Segmentum Pacificus - Notable Sectors: Chiros Sector - Located on the Segmentum's borders with the Segmentum Tempestus, the Chiros Sector is a turbulent frontier realm which encompasses sub-sectors from both Segmentae. The Chiros Sector saw a marked increase of military activity during the first half of the 41st Millennium. Due both to xenos incursions such as Aeldari-piracy and Ork-invasions, but also Chaos-led rebellions, the Chiros Sector is a realm in constant turmoil that needs increased vigilance if it is to prosper.Sabbat Worlds - The Sabbat Worlds is the name given to a group of star systems that form the Sabbat Worlds Sector along the rimward edge of the Imperium of Man's Segmentum Pacificus. Made up of over 100 known star systems, the region is subdivided into several discrete territories, most notably the Newfound Trailing, the Khan Group, the Cabal Systems, the Carcaradon Cluster, and the Erinyes Group. It is rumoured that the Blood Pact, a highly organised Chaos warrior-cult devoted to the Blood God Khorne, originally came from a star system in this sector. First annexed for Imperial colonization in the 35th Millennium, the name Sabbat refers to the area's original redeemer, Saint Sabbat, a young girl who received a vision from the Emperor to lead a Crusade to bring the region into the Imperium during a Crusade that lasted for 105 standard years and began in 500.M35. Things became rapidly worse for the human population of the Sabbat Worlds during the 41st Millennium, however. A charismatic, brutal Archon rallied the tribes of the Sanguinary Worlds to war, and a series of assaults began from galactic trailward into the region. The assault was thought at first to be a return to the minor Chaos conflicts of the 38th Millennium in the region, but in the years following 600.M41, it became impossible to ignore the true threat presented by Chaos Undivided. The Ruinous Powers had decided to take the whole region away from the Imperium. The Imperium never intended to abandon the Sabbat Worlds, but the power and size of the attacking force was underestimated from the beginning, and the Imperial defenders initially stood little chance. Some held out for as long as a century, but by 740.M41, the Sabbat Worlds were fully in the hands of Chaos, and the area was reclassified "unstable/hazardous" by the Administratum. In the next year, 741.M41, the Civitas Imperialis, the centre of Imperial control in the region, was forced to remove itself from the Sabbat World of Khan Nobilis to a neighbouring sector of the Segmentum Pacificus, and the entire region was officially lost to Chaos. From that time unto the present day, an Imperial Crusade has been ongoing to free the Sabbat Worlds from the hands of the Archon who rules in the name of Chaos, and to reclaim this sector for the Golden Throne. Frightening losses have been suffered by the Imperial forces engaged in the Crusade, and the threat of the Archon's forces has proved to be a true danger to the Imperium of Man, but there is no reason to doubt that the forces of the Sabbat Worlds Crusade will ultimately succeed in restoring the light of the Emperor's peace to this region of the galaxy.Laanah Sector - The Laanach Sector is the Imperial sector that emerged following the conquest in the 38th Millennium of the region of the Segmentum known as the Laanah Rifts.