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Greater Ironclad Reactions (Armor Mastery, Combat)

Source Armor Master's Handbook pg. 16
You are able to quickly react to attacks.

Prerequisites: Combat Reflexes, Ironclad Reactions, base attack bonus +11 or fighter level 8th, armor trainingclass feature, proficiency with medium armor.

Benefit: You can use Ironclad Reactions more than once per round, but not more than once for each act you take that provokes an attack of opportunity. Each 5-foot step you take still counts as expending one use of an attack of opportunity.

Combat Trick

Source Armor Master's Handbook pg. 20 (Amazon)
You can spend 5 stamina points to use this feat without it counting against your maximum number of attacks of opportunity for that round. (See page 16.)