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Renewed Vigor 
Feat 8
Source Pathfinder Core Rulebook
You pause to recover your raging vigor. You gain temporary Hit Points equal to half your level plus your Constitution modifier.
Effect: Renewed Vigor
Traits
Common
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.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
RageYou must be raging to use abilities with the rage trait, and they end automatically when you stop raging.