Atomantic Shielding is an advanced, arcane defensive technology most likely discovered during the Dark Age of Technology that was primarily used to protect Contemptor Pattern Dreadnoughts during the Great Crusade and Horus Heresy. The Contemptor Pattern incorporated not only traditional Dreadnought technologies, but arcane systems drawn from the ancient and guarded lore of the Legio Cybernetica of the Mechanicum. Principal among these is the compact Atomantic arc-reactor core that is more powerful by far than anything of its size in current Imperial manufacture. A series of defensive energy shield generators are mounted in its armoured carapace. The abundance of power it generates can be used to grant the Dreadnought chassis that houses it speed and strength as well as powerful defensive energy field systems to further increase its battlefield durability, providing greater protection from both ranged and melee attacks for the cybernetic walker. However, if the Atomantic arc reactor is breached in combat, it is prone to catastrophic failure, dooming the Contemptor chassis to utter destruction. The miniature nuclear fusion explosion generated by its inevitable destruction is also prone to causing considerable damage to nearby allied units.
- Imperial Armour Aeronautica, pg. 38
- Imperial Armour Apocalypse Second Edition, pg. 25
- Imperial Armour Apocalypse (2013), pg. 20
- Horus Heresy Book One: Betrayal by Alan Bligh, pg. 200