Spell Help - Corspe Explosion

I am making a Diablo III game, and I want the Necromancer to have a Corpse Explosion similar to the real game. If you can help, please reply.

Thanx

So far, this is what i have thought of:

-base model: force of nature
-raises a dummy unit from a corpse that lasts 0.1 seconds
-dummy unit causes damage wen dies (like land mine)

i dont know how to get it to do 40%-100% of the corpses life for damage. :(



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