(Armor Mastery, Combat)
You are able to quickly react to attacks.
Prerequisites
Combat Reflexes,
Ironclad Reactions, base attack bonus +11 or
Fighter level 8th, armor training class 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.