(General)
You become harder to kill when possessed by the undead.
Prerequisites
Spell Focus (necromancy).
Benefit
Whenever you are possessed by an undead creature that you do not directly control, you gain a +4 bonus on saving throws against death effects. You don't fall
Unconscious at negative hit points, and if you or the undead possessing you is forced to attempt a saving throw to resist ending the possession effect, you or your possessor gains a +4 bonus on the saving throw.