Metal Mystery

Upon reaching 20th level, you become a master of iron and steel. You gain the benefits of Weapon Focus, Greater Weapon Focus, and Improved Critical with any one metal weapon that you are proficient with. Your armor is like a second skin to you—while wearing metal armor you are proficient with, the armor's maximum Dexterity bonus increases by +5 and you take no armor check penalty. In addition, any metal you create with your magic (such as wall of iron) has its hardness increased by +10.