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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.