Ulthar's Deathward Embrace

You touch a creature, granting it protection against death. The first time the creature drops to 0 hit points during the spell’s duration, it is instead reduced to 1 hit point. The spell also grants resistance to necrotic damage for the duration. after this happens once, the spell fades and is dispelled.

At Higher Levels: When cast using a spell slot of 4th level or higher, you can target one additional creature for each slot level above 3rd.