Divine Touch

Channeling the power of the upper planes, make a melee spell attack against a target within reach. On a hit, the target takes 1d6 Radiant damage, and the target makes a charisma saving throw. On a failed save, the target can’t attack you with melee attack until the end of your next turn. If the target has all their hit points remaining, the damage this spell deals is 1d10. 

Cantrip Upgrade. The damage increases by 1d6 when you reach levels 5 (2d6) or (2d10), 11 (3d6) or (3d10), and 17 (4d6) or (4d10).