The Condor Trilogy (射鵰三部曲) is a series of three wuxia novels written by Hong Kong–based Chinese writer Jin Yong (Louis Cha).
Concurrently, Mongol tribes led by Temüjin (Genghis Khan) emerge as a rising power in the north.
The third and last novel, The Heaven Sword and Dragon Saber, is set in the late Yuan dynasty (founded by the Mongols).
Guo Jing fights with Ouyang Feng to prevent him from stealing the book, but is severely wounded when Yang Kang betrays and stabs him.
In the sequel, the adult Guo Jing dedicates his life to defending the Song Empire from foreign invasion.
Guo uses the tactics from the Book of Wumu, his understanding of Mongol warfare, Xiangyang's natural barriers (the Han River waterways and the surrounding mountains), and his allies from the wulin (martial artists' community) to counter the invaders for 46 years.
However, after the loss of a nearby fortified city Fancheng, Guo Jing eventually dies a martyr when Xiangyang finally falls to the Mongols.
Nearly a century after the Battle of Xiangyang, the Dragon Slaying Saber is taken by Xie Xun after it is found by the Heavenly Eagle Cult.
Zhou breaks the weapon by clashing it against the Heaven Reliant Sword, and the items hidden in the blades are revealed.