Divine Rebuke

You call upon divine power to retaliate against your attacker. The creature that hit you with a melee attack must make a Dexterity saving throw. On a failed save, the creature takes 1d8 radiant damage and is pushed 5 feet away from you. On a successful save, the creature takes half as much damage and isn’t pushed.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).