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Knockback 
Feat 10
Source Pathfinder Core Rulebook
Requirements Your last action was a successful Strike
The weight of your swing drives your enemy back. You push the foe back 5 feet, with the effects of a successful Shove. You can follow the foe as normal for a successful Shove.
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.
RageYou must be raging to use abilities with the rage trait, and they end automatically when you stop raging.