General | Combat Stamina
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Tiring Critical (Combat, Critical)

Source PRPG Core Rulebook pg. 135
Your critical hits cause opponents to become fatigued.

Prerequisites: Critical Focus, base attack bonus +13.

Benefit: Whenever you score a critical hit, your opponent becomes fatigued. This feat has no additional effect on a fatigued or exhausted creature.

Special: You can only apply the effects of one critical feat to a given critical hit unless you possess Critical Mastery.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 134
When you threaten a critical hit against a fatigued foe, you can spend 5 stamina points before attempting the confirmation roll. If you confirm the critical hit, the foe becomes exhausted.