Light and warmth originate from the ambient rock rather than a distant star above the horizon. A lone world sits within this medium, holding about seventy million people in hollow tunnels.
Dusk reveals a second sky where foreign clouds drift across stars that do not belong to Zlumov. The western cliffs near Vyabrebo mark a hidden opening where air sometimes smells faintly of ozone; herders say it smells like burnt metal when storms pass overhead.

The dimension contains infinite solid rock that fills all space without a single star to illuminate it. A contagion of belief spreads among the poor while the established clergy attempts to halt its growth.
A new faith spreads fast among the poor while the old one fights it with fire and stone walls.
from Song of the Ozone Wind, by Rabrul, chronicler
A specialized beast hunts humans with a preference that cannot be driven away by fear or force alone. Wells dry up in the deep earth and water sold by specific measures determines wealth for everyone.
The gate stands hidden in the western cliffs where local shepherds say the air smells faintly of ozone. Unseen travelers occasionally stumble through a tear in the rock face and vanish without a trace; they are counted among the lost.