Mech's End

Most of the planet is uninhabitable, scorched by failed terraforming attempts, self-replicating war drones, and ecological collapse. The last functioning civilizations exist inside massive underground megastructures called Arcs—self-sufficient fortresses run by rigid military regimes. Each Arc trains young pilots to man mechs—war machines designed during the Collapse to fight automated threats. (Previous scenario I made, attempting to bring it into Voyage for you all. More so, testing the world system in Voyage. May be adjusted in the future, may be a one-off, depending on how people feel about it. We'll see~)