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Twist the Knife 
Feat 6
Source Pathfinder Core Rulebook
Requirements Your last action was a melee Strike that dealt sneak attack damage to a Flat-Footed target
After stabbing your opponent in a weak spot, you tear the wound open. You deal Persistent Bleed Damage to the target equal to your number of sneak attack damage dice.
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.
RogueThis indicates abilities from the rogue class.