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One-Five-Four Four aka Caldera was originally brought into compliance by [[Vulkan]], [[Ferrus Manus]], and [[Mortarion]] during the [[Great Crusade]]. After fighting against the Eldar, who {{Fn|3}} they unleashed a great purging flame across the world. Disgusted by his own actions against the rebellious [[Human]] population, Vulkan pledged that never again would Caldera face such destruction. {{Fn|2}} He briefly returned to the world in search of a passage to Terra during the Horus Heresy.{{Fn|4}}.  He reappeared from his self-imposed exile 1,500 years later to uphold his vow during the [[War of the Beast]], fighting on his own against a massive [[Ork]] invasion. Thanks to the efforts of Imperial forces led by [[Koorland]], Caldera was saved from being converted into an [[Attack Moon]].{{Fn|2}}