Caustic Blast

Extend your hand and, from your palm, blast a ball of acid to a point you choose within range and then it bursts splashing all creatures caught in it. Each creature in a 20-foot-radius sphere centered on that point must make a DEX saving throw. A target takes 8d6 acid damage on a failed save, or half as much damage on a successful one. Any target hit with this spell takes an additional 1d4 acid damage for the next 2 rounds.

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.