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From Warhammer 40k - Lexicanum
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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|1a1b}}
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