Beast Control: My Black Eggs Can Swallow Evolution

Traveling to the end of the beast-controlling world, former killer Lin Mo gave up the SSS-level beast during the awakening ceremony and chose a D-level black egg that everyone laughed at. Everyone laughed at him as he was crazy, even the girl he had a crush on turned away. Until they saw—— The black egg swallows everything and evolves, the Wild Boar King's body is gone, and powerful enemies evaporate in an instant. While others were still struggling for the C-level evolutionary map, Lin Mo's black egg had quietly broken through to the SSS level. Only then did he discover that the origin of this egg had the same origin as the catastrophe that changed the rules of the world three hundred years ago... How will a lonely killer with a humorous mask subvert this monopolized world with his "useless" contract beast, inside and outside this wall that is both a shelter and a cage?