Scourge Stars
The Scourge Stars is the new mini-empire formed by the Death Guard under the leadership of Mortarion and a few others (But mostly Morty). Made up of 3 diseased star systems, it was created during the waning years of the Indomitus Crusade in the 42nd millennium and its existence is there to simply Troll the fuck out of the Smurfs and annoy the heck out of Rowboat Girlyman since it is located right to the galactic north of Ultramar. Essentially speaking, the Scourge Stars is pretty much that asshole neighbor that constantly fling shit over your fence. Except instead of shit, it the entire Plague Wars. How rude.
Overview
The Scourge Stars were originally three loyal systems of the Imperium, until the outbreak of the Thirteenth Black Crusade and the creation of the Great Rift; which caused the Warp to run unchecked, within an area of space now known as the Dark Imperium. When the Chaos God Nurgle discoverd the Dark Imperium's creation, he decided to enact his long held plan of annexing the prosperous worlds of the Realm of Ultramar, into his Garden and began what became known to the Imperium, as the Plague Wars. These series of fierce battles, between the forces of Nurgle and the Imperium, first occurred within Ultramar, but soon spread to the areas surrounding it. The three systems that became the Scourge Stars, were one such area and after they fell to the forces of Nurgle, they became an empire from where the Plague Father could continue to launch attacks against the nearby Realm of Ultramar. The plague forces located within the Scourge Stars are commanded by three of Nurgle's greatest commanders, who are charged with the single goal of adding the worlds of Ultramar to the Chaos God's Garden.