Demonhide

(Spell Compendium, page 63, DnD 3.5)

Abjuration[Evil]

Level: ; Blackguard 2
Components: V, S
Casting Time: 1 standard action
Range: Touch
Target: Evil creature touched
Duration: 1 round/level
Saving Throw: Will negates (harmless)
Spell Resistance: Yes (harmless)

You touch your minion with your holy symbols and invoke the horrid words of the lower planes. A fiery glow spreads across your servant's skin, leaving it with a deep red luster.

The subject gains damage reduction 5/cold iron or good.