Ran into this little issue today during our weekly play.
Warpriest (a dwarf) can use any spell from the Cleric Spell list, and had chosen Ironskin to use.
GM claims that he can't use it because it is a "Duergar" race specific spell.
I looked up the spell in the Monster Codex which is the only place I could find it listed. It says,
The following spells are known and were likely developed by duergar spellcasters.``````
School transmutation [earth]; Level alchemist 2, antipaladin 2, bloodrager 2, cleric 2, druid 2, paladin 2, ranger 2, witch 2
Casting Time 1 standard action
Components V, S, DF/M (a pinch of forge soot)
Duration 1 minute/level (D; see text)
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.````````
What do you guys think? I have no dog in this fight but think the Warpriest should be able to use it. Anyone else ran into this issue before? It is pretty open ended in my opinion.