Lore
After the Second Collapse, the last habitable city was built around six reactor rings. Each ring that fails takes a district with it.

World
The lights are going out, ring by ring.
After the Second Collapse, the last habitable city was built around six reactor rings. Each ring that fails takes a district with it.
Power is currency. Nobody leaves the walls. Engineers outrank soldiers.
Pick an opening. Then choose who you walk in with.
The eastern ring is minutes from failure and the only person who can stop it needs a second pair of hands.