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There is a Legacy version here.

PFS StandardSupernatural Senses Feat 4

Barbarian Rage 
Source Player Core 2 pg. 78

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.