Divine Armor

(Player's Handbook II, page 88, DnD 3.5)

[Divine]

You call upon your deity to protect you in your hour of need by wreathing you in divine power that wards off your enemies' attacks.

Prerequisite

Divine caster level 5th, ability to turn or rebuke undead

Benefit

As a swift action, you can expend a turn or rebuke undead attempt to gain damage reduction 5/- until the start of your next turn.