General | Combat Stamina
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Butterfly's Sting (Combat) Source Inner Sea Gods pg. 208, Faiths of Purity pg. 24 You can forgo a critical hit in order to pass it on to an ally. Prerequisites: Combat Expertise, worshiper of Desna. Benefit: When you confirm a critical hit against a creature, you can choose to forgo the effect of the critical hit and grant a critical hit to the next ally who hits that creature with a melee attack before the start of your next turn. Your attack only deals normal damage, and the next ally to hit the target automatically confirms the attack as a critical hit. Combat Trick (from the Combat Stamina feat) Source Weapon Master's Handbook pg. 24 When you confirm a critical hit, you can spend 10 stamina points to use Butterfly’s Sting without forgoing your own critical hit.

Butterfly's Sting (Combat)

Source Inner Sea Gods pg. 208, Faiths of Purity pg. 24
You can forgo a critical hit in order to pass it on to an ally.

Prerequisites: Combat Expertise, worshiper of Desna.

Benefit: When you confirm a critical hit against a creature, you can choose to forgo the effect of the critical hit and grant a critical hit to the next ally who hits that creature with a melee attack before the start of your next turn. Your attack only deals normal damage, and the next ally to hit the target automatically confirms the attack as a critical hit.

Combat Trick (from the Combat Stamina feat)

Source Weapon Master's Handbook pg. 24
When you confirm a critical hit, you can spend 10 stamina points to use Butterfly’s Sting without forgoing your own critical hit.

Archives of Nethys

Butterfly's Sting (Combat)

Combat Trick (from the Combat Stamina feat)