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{{otheruses|USE=[[warp storm]]|OTHERUSE=novel|OTHERPAGE=Ruinstorm (Novel)}}
{{GalaxyPortal}}
The '''Ruinstorm''' was a [[warp storm]] that appeared from 007-011.[[M31]]{{Fn|5}} during the [[Horus Heresy]], engineered by [[Lorgar]] to isolate [[loyalist]] forces. It was unleashed by [[Erebus]] during the [[Battle of Calth]]. The Ruinstorm was further grown and perfected by Lorgar due to the misery and bloodshed he unleashed in the [[Shadow Crusade]]. 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}} The storm became so severe that Primarch [[Roboute Guilliman]] feared [[Terra]] lost and created his own auxiliary state, [[Imperium Secundus]], as a safety measure. Only the [[Pharos (Device)|Pharos]] allowed the loyalists to sail through the storm and regroup at [[Macragge]].{{Fn|3}}
*{{Endn|3}}: [[The Unremembered Empire]]{{cite this}}
*{{Endn|4}}: [[Wolfsbane (Novel)]] Chapter 4
*{{Endn|5}}: [https://thehorusheresy.com/explore-the-galaxy Horus Heresy Timeline] (last accessed 13/7/2022)
[[Category:Galactic Phenomena]]
[[Category:The Horus Heresy]]
[[Category:Ultima Segmentum]]
