The spacefaring dwarves are not ruled by a single centralized government, but are instead organized into clans that consider themselves all part of the same extended family (and, if you have time to sit through it all, they can generally produce the genealogical evidence to prove shared blood between any two given clans). Insult or injury to one clan is often interpreted as offense to the whole family, so even though the dwarven clans are not organized under a common government or law, they are bound together by ties of honor, tradition, and blood.
The clans are naturally drawn toward asteroids and other celestial bodies that are composed of mostly minerals and little else. Many of these bodies have been transformed into “citadels” – essentially small mountains that the dwarves are able to mobilize through space as spelljamming “ships.” Their helms are typically in the form of “forges,” which are somehow powered by the “creative energy” produced as a byproduct of dwarven smithing. As a result, as a citadel flies through space, it is mined out from within, producing a large number of worked metal goods. Eventually the citadel reaches a state in which there is nothing left to mine, at which point the dwarves abandon it and seek out a new rock to call home. Abandoned dwarven citadels are known for becoming homes to mind flayers and other monstrous races that prefer dark subterranean environments.
The asteroids and citadels gain air, food, and light by way of a dimly luminescent fungus. They supplement their food needs with other subterranean crops and livestock.
The master of a citadel or asteroid-bound nation is called the “king (or queen) within the mountain," and his or her court is called the “shining council.”