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Knight's Retaliation 
Feat 8
Source Pathfinder Lost Omens: Knights of Lastwall
Prerequisites trained in Athletics
Trigger An undead creature within your reach critically fails a Strike against you.
You knock the enemy's blow aside and twist, unbalancing your foe. You attempt to Disarm, Shove, or Trip the triggering creature.
Traits
Uncommon
Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
FighterThis indicates abilities from the fighter class.
SwashbucklerThis indicates abilities from the Swashbuckler class.