'Eadbang

You point at an enemy you can see within range, channeling a green Waaaagh energy before it lances into the mind of the target. The target must make a Wisdom save or take 3d6 Psychic damage on a fail, or half as much on a success. Additionally, if a target is reduced to 0 Hit Points by this spell, their head explodes. 

At Higher Levels: When casting this spell with a spell slot of 4th level or higher, the spell's damage increases by 1d6 per level.