As the war died down and the machine claimed victories after victories over the android, a virus infested 2B, who had been fighting on the side of the machine since her infection, was taken from the battlefield to a lab where the machine could study more about human emotions. There, 2B was stripped of all her combat gears and software and instead had a transmutation device installed into her OS, allowing her to alter her appearances, physics, and even her clothes at the machine's commands. Thus, 2B became a doll for the machine's own entertainment.