Acid Rain

A storm of acidic rain falls in a 20-foot radius cylinder centered on a point within range. When a creature enters the area for the first time or starts its turn there, it must make a Dexterity saving throw. On a failed save, a creature takes 8d4 acid damage. On a successful save, a creature takes half of that damage.

Using a Higher-Level Spell Slot. The damage increases by 2d4 for each spell slot level above 4.