The Classic of Mountains and Seas is not a collection of myths, but a true record of the ancient civilization of the "Age of the Gods." The so-called "spiritual energy" is actually a form of higher-dimensional radiation called "Wilderness Energy," while strange beasts are mutated creatures adapted to this environment. The Great Wilderness is a folded subspace that is gradually overlapping with the real world. By decoding the gene sequences of strange beasts, known as totem patterns, humans can transform parts of their bodies into those of the beasts and gain their strength. But excessive use carries the risk of losing control to beastification.
Qin Mu, a restorer of ancient texts, accidentally obtains a blank heavenly book called The Shattered Scroll of Mountains and Seas. By hunting strange beasts, he can collect their "true names," illuminate the scroll, and acquire each beast's full abilities. In the process, he also uncovers the truth behind Yu the Great dividing the land into nine provinces and casting nine cauldrons to suppress the Great Wilderness.