Acid Rain

You unleash a storm of swirling acid in a cylinder 20-foot wide and 30-foot high centered on a point you can see. The area is heavily obscured by driving rainfall. A creature that starts its turn in or enters the area for the first time must make a Dexterity saving throw. On a failed save, the creature takes 6d6 acid damage, or half as much damage on a successful one.

When a creature leaves the area, it takes 3d6 acid damage at the start of its next turn.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the initial damage increases by 2d6, and the secondary damage increases by 1d6 for every two slot levels above 5th.