Catalyze Death

Make a ranged spell attack at a creature within range as a fist-sized ball of roiling blackness erupts from your palm. On a hit this spell deals 4d8 necrotic damage and they must make a Constitution saving throw. On a failure the creature takes an additional 5 necrotic damage and their maximum hit points are reduced by the same amount.

At Higher Levels: When cast using a spell slot of 3rd or higher, the secondary necrotic damage increases by 5 per slot level over 2nd.