Agripinaa Sector - History: The Agripinaa Sector is one of the closest Imperial sectors to the former Fortress World of Cadia and the still-contested Cadian Gate, the only predictably stable Warp route that led out of the Eye of Terror and into Imperial space.The Imperial Navy orbital shipyards for the sector are located on the Forge World of Agripinaa. This world provided materials for the Cadian front, and its industrial heartland was solely engaged in the production of ammunition. As such, it was considered a valuable lynchpin in the defence of the Cadian Gate.In 999.M41, war came without warning to the Agripinaa Sector, and the opening moves by the forces of Chaos saw large numbers of plague-ridden space hulks entering Imperial space. Though many were intercepted by the Space Marines and destroyed, some managed to escape the Astartes' attention. Some of these foul vessels of contagion found their way into the Agripinaa Sector, spreading their disease and pestilence amongst the masses throughout the sector.Along with the adjacent Belis Corona Sector, the worlds of the Agripinaa Sector were some of the first to bear witness to the rise of hordes of infectious, undead zombies and Poxwalkers that threatened billions of people on many of the Imperial worlds within the sector. This plague was later named the "Plague of Unbelief" due to the mistaken population notion that it only afflicted those who lacked sufficient faith in the God-Emperor.While the defence of the Cadian Gate from the forces of Chaos continued to go badly upon the surface of many worlds in the Cadian System, in particular Saint Josmane's Hope and Solar Mariatus, the war in space was fought more on the Imperium's terms. The Cadian System had been the focus of Abaddon's primary fleet actions, and the Imperium's fortunes there changed from day to day. The situation was highly fluid and the Chaos naval forces found themselves stretched to exploit the victories they had won.An Imperial fleet the size of which has not been seen since the end of the Gothic War eight standard centuries earlier had been dispatched from Cypra Mundi, and arrived at Belis Corona in preparation for a massive Imperial counter-offensive into the Cadian Gate. The arrival of this vast armada allowed those Imperial vessels that had been fighting continuously since the beginning of the invasion a brief respite. Severely depleted ship's companies were bolstered through indiscriminate press-ganging, and hasty repairs and refits were undertaken on those vessels most in need of them.The Imperial reinforcements were split into battle groups, each tasked with bolstering the defences in a specific sector of the Segmentum Obscurus. The regions around the Eye of Terror encompass many millions of cubic light years, and only by the concentrated application of resources in those areas in most desperate need could the Imperial Navy hope to make inroads and slow, stall, and eventually repel the Chaos warfleets plaguing the region.A small number of Imperial Navy ships won a decisive victory when they managed to hold back a larger Chaos Fleet at the Ilthirium Belt, buying time for Battlefleet Agripinaa to arrive and allow the remaining warships to retreat. This course of action however, left the Agripinaa Sector open to invasion and soon the worlds of this sector and the Belis Corona Sub-sector of the Belis Corona Sector were transformed into nightmarish realms of plague and pestilence.As the full force of Abaddon's invasion hit the sector, one man, Regu Hane, was hailed as a saviour -- he led a bold counter-attack that succeeded in banishing a horde of Khornate Daemons, and would later be raised to the status of Imperial sainthood. Later the mysterious Aeldari Harlequins intervened in the fighting, but the defenders were stymied when the notorious Dark Apostle of the Word Bearers Traitor Legion, Erebus, caused the raging tempest of Warp Storm Baphomael to surge forth and engulf the outlying star systems of the sector.It was only in the closing stages of the conflict that the Imperium was able to mount an effective defence against the raging hordes of the Ruinous Powers, when the combined forces of a number of Space Marine Chapters broke through the storms and fell upon the invaders with a righteous hatred born of 10,000 standard years of conflict.By the end of the war, the planets Albitern, Amistel, Lelithar, Malm's Reach, Ulthor and Yavor lay in ruins, and a number of other key systems of the Agripinaa Sector hung in the balance. Though Agripinaa itself still stands, without the Agri-worlds of Yayor, Ulthor and Dentor its populace may yet starve to death, and without the vital materials provided by the Hive Worlds of Albitern, Amistel and Tabor, its mighty forges may yet fall silent.The so-called "Herald of Nurgle," Typhus of the Death Guard Legion, has claimed the now blasted world of Ulthor as his own realm, a stronghold beyond the Cadian Gate from which he can bring terror to the other worlds of the Imperium at his leisure. Nightmare visions of a thousand astropaths tell of the birth of a new Daemon World within the domains of Humanity.