I've been thinking about the society of the Void Children, or Liedradans.
It's not much changed from the Liedrada's spacefaring days. Although formally the authority of the Lord-Captain of Liedrada applies only within the vessel itself, in practise they control a vast swathe of the territory between the Knives and the Bitter Expanse. Liedradan priesthood is utilized extensively to fortify the authority of the captain's office; official doctrine maintains that the captain is a direct conduit for the will of the Emperor, and therefore, the Gods. Every person of Liedradan descent is considered crew and therefore a part of the vessel, therefore owing spiritual allegiance to the captain. Backed up by a 'nobility' of officers and a strong corps of armsmen - whose loyalty is secured with preferential treatment over common voidsmen - most know better than to dispute the claim.
The High Factotum's office handles all trade flowing through Liedradan territories. Liedrada's chief export is raw promethium from mines in the Knives, from where it is then shipped to the Blood Forges and the Hive, in exchange for technical expertise to maintain the Liedrada's void shields and defense turrets and legions of hiver soon-to-be ratings, respectively.
The commoners are divided into two classes - voidsmen, who are overwhelmingly made up of the descendants of 'native' Liedradans, and the ratings, who are in turn mostly press-ganged tribals or bought hivers. Although in practise, both are considered no better than wage-slaves, the authorities routinely play these groups against each other by stoking racial tensions to reduce the likelihood of an organized uprising.
Despite these ongoing efforts to maintain the Lord-Captain's iron grip, a revolutionary organization calling themselves "The Emperor's True Heirs" has taken root in the underground of Liedradan society. Depicted as a crazed cult in official Liedradan propaganda, the group believes that the Emperor was not, in fact, a champion of the chaos gods, but a man who rose to defy them for the good of his fellow men; eventually conquering death itself in his tireless struggle against the powers that be. Claiming to uphold his legacy and to free the masses from chains of oppression, they intend to drag down the natural order - starting with the Lord-Captain and ending with the gods themselves.