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When a nearby cluster of worlds rebelled against the Imperium, Ephisia was used as a staging ground for millions of Imperial Guard to put them down. As the Guardsmen were preparing to board transport barges to take them to their ships, disaster struck when disguised Cultists Psykers launched a coordinated attack. Throughout the gathered Guardsmen, the Pyskers rose to the air and cast a physic storm, that turned into an inferno and engulfed the Guardsmen below them, despite dozens of the Cultists being shot down. When the storm cleared an army ready to reclaim worlds, had been turned into piles of twisted metal and ash. It would later be discovered by the Imperium, that the Alpha Legion member Phocron had been behind the attack, as well as the rebellions on the nearby worlds.