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From Warhammer 40k - Lexicanum
It was not said it was pre-date the Chaos
{{ChaosPortal}}
The '''Black Cubes''' are ancient weapons of planetary destruction that were used in a war among the first races that inhabited the [[galaxy]]. According to the [[Cabal]], there are at least no more than five black cubes in the galaxy.{{Fn|1a}}
== History ==
{{Spoiler|source=Legion (Novel)}}
These devices were activated by a [[Chaotic]] ritual, requiring blood sacrifice to initialize them. Despite being utilized by the forces of the Ruinous Powers, the origin of the Black Cubes goes back far further, even pre-dating the existence rise of Chaos itselfman, having been created by the oldest races of the Galaxy.{{Fn|1a}}
Once begun, the process named the '''Black Dawn''' could not be reversed and typically took a day for it to begin its work. It could alter the climate of a planet completely, turning the air into noxious vapours utterly inimical to any form of life, stirring winds to levels that scoured the earth from the bedrock and raised the temperature to the point where oceans would boil; everything on the world, organic and inorganic, would be destroyed.{{Fn|1a}}
The [[Nurth|Nurthene]] rebels, the [[Echvehnurth]], possessed one Black Cube which they used against the forces of the [[Imperial]] '''670th''' [[Expedition Fleet]] during the [[Great Crusade]], some short time before the outbreak of the [[Horus Heresy]]{{Fn|1b}}. A final offensive was made by the Nurthene against the Imperial forces with their deaths fueling the weapon to activation{{Fn|1a}}. This would leave the planet Nurth as a [[Dead World]].{{Fn|1a}}
