Need help with spell

I need a spell for the RPG in wich I'm working.

Description:
The hero throws an energy ball to the direction he is facing, the energy ball explodes on the first unit or destrucible that it finds on it's way, and, accordingly, deals damage to it.

How Can I create this spell.

Try creating a flying unit with some energy-ball-looking model, giving it the Aloc ability and AOE Damage on Death, and ordering it to move to a point extremely far away from the caster in the caster's facing direction. Then... Well, there's got to be an ability that will cause the unit to self-destruct if it comes near enough an enemy unit. I'll check, hold on a moment.

Edit: Try "Mine - Exploding (Goblin Land Mine)" I think that's got to be what makes the mines self-explode when something "touches" them.

Thanks I'll try when I get Home. :D

Well, it worked, but I didn't like the results, the unit flies to high sometimes, and I can't set the max_unit_speed in game constants to more than 400.

Put its Z down to 1 and erase its pathing.