Acid Rain

Dark clouds gather above the battlefield before unleashing a torrential downpour of potent acid. Each creature in a 20-foot radius must make a Dexterity saving throw. A target takes 8d6 acid damage on a failed save, or half as much damage on a successful one. The rain reaches around corners. It saturates susceptible objects in the area that aren’t being worn or carried.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.