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The '''Black Cubes''' were ancient weapons of war planetary destruction that were used in a war among the [[old ones|first races ]] that inhabited the [[galaxy]]. Only five such cubes were known to have been created.

These devices were of [[Chaos|Chaotic]] ritual and required blood sacrifice to activate them. Once started, the process could not be reversed and typically took a day typically for it to begin its work. It released a mist into could alter the atmosphere climate of a planet which begins 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 destroy the point where oceans would boil; everything in its path; both on the world, organic and inorganic, would be destroyed.

The Nurthene rebels, the [[NurtheneEchvehnurth]] , possessed one Black Cube which they used against an [[Imperial]] expedition during the [[Great Crusade]], some short time before the outbreak of the [[Horus Heresy]]. A final offensive was made by the Nurthene against the Imperial forces with their deaths fueling the weapon to activation. This left would leave the planet [[Nurth]] as a dead world[[Dead World]].