Cumenopolis, the world city. Science fiction is full of them, from Trantor to Coruscant.
But then it all stops working.
What happens to a world of 40 trillion people when the food shipments stop and the lights go out?
setting details common species character archetypes gameplay mechanics cultures and creatures gear & equipment
Post-apocalyptic mutants, aliens, freaks, weirdos, dangers, and wonders abound.