Elemental Blast

You fire a burst of raw arcane energy from your outstretched palm in a Line that is 15 ft. long and 5 ft. wide. Each target in that area must make a Dexterity saving throw, taking 3d8 fire, lightning, acid, bludgeoning, thunder, cold, necrotic, or radiant damage on a failed save, or half as much on a success.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 2.