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The '''Orpheus Sector''' is was an [[Imperial]] [[Sector]] of [[Segmentum Tempestus]]. Its last Sector Governor was [[Calibron Laan]]. After a devastating [[Necron]] invasion, the [[High Lords of Terra]] declared its dissolution in 999.M41{{Fn|1b}}.

In 570.[[M30]] in the latter part of the [[Great Crusade]], legend has it that the [[Rogue Tradertrader]] Lady [[Arica Orpheus]] conducted ranging expeditions into explored and catalogued the vast expanse known as reaches of the galactic southwest in mid-[[Mandragoran StarsM30]] on the outermost borders of what will become Segmentum Tempestus. Known as a dangerous uncharted region which mostly can not sustain lifeThe area contains many aged stars, records of the regions [[dead world]]s, and celestial hazards that limited her exploration. Records in the great libraries of [[Terra]] make reference to sinister pre-[[human]] ruins and monuments on [[Dead World]]s. This reputation combined with the difficulty in navigating near the [[Veiled Region]] made Lady Arica Orpheus' expedition hazardousthose dead worlds.{{Fn|1a}}

During the [[Horus Heresy]], the savage civil war saw the regions of the sector under control torn apart by lawlessness and anarchy. Neither the forces of the [[Emperor]] or [[Horus]] controlled the region. During the bloodshed of the [[Scouring]], the [[Alpha Legion]] warlord [[Dynat Mal]] fled to the Sector's Mandragoran Stars. Dynat's forces, known as the [[Shadowed Ones]], employed guerrilla tactics and dark forces to take over much of the region. This sundered realm eventually became known as the '''Dark Marches'''{{Fn|1a}}.

In 610.The Orpheus Sector was not formally established under after the [[M36Age of Apostasy]], the Imperium when Segmentum authorities launched a series of crusades. The most successful was the [[Dark Marches Crusade]] with under Lord Tempestus [[Hal Orpheus]], which brought over six hundred worlds under the intent rule of reclaiming the region in the name of the EmperorImperium. After a century and a half The arcing band of fightingspace was subdivided into four sectors: Haxan, Leyak, Eurydice, the Crusade ends with Imperial victory and the Orpheus Sector is officially founded by its first [[Governor]], [[. The aging Hal Orpheus]]. By 113.[[M38]] however , kept alive only through the arts of the Sector becomes plagued by uprisings and [[CultistAdeptus Mechanicus]] activity as the Sector's military resources are drained int he face of campaigns mandated by Segmentum Command. To make matters worse , became the first sector [[Chaos Lordgovernor]] , ruling from [[Von MallasAmarah Prime]] launches his . Favoured [[Black Crusade of Von Mallas|Black CrusadeImperial Guard]]regiments received Arcantis, Gedrid, and fighting reaches Midwinter, while the Orpheus Sector. Much of the sector's commerce and resources are destroyed over the course of the war.Adeptus Mechanicus received Myre in perpetuity{{Fn|1a}}.

Another tragedy hit the sector in 715In 976.[[M38M37]] , all contact was lost with Leyak Sector. In response, the Orpheus Sector authorities increased their military tithes, constructed orbital defences, and forbade colonial expeditions into the rising Veiled Stars on pain of death. These restrictions increased civil tensions in the sector. Authorities brutally suppressed riots, rebellions, and [[Cult Celestariicult]], which is never stamped out despite activities across the best efforts of sector. When the [[Adeptus Arbites]] and [[Ordo HereticusBlack Crusade of Von Mallas]]. In 899the Transgressor reached the sector in 113.[[M38]], a mysterious event occurs as the world of it caused further uprisings on [[TlalocSaint Marduk's Bane|Colkasth]] is destroyed by an unknown foe over the course of a matter of hours, though the and [[Ordo XenosEpirus]] maintains , draining resources required to fight the Transgressor's forces. [[Dark EldarMorros]] Lachrymal was founded as a penitentiary world to be hold the culprits. Faced with countless wars, economic mismanagement, and tragediesrebels, but the Orpheus Sector erupts into a [[Orpheus Revolt|Full Scale Revolt]]. Following years of bloody fightinghad ruined Epirus, the Sector finally enjoys which would take decades to recover even a period shade of renewed stability and relative prosperity.its former productivity{{Fn|1a}}.

However the Sector saw a new upheaval in 819.The [[M41Celestarii]] on cult came to prominence during the civil unrest. [[Industrial WorldAdeptus Arbites]] of and [[Chemarium IIOrdo Hereticus]] when forces suppressed it wherever they could but they could not completely stamp it out. The Celestarii rejected the [[Chaos Lord]] [[Ranker NonesuchImperial Creed]] spreads destruction and terrorvenerated a superior race that would bring eternal life to their loyal servants when they awakened. In The cult took xeno-archeological remains from across the ensuing guerrilla war. [[Inquisitorial Stormtrooper]]s are dispatched to aid the suppression campaign.sector as their sacred relics and secretly carried out cannibalistic rituals{{Fn|1a}}.

A sudden and mysterious attack struck the [[agri-world]] of [[Tlaloc]] in 889.[[M38]]. A squadron from Battlefleet Orpheus found the world annihilated with no intact bodies or recording devices to tell them what enemy had destroyed the world so swiftly. The Lord Commander declared the world under permanent quarantine while [[Inquisitor]] Kussan of the [[Ordo Xenos]] believed the [[Dark Eldar]] were responsible for the attack{{Fn|1a}}. After nearly a thousand years of strife and warfare, its worlds bleeding resources to fight wars elsewhere and reinforce the sector capital's defences, and infighting amongst sector nobility, the Orpheus Sector erupted in [[Orpheus Revolt|civil war]]. Rebels in the Drucillan Cluster overthrew the government and declared their secession from the sector, rallying other rebels to their cause and undermining the sector's stability. The parliament of Amraphel hired xenos mercenaries to fight their enemies, only to become the victims of the [[Khrave]] they had hired. Imperial authorities learned that the [[Chaos|Great Enemy]] had orchestrated most of the unrest{{Fn|1a}}. In 903.M39, hope came to the fractured sector in the form of a crusade fleet. At the head of the fleet stood [[Arch-Confessor]] [[Marduk]] of Helvamon. Marduk declared a [[War of Faith]] for the souls of the Orpheus Sector, claiming to have received a warning from the God-Emperor himself of a great and terrible threat to mankind rising from the darkness of the sector. The Arch-Confessor provided a figurehead and a rallying point for the resistance against the dark powers. By 921, the Imperial forces had effectively destroyed the enemy, with only one holdout on Colkasth. The [[Angels Revenant]] strike cruiser ''Intercessor'' investigated the sudden cessation of Astropathic communication with the ground forces: two extremely powerful xenos void craft ambushed it on the edge of the system, but ''Intercessor'' destroyed one and drove off the other. The damaged ship can only watch a raging battle in-system via long-range auguries and by the time ''Intercessor'' reaches orbit, the attacking force has fled, leaving Colkasth a burning, irradiated wasteland. The Angels Revenant sorted out the few survivors and the planet was renamed Saint Marduk's Bane{{Fn|1a}}. In 819.[[M41]], a contagious madness spread across the [[Industrial World]] of [[Chemarium II]]. The [[Chaos Lord]] and self-styled "Beggar King" [[Ranker Nonesuch]] led his insane followers to destroy Imperial manufactoria and slaughter Imperial forces. Nonesuch then spread his uprising to the rest of the system. [[Inquisitorial Stormtrooper]]s were dispatched to aid the suppression campaign while an exclusion zone was established around the system.{{Fn|1a}} In 990.[[M41]], a sudden shockwave through the violent [[Warp]] extinguished the turbulence that had been plaguing plagued the western Orpheus Sector is suddenly extinguishedfor three centuries, causing celestial instability across the region. All across the sector, [[Astropath]]s and , [[Psykerspsykers]] are subjected to unexpected deaths , and mass hysteria breaks out. The [[Ordo Malleuswitch]] begins to believe that es across the events are precursor to some major [[Daemonic]] incursion into sector went mad or simply dropped dead. Many void ships were blown off course or destroyed. Panic and mass hysteria gripped the regionDrucillan Sub-sector. At the same time, the [[Adeptus Mechanicus]] reports reported that the binary stars of the Sector's Caracol System were system unexpectedly destroyed by went supernova. However, this report is ignored by The [[Ordo Malleus]] believed that the events were precursors to a major [[daemonic]] incursion into the region. Imperial authorities as ignored the Caracol supernovae, deeming the matter insignificant.{{Fn|1a}}

*{{Main|Fall of OrpheusOrphean War}}In 37166913716991.[[M41]], a sudden and utterly unexpected invasion swept across dozens of worlds across the sector. This was the beginning of a massive invasion by the [[Necron]] invasion by the [[Maynarkh Dynasty]]. After a bitter campaignIn 995.M41, the Orphean War reached an untenable stalemate that saw Imperial forces besieged and cut off but nonetheless holding portions of the sector. Necron forces became bogged down against the unexpected arrival of [[Chaos]] warbands, and the Imperium estimates Imperial authorities estimated that the Sector can not be saved without would need a large [[Crusadecrusade]] that to save it, which could only be launched within thirty to fifty years minimum.{{Fn|1b1c}}

==Geography==The Carta Imperialis File Register of 2231990.M41 lists the following principal celestial domains of the Orpheus Sector{{Fn|1a}}:===Major Systems===*[[Amarah]] - Sector Throne-hold, [[Hive World]], Fortress Imperialis, and principal fleet anchorage of Battlefleet Orpheus.*[[AutraphelAmraphel]] - [[Imperial]] world*[[ApollgonApollyon]] - [[Ecclesiarchy]] world*[[Arcantis]]: Imperial World

*[[ChemarimChemarium]] - [[Industrial World]] (Ongoing Civil Warcivil war)

*[[HydraghastHydroghast]] - [[Agri-World]]

*[[ElbethraLibethra]] - [[Angels Revenant]] [[Adeptus Astartes]] [[Fortress-Monastery]]*[[EysmarrbusLysmarchus]] - [[Fortress World]]

*[[VataraPatara]] - [[Feral World]]*[[KibasuRibasu]] - [[Hive World]]

*[[TamyrisThamyris]] - Abandoned World*[[TlalorTlaloc]] - [[Quarantined World]]/[[Death World]] ===Prohibited Worlds===*Altun: [[Dead World]]*Caracol: Dead World*Cutlar: Dead World*Nightshard: anomalous celestial mass*Uxmal: Dead World 57 minor systems not notable. ===Sub-sectors===*Capitoline Sub-sector*Deluvian Sub-sector*Drucillan Sub-sector*Eleven secondary administrative regions*Seven exempted divisions

**{{Endn|1b}}: pg. 59**{{Endn|1c}}: pg.60