Corpse Burst

As a creature you can see in range dies, exluding constructs and undead, you can disperse the last of it's life energy in a burst of necrotic energy that destroyes the corpse to explosive effect. Every creature within 10ft of the corpse must make a Dexterity saving throw. On a failure, targets take 3d6 necrotic damage. On a success creatures take half damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 2d6 for each slot level above 2st.