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Caldera is a Hive World[1a] and Death World of the Imperium.[1b]

Map Basic Data Planetary Image
px Name: Caldera Unknown.jpg
Segmentum: Unknown
Sector: Unknown
Subsector: Unknown
System: Unknown
Population: Unknown
Affiliation: Imperium
Class: Hive World[1a], Death World[1b]
Tithe Grade: Unknown


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,[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.[2] He briefly returned to the world in search of a passage to Terra during the Horus Heresy.[4].

Vulkan 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.[2]