A snake-shaped monster and the main antagonist of this arc. Its offspring can possess human bodies. It hid within the human world for a long time, gradually developing a human-like personality through Li Yifei. It planned to have Li Yifei join the Night Watch to gain access to insider information and escape being hunted. When its plan was exposed by An Qingyu and Lin Qiye, it attempted to kill An Qingyu as a last resort before being decapitated by Lin Qiye.
