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'''Ferrum Infernus''' is a designation for [[Chaos Dreadnought]]s of the [[Castra Ferrum]] pattern that have not mutated into [[Helbrute]]s.{{Fn|1a}}

Since the knowledge of creating new Dreadnoughts has been lost, the Ferrum Infernus chassis is a relic, hailing from the days of the [[Horus Heresy]]. The warriors interred within the chassis vary strongly in demeanour. Some have become highly experienced veterans, while others have descended into madness.{{Fn|1a}}