Erode

You blast a target with mass of acid. The target must make a Dexterity saving throw. On failure, the target takes 8d4 acid damage immediately and becomes covered in acid. A target covered in acid takes 2d4 acid damage at the end of each of its turns. The target or a creature within 5 feet of it can end this damage by using its action to clear away the acid. On a success, the target takes half as much damage and is not covered in acid.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage (both initial and later) increases by 1d4 for each slot level above 3rd.