Bonk of True Justice

You thrust your fist into your opponent (make an unarmed strike attack which is not required to hit) before screaming at the top of your lungs “BONK!” As this happens, a giant, ghostly baseball bat appears over the head of the target and makes a melee spell attack which, if successful, deals 8d10 psychic damage and 3d6 bludgeoning damage before sending the target 200 feet into the distance.