The Four Peak Treasure House referred to the four arsenals that the Yan Monarch desperately carried away, despite being seriously injured by Qin Fangtian in the closing stages of the Immortal Mountain war. These arsenals contained numerous cultivation resources that could be used for the revitalization of the Qingqian forces.
Jing Ji somehow managed to extricate himself from the quagmire of Qingqian and had been absorbed into the capital's administration. He even took away the Four Peak Treasure House, using it as a bargaining chip for survival.
Frankly, Lu Bei was very interested in the Four Peak Treasure House, but concerning the person Jing Ji...
Jing Ji has vision, measures, knows when to proceed or retreat, and is completely shameless, which made him a rare talent among the Nine Sword Elders.