Undead Fortitude

You don't need to eat, breath or sleep. Regular food have a bad taste for you. You don't feel pain and is now considered as an undead creature and you see beauty on death. If damage reduces the player to 0 hit points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the player drops to 1 hit point instead.