General | Combat Stamina
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Untwisting Iron Skin (Combat) Source Adventurer's Guide pg. 107, Inner Sea Combat pg. 13 Your training has tempered your flesh to resist blows as though it were forged iron. Prerequisites: Str 15; Wis 13; Perfect Style; Toughness; Untwisting Iron Strength; base attack bonus +13 or monk level 13th. Benefit: When using Perfect Style, you gain an amount of DR/adamantine equal to 1/3 your character level (maximum 6). Additionally, whenever you break an item with a hardness of 10 or more, you gain DR 1/— for a number of rounds equal to half the item’s hit points (maximum 10 rounds); the value of this damage reduction increases by 1 for every 5 points of hardness above 10 the broken item had. You can spend 1 ki point as a swift action to double either of the damage reduction values granted by this feat 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 Skin.

Untwisting Iron Skin (Combat)

Source Adventurer's Guide pg. 107, Inner Sea Combat pg. 13
Your training has tempered your flesh to resist blows as though it were forged iron.

Prerequisites: Str 15; Wis 13; Perfect Style; Toughness; Untwisting Iron Strength; base attack bonus +13 or monk level 13th.

Benefit: When using Perfect Style, you gain an amount of DR/adamantine equal to 1/3 your character level (maximum 6). Additionally, whenever you break an item with a hardness of 10 or more, you gain DR 1/— for a number of rounds equal to half the item’s hit points (maximum 10 rounds); the value of this damage reduction increases by 1 for every 5 points of hardness above 10 the broken item had. You can spend 1 ki point as a swift action to double either of the damage reduction values granted by this feat 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 Skin.

Archives of Nethys

Untwisting Iron Skin (Combat)

Combat Trick (from the Combat Stamina feat)