Historica of The Seelen Stream Sub-sector

First known colonization ships reach the Seelen Stream. Evidence points to Corith being the first system.

First recorded instance of the monolithic black structure known in the era as "The Black Scepter" is discovered at the astrological center of the Seelen Stream. Found to be inert in initial records save for communication distortion and difficulty in warp translation for roughly one parsec around the monolith. Later dubbed " The Emperor's Scepter" during the Great Crusade.

The xenos species known as the Conotrix Hegemony launch a coordinated invasion and occupation of the Corith and Handi systems and controlling real space all the way to the Delagara Dwarf Cluster. These systems would be subject to brutal occupation and colonization efforts of the Conotrix for the next 3000 years, some worlds seeing the complete eradication of human life.

The return of visual contact and limited communication with the worlds of the Ornis system is accompanied by the appearance of a new astral body known only as "The Blood Star". A solitary red dwarf star that seems to radiate maleficence to all who gaze upon it. Rumors swirl throughout the sub-sector on its true nature to the present day.

The sub-sector sees crusade forces arrive from the Thetus Mandeville Point. A combined force of the 5th Legion White Scars and 14th Legion Death Guard legions along with the 891st Expeditionary Fleet of the Exertis Imperialis.

The crusade forces lead a lightning six year campaign throughout the inward side of the subsector, liberating both the Corith and Handi systems. Driving the xenos past the Gimhaesyeo Nebula, Imperial recolonization and reeducation efforts soon followed.

After affecting the Ornis compliance, the remaining forces reorganize in the Gloriana Nebula. Officially done to root out local abhuman pirates, the now traitorous forces begin entireties with the mutated residents and gather strength for their betrayal. Whatever occured in Ornis, the forces of that campaign now sat squarely against the Imperium.

With the initiation of the Sundering of Hephaestus, elements of the original Ornis compliance poor forth out of the Gloriana Nebula and strike at the remainder of the expedition, bolstered by local forces in the sub-sector disillusioned with Imperial rule. The loyalist forces are dealt a severe blow with the opening volley given in the Handi system as traitor forces translate and immediately open fire on the drydocked fleet elements recovering after the Conotrix Liberation.

Waaargh Zapp Smasha translates into the Seelen Stream from the Gimhaesyeo Gulf and rampages across the sub-sector, immediately attacking the Handi, Corith, and Valloix Systems. It is only after 90 years of brutal fighting and the intervention of the Nemesis, Death Eagles, and Crimson Fists chapters that the Waaargh was eventually halted before leaking into the already beset Spartus and  Forsarr sectors.

The Reign of Blood reaches the Seelen Stream as the Crusader Hosts of Valloix spill out and begin internecine campaigns against other in sub-sector systems with support of the more fanatical elements of the Seelen Battle Fleet. Ornis and the Hephaestus systems receive the brunt of the outpouring of violence and it is only after petitioning the aid of the other systems and Legio Verus that fanatics are purged from the sub-sector. House Bertrand is officially censured by the High Court of Iconia and forced to pay restitution to the Synod of Hephaestus and Ornis planetary governors for the next 500 years.

Due to the ever increasing strain caused by both external and internal forces on the Seelen Stream, the Steel Tigers astartes chapter arrives in system and is granted rights to the feudal world of Tanju as part of the 12th Founding. It is then charged by the Adeptus Terra to secure the sub-sector for all time to ensure its flow of peoples and material is never interrupted.

The Starbone Spacehulk tears back into reality within the atmosphere of the Montark rogue gas giant. The resulting combination of a moon sized object in atmosphere, warp rift, and gravitational distortion leads to the complete destabilization of the planet and cataclysmic destruction of the astral body and five of its seven moons.