Caress of the Black Goat of the Wood

Invokes the wrath of the outer god Shub-Niggurath inflicing 1d8 psychic damage. Make a melee spell attack against the target. On a hit, the target takes 1d8 psychic damage, and it can’t make Opportunity Attacks until the start of its next turn. Save negates. As the target goes mad with arousal. 

Cantrip Upgrade. The damage increases by 1d8 when you reach levels 5 (2d8), 11 (3d8), and 17 (4d8).