Visceral Scythe

At your command, the skull and spine of the corpse ripthemselves free, taking all the blood in the body with it. These unholy components form a scythe, with a blade of liquid blood. When you make a melee spell attack with this scythe, you ignore any armor that the target is wearing (Natural armor protects as normal). The target takes 3d6 necrotic damage, and you gain half the damage delt as temporary hiy points. While wielding the scythe, you have disadvantage on charisma checks made to interact with living, good and neutral-aligned creatures.