Arcane Armor Mastery
You have mastered the ability to cast spells while wearing armor.
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.
Endzeitgeist Says: Same as Arcane Armor Training, though at 20%, we're starting to see significant benefits - not a perfect use for two feats, but a flavorful choice.