The caster of this spell could target a creature near it and cause the creature to begin attacking its own self and do so in the most violent way possible. The caster chose one of the following two effects:

Cause the target to wield their own weapon (dagger, mace, fists, claws, etc) and begin violently attacking themselves in their own face for the duration or until death

Cause the target to pound their face against the nearest hard surface with all of their might over and over for the duration or until death. If the target was wearing a helmet, it would uncontrollably remove it when the spell effect began. Anyone attempting to help the target using their hands must make a Dexterity saving throw or take 1d8 damage each time they attempt to