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Arcane Armor Mastery (Combat)

Source PRPG Core Rulebook pg. 118
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.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 113
When casting a spell while wearing armor, you can spend 1 stamina point to activate Arcane Armor Mastery as a free action, or spend a number of stamina points equal to the spell’s level (minimum 1) to ignore your armor’s arcane spell failure chance entirely for that casting.