Tomb-Tainted Soul
(Libris Mortis: The Book of the Dead, page 31, DnD 3.5)
[General]
Your soul is tainted by the foul touch of undeath.
Prerequisite
Nongood alignment
Benefit
You are healed by negative energy and harmed by positive energy as if you were an undead creature. This feat gives no other penalties or benefi ts of the undead type.