Armor (shield), very rare
While holding this shield, you automatically succeed on saving throws against necromancy spells and other effects caused by necrotic damage (such as a Specter’s Life Drain). You also have resistance to necrotic damage.
As a bonus action, you can lay this shield over a creature that is making Death saves to grant it advantage on death saves. When you are reduced to 0 hit points, you can use your reaction to make a DC 13 Dexterity check to lay the shield on yourself.