Acid Rain

Acid rain begins falling within a 40-foot-radius 60-foot-high cylinder centered on a point you choose within range. When a creature moves into the spell’s area for the first time on a turn or starts its turn there, the creature must succeed on a Dexterity saving throw or take 6d4 acid damage, and become covered in acid. On a successful save, a creature takes half the initial damage and is not covered in acid.
A creature takes 3d4 acid damage if it ends its turn while covered with acid. The target or a creature within 5 feet of it can end this damage by using its action to clear away the acid.