Arcane Armor Mastery (Feat)

You have mastered the ability to cast spells while wearing armor.

Prerequisites: Caster Level 7, Arcane Armor Training (Feat), Armor Proficiency, Medium (Feat)

Benefit: As a swift action, reduce the arcane spell failure chance due to the armor you are wearing by 20% for any spells you cast this round. This bonus replaces, and does not stack with, the bonus granted by Arcane Armor Training (Feat).