blackflame

You conjure a searing black flame that strikes a creature you can see within range. The flame deals 6d6 fire damage and 2d6 necrotic damage. The target must make a Dexterity saving throw. On a failed save, the target takes full damage; on a successful save, it takes half as much damage.

The black flame lingers, reducing the target's maximum hit points by the necrotic damage dealt for 1 minute. A creature can only have its maximum hit points reduced this way once per day.

If the target is reduced to 0 hit points by this spell, it is consumed by the black flame and turns to ash, leaving behind only a charred, lifeless corpse.