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There is a Legacy version here.

PFS StandardTerrifying Howl [one-action] Feat 10

Auditory Barbarian Rage 
Source Player Core 2 pg. 82

You unleash a terrifying howl. Attempt Intimidation checks to Demoralize each enemy within 30 feet: you don't take a penalty if the creature doesn't understand your language. Regardless of the results of your checks, each target is then temporarily immune to Terrifying Howl for 1 minute.

Traits

Auditory:

Auditory actions and effects rely on sound. An action with the auditory trait can be successfully performed only if the creature using the action can speak or otherwise produce the required sounds. A spell or effect with the auditory trait has its effect only if the target can hear it. This applies only to sound-based parts of the effect, as determined by the GM. This is different from a sonic effect, which still affects targets who can’t hear it (such as deaf targets) as long as the effect itself makes sound.

Rage:

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