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Arcane Armor Training (Combat)

Source PRPG Core Rulebook pg. 118
You have learned how to cast spells while wearing armor.

Prerequisites: Light Armor Proficiency, caster level 3rd.

Benefit: As a swift action, reduce the arcane spell failure chance due to the armor you are wearing by 10% for any spells you cast this round.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 114
When casting a spell while wearing armor, you can spend 1 stamina point to activate Arcane Armor Training as a free action.

Mythic Arcane Armor Training

Source Mythic Adventures pg. 55
You’ve adapted your spellcasting to overcome limitations of wearing armor.

Prerequisites: Arcane Armor Training.

Benefit: You don’t have to spend a swift action to gain the reduction to arcane spell failure chance from Arcane Armor Training. Furthermore, if you’re wearing light armor, reduce your arcane spell failure chance by 20%.