If you plan on releasing another I'd recommend you try having your boss summon other creatures. If you really want to explore, in the same script put a couple lua scripts for the spawns as well.
If the spawned creature is set as a variable you can also make it complete actions if its not in the function. (Make the creature and its spawn cast a spell onto the player maybe?)
Yeah i know... :P thanks for the heads up shadowslayer i changed it a big so he summons some ghouls to aid him