Instrument of Slaughter
FEAT 16 champion's reaction that grants extra damage with your Strikes (including the desecration, iniquity, and obedience causes)
Your blessed armament thirsts for the blood of your foes. Whenever you critically hit an enemy with a Strike that has the extra damage from your champion's reaction, the target also takes persistent bleed damage equal to two of the weapon's damage dice.
Pathfinder Player Core 2ORC