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There is a Legacy version here.

PFS StandardDesperate Wrath [free-action] Feat 16

Barbarian Rage 
Source Player Core 2 pg. 84
Trigger Your turn begins, and your current Hit Points are at half your maximum or less.

Your blood boils when you take a beating, and you throw caution to the wind to finish the fight. You get a +2 circumstance bonus to attack rolls, a –1 penalty to AC, and a –1 penalty to saves. These bonuses and penalties last until your Rage ends or until you are above half Hit Points, whichever comes first.

Traits

Rage:

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