The Cut

You summon a dark blade of shadow and send it flying in front of you. The blade of shadow cuts through anything in it path. Each creature in a 20-foot cone must make a Dexterity saving throw. A creature takes 6d8 necrotic damage on a failed save, or half as much damage on a successful one.

Any creature with no ability to death save is sliced through completley, sending limbs, heads or legs flying.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 1st.