Geological team leader Yang Zhiyuan discovers a mysterious fissure in the Kunlun Mountains lost zone, delves into the frozen ancient city, and unearths the truth of the Capital Below the Emperor. Beneath the nine-layered black pagoda is imprisoned an ancient beast sealed for hundreds of millions of years, and the seal is crumbling. The Gobi desert small town of Jinyuan bears the brunt; defender Chen Ye and Lao Zhou guard the city walls to the death, while troops Lin Zheng and Zhao Weijiang are ordered to blockade, and scholars Shen Qingli and Zheng Weishan trace the truth following the Chu Silk Manuscripts. The Yayu, Kaiming Beast, and other eight vicious beasts break the seal one after another, with beast tides rolling over towns and defense lines, as sacrifice and betrayal intertwine. Myth becomes reality, and humanity is left with only its final line of defense. Before dawn, everyone must make a choice.