PFSRD:Arcane Armor Mastery
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Arcane Armor Mastery (Combat)
You have mastered the ability to cast spells while wearing armor.
Prerequisites: Arcane Armor Training, Medium Armor Proficiency, caster level 7th.
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.