Caustic Immolation

Acid bubbles and coats one creature you can see within range. The target must make a Constitution saving throw. It takes 8d6 acid damage on a failed save, or half as much damage on a successful one. On a failed save, the target also melts for the spell’s duration. At the end of each of its turns, the target repeats the saving throw. It takes 4d6 acid damage on a failed save, and the spell ends on a successful one. 

If damage from this spell kills a target, the target explodes dealing 4d6 acid damage to anything within 10 feet.