Pious Defense( Complete Divine, p. 86)
Your connection to a greater power sometimes gives you fl ashes of insight that keep you safe.
Knowledge (religion) 2 ranks,
When you would be reduced to 0 hit points or less by damage, you can spend 1 faith point to take only half damage.
When chosen, this feat gives you 4 faith points, and you may earn additional faith points as outlined in the Faith Feats section.