There is a function in the last quest file I posted that spawns any enemy, including bosses, while a)the number of current enemies is less than X, b)there's a trigger variable int Z that is less than Y. The script sets Y to +=1 of what it was when the enemy dies, and Y can be set to a number >1 so that the spawning happens as many times as desired.
"In Loving Memory of Dark Nation."
It wouldn't be difficult to modify one of the item spawning functions in there to drop the item desired when Z==whatever number of bosses get defeated in the room.
