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/PacketEmitterData.java

@@ -0,0 +1,55 @@
+package electroblob.wizardry.packet;
+
+import electroblob.wizardry.Wizardry;
+import electroblob.wizardry.command.SpellEmitter;
+import io.netty.buffer.ByteBuf;
+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 java.util.ArrayList;
+import java.util.List;
+
+/**
+ * <b>[Server -> Client]</b> This packet is sent each time a player joins a world to synchronise the client-side spell
+ * emitters with the server-side ones.
+ */
+public class PacketEmitterData implements IMessageHandler<PacketEmitterData.Message, IMessage> {
+
+	@Override
+	public IMessage onMessage(Message message, MessageContext ctx){
+		// Just to make sure that the side is correct
+		if(ctx.side.isClient()){
+			// Using a fully qualified name is a good course of action here; we don't really want to clutter the proxy
+			// methods any more than necessary.
+			net.minecraft.client.Minecraft.getMinecraft().addScheduledTask(() -> Wizardry.proxy.handleEmitterDataPacket(message));
+		}
+
+		return null;
+	}
+
+	public static class Message implements IMessage {
+
+		public List<SpellEmitter> emitters;
+
+		// This constructor is required otherwise you'll get errors (used somewhere in fml through reflection)
+		public Message(){}
+
+		public Message(List<SpellEmitter> emitters){
+			this.emitters = emitters;
+		}
+
+		@Override
+		public void fromBytes(ByteBuf buf){
+			emitters = new ArrayList<>();
+			while(buf.isReadable()){
+				emitters.add(SpellEmitter.read(buf));
+			}
+		}
+
+		@Override
+		public void toBytes(ByteBuf buf){
+			emitters.forEach(s -> s.write(buf));
+		}
+	}
+}