Caustic Quarrel 2014

You conjure an arrow of acid and send it streaking towards a target within range. Make a ranged spell attack. On a hit, the target takes 6d4 acid damage and is coated in acid. An acid-coated target can use its action to wipe the acid off. If not, then at the end of its next turn, it takes an additional 4d4 acid damage.

When you cast this spell using a spell slot of 3rd level or higher, both instances of damage increase by 1d4 for each slot level above 2nd.