Corpse Explosion

You cause a corpse within 30 feet of you to erupt and explode. Each creature within 10 feet of the chosen corpse must succeed on a DC Dexterity saving throw or take 2d6 necrotic damage on a failed save or half as much on a successful one. For each creature that is reduced to 0 hit points, you may regain the lowest extended spell slot of 3rd level or lower. 

When cast using higher spell slots (4th or higher) you can target one additional corpse and they do an extra 1d6  Necrotic damage