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.
Prerequisites: 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.
Source: Player’s Handbook II, page 88.