Oath of Unbreakable Devotion (3.5e Feat)
From D&D Wiki
Oath of Unbreakable Devotion [General, Fighter,]
You take an oath to the Divine Energies and gain an aspect of a God.
Prerequisite: Strength 33, Wisdom 21. You must worship a Deity with Divine Rank 15. You must also have at least 4 levels in a religious class, and have a DR of 5.
Benefit: You increase your DR by 1/2 of your characters' level (minimum of 1). Additionally, you don't fall unconscious, or die, until your hit points reach, or surpass the negative equivalent of your wisdom score.
Normal: No DR or ability.