Acid Rain (5.5e Patch)

Acid rain begins falling within a 40-foot-radius 60-foot-high Cylinder centered on a point you choose within range. The area is Lightly Obscured. 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 target takes half the initial damage only.

A target 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 effect by using its action to clear away the acid.