Tomb-Born Vitality

 
Prerequisite(s): Tomb Tainted Soul, Non Good Alignment.
 
Benefit: You do not need to sleep, and you are immune to magic sleep effects. If you are a spellcaster, you still require 8 hours of uninterrupted rest (but not sleep) to prepare your spells. In addition, you no longer need to eat. Your body grows unnaturally thin, your flesh stretching tightly over your bones to give you a freakish, skeletal appearance.
 
Source: Libris Mortis: The Book of the Dead