That's one heck of a commit you've got there...

I may have got a bit behind with version control. A lot behind, in fact. Maybe I'll go back and split this sometime - then again, I probably won't. But hey, at least it's here!

src/main/java/electroblob/wizardry/packet/PacketPossession.java

@@ -0,0 +1,58 @@
+package electroblob.wizardry.packet;
+
+import electroblob.wizardry.Wizardry;
+import io.netty.buffer.ByteBuf;
+import net.minecraft.entity.EntityLiving;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessage;
+import net.minecraftforge.fml.common.network.simpleimpl.IMessageHandler;
+import net.minecraftforge.fml.common.network.simpleimpl.MessageContext;
+
+import javax.annotation.Nullable;
+
+/** <b>[Server -> Client]</b> This packet is sent when a player possesses an entity or when a player stops possessing
+ * to update all clients. */
+public class PacketPossession implements IMessageHandler<PacketPossession.Message, IMessage> {
+
+	@Override
+	public IMessage onMessage(Message message, MessageContext ctx){
+
+		// Just to make sure that the side is correct
+		if(ctx.side.isClient()){
+			net.minecraft.client.Minecraft.getMinecraft().addScheduledTask(() -> Wizardry.proxy.handlePossessionPacket(message));
+		}
+
+		return null;
+	}
+
+	public static class Message implements IMessage {
+
+		public int playerID;
+		public int targetID;
+		public int duration;
+
+		// This constructor is required otherwise you'll get errors (used somewhere in fml through reflection)
+		public Message(){
+		}
+
+		public Message(EntityPlayer host, @Nullable EntityLiving target, int duration){
+			this.playerID = host.getEntityId();
+			this.targetID = target == null ? -1 : target.getEntityId();
+			this.duration = duration;
+		}
+
+		@Override
+		public void fromBytes(ByteBuf buf){
+			this.playerID = buf.readInt();
+			this.targetID = buf.readInt();
+			this.duration = buf.readInt();
+		}
+
+		@Override
+		public void toBytes(ByteBuf buf){
+			buf.writeInt(playerID);
+			buf.writeInt(targetID);
+			buf.writeInt(duration);
+		}
+	}
+}