Tattoo of Death Ward

Wondrous item (tattoo), rare (requires attunement)

The first time you would drop to 0 hit points as a result of taking damage, you instead drop to 1 hit point, and the tattoo disappears. If the tattoo is still in effect when you are subjected to an effect that would kill you instantaneously without dealing damage, that effect is instead negated against you, and the tattoo disappears.