Spell help!!

[Tenrai]

I want to make a spell that works like Necromancers "poison nova" in Diablo 2, but it will cast 20(or something like that) Death Coils in a ring emittinig from the caster and will damage the unit they hit.

I need help to make a trigger for this. can somebody help me?

 

[Exide]

Check this out:
http://www.thehelper.net/forums/showthread.php?p=554413

EDIT: You can probably edit the first spell there a bit to look like the one you want.

 

[Tenrai]

Yes that is quite right, thank you.
but i just want to send´out 1 ring of skulle that damages and explode when hitting a target or flied like 500(range).

Do you know how to do that?