A frustrated city planner, a quick hike in Bashan, and an ancient salt spring that had been forgotten for thousands of years - Shen Yan's life completely changed the moment he touched the spring water. The snake pattern that appeared on his left arm drew him into an ancient secret that spanned the realms of yin and yang.
From the abandoned salt city in Wuxi, Chongqing, to the Linjun Tomb deep in Shennongjia; from the Hebo Water Mansion at the bottom of the Zigui River to the Yaochi Shrine in the Western Sichuan Plateau; from the projection of Kunlun Ruins in Siguniang Mountain to the thousand-year-old underground city at the foot of Tianmen Mountain - Shen Yan traveled together with Chu Zhao, a graduate student in the Department of Archeology, and Ba Jiu, a folk warlock, and followed the guidance of the fragments of the "Shan Hai Jing" and Bachu witchcraft culture to uncover the truth about the fall of the ancient gods step by step.
Twelve lost ancient witchcraft, a seal formation covering the three lands of Bachu and Shu, a mysterious organization that has been hidden for thousands of years, and a battle to return to ruins that is related to the survival of civilization. When the night rain falls again on Bashan, he must make a choice: return to ordinary life, or sacrifice himself to protect the memory of this land?