Eviscerate

You cause the bit of aberrant flesh in your hand to transform into a warped portal that teleports right next to a creature within range. A spiky, bladed limb of dark energy emerges from the portal to then hack and stab at the target. That creature must make a Dexterity saving throw, taking 2d6 piercing damage + 4d8 necrotic damage on a failed save, or half as much damage on a success. On either a failure or a save, the creature's hit point maximum is reduced by the amount of necrotic damage dealt. If this attack reduces the creature's hit point maximum to 5 or lower, it is killed instantly as its body is torn apart from the inside and out by necrotic energy.

At Higher Levels. If this spell is cast using a spell slot of 6th level or higher, the amount of necrotic damage is increased by 1d8 for each spell slot above 5th.