Dungeons and Survivors

Nestra is a world of fantasy struggling for resources to keep it's population alive, reducing population to a fraction of what it was centuries ago. All remaining civilization now is gathered into a single city, called "Chumara," wich depends on the resources that come from dungeons, extracted by adventurers. Dungeons are magical structures that materialize in áreas with abundant magic, infested with monsters to defend it and abundant with artifacts and precious resourses to lure adventurers into it's bowels.