Corrosive Wave

A tide of extremely corrosive and acerbic gas or liquid blooms forth from your position. Each creature in a 20-foot-radius sphere centered on you must make a Constitution saving throw. A target takes 8d6 acid damage on a failed save, or half as much damage on a successful one.
For each target that failed its saving throw, it takes an additional 1d4 acid damage at the start of its turns for the next 1d4 rounds.

The acid or gas spreads around corners. It corrodes nonmetal objects in the area that aren't being worn or carried.

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. When you cast this spell at 5th level or higher, the extra damage then also increases by 1d4 for every two levels above the 3rd.