Book of Vile Darkness 3.5
By Monte Cook
Conjuration (Creation) [Evil]
The caster summons evil energy from the Nine Hells and bathes himself in its power. The caster gains a +2 deflection bonus to Armor Class, as well as an upgrade of his existing damage reduction by /+1 (DR 10/+1 becomes DR 10/+2, for example).
Material Component: The heart of an elf child.