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Klaisus is an ice moon and the furthest planet in the Cadian System. During the Thirteenth Black Crusade the planet became a refuge for Imperial survivors of the destruction of Cadia under the guidance of Saint Celestine. The Black Legion pursued the refugees to Kalisus in pursuit of the artifact of Belisarius Cawl, but were forced to retreat by the Eldar. The Eldar opened up a Webway Portal and guided the Imperial survivors into it.