Audacia Sector: Demophon

Encircled by three warp storms at the same time which formed in a matter of days in 646.M41, travel to and from Demophon is at some times highly dangerous and at others literally impossible. In addition, the planet is not at its recorded place, but rather appears in different systems at seemingly random times, not unlike a Space Hulk. This is the reason Demophon is not recorded on the sector map.

The status of this world is uncertain. While rumors exist that the former Imperial World has turned into a Daemon World, all accounts of this are highly suspect. The Adeptus Mechanicus of Hephaes has been chasing after Demophon for years, but has thus far been unsuccessful in examining the mysterious world, as it's impossible to get reasonably close by warp travel thanks to the three warp storms around Demophon.

The few reliable sightings over the centuries tell of no obvious signs of change to the world; from afar Demophon looks like an ordinary world.

As of 996.M41, Demophon seems to have returned to the Audacia Sector for good – but it's not the same planet that vanished in 646.M41 … it's a much older version of the planet! For some reason and in some non-explicable way the planet has returned to the early days of the 31th Millenium, more precisely: back to the latter days of the Horus Heresy. A large contingent of the Death Guard was tasked with storming the original recruitment planet of the Imperial Fists in this sector, to cut off any potential reinforcements for the besieged forces on Terra. The Imperial Fist's fortress on Demophon was only minimally staffed, as most forces have been ordered back to Terra to defend humanity's home world already, and the Death Guard was about to wipe the Imperial Fists from this planet. A sudden Exterminatus-like event seemingly eradicated all life from the world in an instant, and the world was left unpopulated for millenia. The state of the world seems to have returned just prior to this event, leaving both Imperial Fists and Death Guards to continue their fight. 

As of yet it's uncertain what this sizable force of Death Guards, ripped from the 31th Millenium, will do in the 41th Millenium ...