Source: Book of Exalted Deeds
You have taken a sacred vow to avoid contact with dead flesh
Prerequisite: Sacred Vow.
Benefit: You gain a +4 perfection bonus on Fortitude saving throws to resist disease and death effects.
Special: To fulfill your vow, you must avoid all contact with dead creatures, including meat cooked for food. You may not touch fallen foes. You may fight undead foes, but must purify yourself as soon as possible afterward. You may touch dead characters in order to restore them to life (by way of a raise dead or similar spell that requires you to touch the corpse), but for no other purpose.
If you fight undead creatures or accidentally touch dead flesh you must purify yourself in a special ritual that requires 1 hour and a flask of holy water.
If you intentionally break your vow, you immediately and irrevocably lose the benefit of this feat. You may not take another feat to replace it. If you break your vow as a result magical compulsion, you lose the benefit of this feat until you perform a suitable penance and receive an atonement spell.