General | Combat Stamina
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Porcupine Defense

Source Armor Master's Handbook pg. 21
Related Feat Porcupine Defense
You can spend 5 stamina points to make an attack of opportunity against an opponent at least one size category larger than you if that opponent attempts a combat maneuver check against you. You can perform this attack of opportunity even if your opponent can attempt such combat maneuvers without normally provoking attacks of opportunity. (Dragonslayer’s Handbook 25)

Archives of Nethys

Porcupine Defense