The Moirae Schism was a major event in Adeptus Mechanicus history that took place during the Nova Terra Interregnum in M35. The civil war tore the Adeptus Mechanicus apart, dividing the Cult in ways unseen since the Schism of Mars during the Horus Heresy. The Moirae Tech-creed was based on the prophetic wave of calculations of a triad of tech-mystics enshrined within the rebellious Forge World of Moirae. The creed maintained that the beacon of the Astronomican contained hidden messages within its micro-fluctuations, and that these messages were from the Omnissiah and prophetic in nature. The Moirae Techpriests compiled these apocalyptic messages in their archives, copies of which quickly spread through many of the Cult Mechanicus' sub-sects. These radical teachings included references to the future overthrow of Mars and the fusion of the Adeptus Mechanicus and Ecclesiarchy. Such claims were treated as heresy by Mechanicus authorities on Mars, and civil war was quickly sparked between traditionalist and radical elements.
Eventually, Moirae was destroyed by a Adeptus Mechanicus Fleet sent from Mars itself, but not before the schism spread throughout the Mechanicus. Several Titan Legions and Space Marine Chapters with close ties to the Mechanicum defected to the insurgents. Over two thousand years of bloody strife passed before the rebels were finally purged by the Imperium.
It is also known that during this Schism Techno-Priests of Moirae utilised a hidden machine code during their construction to cause Whirlwind Hyperios' produced on this Forge World to power down upon receiving certain command-cipher. Since that many Space Marine Chapters distrust the Whirlwind Hyperios' altogether.
- 1: Warhammer 40,000 6th Edition Rulebook pg.170
- 2: Imperial Armour Volume Ten pg.96
- 3: Imperial Armour Volume Two (Second Edition), pg. 88