Amulet of the Lost Soul

While attuned, if the wearer drops to 0 they immediatly gain 2d8+2 hit points back preventing them from fallin unconcious. This effect may only be used once per long rest. After using this items effect, roll a d20. On a 1-4 the amulet releases a death rasp and the Lost Soul is released rendering the amulet mundane.