Created in limited numbers in the latter days of the Great Crusade of the late 30th Millennium, the Leviathan Pattern Siege Dreadnought or more simply, the Leviathan Dreadnought, was developed in secret on Terra, away from the pervasive oculars of the Mechanicum. Its massive frame incorporates hybridised technologies, some dating back into the dim past of humanity. Towering over later Imperial combat walker patterns, this heavily armoured Dreadnought is savagely powerful. It was designed for siege warfare and primarily armed with close combat and support weaponry that can rend buildings, vehicles and flesh alike; though it is no less effective when armed with the powerful and esoteric short-ranged weaponry uniquely developed for it. The Leviathan's oversized Atomantic Reactor allows it to bear weapons more powerful than other classes of Dreadnought, and also powers reinforced energy fields that surpass those developed for the Contemptor Pattern Dreadnought. Power has its cost though, and the systems of the Leviathan place a lethal level of strain on the minds of its occupants. Space Marines who find themselves interred within a Leviathan will pay a heavy toll; either with their life, or their reason.
Those few examples of Relic Leviathan Dreadnoughts which survive into the late 41st Millennium are ancient and terrible relics, rarely spoken of and rarely deployed, dreaded as much as they are revered by those Chapters in whose armoury vaults they reside and stand empty until direst need. The tormented and ravaged minds of those Astartes interred within are driven to the edge of madness by the little-understood mechanisms unique to the Leviathan, trapped in gore-soaked dreams of the lost Age of Darkness during the Horus Heresy which haunt the machines themselves, and soon suffer a final dissolution owing to the terrible strain the Leviathan inflicts on those who would dare to master it. Only the full authority of a Master of the Chapter is sufficient to unleash these terrifying machines in war, as where they strike and what they kill is as often determined by their dark dreaming as it is the will of their commanders.
Developed in the highest secrecy not on Mars, but on Terra, the Leviathan was an alternative development of the highly successful Contemptor Dreadnought. It represents hybrid technologies, some of which it is believed date back to the Age of Strife, which rumours had it were created by the hand of the Emperor directly. The resources required to produce one were immense, equal perhaps even to an Imperial Knight. Made available to the Legiones Astartes only in limited quantities before the outbreak of the Horus Heresy, they were highly valued and recognised as savagely powerful siege and hunter-killer units. They placed an onerous and ultimately lethal strain upon their occupants, the Leviathan's incumbent burning brightly but briefly in their second life. Many in the Mechanicum were deeply uneasy over the design, seeing it as purpose-designed to match and indeed destroy the Mechanicum's own Battle-Automata in some future, unforeseen crisis or dispute between them and the wider Imperium.
During the Horus Heresy, Loyalists with access to Terra were able to obtain new Leviathan Dreadnoughts, although never many, while Traitors and isolated forces were reduced to marshalling their few Leviathans carefully or hunting down the relics of the dead from the battlefields to be re-commissioned.
The Deredeo Pattern Dreadnought is a dedicated heavy support walker, and though it shares many core components and systems with the more general assault-based Contemptor Pattern Dreadnought, the Deredeo was designed purely for ranged support. The Deredeo Pattern Dreadnought, with its formidable carrying capacity and battlefield stability, was used as a test-bed platform for a number of advanced Legiones Astartes weapons systems, created from the wisdom won during the two centuries of the Great Crusade. The standard loadout for the Deredeo consisted of a set of twin-linked Anvilus Pattern Autocannons, known as an Anvilus Autocannon Battery, and a set of carapace-mounted twin-linked Heavy Bolters. The Heavy Bolters could be replaced with a set of twin-linked Heavy Flamers and an Aiolos Missile Launcher could be mounted atop its carapace. With its formidable carrying capacity and battlefield stability, the Deredeo was used as a test-bed for a number of advanced weapon systems. Chief amongst its anti-vehicle armaments was the Arachnus Heavy Lascannon Battery. The Deredeo could also be outfitted with smoke launchers, a searchlight, and extra armour plating or armoured ceramite plating.
The Deredeo Pattern shares the Contemptor Pattern's system of defensive energy field generators inside its armour plating and is powered by the enhanced Atomantic Power Core within. The Helical Targetting Array's advanced Augury and sophisticated banks of Combat-cogitators allow the Deredeo to track and destroy even the swiftest of targets with ease. However, due to the Helical Array's delicacy and ravenous consumption of power, the Deredeo must be immobile while the system is in operation. The Deredeo also sports the Atomantic Pavaise, a highly experimental system developed by the Clave Nuathac sub-cult Magi of the Forge World of Anvilus. The Atomantic Pavaise was created with Zone Mortalis operations in mind, and the idea of turning the Deredeo Pattern Dreadnought into a mobile bulwark against the heaviest enemy weapons fire.
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