Location from Cradle by Will Wight
An ancient underground network spanning the entire world — built by a forgotten civilization to contain their greatest mistake, now holding Subject One and the source of all hunger madra.
The Labyrinth is the oldest structure on Cradle — built by a civilization powerful enough to create the Dreadgods and stupid enough to try. Its upper levels have been explored by generations of sacred artists looking for ancient techniques and artifacts. Its lower levels kill everyone who enters them through sheer hunger-aura concentration. The Labyrinth has multiple entrances across Cradle — beneath Sacred Valley, within the Desolate Wilds, and at other locations that most people have forgotten. Each entrance is guarded or suppressed, though the protections are failing as Subject One's influence grows. The structure itself may be partially alive — walls rearrange, paths change, and the scripts on the walls sometimes seem to respond to the presence of hunger madra users.
An impossibly vast network of underground chambers, corridors, and vaults built from materials that predate current civilization. The walls are inscribed with scripts in dead languages, and the deeper levels are saturated with hunger aura so dense it manifests as visible violet-black mist. The architecture becomes increasingly alien the deeper you go — the upper levels are recognizable as constructed spaces; the lowest levels defy geometry. Subject One's prison sits at the deepest point, pulsing with hunger that can be felt through hundreds of feet of stone.
Also known as: the Labyrinth, the underground, Subject One's prison