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There is a Legacy version here.

PFS StandardResounding Blow [two-actions] Feat 10

Barbarian 
Source Player Core 2 pg. 82 1.1

Requirements You are wielding a melee weapon that deals bludgeoning damage.

You strike your enemy in the head with such force that its ears ring. Make a melee Strike. If the Strike hits and deals damage, the target is deafened until the start of your next turn (or for 1 minute on a critical hit).