As they hunt down the "Red Girl" entity and the twin leaders , 2B is forced to kill 9S several times to prevent his data from being corrupted, a tragic secret she carries as part of her "Executioner" (2E) programming. The Terrible Truth
Witnessing this from afar, 9S descends into a vengeful madness. He discovers the horrifying truth behind the war: They died out thousands of years ago. NieR.Automata.Game.of.the.YoRHa.Edition-CODEX.p...
The two fight to the death. In one path, A2 destroys the Tower to save 9S. In the other, they both perish as the Machines launch an "ark" containing their memories into space to find a new world. As they hunt down the "Red Girl" entity