Demonflesh

(Fiendish Codex I: Hordes of the Abyss, DnD 3.5)

Transmutation[Evil]

Level: ; Blackguard 1; , Demonic 1
Components: V, S
Casting Time: 1 standard action
Range: Personal
Target: You
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.