Moebian Domain - The Darktide: Unfortunately, the Moebius Domain borders several disputed territories of Wilderness Space called the "Fringe" that contain multiple xenos and Chaos threats. The Adeptus Administratum ensures that for the average citizens of the domain the nature of that threat remains a mystery. It is just called the "Darktide," a shadowy threat that must be kept at bay if the people of the domain are to remain in the God-Emperor's light.It is to protect the domain from the Darktide that the Moebian Regiments of the Astra Militarum are raised, mostly from the teeming populace of Atoma Prime but also from several of the other worlds of the region. The Moebian Regiments have for centuries been fighting an on-going conflict known as the Fringe War against the Darktide.The young people recruited to these regiments have no idea where they are being sent, or what they will face. They are as ignorant of the "Darktide" as any other regular citizen, for they were all once citizens themselves. They quickly learn otherwise.The galaxy is not a friendly or safe place. There are brutal horrors out there --  xenos species, alien predators, and worse -- who want nothing more than to extinguish the fluttering flame of Human civilisation. Out on the Death Worlds of the Fringe, the guardsmen of the Moebian Regiments, called "lasmen," are thrown into the meatgrinder and come face to face with unimaginable danger. In time, their world-view changes. They learn the nature of the Darktide and fight it tooth and nail.Sometimes, they learn too much.Long tours result in trauma, both physical and psychological. Some lasmen are broken by the experience. Some are made bitter and resentful that the gruelling combat they experience is generally unrecognised back home, because the Administratum tends to keep all details of the ongoing conflict quiet so as not to generate public alarm. There might be a few news broadcasts about "great victories," but the rest of the turmoil is screened by propaganda.Some troopers, of course, serve brilliantly and bravely, and remain loyal despite everything they experience. But others fall prey to the insidious touch of the Darktide. They encounter the malevolent effect of the Warp, and it changes them. They become -- literally, in some cases -- the very thing they are fighting against.The Moebian 6th were seduced by the creed of the Darktide and the lies of the Chaos God Nurgle, and they now seek not simply to kill and exact vengeance for what they endured in the battles of the Fringe War, but to share the dark "truth" they have uncovered. They truly believe they have seen the light offered by Chaos, and that the dark ways they have discovered are far better and more liberating for Humanity than the stagnant rubrics of the Imperium. They now seek to share that truth with every living soul on Atoma Prime and they will slay without remorse any who seek to stop them.In the Era Indomitus, the Chaos Cult called the Admonition infested the hive city of Hive Tertium on Atoma Prime. When they unleashed a Zombie Plague and a swarm of Poxwalkers began to assault the lower reaches of Hive Tertium, the Moebian 6th Regiment was redirected from frontline deployment to assist in combating the Nurglish corruption. Instead, the corrupted regiment turned on the people it had sworn to protect and began to support the uprising.To stop this growing corruption, the Inquisition recently deployed its forces and agents into Hive Tertium in a race against time to save the hive city before it can grow into a cancer that could consume the entire world, or even eventually threaten the entire Moebius Domain.