tvinter warmage archetype from koboold press

[drakahn99]

tvinter warmage grants an ability that grants proficiency in a weapon if its made of cold iron and removes the arcane penalty for light armor that is made from cold iron, i went ahead and created a cold iron material for the armor. however is there any way to have the ability to check to see if equipped armor or weapons are made from cold iron?

any help would be appreciated as im at a loss for how to approach this.

[Aaron]

It looks like armor and weapons gain the HasAbility tags for any material they contain, so you can look at those.