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There is a Legacy version here.

PFS StandardFurious Finish [one-action] Feat 2

Barbarian Rage 
Source Player Core 2 pg. 77

Desperate to finish the fight, you pour all your rage into one final blow. Make a Strike. If it hits, you gain a circumstance bonus to damage equal to the number of rounds remaining in your Rage (maximum 10). After this Strike, your Rage immediately ends, and you are fatigued until you rest for at least 10 minutes.

Traits

Rage:

You must be raging to use abilities with the rage trait, and they end automatically when you stop raging.