Spell 'Evlin' ?

[aurora2]

Okay, so i learned this spell from a scroll and tried it out several times, but i can't understand what it really does...
When i use it, it creates a little purple smoke-like thing from a corpse. If an enemy or one of my troops get into the same cell as the Eviln, it damages the target, and does nothing more.. But the Spell's description says different things...
So if anyone can tell me what it really does, i would be happy