Fate Breaker

Weapon Magical, Versatile Legendary (this item requires attunement) [Divination]

A long sword three and a half feet in length made from a greenish blue metal with its name written in runes on the blade. once per day if the wielder is hit with a attack that would kill them they would instead be left with 1d4+2 points of health. If the user fails 3 death saves than their health is brought to 1 but is rendered unconscious. Finally if wielded by a strong enough wielder(lvl. 18-20) the blade give the user immunity to attacks or manipulation from god level beings.