Blood Boil

Choose up to three targets within 15 ft, all targets must succeed on a Constitution Saving Throw or take 2d6 points of Necrotic damage on a failed save, or half as much on a successful save. The caster heals for half of the total damage dealt by the spell.

The spell deals additional damage when you reach higher levels: 3d6 at 5th level, 4d6 at 11th level, and 5d6 at 17th level.