diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/Data.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/Data.java
deleted file mode 100644
index 5c3831807..000000000
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/Data.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload;
-
-import io.netty.buffer.ByteBuf;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkCodec;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkDecoder;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkMemberEncoder;
-import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
-
-public interface Data {
-
-    default void handle(NetWorkUser user) {
-    }
-
-    static <B extends ByteBuf, T extends Data> NetworkCodec<B, T> codec(NetworkMemberEncoder<B, T> networkMemberEncoder, NetworkDecoder<B, T> networkDecoder) {
-        return NetworkCodec.ofMember(networkMemberEncoder, networkDecoder);
-    }
-
-}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/PayloadHelper.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/PayloadHelper.java
index b3cb840f3..39542a4b7 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/PayloadHelper.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/PayloadHelper.java
@@ -1,55 +1,44 @@
 package net.momirealms.craftengine.bukkit.plugin.network.payload;
 
 import io.netty.buffer.Unpooled;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkCodec;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.protocol.CancelBlockUpdateData;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.protocol.ClientBlockStateSizeData;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.protocol.ClientCustomBlockData;
+import net.momirealms.craftengine.bukkit.plugin.network.payload.protocol.CancelBlockUpdatePacket;
+import net.momirealms.craftengine.bukkit.plugin.network.payload.protocol.ClientBlockStateSizePacket;
+import net.momirealms.craftengine.bukkit.plugin.network.payload.protocol.ClientCustomBlockPacket;
 import net.momirealms.craftengine.core.plugin.CraftEngine;
+import net.momirealms.craftengine.core.plugin.network.ModPacket;
 import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
 import net.momirealms.craftengine.core.plugin.network.NetworkManager;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
+import net.momirealms.craftengine.core.registry.BuiltInRegistries;
+import net.momirealms.craftengine.core.registry.Holder;
+import net.momirealms.craftengine.core.registry.WritableRegistry;
 import net.momirealms.craftengine.core.util.FriendlyByteBuf;
+import net.momirealms.craftengine.core.util.ResourceKey;
 
-import java.util.HashMap;
-import java.util.Map;
-import java.util.concurrent.atomic.AtomicInteger;
+import java.util.Optional;
 
 public class PayloadHelper {
-    private static final Map<Class<Data>, Byte> classToType = new HashMap<>();
-    private static final Map<Byte, NetworkCodec<FriendlyByteBuf, Data>> typeToCodec = new HashMap<>();
-    private static final AtomicInteger typeCounter = new AtomicInteger(0);
 
     public static void registerDataTypes() {
-        registerDataType(ClientCustomBlockData.class, ClientCustomBlockData.CODEC);
-        registerDataType(CancelBlockUpdateData.class, CancelBlockUpdateData.CODEC);
-        registerDataType(ClientBlockStateSizeData.class, ClientBlockStateSizeData.CODEC);
+        registerDataType(ClientCustomBlockPacket.TYPE, ClientCustomBlockPacket.CODEC);
+        registerDataType(CancelBlockUpdatePacket.TYPE, CancelBlockUpdatePacket.CODEC);
+        registerDataType(ClientBlockStateSizePacket.TYPE, ClientBlockStateSizePacket.CODEC);
     }
 
-    @SuppressWarnings("unchecked")
-    private static <T extends Data> void registerDataType(Class<T> dataClass, NetworkCodec<FriendlyByteBuf, T> codec) {
-        if (classToType.containsKey(dataClass)) {
-            CraftEngine.instance().logger().warn("Duplicate data type class: " + dataClass.getName());
-            return;
-        }
-        int next = typeCounter.getAndIncrement();
-        if (next > 255) {
-            throw new IllegalStateException("Too many data types registered, byte index overflow (max 256)");
-        }
-        byte type = (byte) next;
-        classToType.put((Class<Data>) dataClass, type);
-        typeToCodec.put(type, (NetworkCodec<FriendlyByteBuf, Data>) codec);
+    public static <T extends ModPacket> void registerDataType(ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> key, NetworkCodec<FriendlyByteBuf, T> codec) {
+        ((WritableRegistry<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>>) BuiltInRegistries.MOD_PACKET).register(key, codec);
     }
 
-    public static void sendData(NetWorkUser user, Data data) {
-        Class<? extends Data> dataClass = data.getClass();
-        Byte type = classToType.get(dataClass);
-        if (type == null) {
-            CraftEngine.instance().logger().warn("Unknown data type class: " + dataClass.getName());
+    public static void sendData(NetWorkUser user, ModPacket data) {
+        Optional<Holder.Reference<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>>> optionalType = BuiltInRegistries.MOD_PACKET.get(data.type());
+        if (optionalType.isEmpty()) {
+            CraftEngine.instance().logger().warn("Unknown data type class: " + data.getClass().getName());
             return;
         }
-        NetworkCodec<FriendlyByteBuf, Data> codec = typeToCodec.get(type);
+        @SuppressWarnings("unchecked")
+        NetworkCodec<FriendlyByteBuf, ModPacket> codec = (NetworkCodec<FriendlyByteBuf, ModPacket>) optionalType.get().value();
         FriendlyByteBuf buf = new FriendlyByteBuf(Unpooled.buffer());
-        buf.writeByte(type);
+        buf.writeByte(BuiltInRegistries.MOD_PACKET.getId(codec));
         codec.encode(buf, data);
         user.sendCustomPayload(NetworkManager.MOD_CHANNEL_KEY, buf.array());
     }
@@ -57,13 +46,14 @@ public class PayloadHelper {
     public static void handleReceiver(Payload payload, NetWorkUser user) {
         FriendlyByteBuf buf = payload.toBuffer();
         byte type = buf.readByte();
-        NetworkCodec<FriendlyByteBuf, Data> codec = typeToCodec.get(type);
+        @SuppressWarnings("unchecked")
+        NetworkCodec<FriendlyByteBuf, ModPacket> codec = (NetworkCodec<FriendlyByteBuf, ModPacket>) BuiltInRegistries.MOD_PACKET.getValue(type);
         if (codec == null) {
             CraftEngine.instance().logger().warn("Unknown data type received: " + type);
             return;
         }
 
-        Data networkData = codec.decode(buf);
+        ModPacket networkData = codec.decode(buf);
         networkData.handle(user);
     }
 }
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkDecoder.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkDecoder.java
deleted file mode 100644
index 6116b6f62..000000000
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkDecoder.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.codec;
-
-public interface NetworkDecoder<I, T> {
-    T decode(I in);
-}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/CancelBlockUpdateData.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/CancelBlockUpdateData.java
deleted file mode 100644
index 96fddb2c1..000000000
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/CancelBlockUpdateData.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.protocol;
-
-import net.momirealms.craftengine.bukkit.plugin.network.payload.Data;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.PayloadHelper;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkCodec;
-import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
-import net.momirealms.craftengine.core.util.FriendlyByteBuf;
-
-public record CancelBlockUpdateData(boolean enabled) implements Data {
-    public static final NetworkCodec<FriendlyByteBuf, CancelBlockUpdateData> CODEC = Data.codec(
-            CancelBlockUpdateData::encode,
-            CancelBlockUpdateData::new
-    );
-
-    private CancelBlockUpdateData(FriendlyByteBuf buf) {
-        this(buf.readBoolean());
-    }
-
-    private void encode(FriendlyByteBuf buf) {
-        buf.writeBoolean(this.enabled);
-    }
-
-    @Override
-    public void handle(NetWorkUser user) {
-        if (!this.enabled) return;
-        PayloadHelper.sendData(user, this);
-    }
-}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/CancelBlockUpdatePacket.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/CancelBlockUpdatePacket.java
new file mode 100644
index 000000000..2ff964065
--- /dev/null
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/CancelBlockUpdatePacket.java
@@ -0,0 +1,39 @@
+package net.momirealms.craftengine.bukkit.plugin.network.payload.protocol;
+
+import net.momirealms.craftengine.core.plugin.network.ModPacket;
+import net.momirealms.craftengine.bukkit.plugin.network.payload.PayloadHelper;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
+import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
+import net.momirealms.craftengine.core.registry.BuiltInRegistries;
+import net.momirealms.craftengine.core.util.FriendlyByteBuf;
+import net.momirealms.craftengine.core.util.Key;
+import net.momirealms.craftengine.core.util.ResourceKey;
+
+public record CancelBlockUpdatePacket(boolean enabled) implements ModPacket {
+    public static final ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> TYPE = ResourceKey.create(
+            BuiltInRegistries.MOD_PACKET.key().location(), Key.of("craftengine", "cancel_block_update")
+    );
+    public static final NetworkCodec<FriendlyByteBuf, CancelBlockUpdatePacket> CODEC = ModPacket.codec(
+            CancelBlockUpdatePacket::encode,
+            CancelBlockUpdatePacket::new
+    );
+
+    private CancelBlockUpdatePacket(FriendlyByteBuf buf) {
+        this(buf.readBoolean());
+    }
+
+    private void encode(FriendlyByteBuf buf) {
+        buf.writeBoolean(this.enabled);
+    }
+
+    @Override
+    public ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> type() {
+        return TYPE;
+    }
+
+    @Override
+    public void handle(NetWorkUser user) {
+        if (!this.enabled) return;
+        PayloadHelper.sendData(user, this);
+    }
+}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientBlockStateSizeData.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientBlockStateSizeData.java
deleted file mode 100644
index ff20e81e9..000000000
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientBlockStateSizeData.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.protocol;
-
-
-import net.momirealms.craftengine.bukkit.plugin.network.payload.Data;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkCodec;
-import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
-import net.momirealms.craftengine.core.util.FriendlyByteBuf;
-import net.momirealms.craftengine.core.util.IntIdentityList;
-
-public record ClientBlockStateSizeData(int blockStateSize) implements Data {
-    public static final NetworkCodec<FriendlyByteBuf, ClientBlockStateSizeData> CODEC = Data.codec(
-            ClientBlockStateSizeData::encode,
-            ClientBlockStateSizeData::new
-    );
-
-    private ClientBlockStateSizeData(FriendlyByteBuf buf) {
-        this(buf.readInt());
-    }
-
-    private void encode(FriendlyByteBuf buf) {
-        buf.writeInt(this.blockStateSize);
-    }
-
-    @Override
-    public void handle(NetWorkUser user) {
-        user.setClientBlockList(new IntIdentityList(this.blockStateSize));
-    }
-
-}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientBlockStateSizePacket.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientBlockStateSizePacket.java
new file mode 100644
index 000000000..7e87ee564
--- /dev/null
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientBlockStateSizePacket.java
@@ -0,0 +1,40 @@
+package net.momirealms.craftengine.bukkit.plugin.network.payload.protocol;
+
+
+import net.momirealms.craftengine.core.plugin.network.ModPacket;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
+import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
+import net.momirealms.craftengine.core.registry.BuiltInRegistries;
+import net.momirealms.craftengine.core.util.FriendlyByteBuf;
+import net.momirealms.craftengine.core.util.IntIdentityList;
+import net.momirealms.craftengine.core.util.Key;
+import net.momirealms.craftengine.core.util.ResourceKey;
+
+public record ClientBlockStateSizePacket(int blockStateSize) implements ModPacket {
+    public static final ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> TYPE = ResourceKey.create(
+            BuiltInRegistries.MOD_PACKET.key().location(), Key.of("craftengine", "client_block_state_size")
+    );
+    public static final NetworkCodec<FriendlyByteBuf, ClientBlockStateSizePacket> CODEC = ModPacket.codec(
+            ClientBlockStateSizePacket::encode,
+            ClientBlockStateSizePacket::new
+    );
+
+    private ClientBlockStateSizePacket(FriendlyByteBuf buf) {
+        this(buf.readInt());
+    }
+
+    private void encode(FriendlyByteBuf buf) {
+        buf.writeInt(this.blockStateSize);
+    }
+
+    @Override
+    public ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> type() {
+        return TYPE;
+    }
+
+    @Override
+    public void handle(NetWorkUser user) {
+        user.setClientBlockList(new IntIdentityList(this.blockStateSize));
+    }
+
+}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientCustomBlockData.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientCustomBlockPacket.java
similarity index 56%
rename from bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientCustomBlockData.java
rename to bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientCustomBlockPacket.java
index c24d0f403..9bfe2a7f8 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientCustomBlockData.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/protocol/ClientCustomBlockPacket.java
@@ -3,20 +3,26 @@ package net.momirealms.craftengine.bukkit.plugin.network.payload.protocol;
 
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TranslationArgument;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.Data;
-import net.momirealms.craftengine.bukkit.plugin.network.payload.codec.NetworkCodec;
+import net.momirealms.craftengine.core.plugin.network.ModPacket;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
 import net.momirealms.craftengine.bukkit.util.RegistryUtils;
 import net.momirealms.craftengine.core.plugin.network.NetWorkUser;
+import net.momirealms.craftengine.core.registry.BuiltInRegistries;
 import net.momirealms.craftengine.core.util.FriendlyByteBuf;
 import net.momirealms.craftengine.core.util.IntIdentityList;
+import net.momirealms.craftengine.core.util.Key;
+import net.momirealms.craftengine.core.util.ResourceKey;
 
-public record ClientCustomBlockData(int size) implements Data {
-    public static final NetworkCodec<FriendlyByteBuf, ClientCustomBlockData> CODEC = Data.codec(
-            ClientCustomBlockData::encode,
-            ClientCustomBlockData::new
+public record ClientCustomBlockPacket(int size) implements ModPacket {
+    public static final ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> TYPE = ResourceKey.create(
+            BuiltInRegistries.MOD_PACKET.key().location(), Key.of("craftengine", "client_custom_block")
+    );
+    public static final NetworkCodec<FriendlyByteBuf, ClientCustomBlockPacket> CODEC = ModPacket.codec(
+            ClientCustomBlockPacket::encode,
+            ClientCustomBlockPacket::new
     );
 
-    private ClientCustomBlockData(FriendlyByteBuf buf) {
+    private ClientCustomBlockPacket(FriendlyByteBuf buf) {
         this(buf.readInt());
     }
 
@@ -24,6 +30,11 @@ public record ClientCustomBlockData(int size) implements Data {
         buf.writeInt(this.size);
     }
 
+    @Override
+    public ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> type() {
+        return TYPE;
+    }
+
     @Override
     public void handle(NetWorkUser user) {
         int serverBlockRegistrySize = RegistryUtils.currentBlockRegistrySize();
diff --git a/core/src/main/java/net/momirealms/craftengine/core/plugin/network/ModPacket.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/ModPacket.java
new file mode 100644
index 000000000..9776a4fee
--- /dev/null
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/ModPacket.java
@@ -0,0 +1,21 @@
+package net.momirealms.craftengine.core.plugin.network;
+
+import io.netty.buffer.ByteBuf;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkDecoder;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkMemberEncoder;
+import net.momirealms.craftengine.core.util.FriendlyByteBuf;
+import net.momirealms.craftengine.core.util.ResourceKey;
+
+public interface ModPacket {
+
+    ResourceKey<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> type();
+
+    default void handle(NetWorkUser user) {
+    }
+
+    static <B extends ByteBuf, T extends ModPacket> NetworkCodec<B, T> codec(NetworkMemberEncoder<B, T> networkMemberEncoder, NetworkDecoder<B, T> networkDecoder) {
+        return NetworkCodec.ofMember(networkMemberEncoder, networkDecoder);
+    }
+
+}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkCodec.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkCodec.java
similarity index 93%
rename from bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkCodec.java
rename to core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkCodec.java
index 3b60ae459..356ee14f7 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkCodec.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkCodec.java
@@ -1,4 +1,4 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.codec;
+package net.momirealms.craftengine.core.plugin.network.codec;
 
 import java.util.function.Function;
 
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkCodecs.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkCodecs.java
similarity index 99%
rename from bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkCodecs.java
rename to core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkCodecs.java
index 0ff08bc1d..0589a2df5 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkCodecs.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkCodecs.java
@@ -1,4 +1,4 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.codec;
+package net.momirealms.craftengine.core.plugin.network.codec;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufInputStream;
diff --git a/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkDecoder.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkDecoder.java
new file mode 100644
index 000000000..b6e1bd5a8
--- /dev/null
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkDecoder.java
@@ -0,0 +1,5 @@
+package net.momirealms.craftengine.core.plugin.network.codec;
+
+public interface NetworkDecoder<I, T> {
+    T decode(I in);
+}
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkEncoder.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkEncoder.java
similarity index 51%
rename from bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkEncoder.java
rename to core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkEncoder.java
index eb17f0476..0c79a9164 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkEncoder.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkEncoder.java
@@ -1,4 +1,4 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.codec;
+package net.momirealms.craftengine.core.plugin.network.codec;
 
 public interface NetworkEncoder<O, T> {
     void encode(O out, T value);
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkMemberEncoder.java b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkMemberEncoder.java
similarity index 60%
rename from bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkMemberEncoder.java
rename to core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkMemberEncoder.java
index 49a60707f..0b96c1b7a 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/payload/codec/NetworkMemberEncoder.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/codec/NetworkMemberEncoder.java
@@ -1,4 +1,4 @@
-package net.momirealms.craftengine.bukkit.plugin.network.payload.codec;
+package net.momirealms.craftengine.core.plugin.network.codec;
 
 @FunctionalInterface
 public interface NetworkMemberEncoder<O, T> {
diff --git a/core/src/main/java/net/momirealms/craftengine/core/registry/BuiltInRegistries.java b/core/src/main/java/net/momirealms/craftengine/core/registry/BuiltInRegistries.java
index 806b20c22..e90410cab 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/registry/BuiltInRegistries.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/registry/BuiltInRegistries.java
@@ -40,6 +40,9 @@ import net.momirealms.craftengine.core.plugin.context.condition.ConditionFactory
 import net.momirealms.craftengine.core.plugin.context.function.FunctionFactory;
 import net.momirealms.craftengine.core.plugin.context.number.NumberProviderFactory;
 import net.momirealms.craftengine.core.plugin.context.selector.PlayerSelectorFactory;
+import net.momirealms.craftengine.core.plugin.network.ModPacket;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
+import net.momirealms.craftengine.core.util.FriendlyByteBuf;
 import net.momirealms.craftengine.core.util.ResourceKey;
 
 public class BuiltInRegistries {
@@ -81,6 +84,7 @@ public class BuiltInRegistries {
     public static final Registry<LegacyRecipe.Type> LEGACY_RECIPE_TYPE = createConstantBoundRegistry(Registries.LEGACY_RECIPE_TYPE);
     public static final Registry<PostProcessor.Type<?>> RECIPE_POST_PROCESSOR_TYPE = createConstantBoundRegistry(Registries.RECIPE_POST_PROCESSOR_TYPE);
     public static final Registry<ItemUpdaterType<?>> ITEM_UPDATER_TYPE = createConstantBoundRegistry(Registries.ITEM_UPDATER_TYPE);
+    public static final Registry<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>> MOD_PACKET = createConstantBoundRegistry(Registries.MOD_PACKET);
 
     private static <T> Registry<T> createConstantBoundRegistry(ResourceKey<? extends Registry<T>> key) {
         return new ConstantBoundRegistry<>(key);
diff --git a/core/src/main/java/net/momirealms/craftengine/core/registry/Registries.java b/core/src/main/java/net/momirealms/craftengine/core/registry/Registries.java
index d06a53394..8b8725e2d 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/registry/Registries.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/registry/Registries.java
@@ -40,6 +40,9 @@ import net.momirealms.craftengine.core.plugin.context.condition.ConditionFactory
 import net.momirealms.craftengine.core.plugin.context.function.FunctionFactory;
 import net.momirealms.craftengine.core.plugin.context.number.NumberProviderFactory;
 import net.momirealms.craftengine.core.plugin.context.selector.PlayerSelectorFactory;
+import net.momirealms.craftengine.core.plugin.network.ModPacket;
+import net.momirealms.craftengine.core.plugin.network.codec.NetworkCodec;
+import net.momirealms.craftengine.core.util.FriendlyByteBuf;
 import net.momirealms.craftengine.core.util.Key;
 import net.momirealms.craftengine.core.util.ResourceKey;
 
@@ -83,4 +86,5 @@ public class Registries {
     public static final ResourceKey<Registry<LegacyRecipe.Type>> LEGACY_RECIPE_TYPE = ResourceKey.create(ROOT_REGISTRY, Key.withDefaultNamespace("legacy_recipe_type"));
     public static final ResourceKey<Registry<PostProcessor.Type<?>>> RECIPE_POST_PROCESSOR_TYPE = ResourceKey.create(ROOT_REGISTRY, Key.withDefaultNamespace("recipe_post_processor_type"));
     public static final ResourceKey<Registry<ItemUpdaterType<?>>> ITEM_UPDATER_TYPE = ResourceKey.create(ROOT_REGISTRY, Key.withDefaultNamespace("item_updater_type"));
+    public static final ResourceKey<Registry<NetworkCodec<FriendlyByteBuf, ? extends ModPacket>>> MOD_PACKET = ResourceKey.create(ROOT_REGISTRY, Key.withDefaultNamespace("mod_packet"));
 }