Rock based move

[Killd0zer]

I tried to make a spell that when casts, picks all enemy units (non structure) and does damage + stuns them through firebolt with the model as a rock with a high arch, but for some reason it only damages one unit, could someone make me this spell?

I used channel for the base move, and firebolt for the damage and stun, I only need the trigger to make dummy units cast the rock spell.