Ironskin

Ironskin
Transmutation [metal]
Level 2 (simple)
Casting Time 1 standard action
Components V, S, M (a pinch of forge soot)
Range personal
Target you
Duration 1 minute/level (D; see text).

You gain a +4 enhancement bonus to your existing natural armor bonus. This enhancement bonus increases by 1 for every 4 caster levels above 4th, to a maximum of +7 at 15th level. While you’re under the effects of this spell, if an opponent confirms a critical hit or sneak attack against you with a physical weapon (not a spell or magical effect), you can dismiss this spell to negate the critical hit or sneak attack and treat it is as a normal hit.

OPEN GAME LICENSE Version 1.0a - All text is Open Game Content.