The Cicatrix Maledictum & the Ilyxis sector

Abaddon the Despoiler achieved goals he had pursued since the Horus Heresy. Reality split as fault-lines closed millions of years ago were rent wide. Isolated warp storms and anomalies spread their arms, reaching for the burning might of the warp. The Eye of Terror vomited its diabolical energies across the firmament. The raging storm it unleashed devoured tens of thousands of star systems. Millions of worlds were consumed. Races that had never known the wrath of man or the taint of Chaos were expunged in an instant. Imperial worlds fell by the score. Many thousands not destroyed outright were plagued by hordes of daemons, their psykers’ minds ripped open to allow the fell beings of the empyrean to walk among mortal populations. A warp storm of a size not seen since the Emperor took to the Golden Throne raged across the breadth of the galaxy. A billowing wave of madness engulfed space, travelling far faster than time and distance should have allowed. In the empyrean the Astronomican flickered and died. Rains of blood fell on terrified people on worlds thousands of light years from the Cadian Gate.
All creation rocked. In the no-spaces between realities, the rift was felt. In places far distant to the reality of man, strange beings dreamed of fire and blood.
Illyxis was a relatively young sector in galactic terms, with many worlds still left unexplored and unexploited. As such the fall of Cadia hit the already unorganised worlds of Ilixys harder than more established sectors. In the chaos that followed the Noctis Aeterna, sector command lost control over most of the subsectors and as many people and materials as possible were evacuated towards the Twin Bastion subsector to maximize chances of survival. Many ships were lost forever to raging warp storms, and the few that survived the harrowing retreat had no intention to risk a second trip. Countless billions were left to their own devices. Untold worlds looked desperately up to the skies for salvation in the form of a bold ship captain, but found only the crimson grin of the great rift staring them down. Little intel is known about the worlds beyond Twin Bastion, but any captain bold or foolish enough to set sail towards them should expect only death, chaos, and those monsters who thrive on these.