Sublevel

Deep beneath the world of Lytheos, humanity survives in a labyrinth of steel, stone, and eternal dark—and believes nothing exists beyond it. For generations, the Geotheocracy has preached a single, unshakable truth: There is no Surface. There never was. To question it is rebellion. Even to say the word 'sublevel' is heresy.
Narkvosu, once a scholar of forbidden histories, sets out to wander the sublevels as an exile. He has spent years studying relics that contradict doctrine—ancient cities,...