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There is a Legacy version here.

PFS StandardVicious Vengeance Feat 1

Uncommon Champion 
Source Player Core 2 pg. 94
Prerequisites iniquity cause

While your vengeance is painful for both you and your foe, none can doubt that your enemies suffer more. You gain a circumstance bonus to the damage you deal from Destructive Vengeance equal to the number of damage dice from the reaction. This applies to only the damage the enemy takes, not the damage to yourself or the extra damage you gain after using the reaction.

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.