General | Combat Stamina
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Untwisting Iron Strength (Combat) Source Adventurer's Guide pg. 107, Inner Sea Combat pg. 13 You are a master at breaking even the toughest of objects. Prerequisites: Str 15; Wis 13; Perfect Style; base attack bonus +9 or monk level 9th. Benefit: When using Perfect Style, your attacks ignore an amount of hardness equal to your character level. Additionally, you gain a +4 bonus on Strength checks to break objects. If you spend 1 ki point as a swift action, you also gain the benefits of Improved Sunder for 1 round. Combat Trick (from the Combat Stamina feat) Source Weapon Master's Handbook pg. 25 You can spend 2 stamina points instead of 1 ki point when using Untwisting Iron Strength.

Untwisting Iron Strength (Combat)

Source Adventurer's Guide pg. 107, Inner Sea Combat pg. 13
You are a master at breaking even the toughest of objects.

Prerequisites: Str 15; Wis 13; Perfect Style; base attack bonus +9 or monk level 9th.

Benefit: When using Perfect Style, your attacks ignore an amount of hardness equal to your character level. Additionally, you gain a +4 bonus on Strength checks to break objects. If you spend 1 ki point as a swift action, you also gain the benefits of Improved Sunder for 1 round.

Combat Trick (from the Combat Stamina feat)

Source Weapon Master's Handbook pg. 25
You can spend 2 stamina points instead of 1 ki point when using Untwisting Iron Strength.

Archives of Nethys

Untwisting Iron Strength (Combat)

Combat Trick (from the Combat Stamina feat)