Acid Storm

When you cast this spell; a large, dark cloud fills the sky; blocking out the sun. Acid rain begins to fall on the ground in a 160 ft. radius cylinder. A creature that enters this area for the first time on its turn or starts its turn there takes 8d4 acid damage. Any non-magical object in the area of this spell is also subject to the acid damage. A creature or object is safe from the damage of this spell if it is in full cover.