Demonflesh(Fiendish Codex I: Hordes of the Abyss)
Level: Blackguard 1, Demonic (FC1) 1,
Components: V, S,
Casting Time: 1 standard action
Duration: 1 minute/level
Your flesh becomes thick and leathery like a demon's.
This spell grants you a +1 enhancement bonus to your natural armor for every five caster levels you possess (minimum +1, maximum +4).
A creature without natural armor has an effective natural armor bonus of +0.