Elemental Rebuttal

Upon being harmed by an elementally damaging attack (acid, cold, fire, force, lightning, necrotic, radiant, and thunder), you retain the energy and unleash it back upon your attacker. The creature must make a Dexterity saving throw. It takes 2d10 damage of the triggering type on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d10 for each slot level above 2nd.