General | Combat Stamina
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Crushing Blow (Combat) Source Ultimate Combat pg. 94 Your focus allows you to smash your enemy’s defenses. Prerequisites: Improved Unarmed Strike, Stunning Fist. Benefit: You can make a Stunning Fist attempt as a full-round action. If successful, instead of stunning your target, you reduce the target’s AC by an amount equal to your Wisdom modifier for 1 minute. This penalty does not stack with other penalties applied due to Crushing Blow. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 116 When using this feat, you can spend either 2 or 4 stamina points. If you do, the Crushing Blow attack reduces the target’s AC by an additional 1 for every 2 stamina points you spent.

Crushing Blow (Combat)

Source Ultimate Combat pg. 94
Your focus allows you to smash your enemy’s defenses.

Prerequisites: Improved Unarmed Strike, Stunning Fist.

Benefit: You can make a Stunning Fist attempt as a full-round action. If successful, instead of stunning your target, you reduce the target’s AC by an amount equal to your Wisdom modifier for 1 minute. This penalty does not stack with other penalties applied due to Crushing Blow.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 116
When using this feat, you can spend either 2 or 4 stamina points. If you do, the Crushing Blow attack reduces the target’s AC by an additional 1 for every 2 stamina points you spent.

Archives of Nethys

Crushing Blow (Combat)

Combat Trick (from the Combat Stamina feat)