Piao Yu, the master forger Wu Yuzi searched for thousand-year-old cold iron, broke the thousand-year-old black ice on the snowy mountain top into water, and spent six years and three months to forge this blade. The blade is more than a foot long and an inch and a half wide. On the day the weapon was completed, the sky and the earth changed, thunder and lightning roared, and Wu Yuzi looked up to the sky and laughed wildly: I will spend the rest of my life making this weapon, and I will have no regrets! He vomited blood and died - "The Battle of Rivers and Lakes - Instruments"