Ironskin
School transmutation [earth]; Level alchemist 2, antipaladin 2, bloodrager 2, cleric 2, druid 2, paladin 2, psychic 2, ranger 2, witch 2
CASTING
Casting Time 1 standard action
Components V, S, DF/M (a pinch of forge soot)EFFECT
Range personal
Target you
Duration 1 minute/level (D; see text)DESCRIPTION
Your skin hardens and takes on the color and texture of rough iron.
You gain a +4 enhancement bonus to your existing natural armor bonus (if you do not have a natural armor bonus, you are considered to have an effective natural armor bonus of +0).
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. Dismissing the spell in this way is not an action, but you must be conscious and aware of the attack to do so.
Note*: The math is incorrect in the spell description, and should cap at 16th level. Though there’s been some dialogue about whether the prior change to 16th level or if the bonus is to iterate at “every 4 caster levels above 3rd” (like admonishing ray, scorching ray, etc), no update from Paizo has been provided.
It doesn't say that having skin is a requirement for the spell, but the fluff text says your skin hardens. It could go either way depending on how strict your GM is, but personally, I'd allow it.
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Just note that the Ironskin spell grants a ridiculously high AC bonus, is not PFS legal, and I believe was intended to be exclusive to the Duergar, so personally I'd say you can't cast it even if you do have skin...
I would say as long you have a skin analog it probably works.
As a GM I might not let skeletons use it.
Of course, I'm not in the habit of letting players play as things that don't have skin (or at least skin analogs).
And if you're the GM trying to design enemies, don't worry about the rules. Just create the monster the way you want it to be.
If you are a player, check with your GM anyways. Regardless of what the rules might say your GM might take issue regardless. Or course, if you're playing a skeleton or construct your GM might not care and just find a different way to counter it.