Gray fog has locked the world for three years, and monsters are gnawing at the last living space of mankind. Outside the shelter is purgatory, and inside the shelter is a strictly hierarchical cage. Lin Ye is the "residue" at the bottom of shelter 127. He collects monster remains in exchange for compressed biscuits. The bone-eating moth scar on his arm is the only mark of his survival.
Until the Rust Beast broke through the defense line and was about to die, the bead in his body that he swallowed by mistake three years ago finally awakened: it was the core of the ancient Chaos Beast! Since then, he has been able to form scale claws to resist corrosion, and can swallow monster cores to increase his strength. From a boy that everyone trampled on, he has become the "Monster No. 0" That is feared and valued in the hunting tower.
The light of the Chaos Core has led to more deadly crises: the Flame Hell Beast that spews flames in the volcano, the Ice Soul Beast that freezes life under the glacier, and the Wind Snake Beast that tears everything apart in the storm. They guard the three ancient cores; there is also the "Dark Beast" organization watching with eager eyes. Mo Ying's ice sword is dyed with the blood of the beast hunters, and its target is directed at all cores, even the "Dark Core" hidden in the darkness.
Lin Ye teamed up with the silver-level hunter Su Qing, the heavy-axe war god Zhao Hu and others to fight on the edge of life and death from volcanoes to glaciers. The stronger the power of the transformable beast, the more turbulent the chaos beast's consciousness becomes - will it become a monster that destroys the world, or will it grasp its power and tear open the gray mist to protect the refuge? This core battle has already staked the survival of mankind!
