Desperate Wrath
Feat 16
Source Pathfinder Player Core 2
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
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
BarbarianThis indicates abilities from the barbarian class.
RageYou must be raging to use abilities with the rage trait, and they end automatically when you stop raging.