Acid Rain

A noxious cloud forms in the shape of a cylinder that is 60 feet tall with a 40-foot radius, centred on a point you can see 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 8d4 acid damage, and becomes covered in acid.

A creature takes 2d4 acid damage if it ends its turn while covered with acid. A creature or a creature within 5 feet of it can clear the acid with an action.