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There is a Legacy version here.

PFS StandardSupernatural Senses Feat 4

Barbarian Rage 
Source Player Core 2 pg. 78
Prerequisites Acute Scent, or scent

Your scent is preternaturally sharp, and you can always rely on your sense of smell to help guide you when your vision is compromised. When you target a concealed or hidden opponent while you are raging, you reduce the DC of the flat check to 3 for a concealed target or to 9 for a hidden one.

Traits

Rage:

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