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From Pathfinder #220: Crypt of Runes, which isn't enabled.

Avenger of Wrath

FEAT 14

You've become a champion of the runelords of wrath. You gain the Reactive Strike reaction. The first time each day you score a critical hit with a Reactive Strike, you gain 1 Mythic Point. You gain the Host of Wrath activity.

Pathfinder #220: Crypt of RunesORC