Dissolve

You form an oscillating green liquid coating that covers your hand as you reach out to a target. Upon contact, the green liquid violently rushes over your target trailing magical bubbling green acid haphazardly across its body. Make a melee spell attack against the target. On a hit, the target takes 8d4 acid damage.

At the start of each of its turns until the spell ends, the target must make a Constitution saving throw. On a failed save, it takes 4d4 acid damage. On a successful save, the target takes no damage and the spell ends.