Apostate’s Consecrated Coldcock

Your fist gleams with silvery arcane light. For the duration you can use a magic action to make a melee spell attack against a creature within reach of your unarmed attack. On a successful hit the target takes 2d10 radiant damage and must succeed on a Strength saving throw or be knocked prone and pushed up to 5 feet away from you. 

Using a Higher-Level Spell Slot. The damage increases by 2d10 and the distance the target may be pushed away from you on a failed save increases by 5 feet for each slot level above 1.