Acheron

Overview:
A series of huge caverns carved out beneath Downtown, now home to their own small but vibrant community. Hidden away and difficult to access, this small city is not recognized by Lellorium's government as part of the country, and is thus entirely unregulated by laws and police forces. This makes it an excellent gathering place for villains, though an unofficial force of vigilantes will quickly strike back against any who go too far and break its fragile peace.