Naath-Tryst

You target a weakened undead, spirit, or supernatural creature within range that has less than half its maximum hit points. The target must make a Constitution saving throw. On a failed save, it takes 8d6 radiant damage, and if reduced to 0 hit points, its essence is consumed, killing it instantly. You then gain one of the following benefits for 1 minute: Vitality: Regain hit points equal to half the target's maximum hit points. Arcane Renewal: Regain a spell slot of 5th level or lower. Supernatural Strength: Gain advantage on attacks, saves, and resistance to all damage. On a successful save, the target takes half damage but is not consumed. Creatures killed by this spell cannot be resurrected by any means short of Wish.