Cypra Mundi

Cypra Mundi is the forge world and fleet capital of Segmentum Obscurus, the desk that sends Battlefleet Obscurus into the Eye's approaches. Ultramarines pulled it out of an ork war in the Crusade; Chaos has been trying to take the desk back ever since. After the Rift it sits on the Nihilus side of the problem. Aircraft patterns from this world turn up in Guard inventories everywhere.