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Precise Strike (Combat, Teamwork)

Source Advanced Player's Guide pg. 167
You are skilled at striking where it counts, as long as an ally distracts your foe.

Prerequisites: Dex 13, base attack bonus +1.

Benefit: Whenever you and an ally who also has this feat are flanking the same the creature, you deal an additional 1d6 points of precision damage with each successful melee attack. This bonus damage stacks with other sources of precision damage, such as sneak attack. This bonus damage is not multiplied on a critical hit.

Combat Trick

Source Pathfinder Unchained pg. 129
When dealing precision damage with this feat, you can spend 2 stamina points to increase that precision damage to 2d6.