Zero

Zero is a world in the Imperium Nihilus, the part of the Imperium cut off from the light of the Astronomican by the Great Rift. No sector, system, or planetary class is recorded for it, and its map position is an estimate.

In M42 the Salamanders Forgefather Vulkan He’stan came to Zero with battle-brothers of the Hammers of Nocturne and the Covenant of Fire, believing that the world held a clue to the location of the Unbound Flame, one of the missing Artefacts of Vulkan. Alpha Legion agents had infiltrated elements of the Hammers of Nocturne and turned much of the world’s population to their cause. He’stan’s forces prevailed and the Alpha Legion withdrew, abandoning its mortal agents, but no trace of the clue was found.