Orphean war

The Orphean War was a military conflict of epic proportion between the Imperium of Man and the Maynarkh Dynasty of the Necrons that ravaged the Orpheus Sector. This once powerful Sector Imperialis located at the very border of the Segmentum Tempestus had always been troubled by strange phenomena and events, which unfortunately were never recognised by the Imperial authorities as what they really were -- evidence of Necron activity. Following the awakening of at least a part of this ancient species, designated the Maynarkh Dynasty by Imperial scholars, these xenos attacked the Orpheus Sector in full force, leading to the cataclysmic Battle of Amarah which ended inconclusively for both factions but nevertheless sealed the fate of the Orpheus Sector. While still an ongoing conflict despite the disastrous losses on Amarah Prime, the Imperium is currently withdrawing all strategic assets from the Orpheus Sector, hoping to contain and hold the Necrons at bay long enough for a full-fledged Imperial Crusade to be launched to reclaim the sector. In the Era Indomitus, a Torchbearer fleet of the Indomitus Crusade arrived in the sector to provide Primaris Marine reinforcements to the shattered Angels Revenant Chapter, who carried on the fight for the sector from their homeworld of Libethra. To this day, the Orphean War stands as a dark example of what might befall the entire Imperium if the Necron menace is not quickly identified and dealt with.