A blood-stained Khitan jade pendant endowed him with great energy and involved him in a life-and-death mystery that spanned Europe and Asia. Genghis Khan's mausoleum is not the end, but a prison where the ancient "mysterious heritage" is imprisoned. Once opened, civilization will fall into eternal night.
Forced to follow the guidance of the "Secret History of Mongolia" and Yelu Chucai's Notes with the mysterious female tomb keeper, they headed towards the holy mountains of Mongolia. However, the pursuit from the "Eternal Life Sky" follows closely, and there is a hidden murderous intention within the expedition team.
After successfully passing through the death trial composed of the four elements, they finally stepped into the underground palace, only to find that it was a miniature empire built of bones and trophies.
When the sleeping "legacy" - the inhuman remains is about to be awakened, an ultimate decisive battle concerning the fate of the world suddenly breaks out.
