From Pathfinder Battlecry!, which isn't enabled.

Saving Slash

FEAT 10

Activity reaction

Trigger An opponent critically hits you with a melee attack.

You quickly whirl your blade, trying to deflect enough momentum to avoid the worst of the attack. Attempt a DC 15 flat check. If you succeed, the attack becomes a normal hit, instead of a critical hit.

Pathfinder Battlecry!ORC