Corrosive Burst 2014

You hurl a ball of dripping acid outward, exploding in a 20- foot radius sphere at a point you can see within range. Every creature in the area must make a Dexterity saving throw, taking 8d4 acid damage on a failed save or half as much on a success. A creature that fails the save takes an additional 4d4 acid damage at the end of each of its turns unless it or another creature within 5 feet spends an action to clear the acid off.

When you cast this spell using a spell slot of 5th level or higher, the initial damage increases by 2d4 for each slot level above 4th.