Confirmed Rare: Twin Pillars of Justice — a Crimson Rams ceremonial pair.
"These weapons have little to do with justice and they certainly aren't pillars, but the Crimson Rams have a taste for metaphors."
Your Attacks and Weapon Skills generate a stack of Zeal (up to 10). At 10 stacks, your next Final Combo Attack consumes all stacks to reset a Weapon Skill cooldown and increase its damage.