Challenge accepted. I think I might try to add to the Gravewalkers by writing about their Homeworld/Recruitment. It'll have to be something short and sweet, I gotta go to a party later tonight.
It's certainly subject to change, given the short period of time this has been initially written, and C&C is always welcome.
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With no known homeworld, it is surmised that the Gravewalkers actually operate from a dispersed fleet. Elements of their forces rarely operate en masse, with few sightings reporting more than a single squadron of vessels, leading Inquisitors such as Master Atronr and Gaelius Marque to give conservative estimates of the size of the renegade force. Of course, such conclusions lead to further theories which may or may not be true - the likes of body-snatching, gene-seed theft and dark pacts are commonly laid at the feet of the Gravewalkers.
++Single pict capture of the hijacked cruiser Orion's Hammer. Currently presumed to be the Gravewalkers flagship++
While the events of the Grythian Harrrowing and the Artanias Incursions appear to lend credence to the theory that the Gravewalkers recruit through snatching children, Inquisitor Atronr has himself pointed to the fact that the perpetrators were never positively identified, even though the Gravewalkers were known to be in the vicinity. Dissected corpses of known members of the Gravewalkers point to standard primaris astartes physiology, implying that the Gravewalkers were not consorters of Chaos. This, in turn - as Inquisitor Marque asserts - would suggest that they use standard Imperial processes to augment and produce recruits to their organisation.
It is perhaps of little surprise to the Gravewalkers themselves that few could believe that their numbers are sustained, at least in part, by the populace of the ships they operate. Piracy and reaving are, of course, a means to an end but don't fully supplant the controlled and exploitable masses below decks. In times of hardship, recruits from the crew families have sustained the Gravewalkers where no other source of manpower can be had.