Death Armor

Source: Forgotten Realms Heroes of the Forgotten

2nd Level Necromancy (Sorcerer, Wizard)

Casting Time: Action Range: Touch Components: V, S, M (an onyx worth at least 50 gp, which the spell consumes) Duration: 1 hour

For the duration, an inky aura surrounds one creature you touch. The target has Advantage on Death Saving Throws, and once per turn, when a creature within 5 feet of the target hits it with a melee attack roll, the attacker takes 2d4 Necrotic damage.