Death Coil

The wielder of the spell must have eye contact with the target, point a hand to target and say "Akhtun Makhaal" aloud. After that, a dark green aura will envelop you and a green skull will splash out of your hand and rapidly fly towards the target. When the skull hits the target, the target takes 1d8 damage + your Intelligence modifier. After the damage is dealt, the target must make a Wisdom check to keep from going insane. If the target fails the saving throw, it takes an additional 1d8 damage + your Intelligence modifier and has disadvantage on the next check for something. On subsequent turns, the target will make the Wisdom check again and again until it succeeds. At character level 6, 9, 15, and 20, the damage will increase to 2d8, 3d8, 4d8, and 4d12, respectively.