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{{GalaxyPortal}}The '''Ruinstorm''' was a [[warp storm]] that appeared during the [[Horus Heresy]]. The Ruinstorm was , engineered by [[Lorgar]] to isolate [[loyalist ]] forces. It was unleashed by [[Erebus]] during the the [[Battle of Calth]]. While it was active, the [[Warp]] was unnavigable to loyalist forces. Traitor forces could , however , navigate using secret passages known to Lorgar.{{Fn|1}} Among the loyalist forces isolated by the Ruinstorm were the [[Blood Angels]] [[Legion]], the majority of which was marooned in the [[Signus Cluster]] and cut off from communication with [[Baal]].{{Fn|2}}