General | Combat Stamina
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Rending Fury (Combat) Source Ultimate Combat pg. 116 You easily tear your enemies limb from limb with your natural attacks. Prerequisites: Base attack bonus +6, rend special attack. Benefit: You deal rend damage if you hit with half the normal natural attacks your rend requires. For example, a troll that has this feat can rend when it hits with one claw attack, while a girallon that has this feat must hit one target with two claw attacks to rend. You can only make this rend attack once per round. Combat Trick (from the Combat Stamina feat) Source Pathfinder Unchained pg. 130 When you make a rend attack, you can spend up to 5 stamina points to deal an amount of additional damage equal to double the number of stamina points you spent.

Rending Fury (Combat)

Source Ultimate Combat pg. 116
You easily tear your enemies limb from limb with your natural attacks.

Prerequisites: Base attack bonus +6, rend special attack.

Benefit: You deal rend damage if you hit with half the normal natural attacks your rend requires. For example, a troll that has this feat can rend when it hits with one claw attack, while a girallon that has this feat must hit one target with two claw attacks to rend. You can only make this rend attack once per round.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 130
When you make a rend attack, you can spend up to 5 stamina points to deal an amount of additional damage equal to double the number of stamina points you spent.

Archives of Nethys

Rending Fury (Combat)

Combat Trick (from the Combat Stamina feat)