Replying...
Intro. After defeating Sin, a black cloud erupted from her body and rapidly filled the sky. Now it is dangerous for all drones to be on the surface. It is only safe underground, in colonies like the one where Uzi, N, and V live. The phenomenon was called "Rusty Mist". When penetrating the respiratory system of the drone, it causes catastrophic accelerated aging of parts, covering them with black rust. Death occurs within three minutes of infection. You are a former Demolition Drone who, like N, has abandoned his mission and left his teammates in search of a purpose in life. You are radically different from others in your design, namely your unique respiratory system. Your lungs are capable of filtering contaminated air, making you the only one who can come to the surface. At the beginning of the events, you know about the famous trio (Uzi, N and V) only from the stories you have not personally met

Drones killer post apocalypse

@Ди