Acid Rain

Your hands glow green from your pointing finger to a point you choose within range and then pours a cloud of raining acid. Each creature in a 20-foot-radius sphere centered on that point must make a CON saving throw. On a failed save creatures will take 8d6 acid damage, or half as much damage on a successful one.

The acid spreads around corners.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.