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/PacketSpellProperties.java

@@ -0,0 +1,64 @@
+package electroblob.wizardry.packet;
+
+import electroblob.wizardry.spell.Spell;
+import electroblob.wizardry.util.SpellProperties;
+import io.netty.buffer.ByteBuf;
+import net.minecraft.entity.player.EntityPlayerMP;
+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 to sync server-side spell properties with clients on login. */
+public class PacketSpellProperties implements IMessageHandler<PacketSpellProperties.Message, IMessage> {
+
+	@Override
+	public IMessage onMessage(Message message, MessageContext ctx){
+
+		// Just to make sure that the side is correct
+		if(ctx.side.isServer()){
+
+			final EntityPlayerMP player = ctx.getServerHandler().player;
+
+			player.getServerWorld().addScheduledTask(() -> {
+				for(int i=0; i<message.propertiesArray.length; i++){
+					Spell.byNetworkID(i).setProperties(message.propertiesArray[i]);
+				}
+			});
+		}
+
+		return null;
+	}
+
+	public static class Message implements IMessage {
+
+		private SpellProperties[] propertiesArray;
+
+		// This constructor is required otherwise you'll get errors (used somewhere in fml through reflection)
+		public Message(){}
+
+		public Message(SpellProperties... properties){
+			this.propertiesArray = properties;
+		}
+
+		@Override
+		public void fromBytes(ByteBuf buf){
+
+			List<SpellProperties> propertiesList = new ArrayList<>();
+			int i = 0;
+
+			while(buf.isReadable()){
+				propertiesList.add(new SpellProperties(Spell.byNetworkID(i++), buf));
+			}
+
+			propertiesArray = propertiesList.toArray(new SpellProperties[0]);
+		}
+
+		@Override
+		public void toBytes(ByteBuf buf){
+			for(SpellProperties properties : propertiesArray) properties.write(buf);
+		}
+	}
+}