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Cyclothrathe is a rocky, barely life-sustaining world wracked by violent electromagnetic storms. Once a planet belonging to a long-defeated xenos empire known as the Mitu Conglomerate, it was part of the semi-autonomous Mechanicum Cyclothrathine Holdfast before the Horus Heresy.
Its northern continent was dominated by the Cyclopean Mind a massive crashed Mechanicum war barge. The Forge World's isolation led its ruling Archmagos Draykavac to become increasingly isolationist and secretive, which helped in their decision to side with Horus during the Heresy.