Bylithran 418

418, known locally as the Dark Labyrinth, designated Forbidden world. A former mining colony, it was prohibited by the Inquisition after a war with the Dark Mechanicus. It is the homeworld of the Sons of Gorgon astartes chapter. The planet’s atmosphere is toxic and most inhabitants live under the surface. The underground is characterized by endless labyrinths and disparaged, once-great cities. Warlords fight for power and survival, committed to wars with monsters, abominations, evils, and eachother. The Sons of Gorgon are distant keepers that sometimes grant boons to those they favor. For example, citizens who deliver technology to their keep may be offered safety, enough food to last generations, or the destruction of a rival tribe. The Sons of Gorgon scatter warlords who become too powerful and threaten the instability of the labyrinths.

Imperial Settlement (M31)
The Dark Labyrinth was founded as a mining colony, under a name lost to history, for its vast reservoir of metals. In time it’s population and infrastructure grew to become the foremost source of as arsenic, cadmium, copper, iron, lead, mercury, and zinc in the sector and beyond. Its population moved underground as pollution engulfed the atmosphere and heavy metal poisoning became rampant. Underground they formed great cities, designed and implement by the Adeptus Mechanicus. The techpriests easily became the most prominent force in politics, controlling the heavy machinery and cities.

Crisis and Collapse (M36)
The world’s richest reserves were mined out as time passed. Employment began to drop. Food imports became scarcer and scarcer. The great cities which relied on exports became impoverished. The citizens suffocated in the grip of the dark underground which had became their prison and their tomb. The cities threatened war with one another as several generations had passed.

When the mutual destruction of one another threatened the planet, hope came in the form of Saint XXX. The Adeptus Minostorum orbited the planet in its quest to populate the first Shrine World of the sector. The great saint asked the citizens to join him to the new world. To find meaning in service. To find a new use for their lives and the lives of their children. Most citizens left the hopeless wasteland on the grand fleets. The Dark Labyrinth was left with what little remained who devolved into warring savages.

Homeworld (M40)
The planet was scouted by the newly arrived chapter of the Sons of Gorgon. The Sons of Gorgon made their homeworld on the Dark Labyrinth after witnessing the tech-barbarians. The Chapter Master remarked on their affinity to both technology and brutality.

Dark Mechanicus War (M40)
Some time after, proof of renegade tech-priests in the sub-sector came to light to an inquisitor. When proof was found a great war was called to purge the heresy. Most prominent of participants were the Sons of Gorgon and the Adeptus Mechanicus. They fought together across the sub-sector. Members of both factions spoke on philosophies of the Omnissiah and technology which led to a harmony between the two. When the hereteks were defeated the Dark Labyrinth was declared a Forbidden World for taint of tech-heresy and the warp. The Sons of Gorgon never left their homeworld and has been a point of contention between them and the Adeptus Mechanicus since.

Regions
Scoured Overworld

Necropolis Region