Your partially-constructed body can merge with your armor, making it as much a part of you as your mineral skin. As you master combat and war, your body begins to further integrate your armor, allowing you to master it to a degree no other warrior ever could.
Armor Aptitude (Ex)
Starting at 2nd level, an ironborn learns to be more maneuverable while wearing armor. Whenever he is wearing armor, he reduces the armor check penalty by 1 (to a minimum of 0) and increases the maximum Dexterity bonus allowed by his armor by 1. Every four levels thereafter (7th, 11th, and 15th), these bonuses increase by +1 each time, to a maximum –4 reduction of the armor check penalty and a +4 increase of the maximum Dexterity bonus allowed.In addition, an ironborn can also move at his normal speed while wearing medium armor. At 7th level, an ironborn can move at his normal speed while wearing heavy armor.
Iron Fists (Ex)
Beginning at 2nd level, the ironborn gains two slam attacks whenever he is wearing medium or heavy armor. These slam attacks deal 1d6 points of damage each and are considered primary natural attacks.
This ability replaces the bonus feat normally gained at 2nd level.
Durable Plating (Ex)
At 3rd level, as long as the ironborn is wearing medium or heavy armor, he gains DR 1/-. This damage reduction increases by 1 every four levels thereafter, to a maximum of DR 5/- at 19th level. The damage reduction gained from durable plating stacks with that gained from adamantine armor.
This ability replaces armor training.
Always Armored (Ex)
At 4th level, the ironborn can sleep in any armor without being fatigued. This ability replaces the bonus feat normally gained at 4th level.
Fusing of Man and Metal (Ex)
At 8th level, as long as the ironborn is wearing medium or heavy armor, the armor bonus to AC is increased by 1. This bonus increases by 1 every four levels thereafter.
This ability replaces the bonus feat normally gained at 8th level.
At 19th level, any time the ironborn’s armor is targeted by a sunder attempt or would otherwise take damage, the damage is instead transferred to the ironborn. Any applicable hardness of the armor is applied before determining what (if any) damage is transferred to the ironborn.
This ability replaces armor mastery.
Ultimate Psionics, © 2013, Dreamscarred Press; Authors: Andreas Rönnqvist, Jeremy Smith.