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From Warhammer 40k - Lexicanum
→History
However the Sector saw a new upheaval in 819.[[M41]] on the [[Industrial World]] of [[Chemarium II]] when the [[Chaos Lord]] [[Ranker Nonesuch]] spreads destruction and terror. In the ensuing guerrilla war. [[Inquisitorial Stormtrooper]]s are dispatched to aid the suppression campaign.{{Fn|1a}}
In 990.[[M41]], the violent [[Warp]] turbulence that had been plaguing the western Orpheus Sector is suddenly extinguished, causing celestial instability across the region. All across the sector, [[AsropathAstropath]]s and [[Psykers]] are subjected to unexpected deaths and mass hysteria breaks out. The [[Ordo Malleus]] begins to believe that the events are precursor to some major [[Daemonic]] incursion into the region. At the same time, the [[Adeptus Mechanicus]] reports that binary stars of the Sector's Caracol System were unexpectedly destroyed by supernova. However, this report is ignored by Imperial authorities as insignificant.{{Fn|1a}}
===Invasion===
*{{Main|Fall of Orpheus}}
In 3716691.[[M41]], a sudden and utterly unexpected invasion swept across dozens of worlds across the sector. This was the beginning of a massive [[Necron]] invasion by the [[Maynarkh Dynasty]]. After a bitter campaign, 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 that the Sector can not be saved without a large [[Crusade]] that could only be launched within thirty to fifty years minimum.{{Fn|1b}}
==Geography{{Fn|1a}}==
