) {
-        Optional<EntityType> type;
+    public static EntityType getTypeFromId(final int typeId, final boolean object) {
+        EntityType type;
 
-        if (isObject)
-            type = ObjectType.getPCEntity(typeID);
-        else
-            type = EntityType.findById(typeID);
-
-        if (!type.isPresent()) {
-            Via.getPlatform().getLogger().severe("Could not find 1.12 type id " + typeID + " isObject=" + isObject);
+        if (object) {
+            type = ObjectType.getEntityType(typeId);
+        } else {
+            type = EntityType.findById(typeId);
+        }
+        if (type == null) {
+            Via.getPlatform().getLogger().severe("Could not find 1.12 type id " + typeId + " objectType=" + object);
             return EntityType.ENTITY; // Fall back to the basic ENTITY
         }
-
-        return type.get();
+        return type;
     }
 
     public enum EntityType implements com.viaversion.viaversion.api.minecraft.entities.EntityType {
-        ENTITY(-1),
-        DROPPED_ITEM(1, ENTITY),
+
+        ENTITY,
+
+        AREA_EFFECT_CLOUD(3, ENTITY),
+        END_CRYSTAL(200, ENTITY),
+        EVOKER_FANGS(33, ENTITY),
         EXPERIENCE_ORB(2, ENTITY),
-        LEASH_HITCH(8, ENTITY), // Actually entity hanging but it doesn't make a lot of difference for metadata
-        PAINTING(9, ENTITY), // Actually entity hanging but it doesn't make a lot of difference for metadata
-        ARROW(10, ENTITY),
-        SNOWBALL(11, ENTITY), // Actually EntityProjectile
-        FIREBALL(12, ENTITY),
-        SMALL_FIREBALL(13, ENTITY),
-        ENDER_PEARL(14, ENTITY), // Actually EntityProjectile
-        ENDER_SIGNAL(15, ENTITY),
-        THROWN_EXP_BOTTLE(17, ENTITY),
-        ITEM_FRAME(18, ENTITY), // Actually EntityHanging
-        WITHER_SKULL(19, ENTITY),
-        PRIMED_TNT(20, ENTITY),
+        EYE_OF_ENDER(15, ENTITY),
         FALLING_BLOCK(21, ENTITY),
-        FIREWORK(22, ENTITY),
-        SPECTRAL_ARROW(24, ARROW),
+        ITEM(1, ENTITY),
+        TNT(20, ENTITY),
+        LIGHTNING_BOLT(ENTITY), // Needed for entity (un)tracking
+
+        // Hanging entities
+        HANGING_ENTITY(ENTITY),
+        LEASH_KNOT(8, HANGING_ENTITY),
+        ITEM_FRAME(18, HANGING_ENTITY),
+        PAINTING(9, HANGING_ENTITY),
+
+        // Projectiles
+        PROJECTILE(ENTITY),
+        FIREWORK_ROCKET(22, ENTITY),
+        LLAMA_SPIT(104, ENTITY),
         SHULKER_BULLET(25, ENTITY),
-        DRAGON_FIREBALL(26, FIREBALL),
-        EVOCATION_FANGS(33, ENTITY),
+        SNOWBALL(11, PROJECTILE),
+        ENDER_PEARL(14, PROJECTILE),
+        EGG(7, PROJECTILE),
+        EXPERIENCE_BOTTLE(17, PROJECTILE),
+        POTION(16, PROJECTILE),
+        FISHING_HOOK(ENTITY),
 
+        ABSTRACT_ARROW(ENTITY),
+        ARROW(10, ABSTRACT_ARROW),
+        SPECTRAL_ARROW(24, ABSTRACT_ARROW),
 
-        ENTITY_LIVING(-1, ENTITY),
-        ENTITY_INSENTIENT(-1, ENTITY_LIVING),
-        ENTITY_AGEABLE(-1, ENTITY_INSENTIENT),
-        ENTITY_TAMEABLE_ANIMAL(-1, ENTITY_AGEABLE),
-        ENTITY_HUMAN(-1, ENTITY_LIVING),
-
-        ARMOR_STAND(30, ENTITY_LIVING),
-        ENTITY_ILLAGER_ABSTRACT(-1, ENTITY_INSENTIENT),
-        EVOCATION_ILLAGER(34, ENTITY_ILLAGER_ABSTRACT),
-        VEX(35, ENTITY_INSENTIENT),
-        VINDICATION_ILLAGER(36, ENTITY_ILLAGER_ABSTRACT),
-        ILLUSION_ILLAGER(37, EVOCATION_ILLAGER),
+        HURTING_PROJECTILE(ENTITY),
+        DRAGON_FIREBALL(26, HURTING_PROJECTILE),
+        FIREBALL(12, HURTING_PROJECTILE),
+        SMALL_FIREBALL(13, HURTING_PROJECTILE),
+        WITHER_SKULL(19, HURTING_PROJECTILE),
 
         // Vehicles
-        MINECART_ABSTRACT(-1, ENTITY),
-        MINECART_COMMAND(40, MINECART_ABSTRACT),
         BOAT(41, ENTITY),
-        MINECART_RIDEABLE(42, MINECART_ABSTRACT),
-        MINECART_CHEST(43, MINECART_ABSTRACT),
-        MINECART_FURNACE(44, MINECART_ABSTRACT),
-        MINECART_TNT(45, MINECART_ABSTRACT),
-        MINECART_HOPPER(46, MINECART_ABSTRACT),
-        MINECART_MOB_SPAWNER(47, MINECART_ABSTRACT),
 
-        CREEPER(50, ENTITY_INSENTIENT),
+        ABSTRACT_MINECART(ENTITY),
+        MINECART(42, ABSTRACT_MINECART),
+        FURNACE_MINECART(44, ABSTRACT_MINECART),
+        COMMAND_BLOCK_MINECART(40, ABSTRACT_MINECART),
+        TNT_MINECART(45, ABSTRACT_MINECART),
+        SPAWNER_MINECART(47, ABSTRACT_MINECART),
 
-        ABSTRACT_SKELETON(-1, ENTITY_INSENTIENT),
-        SKELETON(51, ABSTRACT_SKELETON),
-        WITHER_SKELETON(5, ABSTRACT_SKELETON),
-        STRAY(6, ABSTRACT_SKELETON),
+        ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART),
+        CHEST_MINECART(43, ABSTRACT_MINECART_CONTAINER),
+        HOPPER_MINECART(46, ABSTRACT_MINECART_CONTAINER),
 
-        SPIDER(52, ENTITY_INSENTIENT),
-        GIANT(53, ENTITY_INSENTIENT),
+        LIVING_ENTITY_BASE(ENTITY),
+        ARMOR_STAND(30, LIVING_ENTITY_BASE),
+        PLAYER(ENTITY), // Needed for entity (un)tracking
 
-        ZOMBIE(54, ENTITY_INSENTIENT),
-        HUSK(23, ZOMBIE),
-        ZOMBIE_VILLAGER(27, ZOMBIE),
-
-        SLIME(55, ENTITY_INSENTIENT),
-        GHAST(56, ENTITY_INSENTIENT),
-        PIG_ZOMBIE(57, ZOMBIE),
-        ENDERMAN(58, ENTITY_INSENTIENT),
-        CAVE_SPIDER(59, SPIDER),
-        SILVERFISH(60, ENTITY_INSENTIENT),
-        BLAZE(61, ENTITY_INSENTIENT),
+        // Living entities as a larger subclass
+        LIVING_ENTITY(LIVING_ENTITY_BASE),
+        ENDER_DRAGON(63, LIVING_ENTITY),
+        ABSTRACT_CREATURE(LIVING_ENTITY),
+        SLIME(55, LIVING_ENTITY),
         MAGMA_CUBE(62, SLIME),
-        ENDER_DRAGON(63, ENTITY_INSENTIENT),
-        WITHER(64, ENTITY_INSENTIENT),
-        BAT(65, ENTITY_INSENTIENT),
-        WITCH(66, ENTITY_INSENTIENT),
-        ENDERMITE(67, ENTITY_INSENTIENT),
 
-        GUARDIAN(68, ENTITY_INSENTIENT),
-        ELDER_GUARDIAN(4, GUARDIAN), // Moved down to avoid illegal forward reference
+        // Flying entities
+        FLYING_MOB(LIVING_ENTITY),
+        GHAST(56, FLYING_MOB),
 
-        IRON_GOLEM(99, ENTITY_INSENTIENT), // moved up to avoid illegal forward references
-        SHULKER(69, IRON_GOLEM),
-        PIG(90, ENTITY_AGEABLE),
-        SHEEP(91, ENTITY_AGEABLE),
-        COW(92, ENTITY_AGEABLE),
-        CHICKEN(93, ENTITY_AGEABLE),
-        SQUID(94, ENTITY_INSENTIENT),
-        WOLF(95, ENTITY_TAMEABLE_ANIMAL),
-        MUSHROOM_COW(96, COW),
-        SNOWMAN(97, IRON_GOLEM),
-        OCELOT(98, ENTITY_TAMEABLE_ANIMAL),
-        PARROT(105, ENTITY_TAMEABLE_ANIMAL),
+        AMBIENT_CREATURE(LIVING_ENTITY),
+        BAT(65, AMBIENT_CREATURE),
 
-        ABSTRACT_HORSE(-1, ENTITY_AGEABLE),
+        ABSTRACT_GOLEM(ABSTRACT_CREATURE),
+        SNOW_GOLEM(97, ABSTRACT_GOLEM),
+        IRON_GOLEM(99, ABSTRACT_GOLEM),
+        SHULKER(69, ABSTRACT_GOLEM),
+
+        WATER_ANIMAL(ABSTRACT_CREATURE),
+        SQUID(94, WATER_ANIMAL),
+
+        // Ageable mobs and (tamable) animals
+        ABSTRACT_AGEABLE(ABSTRACT_CREATURE),
+        VILLAGER(120, ABSTRACT_AGEABLE),
+
+        ABSTRACT_ANIMAL(ABSTRACT_AGEABLE),
+        CHICKEN(93, ABSTRACT_ANIMAL),
+        COW(92, ABSTRACT_ANIMAL),
+        MOOSHROOM(96, COW),
+        PIG(90, ABSTRACT_ANIMAL),
+        POLAR_BEAR(102, ABSTRACT_ANIMAL),
+        RABBIT(101, ABSTRACT_ANIMAL),
+        SHEEP(91, ABSTRACT_ANIMAL),
+
+        TAMABLE_ANIMAL(ABSTRACT_ANIMAL),
+        OCELOT(98, TAMABLE_ANIMAL),
+        WOLF(95, TAMABLE_ANIMAL),
+
+        ABSTRACT_SHOULDER_RIDING(TAMABLE_ANIMAL),
+        PARROT(105, ABSTRACT_SHOULDER_RIDING),
+
+        // Horses
+        ABSTRACT_HORSE(ABSTRACT_ANIMAL),
         HORSE(100, ABSTRACT_HORSE),
         SKELETON_HORSE(28, ABSTRACT_HORSE),
         ZOMBIE_HORSE(29, ABSTRACT_HORSE),
 
-        CHESTED_HORSE(-1, ABSTRACT_HORSE),
+        CHESTED_HORSE(ABSTRACT_HORSE),
         DONKEY(31, CHESTED_HORSE),
         MULE(32, CHESTED_HORSE),
-        LIAMA(103, CHESTED_HORSE),
+        LLAMA(103, CHESTED_HORSE),
 
+        // Monsters
+        ABSTRACT_MONSTER(ABSTRACT_CREATURE),
+        BLAZE(61, ABSTRACT_MONSTER),
+        CREEPER(50, ABSTRACT_MONSTER),
+        ENDERMITE(67, ABSTRACT_MONSTER),
+        ENDERMAN(58, ABSTRACT_MONSTER),
+        GIANT(53, ABSTRACT_MONSTER),
+        SILVERFISH(60, ABSTRACT_MONSTER),
+        VEX(35, ABSTRACT_MONSTER),
+        WITCH(66, ABSTRACT_MONSTER),
+        WITHER(64, ABSTRACT_MONSTER),
 
-        RABBIT(101, ENTITY_AGEABLE),
-        POLAR_BEAR(102, ENTITY_AGEABLE),
-        VILLAGER(120, ENTITY_AGEABLE),
-        ENDER_CRYSTAL(200, ENTITY),
-        SPLASH_POTION(-1, ENTITY),
-        LINGERING_POTION(-1, SPLASH_POTION),
-        AREA_EFFECT_CLOUD(-1, ENTITY),
-        EGG(-1, ENTITY),
-        FISHING_HOOK(-1, ENTITY),
-        LIGHTNING(-1, ENTITY),
-        WEATHER(-1, ENTITY),
-        PLAYER(-1, ENTITY_HUMAN),
-        COMPLEX_PART(-1, ENTITY),
-        LIAMA_SPIT(-1, ENTITY);
+        ABSTRACT_SKELETON(ABSTRACT_MONSTER),
+        SKELETON(51, ABSTRACT_SKELETON),
+        STRAY(6, ABSTRACT_SKELETON),
+        WITHER_SKELETON(5, ABSTRACT_SKELETON),
+
+        ZOMBIE(54, ABSTRACT_MONSTER),
+        HUSK(23, ZOMBIE),
+        ZOMBIE_PIGMEN(57, ZOMBIE),
+        ZOMBIE_VILLAGER(27, ZOMBIE),
+
+        GUARDIAN(68, ABSTRACT_MONSTER),
+        ELDER_GUARDIAN(4, GUARDIAN),
+        SPIDER(52, ABSTRACT_MONSTER),
+        CAVE_SPIDER(59, ABSTRACT_MONSTER),
+
+        // Illagers
+        ABSTRACT_ILLAGER(ABSTRACT_MONSTER),
+        SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER),
+        VINDICATOR(36, ABSTRACT_ILLAGER),
+        EVOKER(34, SPELLCASTER_ILLAGER),
+        ILLUSIONER(37, SPELLCASTER_ILLAGER);
 
         private static final Map<Integer, EntityType> TYPES = new HashMap<>();
 
         private final int id;
         private final EntityType parent;
 
-        EntityType(int id) {
-            this.id = id;
+        EntityType() {
+            this.id = -1;
             this.parent = null;
         }
 
+        EntityType(EntityType parent) {
+            this.id = -1;
+            this.parent = parent;
+        }
+
         EntityType(int id, EntityType parent) {
             this.id = id;
             this.parent = parent;
@@ -206,20 +236,21 @@ public class EntityTypes1_12 {
             }
         }
 
-        public static Optional<EntityType> findById(int id) {
-            if (id == -1)  // Check if this is called
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static EntityType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
     }
 
     public enum ObjectType implements com.viaversion.viaversion.api.minecraft.entities.ObjectType {
         BOAT(1, EntityType.BOAT),
-        ITEM(2, EntityType.DROPPED_ITEM),
+        ITEM(2, EntityType.ITEM),
         AREA_EFFECT_CLOUD(3, EntityType.AREA_EFFECT_CLOUD),
-        MINECART(10, EntityType.MINECART_RIDEABLE),
-        TNT_PRIMED(50, EntityType.PRIMED_TNT),
-        ENDER_CRYSTAL(51, EntityType.ENDER_CRYSTAL),
+        MINECART(10, EntityType.MINECART), // There are multiple types, but we don't need them
+        TNT_PRIMED(50, EntityType.TNT),
+        ENDER_CRYSTAL(51, EntityType.END_CRYSTAL),
         TIPPED_ARROW(60, EntityType.ARROW),
         SNOWBALL(61, EntityType.SNOWBALL),
         EGG(62, EntityType.EGG),
@@ -228,16 +259,16 @@ public class EntityTypes1_12 {
         ENDER_PEARL(65, EntityType.ENDER_PEARL),
         WITHER_SKULL(66, EntityType.WITHER_SKULL),
         SHULKER_BULLET(67, EntityType.SHULKER_BULLET),
-        LIAMA_SPIT(68, EntityType.LIAMA_SPIT),
+        LLAMA_SPIT(68, EntityType.LLAMA_SPIT),
         FALLING_BLOCK(70, EntityType.FALLING_BLOCK),
         ITEM_FRAME(71, EntityType.ITEM_FRAME),
-        ENDER_SIGNAL(72, EntityType.ENDER_SIGNAL),
-        POTION(73, EntityType.SPLASH_POTION),
-        THROWN_EXP_BOTTLE(75, EntityType.THROWN_EXP_BOTTLE),
-        FIREWORK(76, EntityType.FIREWORK),
-        LEASH(77, EntityType.LEASH_HITCH),
+        EYE_OF_ENDER(72, EntityType.EYE_OF_ENDER),
+        POTION(73, EntityType.POTION),
+        EXPERIENCE_BOTTLE(75, EntityType.EXPERIENCE_BOTTLE),
+        FIREWORK_ROCKET(76, EntityType.FIREWORK_ROCKET),
+        LEASH(77, EntityType.LEASH_KNOT),
         ARMOR_STAND(78, EntityType.ARMOR_STAND),
-        EVOCATION_FANGS(79, EntityType.EVOCATION_FANGS),
+        EVOKER_FANGS(79, EntityType.EVOKER_FANGS),
         FISHIHNG_HOOK(90, EntityType.FISHING_HOOK),
         SPECTRAL_ARROW(91, EntityType.SPECTRAL_ARROW),
         DRAGON_FIREBALL(93, EntityType.DRAGON_FIREBALL);
@@ -268,18 +299,16 @@ public class EntityTypes1_12 {
             return type;
         }
 
-        public static Optional<ObjectType> findById(int id) {
-            if (id == -1)
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static ObjectType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
 
-        public static Optional<EntityType> getPCEntity(int id) {
-            Optional<ObjectType> output = findById(id);
-
-            if (!output.isPresent())
-                return Optional.empty();
-            return Optional.of(output.get().type);
+        public static EntityType getEntityType(final int id) {
+            final ObjectType objectType = findById(id);
+            return objectType != null ? objectType.type : null;
         }
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_13.java

@@ -25,205 +25,197 @@ package com.viaversion.viaversion.api.minecraft.entities;
 import com.viaversion.viaversion.api.Via;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Optional;
 
 public class EntityTypes1_13 {
 
-    public static EntityType getTypeFromId(int typeID, boolean isObject) {
-        Optional<EntityType> type;
+    public static EntityType getTypeFromId(final int typeId, final boolean object) {
+        EntityType type;
 
-        if (isObject)
-            type = ObjectType.getPCEntity(typeID);
-        else
-            type = EntityType.findById(typeID);
-
-        if (!type.isPresent()) {
-            Via.getPlatform().getLogger().severe("Could not find 1.13 type id " + typeID + " isObject=" + isObject);
+        if (object) {
+            type = ObjectType.getEntityType(typeId);
+        } else {
+            type = EntityType.findById(typeId);
+        }
+        if (type == null) {
+            Via.getPlatform().getLogger().severe("Could not find 1.13 type id " + typeId + " objectType=" + object);
             return EntityType.ENTITY; // Fall back to the basic ENTITY
         }
-
-        return type.get();
+        return type;
     }
 
     public enum EntityType implements com.viaversion.viaversion.api.minecraft.entities.EntityType {
-        // Auto generated
 
-        ENTITY(-1), // abm
+        ENTITY,
 
-        AREA_EFFECT_CLOUD(0, ENTITY), // abk
-        END_CRYSTAL(16, ENTITY), // aho
-        EVOKER_FANGS(20, ENTITY), // ala
-        EXPERIENCE_ORB(22, ENTITY), // abs
-        EYE_OF_ENDER(23, ENTITY), // alb
-        FALLING_BLOCK(24, ENTITY), // aix
-        FIREWORK_ROCKET(25, ENTITY), // alc
-        ITEM(32, ENTITY), // aiy
-        LLAMA_SPIT(37, ENTITY), // ale
-        TNT(55, ENTITY), // aiz
-        SHULKER_BULLET(60, ENTITY), // alh
-        FISHING_BOBBER(93, ENTITY), // ais
+        AREA_EFFECT_CLOUD(0, ENTITY),
+        END_CRYSTAL(16, ENTITY),
+        EVOKER_FANGS(20, ENTITY),
+        EXPERIENCE_ORB(22, ENTITY),
+        EYE_OF_ENDER(23, ENTITY),
+        FALLING_BLOCK(24, ENTITY),
+        ITEM(32, ENTITY),
+        TNT(55, ENTITY),
+        LIGHTNING_BOLT(91, ENTITY), // Weather effect entity
 
-        LIVINGENTITY(-1, ENTITY), // abv
-        ARMOR_STAND(1, LIVINGENTITY), // ail
-        PLAYER(92, LIVINGENTITY), // aks
-
-        ABSTRACT_INSENTIENT(-1, LIVINGENTITY), // abw
-        ENDER_DRAGON(17, ABSTRACT_INSENTIENT), // ahp
-
-        ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT), // acd
-
-        ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE), // abj
-        VILLAGER(79, ABSTRACT_AGEABLE), // akn
-
-        // Animals
-        ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE), // agd
-        CHICKEN(7, ABSTRACT_ANIMAL), // age
-        COW(9, ABSTRACT_ANIMAL), // agg
-        MOOSHROOM(47, COW), // agi
-        PIG(51, ABSTRACT_ANIMAL), // agl
-        POLAR_BEAR(54, ABSTRACT_ANIMAL), // agm
-        RABBIT(56, ABSTRACT_ANIMAL), // ago
-        SHEEP(58, ABSTRACT_ANIMAL), // agq
-        TURTLE(73, ABSTRACT_ANIMAL), // agv
-
-        ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL), // acg
-        OCELOT(48, ABSTRACT_TAMEABLE_ANIMAL), // agj
-        WOLF(86, ABSTRACT_TAMEABLE_ANIMAL), // agy
-
-        ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL), // agr
-        PARROT(50, ABSTRACT_PARROT), // agk
-
-        // Horses
-        ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL), // aha
-        CHESTED_HORSE(-1, ABSTRACT_HORSE), // agz
-        DONKEY(11, CHESTED_HORSE), // ahb
-        MULE(46, CHESTED_HORSE), // ahf
-        LLAMA(36, CHESTED_HORSE), // ahe
-        HORSE(29, ABSTRACT_HORSE), // ahc
-        SKELETON_HORSE(63, ABSTRACT_HORSE), // ahg
-        ZOMBIE_HORSE(88, ABSTRACT_HORSE), // ahi
-
-        // Golem
-        ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE), // agc
-        SNOW_GOLEM(66, ABSTRACT_GOLEM), // ags
-        IRON_GOLEM(80, ABSTRACT_GOLEM), // agw
-        SHULKER(59, ABSTRACT_GOLEM), // ajx
-
-        // Fish
-        ABSTRACT_FISHES(-1, ABSTRACT_CREATURE), // agb
-        COD(8, ABSTRACT_FISHES), // agf
-        PUFFERFISH(52, ABSTRACT_FISHES), // agn
-        SALMON(57, ABSTRACT_FISHES), // agp
-        TROPICAL_FISH(72, ABSTRACT_FISHES), // agu
-
-        // Monsters
-        ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE), // ajs
-        BLAZE(4, ABSTRACT_MONSTER), // ajd
-        CREEPER(10, ABSTRACT_MONSTER), // ajf
-        ENDERMITE(19, ABSTRACT_MONSTER), // ajj
-        ENDERMAN(18, ABSTRACT_MONSTER), // aji
-        GIANT(27, ABSTRACT_MONSTER), // ajn
-        SILVERFISH(61, ABSTRACT_MONSTER), // ajy
-        VEX(78, ABSTRACT_MONSTER), // ake
-        WITCH(82, ABSTRACT_MONSTER), // akg
-        WITHER(83, ABSTRACT_MONSTER), // aij
-
-        // Illagers
-        ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER), // ajb
-        ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE), // akb
-        EVOKER(21, ABSTRACT_EVO_ILLU_ILLAGER), // ajl
-        ILLUSIONER(31, ABSTRACT_EVO_ILLU_ILLAGER), // ajq
-        VINDICATOR(81, ABSTRACT_ILLAGER_BASE), // akf
-
-        // Skeletons
-        ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER), // ajc
-        SKELETON(62, ABSTRACT_SKELETON), // ajz
-        STRAY(71, ABSTRACT_SKELETON), // akd
-        WITHER_SKELETON(84, ABSTRACT_SKELETON), // akh
-
-        // Guardians
-        GUARDIAN(28, ABSTRACT_MONSTER), // ajo
-        ELDER_GUARDIAN(15, GUARDIAN), // ajh
-
-        // Spiders
-        SPIDER(69, ABSTRACT_MONSTER), // akc
-        CAVE_SPIDER(6, SPIDER), // aje
-
-        // Zombies - META CHECKED
-        ZOMBIE(87, ABSTRACT_MONSTER), // aki
-        DROWNED(14, ZOMBIE), // ajg
-        HUSK(30, ZOMBIE), // ajp
-        ZOMBIE_PIGMAN(53, ZOMBIE), // aju
-        ZOMBIE_VILLAGER(89, ZOMBIE), // akj
-
-        // Flying entities
-        ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT), // abt
-        GHAST(26, ABSTRACT_FLYING), // ajm
-        PHANTOM(90, ABSTRACT_FLYING), // ajt
-
-        ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT), // afy
-        BAT(3, ABSTRACT_AMBIENT), // afz
-
-        ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT), // agx
-        SQUID(70, ABSTRACT_WATERMOB), // agt
-        DOLPHIN(12, ABSTRACT_WATERMOB),
-
-        // Slimes
-        SLIME(64, ABSTRACT_INSENTIENT), // aka
-        MAGMA_CUBE(38, SLIME), // ajr
-
-        // Hangable objects
-        ABSTRACT_HANGING(-1, ENTITY), // aim
-        LEASH_KNOT(35, ABSTRACT_HANGING), // aio
-        ITEM_FRAME(33, ABSTRACT_HANGING), // ain
-        PAINTING(49, ABSTRACT_HANGING), // aiq
-
-        ABSTRACT_LIGHTNING(-1, ENTITY), // aiu
-        LIGHTNING_BOLT(91, ABSTRACT_LIGHTNING), // aiv
-
-        // Arrows
-        ABSTRACT_ARROW(-1, ENTITY), // akw
-        ARROW(2, ABSTRACT_ARROW), // aky
-        SPECTRAL_ARROW(68, ABSTRACT_ARROW), // alk
-        TRIDENT(94, ABSTRACT_ARROW), // alq
-
-        // Fireballs
-        ABSTRACT_FIREBALL(-1, ENTITY), // akx
-        DRAGON_FIREBALL(13, ABSTRACT_FIREBALL), // akz
-        FIREBALL(34, ABSTRACT_FIREBALL), // ald
-        SMALL_FIREBALL(65, ABSTRACT_FIREBALL), // ali
-        WITHER_SKULL(85, ABSTRACT_FIREBALL), // alr
+        // Hanging entities
+        HANGING_ENTITY(ENTITY),
+        LEASH_KNOT(35, HANGING_ENTITY),
+        ITEM_FRAME(33, HANGING_ENTITY),
+        PAINTING(49, HANGING_ENTITY),
 
         // Projectiles
-        PROJECTILE_ABSTRACT(-1, ENTITY), // all
-        SNOWBALL(67, PROJECTILE_ABSTRACT), // alj
-        ENDER_PEARL(75, PROJECTILE_ABSTRACT), // aln
-        EGG(74, PROJECTILE_ABSTRACT), // alm
-        POTION(77, PROJECTILE_ABSTRACT), // alp
-        EXPERIENCE_BOTTLE(76, PROJECTILE_ABSTRACT), // alo
+        PROJECTILE(ENTITY),
+        FIREWORK_ROCKET(25, ENTITY),
+        LLAMA_SPIT(37, ENTITY),
+        SHULKER_BULLET(60, ENTITY),
+        SNOWBALL(67, PROJECTILE),
+        ENDER_PEARL(75, PROJECTILE),
+        EGG(74, PROJECTILE),
+        EXPERIENCE_BOTTLE(76, PROJECTILE),
+        POTION(77, PROJECTILE),
+        FISHING_BOBBER(93, ENTITY),
+
+        ABSTRACT_ARROW(ENTITY),
+        ARROW(2, ABSTRACT_ARROW),
+        SPECTRAL_ARROW(68, ABSTRACT_ARROW),
+        TRIDENT(94, ABSTRACT_ARROW),
+
+        HURTING_PROJECTILE(ENTITY),
+        DRAGON_FIREBALL(13, HURTING_PROJECTILE),
+        FIREBALL(34, HURTING_PROJECTILE),
+        SMALL_FIREBALL(65, HURTING_PROJECTILE),
+        WITHER_SKULL(85, HURTING_PROJECTILE),
 
         // Vehicles
-        MINECART_ABSTRACT(-1, ENTITY), // alt
-        CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT), // alu
-        CHEST_MINECART(40, CHESTED_MINECART_ABSTRACT), // alx
-        HOPPER_MINECART(43, CHESTED_MINECART_ABSTRACT), // ama
-        MINECART(39, MINECART_ABSTRACT), // alw
-        FURNACE_MINECART(42, MINECART_ABSTRACT), // alz
-        COMMAND_BLOCK_MINECART(41, MINECART_ABSTRACT), // aly
-        TNT_MINECART(45, MINECART_ABSTRACT), // amc
-        SPAWNER_MINECART(44, MINECART_ABSTRACT), // amb
-        BOAT(5, ENTITY); // alv
+        BOAT(5, ENTITY),
+
+        ABSTRACT_MINECART(ENTITY),
+        MINECART(39, ABSTRACT_MINECART),
+        FURNACE_MINECART(42, ABSTRACT_MINECART),
+        COMMAND_BLOCK_MINECART(41, ABSTRACT_MINECART),
+        TNT_MINECART(45, ABSTRACT_MINECART),
+        SPAWNER_MINECART(44, ABSTRACT_MINECART),
+
+        ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART),
+        CHEST_MINECART(40, ABSTRACT_MINECART_CONTAINER),
+        HOPPER_MINECART(43, ABSTRACT_MINECART_CONTAINER),
+
+        LIVING_ENTITY_BASE(ENTITY),
+        ARMOR_STAND(1, LIVING_ENTITY_BASE),
+        PLAYER(92, LIVING_ENTITY_BASE),
+
+        // Living entities as a larger subclass
+        LIVING_ENTITY(LIVING_ENTITY_BASE),
+        ENDER_DRAGON(17, LIVING_ENTITY),
+        ABSTRACT_CREATURE(LIVING_ENTITY),
+        SLIME(64, LIVING_ENTITY),
+        MAGMA_CUBE(38, SLIME),
+
+        // Flying entities
+        FLYING_MOB(ABSTRACT_CREATURE),
+        GHAST(26, FLYING_MOB),
+        PHANTOM(90, FLYING_MOB),
+
+        AMBIENT_CREATURE(-1, LIVING_ENTITY),
+        BAT(3, AMBIENT_CREATURE),
+
+        ABSTRACT_GOLEM(ABSTRACT_CREATURE),
+        SNOW_GOLEM(66, ABSTRACT_GOLEM),
+        IRON_GOLEM(80, ABSTRACT_GOLEM),
+        SHULKER(59, ABSTRACT_GOLEM),
+
+        WATER_ANIMAL(ABSTRACT_CREATURE),
+        SQUID(70, WATER_ANIMAL),
+        DOLPHIN(12, WATER_ANIMAL),
+
+        ABSTRACT_FISH(WATER_ANIMAL),
+        COD(8, ABSTRACT_FISH),
+        PUFFERFISH(52, ABSTRACT_FISH),
+        SALMON(57, ABSTRACT_FISH),
+        TROPICAL_FISH(72, ABSTRACT_FISH),
+
+        // Ageable mobs and (tamable) animals
+        ABSTRACT_AGEABLE(ABSTRACT_CREATURE),
+        VILLAGER(79, ABSTRACT_AGEABLE),
+
+        ABSTRACT_ANIMAL(ABSTRACT_AGEABLE),
+        CHICKEN(7, ABSTRACT_ANIMAL),
+        COW(9, ABSTRACT_ANIMAL),
+        MOOSHROOM(47, COW),
+        PIG(51, ABSTRACT_ANIMAL),
+        POLAR_BEAR(54, ABSTRACT_ANIMAL),
+        RABBIT(56, ABSTRACT_ANIMAL),
+        SHEEP(58, ABSTRACT_ANIMAL),
+        TURTLE(73, ABSTRACT_ANIMAL),
+
+        TAMABLE_ANIMAL(ABSTRACT_ANIMAL),
+        OCELOT(48, TAMABLE_ANIMAL),
+        WOLF(86, TAMABLE_ANIMAL),
+
+        ABSTRACT_SHOULDER_RIDING(TAMABLE_ANIMAL),
+        PARROT(50, ABSTRACT_SHOULDER_RIDING),
+
+        // Horses
+        ABSTRACT_HORSE(ABSTRACT_ANIMAL),
+        HORSE(29, ABSTRACT_HORSE),
+        SKELETON_HORSE(63, ABSTRACT_HORSE),
+        ZOMBIE_HORSE(88, ABSTRACT_HORSE),
+
+        CHESTED_HORSE(ABSTRACT_HORSE),
+        DONKEY(11, CHESTED_HORSE),
+        MULE(46, CHESTED_HORSE),
+        LLAMA(36, CHESTED_HORSE),
+
+        // Monsters
+        ABSTRACT_MONSTER(ABSTRACT_CREATURE),
+        BLAZE(4, ABSTRACT_MONSTER),
+        CREEPER(10, ABSTRACT_MONSTER),
+        ENDERMITE(19, ABSTRACT_MONSTER),
+        ENDERMAN(18, ABSTRACT_MONSTER),
+        GIANT(27, ABSTRACT_MONSTER),
+        SILVERFISH(61, ABSTRACT_MONSTER),
+        VEX(78, ABSTRACT_MONSTER),
+        WITCH(82, ABSTRACT_MONSTER),
+        WITHER(83, ABSTRACT_MONSTER),
+
+        ABSTRACT_SKELETON(ABSTRACT_MONSTER),
+        SKELETON(62, ABSTRACT_SKELETON),
+        STRAY(71, ABSTRACT_SKELETON),
+        WITHER_SKELETON(84, ABSTRACT_SKELETON),
+
+        ZOMBIE(87, ABSTRACT_MONSTER),
+        DROWNED(14, ZOMBIE),
+        HUSK(30, ZOMBIE),
+        ZOMBIE_PIGMAN(53, ZOMBIE),
+        ZOMBIE_VILLAGER(89, ZOMBIE),
+
+        GUARDIAN(28, ABSTRACT_MONSTER),
+        ELDER_GUARDIAN(15, GUARDIAN),
+        SPIDER(69, ABSTRACT_MONSTER),
+        CAVE_SPIDER(6, SPIDER),
+
+        // Illagers
+        ABSTRACT_ILLAGER(ABSTRACT_MONSTER),
+        SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER),
+        VINDICATOR(81, ABSTRACT_ILLAGER),
+        EVOKER(21, SPELLCASTER_ILLAGER),
+        ILLUSIONER(31, SPELLCASTER_ILLAGER);
 
         private static final Map<Integer, EntityType> TYPES = new HashMap<>();
 
         private final int id;
         private final EntityType parent;
 
-        EntityType(int id) {
-            this.id = id;
+        EntityType() {
+            this.id = -1;
             this.parent = null;
         }
 
+        EntityType(EntityType parent) {
+            this.id = -1;
+            this.parent = parent;
+        }
+
         EntityType(int id, EntityType parent) {
             this.id = id;
             this.parent = parent;
@@ -255,10 +247,11 @@ public class EntityTypes1_13 {
             }
         }
 
-        public static Optional<EntityType> findById(int id) {
-            if (id == -1)  // Check if this is called
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static EntityType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
     }
 
@@ -266,7 +259,7 @@ public class EntityTypes1_13 {
         BOAT(1, EntityType.BOAT),
         ITEM(2, EntityType.ITEM),
         AREA_EFFECT_CLOUD(3, EntityType.AREA_EFFECT_CLOUD),
-        MINECART(10, EntityType.MINECART),
+        MINECART(10, EntityType.MINECART), // There are multiple types, but we don't need them
         TNT_PRIMED(50, EntityType.TNT),
         ENDER_CRYSTAL(51, EntityType.END_CRYSTAL),
         TIPPED_ARROW(60, EntityType.ARROW),
@@ -318,24 +311,16 @@ public class EntityTypes1_13 {
             return type;
         }
 
-        public static Optional<ObjectType> findById(int id) {
-            if (id == -1)
-                return Optional.empty();
-            return Optional.ofNullable(TYPES.get(id));
+        public static ObjectType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
         }
 
-        public static Optional<EntityType> getPCEntity(int id) {
-            Optional<ObjectType> output = findById(id);
-            if (!output.isPresent())
-                return Optional.empty();
-            return Optional.of(output.get().type);
-        }
-
-        public static Optional<ObjectType> fromEntityType(EntityType type) {
-            for (ObjectType ent : ObjectType.values())
-                if (ent.type == type)
-                    return Optional.of(ent);
-            return Optional.empty();
+        public static EntityType getEntityType(final int id) {
+            final ObjectType objectType = findById(id);
+            return objectType != null ? objectType.type : null;
         }
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_14.java

@@ -22,223 +22,233 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_14 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(17, ENTITY),
-    EVOKER_FANGS(21, ENTITY),
-    EXPERIENCE_ORB(23, ENTITY),
-    EYE_OF_ENDER(24, ENTITY),
-    FALLING_BLOCK(25, ENTITY),
-    FIREWORK_ROCKET(26, ENTITY),
-    ITEM(34, ENTITY),
-    LLAMA_SPIT(39, ENTITY),
-    TNT(58, ENTITY),
-    SHULKER_BULLET(63, ENTITY),
-    FISHING_BOBBER(101, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(100, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(18, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(84, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(88, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(13, ABSTRACT_INSENTIENT),
-    CHICKEN(8, ABSTRACT_ANIMAL),
-    COW(10, ABSTRACT_ANIMAL),
-    MOOSHROOM(49, COW),
-    PANDA(52, ABSTRACT_INSENTIENT),
-    PIG(54, ABSTRACT_ANIMAL),
-    POLAR_BEAR(57, ABSTRACT_ANIMAL),
-    RABBIT(59, ABSTRACT_ANIMAL),
-    SHEEP(61, ABSTRACT_ANIMAL),
-    TURTLE(77, ABSTRACT_ANIMAL),
-    FOX(27, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(6, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(50, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(93, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(53, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(12, CHESTED_HORSE),
-    MULE(48, CHESTED_HORSE),
-    LLAMA(38, CHESTED_HORSE),
-    TRADER_LLAMA(75, CHESTED_HORSE),
-    HORSE(31, ABSTRACT_HORSE),
-    SKELETON_HORSE(66, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(95, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(69, ABSTRACT_GOLEM),
-    IRON_GOLEM(85, ABSTRACT_GOLEM),
-    SHULKER(62, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(9, ABSTRACT_FISHES),
-    PUFFERFISH(55, ABSTRACT_FISHES),
-    SALMON(60, ABSTRACT_FISHES),
-    TROPICAL_FISH(76, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(4, ABSTRACT_MONSTER),
-    CREEPER(11, ABSTRACT_MONSTER),
-    ENDERMITE(20, ABSTRACT_MONSTER),
-    ENDERMAN(19, ABSTRACT_MONSTER),
-    GIANT(29, ABSTRACT_MONSTER),
-    SILVERFISH(64, ABSTRACT_MONSTER),
-    VEX(83, ABSTRACT_MONSTER),
-    WITCH(89, ABSTRACT_MONSTER),
-    WITHER(90, ABSTRACT_MONSTER),
-    RAVAGER(98, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(22, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(33, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(86, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(87, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(65, ABSTRACT_SKELETON),
-    STRAY(74, ABSTRACT_SKELETON),
-    WITHER_SKELETON(91, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(30, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(16, GUARDIAN),
-
-    // Spiders
-    SPIDER(72, ABSTRACT_MONSTER),
-    CAVE_SPIDER(7, SPIDER),
-
-    // Zombies - META CHECKED
-    ZOMBIE(94, ABSTRACT_MONSTER),
-    DROWNED(15, ZOMBIE),
-    HUSK(32, ZOMBIE),
-    ZOMBIE_PIGMAN(56, ZOMBIE),
-    ZOMBIE_VILLAGER(96, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(28, ABSTRACT_FLYING),
-    PHANTOM(97, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(73, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(67, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(40, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(37, ABSTRACT_HANGING),
-    ITEM_FRAME(35, ABSTRACT_HANGING),
-    PAINTING(51, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(99, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(71, ABSTRACT_ARROW),
-    TRIDENT(82, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(14, ABSTRACT_FIREBALL),
-    FIREBALL(36, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(68, ABSTRACT_FIREBALL),
-    WITHER_SKULL(92, ABSTRACT_FIREBALL),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(70, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(79, PROJECTILE_ABSTRACT),
-    EGG(78, PROJECTILE_ABSTRACT),
-    POTION(81, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(80, PROJECTILE_ABSTRACT),
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(42, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(45, CHESTED_MINECART_ABSTRACT),
-    MINECART(41, MINECART_ABSTRACT),
-    FURNACE_MINECART(44, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(43, MINECART_ABSTRACT),
-    TNT_MINECART(47, MINECART_ABSTRACT),
-    SPAWNER_MINECART(46, MINECART_ABSTRACT),
-    BOAT(5, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
 
-    private final int id;
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+    SQUID(WATER_ANIMAL),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIE_PIGMAN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_14(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_14(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
-    EntityTypes1_14(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_14(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_15.java

@@ -22,225 +22,234 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_15 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(18, ENTITY),
-    EVOKER_FANGS(22, ENTITY),
-    EXPERIENCE_ORB(24, ENTITY),
-    EYE_OF_ENDER(25, ENTITY),
-    FALLING_BLOCK(26, ENTITY),
-    FIREWORK_ROCKET(27, ENTITY),
-    ITEM(35, ENTITY),
-    LLAMA_SPIT(40, ENTITY),
-    TNT(59, ENTITY),
-    SHULKER_BULLET(64, ENTITY),
-    FISHING_BOBBER(102, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(101, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(19, ABSTRACT_INSENTIENT),
-
-    BEE(4, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(85, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(89, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(14, ABSTRACT_INSENTIENT),
-    CHICKEN(9, ABSTRACT_ANIMAL),
-    COW(11, ABSTRACT_ANIMAL),
-    MOOSHROOM(50, COW),
-    PANDA(53, ABSTRACT_INSENTIENT),
-    PIG(55, ABSTRACT_ANIMAL),
-    POLAR_BEAR(58, ABSTRACT_ANIMAL),
-    RABBIT(60, ABSTRACT_ANIMAL),
-    SHEEP(62, ABSTRACT_ANIMAL),
-    TURTLE(78, ABSTRACT_ANIMAL),
-    FOX(28, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(7, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(51, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(94, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(54, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(13, CHESTED_HORSE),
-    MULE(49, CHESTED_HORSE),
-    LLAMA(39, CHESTED_HORSE),
-    TRADER_LLAMA(76, CHESTED_HORSE),
-    HORSE(32, ABSTRACT_HORSE),
-    SKELETON_HORSE(67, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(96, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(70, ABSTRACT_GOLEM),
-    IRON_GOLEM(86, ABSTRACT_GOLEM),
-    SHULKER(63, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(10, ABSTRACT_FISHES),
-    PUFFERFISH(56, ABSTRACT_FISHES),
-    SALMON(61, ABSTRACT_FISHES),
-    TROPICAL_FISH(77, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(5, ABSTRACT_MONSTER),
-    CREEPER(12, ABSTRACT_MONSTER),
-    ENDERMITE(21, ABSTRACT_MONSTER),
-    ENDERMAN(20, ABSTRACT_MONSTER),
-    GIANT(30, ABSTRACT_MONSTER),
-    SILVERFISH(65, ABSTRACT_MONSTER),
-    VEX(84, ABSTRACT_MONSTER),
-    WITCH(90, ABSTRACT_MONSTER),
-    WITHER(91, ABSTRACT_MONSTER),
-    RAVAGER(99, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(23, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(34, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(87, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(88, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(66, ABSTRACT_SKELETON),
-    STRAY(75, ABSTRACT_SKELETON),
-    WITHER_SKELETON(92, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(31, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(17, GUARDIAN),
-
-    // Spiders
-    SPIDER(73, ABSTRACT_MONSTER),
-    CAVE_SPIDER(8, SPIDER),
-
-    // Zombies
-    ZOMBIE(95, ABSTRACT_MONSTER),
-    DROWNED(16, ZOMBIE),
-    HUSK(33, ZOMBIE),
-    ZOMBIE_PIGMAN(57, ZOMBIE),
-    ZOMBIE_VILLAGER(97, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(29, ABSTRACT_FLYING),
-    PHANTOM(98, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(74, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(68, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(41, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(38, ABSTRACT_HANGING),
-    ITEM_FRAME(36, ABSTRACT_HANGING),
-    PAINTING(52, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(100, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(72, ABSTRACT_ARROW),
-    TRIDENT(83, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(15, ABSTRACT_FIREBALL),
-    FIREBALL(37, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(69, ABSTRACT_FIREBALL),
-    WITHER_SKULL(93, ABSTRACT_FIREBALL),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(71, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(80, PROJECTILE_ABSTRACT),
-    EGG(79, PROJECTILE_ABSTRACT),
-    POTION(82, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(81, PROJECTILE_ABSTRACT),
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(43, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(46, CHESTED_MINECART_ABSTRACT),
-    MINECART(42, MINECART_ABSTRACT),
-    FURNACE_MINECART(45, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(44, MINECART_ABSTRACT),
-    TNT_MINECART(48, MINECART_ABSTRACT),
-    SPAWNER_MINECART(47, MINECART_ABSTRACT),
-    BOAT(6, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
 
-    private final int id;
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+    SQUID(WATER_ANIMAL),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIE_PIGMAN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_15(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_15(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
-    EntityTypes1_15(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_15(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_16.java

@@ -22,230 +22,238 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_16 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(18, ENTITY),
-    EVOKER_FANGS(23, ENTITY),
-    EXPERIENCE_ORB(24, ENTITY),
-    EYE_OF_ENDER(25, ENTITY),
-    FALLING_BLOCK(26, ENTITY),
-    FIREWORK_ROCKET(27, ENTITY),
-    ITEM(37, ENTITY),
-    LLAMA_SPIT(43, ENTITY),
-    TNT(63, ENTITY),
-    SHULKER_BULLET(70, ENTITY),
-    FISHING_BOBBER(106, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(105, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(19, ABSTRACT_INSENTIENT),
-
-    BEE(4, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(92, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(94, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(13, ABSTRACT_INSENTIENT),
-    CHICKEN(9, ABSTRACT_ANIMAL),
-    COW(11, ABSTRACT_ANIMAL),
-    MOOSHROOM(53, COW),
-    PANDA(56, ABSTRACT_INSENTIENT),
-    PIG(59, ABSTRACT_ANIMAL),
-    POLAR_BEAR(62, ABSTRACT_ANIMAL),
-    RABBIT(65, ABSTRACT_ANIMAL),
-    SHEEP(68, ABSTRACT_ANIMAL),
-    TURTLE(90, ABSTRACT_ANIMAL),
-    FOX(28, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(7, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(54, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(99, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(57, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(14, CHESTED_HORSE),
-    MULE(52, CHESTED_HORSE),
-    LLAMA(42, CHESTED_HORSE),
-    TRADER_LLAMA(88, CHESTED_HORSE),
-    HORSE(33, ABSTRACT_HORSE),
-    SKELETON_HORSE(73, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(102, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(76, ABSTRACT_GOLEM),
-    IRON_GOLEM(36, ABSTRACT_GOLEM),
-    SHULKER(69, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(10, ABSTRACT_FISHES),
-    PUFFERFISH(64, ABSTRACT_FISHES),
-    SALMON(67, ABSTRACT_FISHES),
-    TROPICAL_FISH(89, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(5, ABSTRACT_MONSTER),
-    CREEPER(12, ABSTRACT_MONSTER),
-    ENDERMITE(21, ABSTRACT_MONSTER),
-    ENDERMAN(20, ABSTRACT_MONSTER),
-    GIANT(30, ABSTRACT_MONSTER),
-    SILVERFISH(71, ABSTRACT_MONSTER),
-    VEX(91, ABSTRACT_MONSTER),
-    WITCH(95, ABSTRACT_MONSTER),
-    WITHER(96, ABSTRACT_MONSTER),
-    RAVAGER(66, ABSTRACT_MONSTER),
-    PIGLIN(60, ABSTRACT_MONSTER),
-
-    HOGLIN(32, ABSTRACT_ANIMAL),
-    STRIDER(82, ABSTRACT_ANIMAL),
-    ZOGLIN(100, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(22, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(35, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(93, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(61, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(72, ABSTRACT_SKELETON),
-    STRAY(81, ABSTRACT_SKELETON),
-    WITHER_SKELETON(97, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(31, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(17, GUARDIAN),
-
-    // Spiders
-    SPIDER(79, ABSTRACT_MONSTER),
-    CAVE_SPIDER(8, SPIDER),
-
-    // Zombies
-    ZOMBIE(101, ABSTRACT_MONSTER),
-    DROWNED(16, ZOMBIE),
-    HUSK(34, ZOMBIE),
-    ZOMBIFIED_PIGLIN(104, ZOMBIE),
-    ZOMBIE_VILLAGER(103, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(29, ABSTRACT_FLYING),
-    PHANTOM(58, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(80, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(74, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(44, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(40, ABSTRACT_HANGING),
-    ITEM_FRAME(38, ABSTRACT_HANGING),
-    PAINTING(55, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(41, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(78, ABSTRACT_ARROW),
-    TRIDENT(87, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(15, ABSTRACT_FIREBALL),
-    FIREBALL(39, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(75, ABSTRACT_FIREBALL),
-    WITHER_SKULL(98, ABSTRACT_FIREBALL),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(77, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(84, PROJECTILE_ABSTRACT),
-    EGG(83, PROJECTILE_ABSTRACT),
-    POTION(86, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(85, PROJECTILE_ABSTRACT),
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(46, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(49, CHESTED_MINECART_ABSTRACT),
-    MINECART(45, MINECART_ABSTRACT),
-    FURNACE_MINECART(48, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(47, MINECART_ABSTRACT),
-    TNT_MINECART(51, MINECART_ABSTRACT),
-    SPAWNER_MINECART(50, MINECART_ABSTRACT),
-    BOAT(6, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
 
-    private final int id;
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+    SQUID(WATER_ANIMAL),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+    PIGLIN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_16(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_16(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
-    EntityTypes1_16(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_16(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_16_2.java

@@ -22,234 +22,241 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_16_2 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(18, ENTITY),
-    EVOKER_FANGS(23, ENTITY),
-    EXPERIENCE_ORB(24, ENTITY),
-    EYE_OF_ENDER(25, ENTITY),
-    FALLING_BLOCK(26, ENTITY),
-    FIREWORK_ROCKET(27, ENTITY),
-    ITEM(37, ENTITY),
-    LLAMA_SPIT(43, ENTITY),
-    TNT(64, ENTITY),
-    SHULKER_BULLET(71, ENTITY),
-    FISHING_BOBBER(107, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    PLAYER(106, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(19, ABSTRACT_INSENTIENT),
-
-    BEE(4, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(93, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(95, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    DOLPHIN(13, ABSTRACT_INSENTIENT),
-    CHICKEN(9, ABSTRACT_ANIMAL),
-    COW(11, ABSTRACT_ANIMAL),
-    MOOSHROOM(53, COW),
-    PANDA(56, ABSTRACT_INSENTIENT),
-    PIG(59, ABSTRACT_ANIMAL),
-    POLAR_BEAR(63, ABSTRACT_ANIMAL),
-    RABBIT(66, ABSTRACT_ANIMAL),
-    SHEEP(69, ABSTRACT_ANIMAL),
-    TURTLE(91, ABSTRACT_ANIMAL),
-    FOX(28, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(7, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(54, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(100, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(57, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(14, CHESTED_HORSE),
-    MULE(52, CHESTED_HORSE),
-    LLAMA(42, CHESTED_HORSE),
-    TRADER_LLAMA(89, CHESTED_HORSE),
-    HORSE(33, ABSTRACT_HORSE),
-    SKELETON_HORSE(74, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(103, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(77, ABSTRACT_GOLEM),
-    IRON_GOLEM(36, ABSTRACT_GOLEM),
-    SHULKER(70, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(10, ABSTRACT_FISHES),
-    PUFFERFISH(65, ABSTRACT_FISHES),
-    SALMON(68, ABSTRACT_FISHES),
-    TROPICAL_FISH(90, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(5, ABSTRACT_MONSTER),
-    CREEPER(12, ABSTRACT_MONSTER),
-    ENDERMITE(21, ABSTRACT_MONSTER),
-    ENDERMAN(20, ABSTRACT_MONSTER),
-    GIANT(30, ABSTRACT_MONSTER),
-    SILVERFISH(72, ABSTRACT_MONSTER),
-    VEX(92, ABSTRACT_MONSTER),
-    WITCH(96, ABSTRACT_MONSTER),
-    WITHER(97, ABSTRACT_MONSTER),
-    RAVAGER(67, ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(-1, ABSTRACT_MONSTER),
-
-    PIGLIN(60, ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(61, ABSTRACT_PIGLIN),
-
-    HOGLIN(32, ABSTRACT_ANIMAL),
-    STRIDER(83, ABSTRACT_ANIMAL),
-    ZOGLIN(101, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(22, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(35, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(94, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(62, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(73, ABSTRACT_SKELETON),
-    STRAY(82, ABSTRACT_SKELETON),
-    WITHER_SKELETON(98, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(31, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(17, GUARDIAN),
-
-    // Spiders
-    SPIDER(80, ABSTRACT_MONSTER),
-    CAVE_SPIDER(8, SPIDER),
-
-    // Zombies
-    ZOMBIE(102, ABSTRACT_MONSTER),
-    DROWNED(16, ZOMBIE),
-    HUSK(34, ZOMBIE),
-    ZOMBIFIED_PIGLIN(105, ZOMBIE),
-    ZOMBIE_VILLAGER(104, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(29, ABSTRACT_FLYING),
-    PHANTOM(58, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(3, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(81, ABSTRACT_WATERMOB),
-
-    // Slimes
-    SLIME(75, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(44, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(40, ABSTRACT_HANGING),
-    ITEM_FRAME(38, ABSTRACT_HANGING),
-    PAINTING(55, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(41, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(79, ABSTRACT_ARROW),
-    TRIDENT(88, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(15, ABSTRACT_FIREBALL),
-    FIREBALL(39, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(76, ABSTRACT_FIREBALL),
-    WITHER_SKULL(99, ABSTRACT_FIREBALL),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(78, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(85, PROJECTILE_ABSTRACT),
-    EGG(84, PROJECTILE_ABSTRACT),
-    POTION(87, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(86, PROJECTILE_ABSTRACT),
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(46, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(49, CHESTED_MINECART_ABSTRACT),
-    MINECART(45, MINECART_ABSTRACT),
-    FURNACE_MINECART(48, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(47, MINECART_ABSTRACT),
-    TNT_MINECART(51, MINECART_ABSTRACT),
-    SPAWNER_MINECART(50, MINECART_ABSTRACT),
-    BOAT(6, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
 
-    private final int id;
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+    SQUID(WATER_ANIMAL),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_16_2(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_16_2(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
-    EntityTypes1_16_2(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_16_2(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
-}
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_17.java

@@ -22,239 +22,247 @@
  */
 package com.viaversion.viaversion.api.minecraft.entities;
 
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
+import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_17 implements EntityType {
 
-    ENTITY(-1),
+    ENTITY(null, null),
 
-    AREA_EFFECT_CLOUD(0, ENTITY),
-    END_CRYSTAL(19, ENTITY),
-    EVOKER_FANGS(24, ENTITY),
-    EXPERIENCE_ORB(25, ENTITY),
-    EYE_OF_ENDER(26, ENTITY),
-    FALLING_BLOCK(27, ENTITY),
-    FIREWORK_ROCKET(28, ENTITY),
-    ITEM(41, ENTITY),
-    LLAMA_SPIT(47, ENTITY),
-    TNT(69, ENTITY),
-    SHULKER_BULLET(76, ENTITY),
-    FISHING_BOBBER(112, ENTITY),
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    LIVINGENTITY(-1, ENTITY),
-    ARMOR_STAND(1, LIVINGENTITY),
-    MARKER(49, ENTITY),
-    PLAYER(111, LIVINGENTITY),
-
-    ABSTRACT_INSENTIENT(-1, LIVINGENTITY),
-    ENDER_DRAGON(20, ABSTRACT_INSENTIENT),
-
-    BEE(5, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_CREATURE(-1, ABSTRACT_INSENTIENT),
-
-    ABSTRACT_AGEABLE(-1, ABSTRACT_CREATURE),
-    VILLAGER(98, ABSTRACT_AGEABLE),
-    WANDERING_TRADER(100, ABSTRACT_AGEABLE),
-
-    // Animals
-    ABSTRACT_ANIMAL(-1, ABSTRACT_AGEABLE),
-    AXOLOTL(3, ABSTRACT_ANIMAL),
-    DOLPHIN(14, ABSTRACT_INSENTIENT),
-    CHICKEN(10, ABSTRACT_ANIMAL),
-    COW(12, ABSTRACT_ANIMAL),
-    MOOSHROOM(58, COW),
-    PANDA(61, ABSTRACT_INSENTIENT),
-    PIG(64, ABSTRACT_ANIMAL),
-    POLAR_BEAR(68, ABSTRACT_ANIMAL),
-    RABBIT(71, ABSTRACT_ANIMAL),
-    SHEEP(74, ABSTRACT_ANIMAL),
-    TURTLE(96, ABSTRACT_ANIMAL),
-    FOX(29, ABSTRACT_ANIMAL),
-    GOAT(34, ABSTRACT_ANIMAL),
-
-    ABSTRACT_TAMEABLE_ANIMAL(-1, ABSTRACT_ANIMAL),
-    CAT(8, ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(59, ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(105, ABSTRACT_TAMEABLE_ANIMAL),
-
-    ABSTRACT_PARROT(-1, ABSTRACT_TAMEABLE_ANIMAL),
-    PARROT(62, ABSTRACT_PARROT),
-
-    // Horses
-    ABSTRACT_HORSE(-1, ABSTRACT_ANIMAL),
-    CHESTED_HORSE(-1, ABSTRACT_HORSE),
-    DONKEY(15, CHESTED_HORSE),
-    MULE(57, CHESTED_HORSE),
-    LLAMA(46, CHESTED_HORSE),
-    TRADER_LLAMA(94, CHESTED_HORSE),
-    HORSE(37, ABSTRACT_HORSE),
-    SKELETON_HORSE(79, ABSTRACT_HORSE),
-    ZOMBIE_HORSE(108, ABSTRACT_HORSE),
-
-    // Golem
-    ABSTRACT_GOLEM(-1, ABSTRACT_CREATURE),
-    SNOW_GOLEM(82, ABSTRACT_GOLEM),
-    IRON_GOLEM(40, ABSTRACT_GOLEM),
-    SHULKER(75, ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(-1, ABSTRACT_CREATURE),
-    COD(11, ABSTRACT_FISHES),
-    PUFFERFISH(70, ABSTRACT_FISHES),
-    SALMON(73, ABSTRACT_FISHES),
-    TROPICAL_FISH(95, ABSTRACT_FISHES),
-
-    // Monsters
-    ABSTRACT_MONSTER(-1, ABSTRACT_CREATURE),
-    BLAZE(6, ABSTRACT_MONSTER),
-    CREEPER(13, ABSTRACT_MONSTER),
-    ENDERMITE(22, ABSTRACT_MONSTER),
-    ENDERMAN(21, ABSTRACT_MONSTER),
-    GIANT(31, ABSTRACT_MONSTER),
-    SILVERFISH(77, ABSTRACT_MONSTER),
-    VEX(97, ABSTRACT_MONSTER),
-    WITCH(101, ABSTRACT_MONSTER),
-    WITHER(102, ABSTRACT_MONSTER),
-    RAVAGER(72, ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(-1, ABSTRACT_MONSTER),
-
-    PIGLIN(65, ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(66, ABSTRACT_PIGLIN),
-
-    HOGLIN(36, ABSTRACT_ANIMAL),
-    STRIDER(88, ABSTRACT_ANIMAL),
-    ZOGLIN(106, ABSTRACT_MONSTER),
-
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(-1, ABSTRACT_MONSTER),
-    ABSTRACT_EVO_ILLU_ILLAGER(-1, ABSTRACT_ILLAGER_BASE),
-    EVOKER(23, ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(39, ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(99, ABSTRACT_ILLAGER_BASE),
-    PILLAGER(67, ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
-    ABSTRACT_SKELETON(-1, ABSTRACT_MONSTER),
-    SKELETON(78, ABSTRACT_SKELETON),
-    STRAY(87, ABSTRACT_SKELETON),
-    WITHER_SKELETON(103, ABSTRACT_SKELETON),
-
-    // Guardians
-    GUARDIAN(35, ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(18, GUARDIAN),
-
-    // Spiders
-    SPIDER(85, ABSTRACT_MONSTER),
-    CAVE_SPIDER(9, SPIDER),
-
-    // Zombies
-    ZOMBIE(107, ABSTRACT_MONSTER),
-    DROWNED(17, ZOMBIE),
-    HUSK(38, ZOMBIE),
-    ZOMBIFIED_PIGLIN(110, ZOMBIE),
-    ZOMBIE_VILLAGER(109, ZOMBIE),
-
-    // Flying entities
-    ABSTRACT_FLYING(-1, ABSTRACT_INSENTIENT),
-    GHAST(30, ABSTRACT_FLYING),
-    PHANTOM(63, ABSTRACT_FLYING),
-
-    ABSTRACT_AMBIENT(-1, ABSTRACT_INSENTIENT),
-    BAT(4, ABSTRACT_AMBIENT),
-
-    ABSTRACT_WATERMOB(-1, ABSTRACT_INSENTIENT),
-    SQUID(86, ABSTRACT_WATERMOB),
-    GLOW_SQUID(33, SQUID),
-
-    // Slimes
-    SLIME(80, ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(48, SLIME),
-
-    // Hangable objects
-    ABSTRACT_HANGING(-1, ENTITY),
-    LEASH_KNOT(44, ABSTRACT_HANGING),
-    ITEM_FRAME(42, ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(32, ITEM_FRAME),
-    PAINTING(60, ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(-1, ENTITY),
-    LIGHTNING_BOLT(45, ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(-1, ENTITY),
-    ARROW(2, ABSTRACT_ARROW),
-    SPECTRAL_ARROW(84, ABSTRACT_ARROW),
-    TRIDENT(93, ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(-1, ENTITY),
-    DRAGON_FIREBALL(16, ABSTRACT_FIREBALL),
-    FIREBALL(43, ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(81, ABSTRACT_FIREBALL),
-    WITHER_SKULL(104, ABSTRACT_FIREBALL),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
 
     // Projectiles
-    PROJECTILE_ABSTRACT(-1, ENTITY),
-    SNOWBALL(83, PROJECTILE_ABSTRACT),
-    ENDER_PEARL(90, PROJECTILE_ABSTRACT),
-    EGG(89, PROJECTILE_ABSTRACT),
-    POTION(92, PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(91, PROJECTILE_ABSTRACT),
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
     // Vehicles
-    MINECART_ABSTRACT(-1, ENTITY),
-    CHESTED_MINECART_ABSTRACT(-1, MINECART_ABSTRACT),
-    CHEST_MINECART(51, CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(54, CHESTED_MINECART_ABSTRACT),
-    MINECART(50, MINECART_ABSTRACT),
-    FURNACE_MINECART(53, MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(52, MINECART_ABSTRACT),
-    TNT_MINECART(56, MINECART_ABSTRACT),
-    SPAWNER_MINECART(55, MINECART_ABSTRACT),
-    BOAT(7, ENTITY);
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    private static final EntityType[] TYPES;
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
 
-    private final int id;
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+
+    SQUID(WATER_ANIMAL),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
 
-    EntityTypes1_17(int id) {
-        this.id = id;
-        this.parent = null;
+    EntityTypes1_17(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
-    EntityTypes1_17(int id, EntityType parent) {
-        this.id = id;
+    EntityTypes1_17(final EntityType parent, @Nullable final String identifier) {
         this.parent = parent;
+        this.identifier = identifier;
     }
 
     @Override
     public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
         return id;
     }
 
     @Override
-    public EntityType getParent() {
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
         return parent;
     }
 
-    @Override
-    public String identifier() {
-        throw new UnsupportedOperationException();
-    }
-
     @Override
     public boolean isAbstractType() {
-        return id != -1;
+        return identifier == null;
     }
 
-    static {
-        TYPES = EntityTypeUtil.toOrderedArray(values());
-    }
-
-    public static EntityType getTypeFromId(int typeId) {
+    public static EntityType getTypeFromId(final int typeId) {
         return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
     }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_19.java

@@ -26,6 +26,7 @@ import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
 import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_19 implements EntityType {
@@ -38,80 +39,147 @@ public enum EntityTypes1_19 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
-    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
 
-    BEE(ABSTRACT_INSENTIENT),
+    // Projectiles
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
 
-    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
 
-    // Animals
-    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
-    AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
-    CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
-    PIG(ABSTRACT_ANIMAL),
-    POLAR_BEAR(ABSTRACT_ANIMAL),
-    RABBIT(ABSTRACT_ANIMAL),
-    SHEEP(ABSTRACT_ANIMAL),
-    TURTLE(ABSTRACT_ANIMAL),
-    FOX(ABSTRACT_ANIMAL),
-    FROG(ABSTRACT_ANIMAL),
-    GOAT(ABSTRACT_ANIMAL),
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
 
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+    CHEST_BOAT(BOAT),
 
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
 
-    // Horses
-    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
-    HORSE(ABSTRACT_HORSE),
-    SKELETON_HORSE(ABSTRACT_HORSE),
-    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
 
-    // Golem
-    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
     SNOW_GOLEM(ABSTRACT_GOLEM),
     IRON_GOLEM(ABSTRACT_GOLEM),
     SHULKER(ABSTRACT_GOLEM),
 
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
-    PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+
+    SQUID(WATER_ANIMAL),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
-    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
     BLAZE(ABSTRACT_MONSTER),
     CREEPER(ABSTRACT_MONSTER),
     ENDERMITE(ABSTRACT_MONSTER),
@@ -119,110 +187,42 @@ public enum EntityTypes1_19 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
@@ -231,7 +231,7 @@ public enum EntityTypes1_19 implements EntityType {
 
     EntityTypes1_19(final EntityType parent) {
         this.parent = parent;
-        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
     EntityTypes1_19(final EntityType parent, @Nullable final String identifier) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_19_3.java

@@ -26,6 +26,7 @@ import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
 import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_19_3 implements EntityType {
@@ -38,81 +39,148 @@ public enum EntityTypes1_19_3 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
 
-    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
-    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
 
-    BEE(ABSTRACT_INSENTIENT),
+    // Projectiles
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
 
-    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+    CHEST_BOAT(BOAT),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+
+    SQUID(WATER_ANIMAL),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
 
-    // Animals
     ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
     AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
     CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
+    PANDA(ABSTRACT_ANIMAL),
     PIG(ABSTRACT_ANIMAL),
     POLAR_BEAR(ABSTRACT_ANIMAL),
     RABBIT(ABSTRACT_ANIMAL),
     SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
     TURTLE(ABSTRACT_ANIMAL),
     FOX(ABSTRACT_ANIMAL),
     FROG(ABSTRACT_ANIMAL),
     GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
 
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
 
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
 
-    // Horses
     ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
     HORSE(ABSTRACT_HORSE),
     SKELETON_HORSE(ABSTRACT_HORSE),
     ZOMBIE_HORSE(ABSTRACT_HORSE),
     CAMEL(ABSTRACT_HORSE),
 
-    // Golem
-    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
-    SNOW_GOLEM(ABSTRACT_GOLEM),
-    IRON_GOLEM(ABSTRACT_GOLEM),
-    SHULKER(ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
-    PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
-    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
     BLAZE(ABSTRACT_MONSTER),
     CREEPER(ABSTRACT_MONSTER),
     ENDERMITE(ABSTRACT_MONSTER),
@@ -120,110 +188,42 @@ public enum EntityTypes1_19_3 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
@@ -232,7 +232,7 @@ public enum EntityTypes1_19_3 implements EntityType {
 
     EntityTypes1_19_3(final EntityType parent) {
         this.parent = parent;
-        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
     EntityTypes1_19_3(final EntityType parent, @Nullable final String identifier) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_19_4.java

@@ -26,6 +26,7 @@ import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
 import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_19_4 implements EntityType {
@@ -38,88 +39,155 @@ public enum EntityTypes1_19_4 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
 
     DISPLAY(ENTITY, null),
     BLOCK_DISPLAY(DISPLAY),
     ITEM_DISPLAY(DISPLAY),
     TEXT_DISPLAY(DISPLAY),
-    INTERACTION(ENTITY),
 
-    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
-    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
 
-    BEE(ABSTRACT_INSENTIENT),
+    // Projectiles
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
 
-    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+    CHEST_BOAT(BOAT),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+
+    SQUID(WATER_ANIMAL),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
 
-    // Animals
     ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
     AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
     CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
+    PANDA(ABSTRACT_ANIMAL),
     PIG(ABSTRACT_ANIMAL),
     POLAR_BEAR(ABSTRACT_ANIMAL),
     RABBIT(ABSTRACT_ANIMAL),
     SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
     TURTLE(ABSTRACT_ANIMAL),
     FOX(ABSTRACT_ANIMAL),
     FROG(ABSTRACT_ANIMAL),
     GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
     SNIFFER(ABSTRACT_ANIMAL),
 
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
 
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
 
-    // Horses
     ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
     HORSE(ABSTRACT_HORSE),
     SKELETON_HORSE(ABSTRACT_HORSE),
     ZOMBIE_HORSE(ABSTRACT_HORSE),
     CAMEL(ABSTRACT_HORSE),
 
-    // Golem
-    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
-    SNOW_GOLEM(ABSTRACT_GOLEM),
-    IRON_GOLEM(ABSTRACT_GOLEM),
-    SHULKER(ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
-    PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
-    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
     BLAZE(ABSTRACT_MONSTER),
     CREEPER(ABSTRACT_MONSTER),
     ENDERMITE(ABSTRACT_MONSTER),
@@ -127,110 +195,42 @@ public enum EntityTypes1_19_4 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
@@ -239,7 +239,7 @@ public enum EntityTypes1_19_4 implements EntityType {
 
     EntityTypes1_19_4(final EntityType parent) {
         this.parent = parent;
-        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
     EntityTypes1_19_4(final EntityType parent, @Nullable final String identifier) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_20_3.java

@@ -26,6 +26,7 @@ import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.util.EntityTypeUtil;
 import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum EntityTypes1_20_3 implements EntityType {
@@ -38,88 +39,156 @@ public enum EntityTypes1_20_3 implements EntityType {
     EXPERIENCE_ORB(ENTITY),
     EYE_OF_ENDER(ENTITY),
     FALLING_BLOCK(ENTITY),
-    FIREWORK_ROCKET(ENTITY),
     ITEM(ENTITY),
-    LLAMA_SPIT(ENTITY),
     TNT(ENTITY),
-    SHULKER_BULLET(ENTITY),
-    FISHING_BOBBER(ENTITY),
-
-    LIVINGENTITY(ENTITY, null),
-    ARMOR_STAND(LIVINGENTITY),
     MARKER(ENTITY),
-    PLAYER(LIVINGENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
 
     DISPLAY(ENTITY, null),
     BLOCK_DISPLAY(DISPLAY),
     ITEM_DISPLAY(DISPLAY),
     TEXT_DISPLAY(DISPLAY),
-    INTERACTION(ENTITY),
 
-    ABSTRACT_INSENTIENT(LIVINGENTITY, null),
-    ENDER_DRAGON(ABSTRACT_INSENTIENT),
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
 
-    BEE(ABSTRACT_INSENTIENT),
+    // Projectiles
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+    WIND_CHARGE(PROJECTILE),
 
-    ABSTRACT_CREATURE(ABSTRACT_INSENTIENT, null),
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
 
-    ABSTRACT_AGEABLE(ABSTRACT_CREATURE, null),
-    VILLAGER(ABSTRACT_AGEABLE),
-    WANDERING_TRADER(ABSTRACT_AGEABLE),
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+    CHEST_BOAT(BOAT),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+
+    SQUID(WATER_ANIMAL),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
 
-    // Animals
     ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
     AXOLOTL(ABSTRACT_ANIMAL),
-    DOLPHIN(ABSTRACT_INSENTIENT),
     CHICKEN(ABSTRACT_ANIMAL),
-    COW(ABSTRACT_ANIMAL),
-    MOOSHROOM(COW),
-    PANDA(ABSTRACT_INSENTIENT),
+    PANDA(ABSTRACT_ANIMAL),
     PIG(ABSTRACT_ANIMAL),
     POLAR_BEAR(ABSTRACT_ANIMAL),
     RABBIT(ABSTRACT_ANIMAL),
     SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
     TURTLE(ABSTRACT_ANIMAL),
     FOX(ABSTRACT_ANIMAL),
     FROG(ABSTRACT_ANIMAL),
     GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
     SNIFFER(ABSTRACT_ANIMAL),
 
-    ABSTRACT_TAMEABLE_ANIMAL(ABSTRACT_ANIMAL, null),
-    CAT(ABSTRACT_TAMEABLE_ANIMAL),
-    OCELOT(ABSTRACT_TAMEABLE_ANIMAL),
-    WOLF(ABSTRACT_TAMEABLE_ANIMAL),
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
 
-    ABSTRACT_PARROT(ABSTRACT_TAMEABLE_ANIMAL, null),
-    PARROT(ABSTRACT_PARROT),
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
 
-    // Horses
     ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
-    CHESTED_HORSE(ABSTRACT_HORSE, null),
-    DONKEY(CHESTED_HORSE),
-    MULE(CHESTED_HORSE),
-    LLAMA(CHESTED_HORSE),
-    TRADER_LLAMA(CHESTED_HORSE),
     HORSE(ABSTRACT_HORSE),
     SKELETON_HORSE(ABSTRACT_HORSE),
     ZOMBIE_HORSE(ABSTRACT_HORSE),
     CAMEL(ABSTRACT_HORSE),
 
-    // Golem
-    ABSTRACT_GOLEM(ABSTRACT_CREATURE, null),
-    SNOW_GOLEM(ABSTRACT_GOLEM),
-    IRON_GOLEM(ABSTRACT_GOLEM),
-    SHULKER(ABSTRACT_GOLEM),
-
-    // Fish
-    ABSTRACT_FISHES(ABSTRACT_CREATURE, null),
-    COD(ABSTRACT_FISHES),
-    PUFFERFISH(ABSTRACT_FISHES),
-    SALMON(ABSTRACT_FISHES),
-    TROPICAL_FISH(ABSTRACT_FISHES),
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
 
     // Monsters
-    ABSTRACT_MONSTER(ABSTRACT_CREATURE, null),
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
     BLAZE(ABSTRACT_MONSTER),
     CREEPER(ABSTRACT_MONSTER),
     ENDERMITE(ABSTRACT_MONSTER),
@@ -127,112 +196,43 @@ public enum EntityTypes1_20_3 implements EntityType {
     GIANT(ABSTRACT_MONSTER),
     SILVERFISH(ABSTRACT_MONSTER),
     VEX(ABSTRACT_MONSTER),
-    WITCH(ABSTRACT_MONSTER),
     WITHER(ABSTRACT_MONSTER),
-    RAVAGER(ABSTRACT_MONSTER),
     BREEZE(ABSTRACT_MONSTER),
-
-    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
-
-    PIGLIN(ABSTRACT_PIGLIN),
-    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
-
-    HOGLIN(ABSTRACT_ANIMAL),
-    STRIDER(ABSTRACT_ANIMAL),
-    TADPOLE(ABSTRACT_FISHES),
     ZOGLIN(ABSTRACT_MONSTER),
     WARDEN(ABSTRACT_MONSTER),
 
-    // Illagers
-    ABSTRACT_ILLAGER_BASE(ABSTRACT_MONSTER, null),
-    ABSTRACT_EVO_ILLU_ILLAGER(ABSTRACT_ILLAGER_BASE, null),
-    EVOKER(ABSTRACT_EVO_ILLU_ILLAGER),
-    ILLUSIONER(ABSTRACT_EVO_ILLU_ILLAGER),
-    VINDICATOR(ABSTRACT_ILLAGER_BASE),
-    PILLAGER(ABSTRACT_ILLAGER_BASE),
-
-    // Skeletons
     ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
     SKELETON(ABSTRACT_SKELETON),
     STRAY(ABSTRACT_SKELETON),
     WITHER_SKELETON(ABSTRACT_SKELETON),
 
-    // Guardians
-    GUARDIAN(ABSTRACT_MONSTER),
-    ELDER_GUARDIAN(GUARDIAN),
-
-    // Spiders
-    SPIDER(ABSTRACT_MONSTER),
-    CAVE_SPIDER(SPIDER),
-
-    // Zombies
     ZOMBIE(ABSTRACT_MONSTER),
     DROWNED(ZOMBIE),
     HUSK(ZOMBIE),
     ZOMBIFIED_PIGLIN(ZOMBIE),
     ZOMBIE_VILLAGER(ZOMBIE),
 
-    // Flying entities
-    ABSTRACT_FLYING(ABSTRACT_INSENTIENT, null),
-    GHAST(ABSTRACT_FLYING),
-    PHANTOM(ABSTRACT_FLYING),
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
 
-    ABSTRACT_AMBIENT(ABSTRACT_INSENTIENT, null),
-    BAT(ABSTRACT_AMBIENT),
-    ALLAY(ABSTRACT_CREATURE),
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
 
-    ABSTRACT_WATERMOB(ABSTRACT_INSENTIENT, null),
-    SQUID(ABSTRACT_WATERMOB),
-    GLOW_SQUID(SQUID),
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
 
-    // Slimes
-    SLIME(ABSTRACT_INSENTIENT),
-    MAGMA_CUBE(SLIME),
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
 
-    // Hangable objects
-    ABSTRACT_HANGING(ENTITY, null),
-    LEASH_KNOT(ABSTRACT_HANGING),
-    ITEM_FRAME(ABSTRACT_HANGING),
-    GLOW_ITEM_FRAME(ITEM_FRAME),
-    PAINTING(ABSTRACT_HANGING),
-
-    ABSTRACT_LIGHTNING(ENTITY, null),
-    LIGHTNING_BOLT(ABSTRACT_LIGHTNING),
-
-    // Arrows
-    ABSTRACT_ARROW(ENTITY, null),
-    ARROW(ABSTRACT_ARROW),
-    SPECTRAL_ARROW(ABSTRACT_ARROW),
-    TRIDENT(ABSTRACT_ARROW),
-
-    // Fireballs
-    ABSTRACT_FIREBALL(ENTITY, null),
-    DRAGON_FIREBALL(ABSTRACT_FIREBALL),
-    FIREBALL(ABSTRACT_FIREBALL),
-    SMALL_FIREBALL(ABSTRACT_FIREBALL),
-    WITHER_SKULL(ABSTRACT_FIREBALL),
-
-    // Projectiles
-    PROJECTILE_ABSTRACT(ENTITY, null),
-    SNOWBALL(PROJECTILE_ABSTRACT),
-    ENDER_PEARL(PROJECTILE_ABSTRACT),
-    EGG(PROJECTILE_ABSTRACT),
-    POTION(PROJECTILE_ABSTRACT),
-    EXPERIENCE_BOTTLE(PROJECTILE_ABSTRACT),
-    WIND_CHARGE(PROJECTILE_ABSTRACT),
-
-    // Vehicles
-    MINECART_ABSTRACT(ENTITY, null),
-    CHESTED_MINECART_ABSTRACT(MINECART_ABSTRACT, null),
-    CHEST_MINECART(CHESTED_MINECART_ABSTRACT),
-    HOPPER_MINECART(CHESTED_MINECART_ABSTRACT),
-    MINECART(MINECART_ABSTRACT),
-    FURNACE_MINECART(MINECART_ABSTRACT),
-    COMMAND_BLOCK_MINECART(MINECART_ABSTRACT),
-    TNT_MINECART(MINECART_ABSTRACT),
-    SPAWNER_MINECART(MINECART_ABSTRACT),
-    BOAT(ENTITY),
-    CHEST_BOAT(BOAT);
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
 
     private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
     private final EntityType parent;
@@ -241,7 +241,7 @@ public enum EntityTypes1_20_3 implements EntityType {
 
     EntityTypes1_20_3(final EntityType parent) {
         this.parent = parent;
-        this.identifier = "minecraft:" + name().toLowerCase(Locale.ROOT);
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
     }
 
     EntityTypes1_20_3(final EntityType parent, @Nullable final String identifier) {

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_20_5.java

@@ -0,0 +1,289 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entities;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.util.EntityTypeUtil;
+import java.util.Locale;
+import com.viaversion.viaversion.util.Key;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public enum EntityTypes1_20_5 implements EntityType {
+
+    ENTITY(null, null),
+
+    AREA_EFFECT_CLOUD(ENTITY),
+    END_CRYSTAL(ENTITY),
+    EVOKER_FANGS(ENTITY),
+    EXPERIENCE_ORB(ENTITY),
+    EYE_OF_ENDER(ENTITY),
+    FALLING_BLOCK(ENTITY),
+    ITEM(ENTITY),
+    TNT(ENTITY),
+    OMINOUS_ITEM_SPAWNER(ENTITY),
+    MARKER(ENTITY),
+    LIGHTNING_BOLT(ENTITY),
+    INTERACTION(ENTITY),
+
+    DISPLAY(ENTITY, null),
+    BLOCK_DISPLAY(DISPLAY),
+    ITEM_DISPLAY(DISPLAY),
+    TEXT_DISPLAY(DISPLAY),
+
+    // Hanging entities
+    HANGING_ENTITY(ENTITY, null),
+    LEASH_KNOT(HANGING_ENTITY),
+    PAINTING(HANGING_ENTITY),
+    ITEM_FRAME(HANGING_ENTITY),
+    GLOW_ITEM_FRAME(ITEM_FRAME),
+
+    // Projectiles
+    PROJECTILE(ENTITY, null), // Not actually its own abstract type, but useful for categorizing
+    SNOWBALL(PROJECTILE),
+    ENDER_PEARL(PROJECTILE),
+    EGG(PROJECTILE),
+    POTION(PROJECTILE),
+    EXPERIENCE_BOTTLE(PROJECTILE),
+    FIREWORK_ROCKET(PROJECTILE),
+    LLAMA_SPIT(PROJECTILE),
+    SHULKER_BULLET(PROJECTILE),
+    FISHING_BOBBER(PROJECTILE),
+    WITHER_SKULL(PROJECTILE),
+    DRAGON_FIREBALL(PROJECTILE), // Doesn't actually inherit fireball
+
+    ABSTRACT_ARROW(PROJECTILE, null),
+    ARROW(ABSTRACT_ARROW),
+    SPECTRAL_ARROW(ABSTRACT_ARROW),
+    TRIDENT(ABSTRACT_ARROW),
+
+    ABSTRACT_FIREBALL(ENTITY, null),
+    FIREBALL(ABSTRACT_FIREBALL),
+    SMALL_FIREBALL(ABSTRACT_FIREBALL),
+
+    ABSTRACT_WIND_CHARGE(PROJECTILE, null),
+    WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+    BREEZE_WIND_CHARGE(ABSTRACT_WIND_CHARGE),
+
+    // Vehicles
+    VEHICLE(ENTITY, null),
+    BOAT(VEHICLE),
+
+    ABSTRACT_MINECART(VEHICLE, null),
+    MINECART(ABSTRACT_MINECART),
+    FURNACE_MINECART(ABSTRACT_MINECART),
+    COMMAND_BLOCK_MINECART(ABSTRACT_MINECART),
+    TNT_MINECART(ABSTRACT_MINECART),
+    SPAWNER_MINECART(ABSTRACT_MINECART),
+    CHEST_BOAT(BOAT),
+
+    ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART, null),
+    CHEST_MINECART(ABSTRACT_MINECART_CONTAINER),
+    HOPPER_MINECART(ABSTRACT_MINECART_CONTAINER),
+
+    // Living entities as a larger subclass
+    LIVING_ENTITY(ENTITY, null),
+    ARMOR_STAND(LIVING_ENTITY),
+    PLAYER(LIVING_ENTITY),
+
+    // Mobs as a larger subclass
+    MOB(LIVING_ENTITY, null),
+    ENDER_DRAGON(MOB),
+
+    SLIME(MOB),
+    MAGMA_CUBE(SLIME),
+
+    // Ambient mobs
+    AMBIENT_CREATURE(MOB, null),
+    BAT(AMBIENT_CREATURE),
+
+    // Flying mobs
+    FLYING_MOB(MOB, null),
+    GHAST(FLYING_MOB),
+    PHANTOM(FLYING_MOB),
+
+    // Pathfinder mobs and its subclasses
+    PATHFINDER_MOB(MOB, null),
+    ALLAY(PATHFINDER_MOB),
+
+    ABSTRACT_GOLEM(PATHFINDER_MOB, null),
+    SNOW_GOLEM(ABSTRACT_GOLEM),
+    IRON_GOLEM(ABSTRACT_GOLEM),
+    SHULKER(ABSTRACT_GOLEM),
+
+    // Water mobs
+    WATER_ANIMAL(PATHFINDER_MOB, null),
+    DOLPHIN(WATER_ANIMAL),
+
+    SQUID(WATER_ANIMAL),
+    GLOW_SQUID(SQUID),
+
+    ABSTRACT_FISH(WATER_ANIMAL, null),
+    PUFFERFISH(ABSTRACT_FISH),
+    TADPOLE(ABSTRACT_FISH),
+
+    ABSTRACT_SCHOOLING_FISH(ABSTRACT_FISH, null),
+    COD(ABSTRACT_SCHOOLING_FISH),
+    SALMON(ABSTRACT_SCHOOLING_FISH),
+    TROPICAL_FISH(ABSTRACT_SCHOOLING_FISH),
+
+    // Ageable mobs and (tamable) animals
+    ABSTRACT_AGEABLE(PATHFINDER_MOB, null),
+    ABSTRACT_VILLAGER(ABSTRACT_AGEABLE, null),
+    VILLAGER(ABSTRACT_VILLAGER),
+    WANDERING_TRADER(ABSTRACT_VILLAGER),
+
+    ABSTRACT_ANIMAL(ABSTRACT_AGEABLE, null),
+    AXOLOTL(ABSTRACT_ANIMAL),
+    CHICKEN(ABSTRACT_ANIMAL),
+    PANDA(ABSTRACT_ANIMAL),
+    PIG(ABSTRACT_ANIMAL),
+    POLAR_BEAR(ABSTRACT_ANIMAL),
+    RABBIT(ABSTRACT_ANIMAL),
+    SHEEP(ABSTRACT_ANIMAL),
+    BEE(ABSTRACT_ANIMAL),
+    TURTLE(ABSTRACT_ANIMAL),
+    FOX(ABSTRACT_ANIMAL),
+    FROG(ABSTRACT_ANIMAL),
+    GOAT(ABSTRACT_ANIMAL),
+    HOGLIN(ABSTRACT_ANIMAL),
+    STRIDER(ABSTRACT_ANIMAL),
+    SNIFFER(ABSTRACT_ANIMAL),
+    ARMADILLO(ABSTRACT_ANIMAL),
+
+    COW(ABSTRACT_ANIMAL),
+    MOOSHROOM(COW),
+
+    TAMABLE_ANIMAL(ABSTRACT_ANIMAL, null),
+    CAT(TAMABLE_ANIMAL),
+    OCELOT(TAMABLE_ANIMAL),
+    WOLF(TAMABLE_ANIMAL),
+    PARROT(TAMABLE_ANIMAL),
+
+    ABSTRACT_HORSE(ABSTRACT_ANIMAL, null),
+    HORSE(ABSTRACT_HORSE),
+    SKELETON_HORSE(ABSTRACT_HORSE),
+    ZOMBIE_HORSE(ABSTRACT_HORSE),
+    CAMEL(ABSTRACT_HORSE),
+
+    ABSTRACT_CHESTED_HORSE(ABSTRACT_HORSE, null),
+    DONKEY(ABSTRACT_CHESTED_HORSE),
+    MULE(ABSTRACT_CHESTED_HORSE),
+    LLAMA(ABSTRACT_CHESTED_HORSE),
+    TRADER_LLAMA(LLAMA),
+
+    // Monsters
+    ABSTRACT_MONSTER(PATHFINDER_MOB, null),
+    BLAZE(ABSTRACT_MONSTER),
+    CREEPER(ABSTRACT_MONSTER),
+    ENDERMITE(ABSTRACT_MONSTER),
+    ENDERMAN(ABSTRACT_MONSTER),
+    GIANT(ABSTRACT_MONSTER),
+    SILVERFISH(ABSTRACT_MONSTER),
+    VEX(ABSTRACT_MONSTER),
+    WITHER(ABSTRACT_MONSTER),
+    BREEZE(ABSTRACT_MONSTER),
+    ZOGLIN(ABSTRACT_MONSTER),
+    WARDEN(ABSTRACT_MONSTER),
+
+    ABSTRACT_SKELETON(ABSTRACT_MONSTER, null),
+    SKELETON(ABSTRACT_SKELETON),
+    STRAY(ABSTRACT_SKELETON),
+    WITHER_SKELETON(ABSTRACT_SKELETON),
+    BOGGED(ABSTRACT_SKELETON),
+
+    ZOMBIE(ABSTRACT_MONSTER),
+    DROWNED(ZOMBIE),
+    HUSK(ZOMBIE),
+    ZOMBIFIED_PIGLIN(ZOMBIE),
+    ZOMBIE_VILLAGER(ZOMBIE),
+
+    GUARDIAN(ABSTRACT_MONSTER),
+    ELDER_GUARDIAN(GUARDIAN),
+
+    SPIDER(ABSTRACT_MONSTER),
+    CAVE_SPIDER(SPIDER),
+
+    ABSTRACT_PIGLIN(ABSTRACT_MONSTER, null),
+    PIGLIN(ABSTRACT_PIGLIN),
+    PIGLIN_BRUTE(ABSTRACT_PIGLIN),
+
+    // Raiders
+    ABSTRACT_RAIDER(ABSTRACT_MONSTER, null),
+    WITCH(ABSTRACT_RAIDER),
+    RAVAGER(ABSTRACT_RAIDER),
+
+    ABSTRACT_ILLAGER(ABSTRACT_RAIDER, null),
+    SPELLCASTER_ILLAGER(ABSTRACT_ILLAGER, null),
+    VINDICATOR(ABSTRACT_ILLAGER),
+    PILLAGER(ABSTRACT_ILLAGER),
+    EVOKER(SPELLCASTER_ILLAGER),
+    ILLUSIONER(SPELLCASTER_ILLAGER);
+
+    private static final EntityType[] TYPES = EntityTypeUtil.createSizedArray(values());
+    private final EntityType parent;
+    private final String identifier;
+    private int id = -1;
+
+    EntityTypes1_20_5(final EntityType parent) {
+        this.parent = parent;
+        this.identifier =  Key.namespaced(name().toLowerCase(Locale.ROOT));
+    }
+
+    EntityTypes1_20_5(final EntityType parent, @Nullable final String identifier) {
+        this.parent = parent;
+        this.identifier = identifier;
+    }
+
+    @Override
+    public int getId() {
+        if (id == -1) {
+            throw new IllegalStateException("Ids have not been initialized yet (type " + name() + ")");
+        }
+        return id;
+    }
+
+    @Override
+    public String identifier() {
+        Preconditions.checkArgument(identifier != null, "Called identifier method on abstract type");
+        return identifier;
+    }
+
+    @Override
+    public @Nullable EntityType getParent() {
+        return parent;
+    }
+
+    @Override
+    public boolean isAbstractType() {
+        return identifier == null;
+    }
+
+    public static EntityType getTypeFromId(final int typeId) {
+        return EntityTypeUtil.getTypeFromId(TYPES, typeId, ENTITY);
+    }
+
+    public static void initialize(final Protocol<?, ?, ?, ?> protocol) {
+        EntityTypeUtil.initialize(values(), TYPES, protocol, (type, id) -> type.id = id);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_8.java

@@ -0,0 +1,269 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entities;
+
+import com.viaversion.viaversion.api.Via;
+import java.util.HashMap;
+import java.util.Map;
+
+public class EntityTypes1_8 {
+
+    public static EntityType getTypeFromId(final int typeId, final boolean object) {
+        EntityType type;
+
+        if (object) {
+            type = ObjectType.getEntityType(typeId);
+        } else {
+            type = EntityType.findById(typeId);
+        }
+        if (type == null) {
+            Via.getPlatform().getLogger().severe("Could not find 1.8 type id " + typeId + " objectType=" + object);
+            return EntityType.ENTITY; // Fall back to the basic ENTITY
+        }
+        return type;
+    }
+
+    public enum EntityType implements com.viaversion.viaversion.api.minecraft.entities.EntityType {
+
+        ENTITY,
+
+        END_CRYSTAL(200, ENTITY),
+        EXPERIENCE_ORB(2, ENTITY),
+        EYE_OF_ENDER(15, ENTITY),
+        FALLING_BLOCK(21, ENTITY),
+        ITEM(1, ENTITY),
+        TNT(20, ENTITY),
+        LIGHTNING_BOLT(ENTITY), // Needed for entity (un)tracking
+
+        // Hanging entities
+        HANGING_ENTITY(ENTITY),
+        LEASH_KNOT(8, HANGING_ENTITY),
+        ITEM_FRAME(18, HANGING_ENTITY),
+        PAINTING(9, HANGING_ENTITY),
+
+        // Projectiles
+        PROJECTILE(ENTITY),
+        FIREWORK_ROCKET(22, ENTITY),
+        SNOWBALL(11, PROJECTILE),
+        ENDER_PEARL(14, PROJECTILE),
+        EGG(7, PROJECTILE),
+        EXPERIENCE_BOTTLE(17, PROJECTILE),
+        POTION(16, PROJECTILE),
+        FISHING_HOOK(ENTITY),
+        ARROW(10, ENTITY),
+
+        HURTING_PROJECTILE(ENTITY),
+        FIREBALL(12, HURTING_PROJECTILE),
+        SMALL_FIREBALL(13, HURTING_PROJECTILE),
+        WITHER_SKULL(19, HURTING_PROJECTILE),
+
+        // Vehicles
+        BOAT(41, ENTITY),
+
+        ABSTRACT_MINECART(ENTITY),
+        MINECART(42, ABSTRACT_MINECART),
+        FURNACE_MINECART(44, ABSTRACT_MINECART),
+        COMMAND_BLOCK_MINECART(40, ABSTRACT_MINECART),
+        TNT_MINECART(45, ABSTRACT_MINECART),
+        SPAWNER_MINECART(47, ABSTRACT_MINECART),
+
+        ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART),
+        CHEST_MINECART(43, ABSTRACT_MINECART_CONTAINER),
+        HOPPER_MINECART(46, ABSTRACT_MINECART_CONTAINER),
+
+        LIVING_ENTITY_BASE(ENTITY),
+        ARMOR_STAND(30, LIVING_ENTITY_BASE),
+        PLAYER(LIVING_ENTITY_BASE), // Needed for entity (un)tracking and metadata indexing
+
+        // Living entities as a larger subclass
+        LIVING_ENTITY(48, LIVING_ENTITY_BASE),
+        ENDER_DRAGON(63, LIVING_ENTITY),
+        ABSTRACT_CREATURE(LIVING_ENTITY),
+        SLIME(55, LIVING_ENTITY),
+        MAGMA_CUBE(62, SLIME),
+
+        // Flying entities
+        FLYING_MOB(LIVING_ENTITY),
+        GHAST(56, FLYING_MOB),
+
+        AMBIENT_CREATURE(LIVING_ENTITY),
+        BAT(65, AMBIENT_CREATURE),
+
+        ABSTRACT_GOLEM(ABSTRACT_CREATURE),
+        SNOW_GOLEM(97, ABSTRACT_GOLEM),
+        IRON_GOLEM(99, ABSTRACT_GOLEM),
+
+        WATER_ANIMAL(LIVING_ENTITY),
+        SQUID(94, WATER_ANIMAL),
+
+        // Ageable mobs and (tamable) animals
+        ABSTRACT_AGEABLE(ABSTRACT_CREATURE),
+        VILLAGER(120, ABSTRACT_AGEABLE),
+
+        ABSTRACT_ANIMAL(ABSTRACT_AGEABLE),
+        CHICKEN(93, ABSTRACT_ANIMAL),
+        COW(92, ABSTRACT_ANIMAL),
+        MOOSHROOM(96, COW),
+        PIG(90, ABSTRACT_ANIMAL),
+        RABBIT(101, ABSTRACT_ANIMAL),
+        SHEEP(91, ABSTRACT_ANIMAL),
+        HORSE(100, ABSTRACT_ANIMAL),
+
+        TAMABLE_ANIMAL(ABSTRACT_ANIMAL),
+        OCELOT(98, TAMABLE_ANIMAL),
+        WOLF(95, TAMABLE_ANIMAL),
+
+        // Monsters
+        ABSTRACT_MONSTER(49, ABSTRACT_CREATURE),
+        BLAZE(61, ABSTRACT_MONSTER),
+        CREEPER(50, ABSTRACT_MONSTER),
+        ENDERMITE(67, ABSTRACT_MONSTER),
+        ENDERMAN(58, ABSTRACT_MONSTER),
+        GIANT(53, ABSTRACT_MONSTER),
+        SILVERFISH(60, ABSTRACT_MONSTER),
+        WITCH(66, ABSTRACT_MONSTER),
+        WITHER(64, ABSTRACT_MONSTER),
+        SKELETON(51, ABSTRACT_MONSTER),
+        ZOMBIE(54, ABSTRACT_MONSTER),
+        ZOMBIE_PIGMEN(57, ZOMBIE),
+
+        GUARDIAN(68, ABSTRACT_MONSTER),
+        SPIDER(52, ABSTRACT_MONSTER),
+        CAVE_SPIDER(59, SPIDER);
+
+        private static final Map<Integer, EntityType> TYPES = new HashMap<>();
+
+        private final int id;
+        private final EntityType parent;
+
+        EntityType() {
+            this.id = -1;
+            this.parent = null;
+        }
+
+        EntityType(EntityType parent) {
+            this.id = -1;
+            this.parent = parent;
+        }
+
+        EntityType(int id, EntityType parent) {
+            this.id = id;
+            this.parent = parent;
+        }
+
+        @Override
+        public int getId() {
+            return id;
+        }
+
+        @Override
+        public EntityType getParent() {
+            return parent;
+        }
+
+        @Override
+        public String identifier() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean isAbstractType() {
+            return id != -1;
+        }
+
+        static {
+            for (EntityType type : EntityType.values()) {
+                TYPES.put(type.id, type);
+            }
+        }
+
+        public static EntityType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
+        }
+    }
+
+    public enum ObjectType implements com.viaversion.viaversion.api.minecraft.entities.ObjectType {
+        BOAT(1, EntityType.BOAT),
+        ITEM(2, EntityType.ITEM),
+        MINECART(10, EntityType.MINECART), // There are multiple types, but we don't need them
+        TNT_PRIMED(50, EntityType.TNT),
+        ENDER_CRYSTAL(51, EntityType.END_CRYSTAL),
+        TIPPED_ARROW(60, EntityType.ARROW),
+        SNOWBALL(61, EntityType.SNOWBALL),
+        EGG(62, EntityType.EGG),
+        FIREBALL(63, EntityType.FIREBALL),
+        SMALL_FIREBALL(64, EntityType.SMALL_FIREBALL),
+        ENDER_PEARL(65, EntityType.ENDER_PEARL),
+        WITHER_SKULL(66, EntityType.WITHER_SKULL),
+        FALLING_BLOCK(70, EntityType.FALLING_BLOCK),
+        ITEM_FRAME(71, EntityType.ITEM_FRAME),
+        EYE_OF_ENDER(72, EntityType.EYE_OF_ENDER),
+        POTION(73, EntityType.POTION),
+        EXPERIENCE_BOTTLE(75, EntityType.EXPERIENCE_BOTTLE),
+        FIREWORK_ROCKET(76, EntityType.FIREWORK_ROCKET),
+        LEASH(77, EntityType.LEASH_KNOT),
+        ARMOR_STAND(78, EntityType.ARMOR_STAND),
+        FISHIHNG_HOOK(90, EntityType.FISHING_HOOK);
+
+        private static final Map<Integer, ObjectType> TYPES = new HashMap<>();
+
+        private final int id;
+        private final EntityType type;
+
+        static {
+            for (ObjectType type : ObjectType.values()) {
+                TYPES.put(type.id, type);
+            }
+        }
+
+        ObjectType(int id, EntityType type) {
+            this.id = id;
+            this.type = type;
+        }
+
+        @Override
+        public int getId() {
+            return id;
+        }
+
+        @Override
+        public EntityType getType() {
+            return type;
+        }
+
+        public static ObjectType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
+        }
+
+        public static EntityType getEntityType(final int id) {
+            final ObjectType objectType = findById(id);
+            return objectType != null ? objectType.type : null;
+        }
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entities/EntityTypes1_9.java

@@ -0,0 +1,280 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entities;
+
+import com.viaversion.viaversion.api.Via;
+import java.util.HashMap;
+import java.util.Map;
+
+public class EntityTypes1_9 {
+
+    public static EntityType getTypeFromId(final int typeId, final boolean object) {
+        EntityType type;
+
+        if (object) {
+            type = ObjectType.getEntityType(typeId);
+        } else {
+            type = EntityType.findById(typeId);
+        }
+        if (type == null) {
+            Via.getPlatform().getLogger().severe("Could not find 1.9 type id " + typeId + " objectType=" + object);
+            return EntityType.ENTITY; // Fall back to the basic ENTITY
+        }
+        return type;
+    }
+
+    public enum EntityType implements com.viaversion.viaversion.api.minecraft.entities.EntityType {
+
+        ENTITY,
+
+        AREA_EFFECT_CLOUD(3, ENTITY),
+        END_CRYSTAL(200, ENTITY),
+        EXPERIENCE_ORB(2, ENTITY),
+        EYE_OF_ENDER(15, ENTITY),
+        FALLING_BLOCK(21, ENTITY),
+        ITEM(1, ENTITY),
+        TNT(20, ENTITY),
+        LIGHTNING_BOLT(ENTITY), // Needed for entity (un)tracking
+
+        // Hanging entities
+        HANGING_ENTITY(ENTITY),
+        LEASH_KNOT(8, HANGING_ENTITY),
+        ITEM_FRAME(18, HANGING_ENTITY),
+        PAINTING(9, HANGING_ENTITY),
+
+        // Projectiles
+        PROJECTILE(ENTITY),
+        FIREWORK_ROCKET(22, ENTITY),
+        SHULKER_BULLET(25, ENTITY),
+        SNOWBALL(11, PROJECTILE),
+        ENDER_PEARL(14, PROJECTILE),
+        EGG(7, PROJECTILE),
+        EXPERIENCE_BOTTLE(17, PROJECTILE),
+        POTION(16, PROJECTILE),
+        FISHING_HOOK(ENTITY),
+
+        ABSTRACT_ARROW(ENTITY),
+        ARROW(10, ABSTRACT_ARROW),
+        SPECTRAL_ARROW(24, ABSTRACT_ARROW),
+
+        HURTING_PROJECTILE(ENTITY),
+        DRAGON_FIREBALL(26, HURTING_PROJECTILE),
+        FIREBALL(12, HURTING_PROJECTILE),
+        SMALL_FIREBALL(13, HURTING_PROJECTILE),
+        WITHER_SKULL(19, HURTING_PROJECTILE),
+
+        // Vehicles
+        BOAT(41, ENTITY),
+
+        ABSTRACT_MINECART(ENTITY),
+        MINECART(42, ABSTRACT_MINECART),
+        FURNACE_MINECART(44, ABSTRACT_MINECART),
+        COMMAND_BLOCK_MINECART(40, ABSTRACT_MINECART),
+        TNT_MINECART(45, ABSTRACT_MINECART),
+        SPAWNER_MINECART(47, ABSTRACT_MINECART),
+
+        ABSTRACT_MINECART_CONTAINER(ABSTRACT_MINECART),
+        CHEST_MINECART(43, ABSTRACT_MINECART_CONTAINER),
+        HOPPER_MINECART(46, ABSTRACT_MINECART_CONTAINER),
+
+        LIVING_ENTITY_BASE(ENTITY),
+        ARMOR_STAND(30, LIVING_ENTITY_BASE),
+        PLAYER(ENTITY), // Needed for entity (un)tracking
+
+        // Living entities as a larger subclass
+        LIVING_ENTITY(48, LIVING_ENTITY_BASE),
+        ENDER_DRAGON(63, LIVING_ENTITY),
+        ABSTRACT_CREATURE(LIVING_ENTITY),
+        SLIME(55, LIVING_ENTITY),
+        MAGMA_CUBE(62, SLIME),
+
+        // Flying entities
+        FLYING_MOB(LIVING_ENTITY),
+        GHAST(56, FLYING_MOB),
+
+        AMBIENT_CREATURE(LIVING_ENTITY),
+        BAT(65, AMBIENT_CREATURE),
+
+        ABSTRACT_GOLEM(ABSTRACT_CREATURE),
+        SNOW_GOLEM(97, ABSTRACT_GOLEM),
+        IRON_GOLEM(99, ABSTRACT_GOLEM),
+        SHULKER(69, ABSTRACT_GOLEM),
+
+        WATER_ANIMAL(LIVING_ENTITY),
+        SQUID(94, WATER_ANIMAL),
+
+        // Ageable mobs and (tamable) animals
+        ABSTRACT_AGEABLE(ABSTRACT_CREATURE),
+        VILLAGER(120, ABSTRACT_AGEABLE),
+
+        ABSTRACT_ANIMAL(ABSTRACT_AGEABLE),
+        CHICKEN(93, ABSTRACT_ANIMAL),
+        COW(92, ABSTRACT_ANIMAL),
+        MOOSHROOM(96, COW),
+        PIG(90, ABSTRACT_ANIMAL),
+        RABBIT(101, ABSTRACT_ANIMAL),
+        SHEEP(91, ABSTRACT_ANIMAL),
+        HORSE(100, ABSTRACT_ANIMAL),
+
+        TAMABLE_ANIMAL(ABSTRACT_ANIMAL),
+        OCELOT(98, TAMABLE_ANIMAL),
+        WOLF(95, TAMABLE_ANIMAL),
+
+        // Monsters
+        ABSTRACT_MONSTER(49, ABSTRACT_CREATURE),
+        BLAZE(61, ABSTRACT_MONSTER),
+        CREEPER(50, ABSTRACT_MONSTER),
+        ENDERMITE(67, ABSTRACT_MONSTER),
+        ENDERMAN(58, ABSTRACT_MONSTER),
+        GIANT(53, ABSTRACT_MONSTER),
+        SILVERFISH(60, ABSTRACT_MONSTER),
+        WITCH(66, ABSTRACT_MONSTER),
+        WITHER(64, ABSTRACT_MONSTER),
+        SKELETON(51, ABSTRACT_MONSTER),
+        ZOMBIE(54, ABSTRACT_MONSTER),
+        ZOMBIE_PIGMEN(57, ZOMBIE),
+
+        GUARDIAN(68, ABSTRACT_MONSTER),
+        SPIDER(52, ABSTRACT_MONSTER),
+        CAVE_SPIDER(59, SPIDER);
+
+        private static final Map<Integer, EntityType> TYPES = new HashMap<>();
+
+        private final int id;
+        private final EntityType parent;
+
+        EntityType() {
+            this.id = -1;
+            this.parent = null;
+        }
+
+        EntityType(EntityType parent) {
+            this.id = -1;
+            this.parent = parent;
+        }
+
+        EntityType(int id, EntityType parent) {
+            this.id = id;
+            this.parent = parent;
+        }
+
+        @Override
+        public int getId() {
+            return id;
+        }
+
+        @Override
+        public EntityType getParent() {
+            return parent;
+        }
+
+        @Override
+        public String identifier() {
+            throw new UnsupportedOperationException();
+        }
+
+        @Override
+        public boolean isAbstractType() {
+            return id != -1;
+        }
+
+        static {
+            for (EntityType type : EntityType.values()) {
+                TYPES.put(type.id, type);
+            }
+        }
+
+        public static EntityType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
+        }
+    }
+
+    public enum ObjectType implements com.viaversion.viaversion.api.minecraft.entities.ObjectType {
+        BOAT(1, EntityType.BOAT),
+        ITEM(2, EntityType.ITEM),
+        AREA_EFFECT_CLOUD(3, EntityType.AREA_EFFECT_CLOUD),
+        MINECART(10, EntityType.MINECART), // There are multiple types, but we don't need them
+        TNT_PRIMED(50, EntityType.TNT),
+        ENDER_CRYSTAL(51, EntityType.END_CRYSTAL),
+        TIPPED_ARROW(60, EntityType.ARROW),
+        SNOWBALL(61, EntityType.SNOWBALL),
+        EGG(62, EntityType.EGG),
+        FIREBALL(63, EntityType.FIREBALL),
+        SMALL_FIREBALL(64, EntityType.SMALL_FIREBALL),
+        ENDER_PEARL(65, EntityType.ENDER_PEARL),
+        WITHER_SKULL(66, EntityType.WITHER_SKULL),
+        SHULKER_BULLET(67, EntityType.SHULKER_BULLET),
+        FALLING_BLOCK(70, EntityType.FALLING_BLOCK),
+        ITEM_FRAME(71, EntityType.ITEM_FRAME),
+        EYE_OF_ENDER(72, EntityType.EYE_OF_ENDER),
+        POTION(73, EntityType.POTION),
+        EXPERIENCE_BOTTLE(75, EntityType.EXPERIENCE_BOTTLE),
+        FIREWORK_ROCKET(76, EntityType.FIREWORK_ROCKET),
+        LEASH(77, EntityType.LEASH_KNOT),
+        ARMOR_STAND(78, EntityType.ARMOR_STAND),
+        FISHIHNG_HOOK(90, EntityType.FISHING_HOOK),
+        SPECTRAL_ARROW(91, EntityType.SPECTRAL_ARROW),
+        DRAGON_FIREBALL(93, EntityType.DRAGON_FIREBALL);
+
+        private static final Map<Integer, ObjectType> TYPES = new HashMap<>();
+
+        private final int id;
+        private final EntityType type;
+
+        static {
+            for (ObjectType type : ObjectType.values()) {
+                TYPES.put(type.id, type);
+            }
+        }
+
+        ObjectType(int id, EntityType type) {
+            this.id = id;
+            this.type = type;
+        }
+
+        @Override
+        public int getId() {
+            return id;
+        }
+
+        @Override
+        public EntityType getType() {
+            return type;
+        }
+
+        public static ObjectType findById(final int id) {
+            if (id == -1) {
+                return null;
+            }
+            return TYPES.get(id);
+        }
+
+        public static EntityType getEntityType(final int id) {
+            final ObjectType objectType = findById(id);
+            return objectType != null ? objectType.type : null;
+        }
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/EntityData.java

@@ -20,15 +20,15 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata;
+package com.viaversion.viaversion.api.minecraft.entitydata;
 
 import com.google.common.base.Preconditions;
 import java.util.Objects;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public final class Metadata {
+public final class EntityData {
     private int id;
-    private MetaType metaType;
+    private EntityDataType metaType;
     private Object value;
 
     /**
@@ -39,7 +39,7 @@ public final class Metadata {
      * @param value    value if present
      * @throws IllegalArgumentException if the value and metaType are incompatible
      */
-    public Metadata(int id, MetaType metaType, @Nullable Object value) {
+    public EntityData(int id, EntityDataType metaType, @Nullable Object value) {
         this.id = id;
         this.metaType = metaType;
         this.value = checkValue(metaType, value);
@@ -53,7 +53,7 @@ public final class Metadata {
         this.id = id;
     }
 
-    public MetaType metaType() {
+    public EntityDataType dataType() {
         return metaType;
     }
 
@@ -62,9 +62,9 @@ public final class Metadata {
      *
      * @param metaType metadata type
      * @throws IllegalArgumentException if the metadata type and current value are incompatible
-     * @see #setTypeAndValue(MetaType, Object)
+     * @see #setTypeAndValue(EntityDataType, Object)
      */
-    public void setMetaType(MetaType metaType) {
+    public void setDataType(EntityDataType metaType) {
         checkValue(metaType, this.value);
         this.metaType = metaType;
     }
@@ -82,7 +82,7 @@ public final class Metadata {
      *
      * @param value value
      * @throws IllegalArgumentException if the value and current metaType are incompatible
-     * @see #setTypeAndValue(MetaType, Object)
+     * @see #setTypeAndValue(EntityDataType, Object)
      */
     public void setValue(@Nullable Object value) {
         this.value = checkValue(this.metaType, value);
@@ -95,22 +95,22 @@ public final class Metadata {
      * @param value    value
      * @throws IllegalArgumentException if the value and metaType are incompatible
      */
-    public void setTypeAndValue(MetaType metaType, @Nullable Object value) {
+    public void setTypeAndValue(EntityDataType metaType, @Nullable Object value) {
         this.value = checkValue(metaType, value);
         this.metaType = metaType;
     }
 
-    private Object checkValue(MetaType metaType, @Nullable Object value) {
+    private Object checkValue(EntityDataType metaType, @Nullable Object value) {
         Preconditions.checkNotNull(metaType);
         if (value != null && !metaType.type().getOutputClass().isAssignableFrom(value.getClass())) {
             throw new IllegalArgumentException("Metadata value and metaType are incompatible. Type=" + metaType
-                    + ", value=" + value + " (" + value.getClass().getSimpleName() + ")");
+                + ", value=" + value + " (" + value.getClass().getSimpleName() + ")");
         }
         return value;
     }
 
     @Deprecated
-    public void setMetaTypeUnsafe(MetaType type) {
+    public void setDataTypeUnsafe(EntityDataType type) {
         this.metaType = type;
     }
 
@@ -118,7 +118,7 @@ public final class Metadata {
     public boolean equals(final Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
-        Metadata metadata = (Metadata) o;
+        EntityData metadata = (EntityData) o;
         if (id != metadata.id) return false;
         if (metaType != metadata.metaType) return false;
         return Objects.equals(value, metadata.value);
@@ -135,9 +135,9 @@ public final class Metadata {
     @Override
     public String toString() {
         return "Metadata{" +
-                "id=" + id +
-                ", metaType=" + metaType +
-                ", value=" + value +
-                '}';
+            "id=" + id +
+            ", metaType=" + metaType +
+            ", value=" + value +
+            '}';
     }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/EntityDataType.java

@@ -20,11 +20,12 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata;
+package com.viaversion.viaversion.api.minecraft.entitydata;
 
+import com.google.common.base.Preconditions;
 import com.viaversion.viaversion.api.type.Type;
 
-public interface MetaType {
+public interface EntityDataType {
 
     /**
      * Get the write/read type
@@ -40,15 +41,16 @@ public interface MetaType {
      */
     int typeId();
 
-    static MetaType create(final int typeId, final Type<?> type) {
-        return new MetaTypeImpl(typeId, type);
+    static EntityDataType create(final int typeId, final Type<?> type) {
+        return new EntityDataTypeImpl(typeId, type);
     }
 
-    final class MetaTypeImpl implements MetaType {
+    final class EntityDataTypeImpl implements EntityDataType {
         private final int typeId;
         private final Type<?> type;
 
-        MetaTypeImpl(final int typeId, final Type<?> type) {
+        EntityDataTypeImpl(final int typeId, final Type<?> type) {
+            Preconditions.checkNotNull(type);
             this.typeId = typeId;
             this.type = type;
         }
@@ -65,17 +67,17 @@ public interface MetaType {
 
         @Override
         public String toString() {
-            return "MetaType{" +
-                    "typeId=" + typeId +
-                    ", type=" + type +
-                    '}';
+            return "EntityDataType{" +
+                "typeId=" + typeId +
+                ", type=" + type +
+                '}';
         }
 
         @Override
         public boolean equals(final Object o) {
             if (this == o) return true;
             if (o == null || getClass() != o.getClass()) return false;
-            final MetaTypeImpl metaType = (MetaTypeImpl) o;
+            final EntityDataTypeImpl metaType = (EntityDataTypeImpl) o;
             if (typeId != metaType.typeId) return false;
             return type.equals(metaType.type);
         }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/AbstractEntityDataTypes.java

@@ -20,31 +20,31 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata.types;
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
 
-import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
 import com.viaversion.viaversion.api.type.Type;
 
-public abstract class AbstractMetaTypes implements MetaTypes {
+public abstract class AbstractEntityDataTypes implements EntityDataTypes {
 
-    private final MetaType[] values;
+    private final EntityDataType[] values;
 
-    protected AbstractMetaTypes(final int values) {
-        this.values = new MetaType[values];
+    protected AbstractEntityDataTypes(final int values) {
+        this.values = new EntityDataType[values];
     }
 
     @Override
-    public MetaType byId(final int id) {
+    public EntityDataType byId(final int id) {
         return values[id];
     }
 
     @Override
-    public MetaType[] values() {
+    public EntityDataType[] values() {
         return values;
     }
 
-    protected MetaType add(final int typeId, final Type<?> type) {
-        final MetaType metaType = MetaType.create(typeId, type);
+    protected EntityDataType add(final int typeId, final Type<?> type) {
+        final EntityDataType metaType = EntityDataType.create(typeId, type);
         values[typeId] = metaType;
         return metaType;
     }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes.java

@@ -20,11 +20,11 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata.types;
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
 
-import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
 
-public interface MetaTypes {
+public interface EntityDataTypes {
 
     /**
      * Returns the meta type by the given id.
@@ -33,12 +33,12 @@ public interface MetaTypes {
      * @return meta type by id
      * @throws IndexOutOfBoundsException if id is out of bounds
      */
-    MetaType byId(int id);
+    EntityDataType byId(int id);
 
     /**
      * Returns an array of meta types.
      *
      * @return array of meta types
      */
-    MetaType[] values();
+    EntityDataType[] values();
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_12.java

@@ -20,41 +20,41 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata.types;
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
 
-import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
 import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
 
-public enum MetaType1_9 implements MetaType {
-    Byte(0, Type.BYTE),
-    VarInt(1, Type.VAR_INT),
-    Float(2, Type.FLOAT),
-    String(3, Type.STRING),
-    Chat(4, Type.COMPONENT),
-    Slot(5, Type.ITEM1_8),
-    Boolean(6, Type.BOOLEAN),
-    Vector3F(7, Type.ROTATION),
-    Position(8, Type.POSITION1_8),
-    OptPosition(9, Type.OPTIONAL_POSITION1_8),
-    Direction(10, Type.VAR_INT),
-    OptUUID(11, Type.OPTIONAL_UUID),
-    BlockID(12, Type.VAR_INT);
+public enum EntityDataTypes1_12 implements EntityDataType {
+    BYTE(Types.BYTE),
+    VAR_INT(Types.VAR_INT),
+    FLOAT(Types.FLOAT),
+    STRING(Types.STRING),
+    COMPONENT(Types.COMPONENT),
+    ITEM(Types.ITEM1_8),
+    BOOLEAN(Types.BOOLEAN),
+    ROTATIONS(Types.ROTATIONS),
+    BLOCK_POSITION(Types.BLOCK_POSITION1_8),
+    OPTIONAL_BLOCK_POSITION(Types.OPTIONAL_POSITION1_8),
+    DIRECTION(Types.VAR_INT),
+    OPTIONAL_UUID(Types.OPTIONAL_UUID),
+    OPTIONAL_BLOCK_STATE(Types.VAR_INT),
+    COMPOUND_TAG(Types.NAMED_COMPOUND_TAG);
 
-    private final int typeID;
-    private final Type type;
+    private final Type<?> type;
 
-    MetaType1_9(int typeID, Type type) {
-        this.typeID = typeID;
+    EntityDataTypes1_12(Type<?> type) {
         this.type = type;
     }
 
-    public static MetaType1_9 byId(int id) {
+    public static EntityDataTypes1_12 byId(int id) {
         return values()[id];
     }
 
     @Override
     public int typeId() {
-        return typeID;
+        return ordinal();
     }
 
     @Override

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_13.java

@@ -0,0 +1,52 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_13 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType floatType = add(2, Types.FLOAT);
+    public final EntityDataType stringType = add(3, Types.STRING);
+    public final EntityDataType componentType = add(4, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(5, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(6, Types.ITEM1_13);
+    public final EntityDataType booleanType = add(7, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(8, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(9, Types.BLOCK_POSITION1_8);
+    public final EntityDataType optionalBlockPositionType = add(10, Types.OPTIONAL_POSITION1_8);
+    public final EntityDataType directionType = add(11, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(12, Types.OPTIONAL_UUID);
+    public final EntityDataType optionalBlockStateType = add(13, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(14, Types.NAMED_COMPOUND_TAG);
+    public final EntityDataType particleType;
+
+    public EntityDataTypes1_13(final ParticleType particleType) {
+        super(16);
+        this.particleType = add(15, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_13_2.java

@@ -0,0 +1,52 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_13_2 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType floatType = add(2, Types.FLOAT);
+    public final EntityDataType stringType = add(3, Types.STRING);
+    public final EntityDataType componentType = add(4, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(5, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(6, Types.ITEM1_13_2);
+    public final EntityDataType booleanType = add(7, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(8, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(9, Types.BLOCK_POSITION1_8);
+    public final EntityDataType optionalBlockPositionType = add(10, Types.OPTIONAL_POSITION1_8);
+    public final EntityDataType directionType = add(11, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(12, Types.OPTIONAL_UUID);
+    public final EntityDataType optionalBlockStateType = add(13, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(14, Types.NAMED_COMPOUND_TAG);
+    public final EntityDataType particleType;
+
+    public EntityDataTypes1_13_2(final ParticleType particleType) {
+        super(16);
+        this.particleType = add(15, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_14.java

@@ -0,0 +1,55 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_14 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType floatType = add(2, Types.FLOAT);
+    public final EntityDataType stringType = add(3, Types.STRING);
+    public final EntityDataType componentType = add(4, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(5, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(6, Types.ITEM1_13_2);
+    public final EntityDataType booleanType = add(7, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(8, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(9, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(10, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(11, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(12, Types.OPTIONAL_UUID);
+    public final EntityDataType optionalBlockStateType = add(13, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(14, Types.NAMED_COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType villagerDatatType = add(16, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(17, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(18, Types.VAR_INT);
+
+    public EntityDataTypes1_14(final ParticleType particleType) {
+        super(19);
+        this.particleType = add(15, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_19.java

@@ -0,0 +1,59 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_19 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType floatType = add(2, Types.FLOAT);
+    public final EntityDataType stringType = add(3, Types.STRING);
+    public final EntityDataType componentType = add(4, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(5, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(6, Types.ITEM1_13_2);
+    public final EntityDataType booleanType = add(7, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(8, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(9, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(10, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(11, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(12, Types.OPTIONAL_UUID);
+    public final EntityDataType optionalBlockStateType = add(13, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(14, Types.NAMED_COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType villagerDatatType = add(16, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(17, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(18, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(19, Types.VAR_INT);
+    public final EntityDataType frogVariantType = add(20, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(21, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(22, Types.VAR_INT);
+
+    public EntityDataTypes1_19(final ParticleType particleType) {
+        super(23);
+        this.particleType = add(15, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_19_3.java

@@ -0,0 +1,60 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_19_3 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(7, Types.ITEM1_13_2);
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType optionalBlockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(15, Types.NAMED_COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType villagerDatatType = add(17, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(18, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(19, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(20, Types.VAR_INT);
+    public final EntityDataType frogVariantType = add(21, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(22, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(23, Types.VAR_INT);
+
+    public EntityDataTypes1_19_3(final ParticleType particleType) {
+        super(24);
+        this.particleType = add(16, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_19_4.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_19_4 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(7, Types.ITEM1_13_2);
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType blockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType optionalBlockStateType = add(15, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(16, Types.NAMED_COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType villagerDatatType = add(18, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(19, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(20, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(21, Types.VAR_INT);
+    public final EntityDataType frogVariantType = add(22, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(23, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(24, Types.VAR_INT);
+    public final EntityDataType snifferState = add(25, Types.VAR_INT);
+    public final EntityDataType vector3FType = add(26, Types.VECTOR3F);
+    public final EntityDataType quaternionType = add(27, Types.QUATERNION);
+
+    public EntityDataTypes1_19_4(final ParticleType particleType) {
+        super(28);
+        this.particleType = add(17, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_20_2.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_20_2 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.COMPONENT);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_COMPONENT);
+    public final EntityDataType itemType = add(7, Types.ITEM1_20_2);
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType blockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType optionalBlockStateType = add(15, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(16, Types.COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType villagerDatatType = add(18, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(19, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(20, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(21, Types.VAR_INT);
+    public final EntityDataType frogVariantType = add(22, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(23, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(24, Types.VAR_INT);
+    public final EntityDataType snifferState = add(25, Types.VAR_INT);
+    public final EntityDataType vector3FType = add(26, Types.VECTOR3F);
+    public final EntityDataType quaternionType = add(27, Types.QUATERNION);
+
+    public EntityDataTypes1_20_2(final ParticleType particleType) {
+        super(28);
+        this.particleType = add(17, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_20_3.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+
+public final class EntityDataTypes1_20_3 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.TAG);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_TAG);
+    public final EntityDataType itemType = add(7, Types.ITEM1_20_2);
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType blockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType optionalBlockStateType = add(15, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(16, Types.COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType villagerDatatType = add(18, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(19, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(20, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(21, Types.VAR_INT);
+    public final EntityDataType frogVariantType = add(22, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(23, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(24, Types.VAR_INT);
+    public final EntityDataType snifferState = add(25, Types.VAR_INT);
+    public final EntityDataType vector3FType = add(26, Types.VECTOR3F);
+    public final EntityDataType quaternionType = add(27, Types.QUATERNION);
+
+    public EntityDataTypes1_20_3(final ParticleType particleType) {
+        super(28);
+        this.particleType = add(17, particleType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_20_5.java

@@ -0,0 +1,71 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.entitydata.types;
+
+import com.viaversion.viaversion.api.minecraft.Particle;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
+import com.viaversion.viaversion.api.type.Types;
+import com.viaversion.viaversion.api.type.types.ArrayType;
+import com.viaversion.viaversion.api.type.types.misc.ParticleType;
+import com.viaversion.viaversion.api.type.types.version.Types1_20_5;
+
+public final class EntityDataTypes1_20_5 extends AbstractEntityDataTypes {
+
+    public final EntityDataType byteType = add(0, Types.BYTE);
+    public final EntityDataType varIntType = add(1, Types.VAR_INT);
+    public final EntityDataType longType = add(2, Types.VAR_LONG);
+    public final EntityDataType floatType = add(3, Types.FLOAT);
+    public final EntityDataType stringType = add(4, Types.STRING);
+    public final EntityDataType componentType = add(5, Types.TAG);
+    public final EntityDataType optionalComponentType = add(6, Types.OPTIONAL_TAG);
+    public final EntityDataType itemType = add(7, Types1_20_5.ITEM);
+    public final EntityDataType booleanType = add(8, Types.BOOLEAN);
+    public final EntityDataType rotationsType = add(9, Types.ROTATIONS);
+    public final EntityDataType blockPositionType = add(10, Types.BLOCK_POSITION1_14);
+    public final EntityDataType optionalBlockPositionType = add(11, Types.OPTIONAL_POSITION_1_14);
+    public final EntityDataType directionType = add(12, Types.VAR_INT);
+    public final EntityDataType optionalUUIDType = add(13, Types.OPTIONAL_UUID);
+    public final EntityDataType blockStateType = add(14, Types.VAR_INT);
+    public final EntityDataType optionalBlockStateType = add(15, Types.VAR_INT);
+    public final EntityDataType compoundTagType = add(16, Types.COMPOUND_TAG);
+    public final EntityDataType particleType;
+    public final EntityDataType particlesType;
+    public final EntityDataType villagerDatatType = add(19, Types.VILLAGER_DATA);
+    public final EntityDataType optionalVarIntType = add(20, Types.OPTIONAL_VAR_INT);
+    public final EntityDataType poseType = add(21, Types.VAR_INT);
+    public final EntityDataType catVariantType = add(22, Types.VAR_INT);
+    public final EntityDataType wolfVariantType = add(23, Types.VAR_INT);
+    public final EntityDataType frogVariantType = add(24, Types.VAR_INT);
+    public final EntityDataType optionalGlobalPosition = add(25, Types.OPTIONAL_GLOBAL_POSITION);
+    public final EntityDataType paintingVariantType = add(26, Types.VAR_INT);
+    public final EntityDataType snifferState = add(27, Types.VAR_INT);
+    public final EntityDataType armadilloState = add(28, Types.VAR_INT);
+    public final EntityDataType vector3FType = add(29, Types.VECTOR3F);
+    public final EntityDataType quaternionType = add(30, Types.QUATERNION);
+
+    public EntityDataTypes1_20_5(final ParticleType particleType, final ArrayType<Particle> particlesType) {
+        super(31);
+        this.particleType = add(17, particleType);
+        this.particlesType = add(18, particlesType);
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_8.java

@@ -20,39 +20,35 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata.types;
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
 
-import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
 import com.viaversion.viaversion.api.type.Type;
-import com.viaversion.viaversion.api.type.types.VoidType;
+import com.viaversion.viaversion.api.type.Types;
 
-public enum MetaType1_8 implements MetaType {
-    Byte(0, Type.BYTE),
-    Short(1, Type.SHORT),
-    Int(2, Type.INT),
-    Float(3, Type.FLOAT),
-    String(4, Type.STRING),
-    Slot(5, Type.ITEM1_8),
-    Position(6, Type.VECTOR),
-    Rotation(7, Type.ROTATION),
-    @Deprecated
-    NonExistent(-1, new VoidType());
+public enum EntityDataTypes1_8 implements EntityDataType {
+    BYTE(Types.BYTE),
+    SHORT(Types.SHORT),
+    INT(Types.INT),
+    FLOAT(Types.FLOAT),
+    STRING(Types.STRING),
+    ITEM(Types.ITEM1_8),
+    BLOCK_POSITION(Types.VECTOR),
+    ROTATIONS(Types.ROTATIONS);
 
-    private final int typeID;
-    private final Type type;
+    private final Type<?> type;
 
-    MetaType1_8(int typeID, Type type) {
-        this.typeID = typeID;
+    EntityDataTypes1_8(Type<?> type) {
         this.type = type;
     }
 
-    public static MetaType1_8 byId(int id) {
+    public static EntityDataTypes1_8 byId(int id) {
         return values()[id];
     }
 
     @Override
     public int typeId() {
-        return typeID;
+        return ordinal();
     }
 
     @Override

api/src/main/java/com/viaversion/viaversion/api/minecraft/entitydata/types/EntityDataTypes1_9.java

@@ -20,42 +20,40 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-package com.viaversion.viaversion.api.minecraft.metadata.types;
+package com.viaversion.viaversion.api.minecraft.entitydata.types;
 
-import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.entitydata.EntityDataType;
 import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.Types;
 
-public enum MetaType1_12 implements MetaType {
-    Byte(0, Type.BYTE),
-    VarInt(1, Type.VAR_INT),
-    Float(2, Type.FLOAT),
-    String(3, Type.STRING),
-    Chat(4, Type.COMPONENT),
-    Slot(5, Type.ITEM1_8),
-    Boolean(6, Type.BOOLEAN),
-    Vector3F(7, Type.ROTATION),
-    Position(8, Type.POSITION1_8),
-    OptPosition(9, Type.OPTIONAL_POSITION1_8),
-    Direction(10, Type.VAR_INT),
-    OptUUID(11, Type.OPTIONAL_UUID),
-    BlockID(12, Type.VAR_INT),
-    NBTTag(13, Type.NAMED_COMPOUND_TAG);
+public enum EntityDataTypes1_9 implements EntityDataType {
+    BYTE(Types.BYTE),
+    VAR_INT(Types.VAR_INT),
+    FLOAT(Types.FLOAT),
+    STRING(Types.STRING),
+    COMPONENT(Types.COMPONENT),
+    ITEM(Types.ITEM1_8),
+    BOOLEAN(Types.BOOLEAN),
+    ROTATIONS(Types.ROTATIONS),
+    BLOCK_POSITION(Types.BLOCK_POSITION1_8),
+    OPTIONAL_BLOCK_POSITION(Types.OPTIONAL_POSITION1_8),
+    DIRECTION(Types.VAR_INT),
+    OPTIONAL_UUID(Types.OPTIONAL_UUID),
+    OPTIONAL_BLOCK_STATE(Types.VAR_INT);
 
-    private final int typeID;
-    private final Type type;
+    private final Type<?> type;
 
-    MetaType1_12(int typeID, Type type) {
-        this.typeID = typeID;
+    EntityDataTypes1_9(Type<?> type) {
         this.type = type;
     }
 
-    public static MetaType1_12 byId(int id) {
+    public static EntityDataTypes1_9 byId(int id) {
         return values()[id];
     }
 
     @Override
     public int typeId() {
-        return typeID;
+        return ordinal();
     }
 
     @Override

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/DataItem.java

@@ -22,8 +22,9 @@
  */
 package com.viaversion.viaversion.api.minecraft.item;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
 import com.google.gson.annotations.SerializedName;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
 import java.util.Objects;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
@@ -37,6 +38,10 @@ public class DataItem implements Item {
     public DataItem() {
     }
 
+    public DataItem(int identifier, byte amount, @Nullable CompoundTag tag) {
+        this(identifier, amount, (short) 0, tag);
+    }
+
     public DataItem(int identifier, byte amount, short data, @Nullable CompoundTag tag) {
         this.identifier = identifier;
         this.amount = amount;
@@ -44,10 +49,6 @@ public class DataItem implements Item {
         this.tag = tag;
     }
 
-    public DataItem(Item toCopy) {
-        this(toCopy.identifier(), (byte) toCopy.amount(), toCopy.data(), toCopy.tag());
-    }
-
     @Override
     public int identifier() {
         return identifier;
@@ -65,7 +66,7 @@ public class DataItem implements Item {
 
     @Override
     public void setAmount(int amount) {
-        if (amount > Byte.MAX_VALUE || amount < Byte.MIN_VALUE) {
+        if (amount != (byte) amount) {
             throw new IllegalArgumentException("Invalid item amount: " + amount);
         }
         this.amount = (byte) amount;
@@ -92,8 +93,13 @@ public class DataItem implements Item {
     }
 
     @Override
-    public Item copy() {
-        return new DataItem(identifier, amount, data, tag);
+    public StructuredDataContainer dataContainer() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public DataItem copy() {
+        return new DataItem(identifier, amount, data, tag != null ? tag.copy() : null);
     }
 
     @Override
@@ -110,8 +116,8 @@ public class DataItem implements Item {
     @Override
     public int hashCode() {
         int result = identifier;
-        result = 31 * result + (int) amount;
-        result = 31 * result + (int) data;
+        result = 31 * result + amount;
+        result = 31 * result + data;
         result = 31 * result + (tag != null ? tag.hashCode() : 0);
         return result;
     }
@@ -119,10 +125,10 @@ public class DataItem implements Item {
     @Override
     public String toString() {
         return "Item{" +
-                "identifier=" + identifier +
-                ", amount=" + amount +
-                ", data=" + data +
-                ", tag=" + tag +
-                '}';
+            "identifier=" + identifier +
+            ", amount=" + amount +
+            ", data=" + data +
+            ", tag=" + tag +
+            '}';
     }
-}
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/Item.java

@@ -22,7 +22,8 @@
  */
 package com.viaversion.viaversion.api.minecraft.item;
 
-import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface Item {
@@ -79,7 +80,8 @@ public interface Item {
      *
      * @return item tag
      */
-    @Nullable CompoundTag tag();
+    @Nullable
+    CompoundTag tag();
 
     /**
      * Sets the item compound tag.
@@ -88,10 +90,26 @@ public interface Item {
      */
     void setTag(@Nullable CompoundTag tag);
 
+    /**
+     * Returns the data container for item data components.
+     *
+     * @return the data container
+     */
+    StructuredDataContainer dataContainer();
+
     /**
      * Returns a copy of the item.
      *
      * @return copy of the item
      */
     Item copy();
+
+    /**
+     * Returns true if the item is empty.
+     *
+     * @return true if the item is empty
+     */
+    default boolean isEmpty() {
+        return identifier() == 0 || amount() <= 0;
+    }
 }

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/StructuredItem.java

@@ -0,0 +1,123 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.item;
+
+import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class StructuredItem implements Item {
+    private final StructuredDataContainer data;
+    private int identifier;
+    private int amount;
+
+    public StructuredItem(final int identifier, final int amount) {
+        this(identifier, amount, new StructuredDataContainer());
+    }
+
+    public StructuredItem(final int identifier, final int amount, final StructuredDataContainer data) {
+        this.identifier = identifier;
+        this.amount = amount;
+        this.data = data;
+    }
+
+    public static StructuredItem empty() {
+        // Data is mutable, create a new item
+        return new StructuredItem(0, 0);
+    }
+
+    public static StructuredItem[] emptyArray(final int size) {
+        final StructuredItem[] items = new StructuredItem[size];
+        for (int i = 0; i < items.length; i++) {
+            items[i] = empty();
+        }
+        return items;
+    }
+
+    @Override
+    public int identifier() {
+        return identifier;
+    }
+
+    @Override
+    public void setIdentifier(final int identifier) {
+        this.identifier = identifier;
+    }
+
+    @Override
+    public int amount() {
+        return amount;
+    }
+
+    @Override
+    public void setAmount(final int amount) {
+        this.amount = amount;
+    }
+
+    @Override
+    public @Nullable CompoundTag tag() {
+        return null;
+    }
+
+    @Override
+    public void setTag(@Nullable final CompoundTag tag) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public StructuredDataContainer dataContainer() {
+        return data;
+    }
+
+    @Override
+    public StructuredItem copy() {
+        return new StructuredItem(identifier, amount, data.copy());
+    }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        final StructuredItem that = (StructuredItem) o;
+        if (identifier != that.identifier) return false;
+        if (amount != that.amount) return false;
+        return data.equals(that.data);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = data.hashCode();
+        result = 31 * result + identifier;
+        result = 31 * result + amount;
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "StructuredItem{" +
+            "data=" + data +
+            ", identifier=" + identifier +
+            ", amount=" + amount +
+            '}';
+    }
+}

api/src/main/java/com/viaversion/viaversion/api/minecraft/item/data/AdventureModePredicate.java

@@ -0,0 +1,45 @@
+/*
+ * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
+ * Copyright (C) 2016-2024 ViaVersion and contributors
+ *
+ * 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 com.viaversion.viaversion.api.minecraft.item.data;
+
+import com.viaversion.viaversion.api.type.Type;
+import io.netty.buffer.ByteBuf;
+
+public record AdventureModePredicate(BlockPredicate[] predicates, boolean showInTooltip) {
+
+    public static final Type<AdventureModePredicate> TYPE = new Type<>(AdventureModePredicate.class) {
+        @Override
+        public AdventureModePredicate read(final ByteBuf buffer) {
+            final BlockPredicate[] predicates = BlockPredicate.ARRAY_TYPE.read(buffer);
+            final boolean showInTooltip = buffer.readBoolean();
+            return new AdventureModePredicate(predicates, showInTooltip);
+        }
+
+        @Override
+        public void write(final ByteBuf buffer, final AdventureModePredicate value) {
+            BlockPredicate.ARRAY_TYPE.write(buffer, value.predicates);
+            buffer.writeBoolean(value.showInTooltip);
+        }
+    };
+
+}