The Shadow Luan Sword in "Dynasty Warriors: Origins" is a graduation weapon among the sword weapons in the game. To obtain this sword, you first need to reach level 80 and have a good epic weapon. To obtain The Sword of the Peacekeeper is mostly just needed to re-challenge the final mission of Chapter 1.
How to get the Shadow Luan Sword in Dynasty Warriors Origin
Shadow Luan is the ultimate weapon that is relatively easy to obtain. As long as you're at least level 80 and have a decent epic weapon, getting the Peacekeeper's Sword is mostly just a matter of re-challenging the final mission of Chapter 1.
All you need to do is defeat Zhang Bao's huge army within 15 minutes of the mission starting. The map is large and maze-like, so choose your battles well. Make sure to defeat Zhou Cang on the west side of the map and Zhang Liang in the northeast corner within about 10 minutes so you can ensure you have as many allies as possible to support the main attack.
Although you need to defeat Zhang Bao after destroying Zhang Bao's army to complete the mission and receive rewards, you do not need to continue with the subsequent Zhang Jiao boss battle.