[Monster request] On death to following

[mooncows]

I'm looking for help on a script. I am making a special boss that when killed, the body will immediatly disapear, and 4 creatures will spawn where he died. The idea is you kill this slime type boss, and when he dies he breaks up into 4 smaller slimes. Those 4 each break into 4 smaller ones, and after they are killed a chest spawns in the room with rewards. Can anyone give me a hand? i know its alot to ask