Feuerstadt

The Obsidian Guard's homeworld is the volcanic death world of Feuerstadt, which is situated in the galactic northeast of Segmentum Solar. It is dominated by vast tracts of ash plains with the majority of the population concentrated in the various hive cities that have been built within the dead husks of ancient volcanoes. Little can survive in the wilderness between these cities but that which can is almost as a rule incredibly dangerous and hardy such as the Aschehunde or the Schädeldrachen. The populace of Feuerstadt is likewise resilient in the face of hardship, eking out livings either farming the rich soil immediately outside the cities, laboring in the large industrial conflicts, enlisting in the Imperial Army, or for the exceptionally brave hunting the predators of Feuerstadt.

History
Before the coming of the Primarch Lukas Keath Feurstadt was split into various principalities and city-states that warred against one another for control over various resources, the most important of which were the aquifers. These cities fought bloody and pointless wars for regional supremacy or vital resources like access to the aquifers that supply the people with all of their water. After Lukas grew into adulthood he lead an army that brought all of these separate domains under one banner, his. Instead of thinking of themselves as citizens of a particular city or subjects of a specific noble house now the people were being pushed towards the concept of being of the whole world. This concept of a united, worldwide civilization was difficult to wrap their heads around at first but eventually it became a fact of life. Over the course of the Feuerreich Crusade Feuerstadtian society was mobilized for one objective, to support the war machine of the Obsidian Guard with Aspirants, Imperial Army soldiers, and war material.

After the completion of the crusade Feuerstadt was selected as the capital of the Feuerreich and its prominence on the galactic stage grew until it was one the most important worlds in Segmentum Solar, eclipsed only by the Forge Worlds and the Sol System. Feuerstadt became the factory of armies and warfleets, creating and then dispatching whole Expeditionary forces into the void.

Over the course of the next three decades Lukas reformed the government of Feuerstadt into 50 districts, each encompassing a handful of cities and run by a locally elected official who was assisted by an advisor from the legion itself, the Administratum, and Imperial Army. These ministers oversee all facets of life in their district, from construction to recruitment for the legion and Imperial army.

Sturmhafen
First among these and an exception to the rule is Sturmhafen, Lukas's own seat and the location of the Obsidian Guard's fortress monastery. Though to be honest it is less of a monastery and more a city in and of itself, home to a million souls, a thriving industry, and star port. The centerpiece of the whole complex is the Zitadelle, which was the greatest defensive work in the Imperium apart from the Imperial Palace itself. Two dozen battleship-grade void shields and walls of adamantium-reinforced permacrete dozens of meters thick and hundreds of meters high protect the structure while its defensive armament includes but is not limited to ten orbital defense laser batteries in massive turrets, each of which was capable of tearing apart a capital ship in high orbit, hundreds of missile launchers, artillery pieces, and flamethrowers. It had room for up to a hundred thousand Astartes and several times that number of mortal soldiers, its own foundries, provisions for the maximum occupancy up to fifteen years, and sat atop its own aquifer. A physical manifestation of the Obsidian Guard's function over form philosophy the Zitadelle had no decoration, nor ornamentation, even its plain black paint was scratched in places from the tender mercies of Feuerstadt's weather.

Climate
As a Death World much of Feuerstadt's surface is exceptionally inhospitable, lethal to any without the proper equipment and knowledge. Just outside the volcano hives exist small regions that are the exception to this, as advanced irrigation systems have been built to make use of the fertile volcanic soil to provide food for the populace. In the ash wastes