The true reason, however, that the Castraferrum remains in common use while the Contemptor and other patterns are rarely seen lies with the technology utilised within its many systems.Instead of the ill-understood Atomantic Arc Reactors and Helical Targeting Arrays of the Contemptor Pattern, the Castraferrum uses an adaptable thermic reactor and other such technological systems already found within a wide range of current Adeptus Astartes war machines.
Dreadnoughts are war incarnate, towering machines that advance forwards with thunderous strides, fiery death roaring from the myriad of heavy weapons mounted on their hulls.
Dreadnoughts are a combination of armoured walker and cybernetic life-support system; their pilots are neurally linked straight into the Dreadnought's cybernetic systems, and are able to use the walker as if it were their own body, although they are permanently entombed within its Ceramite skin until they are destroyed.
When the greatest of the Astartes are crippled in combat the Battle-Brother's body will be repaired and transferred into an armoured cyborganic sarcophagus outfitted with extensive life support systems.
The standard Castraferrum Pattern Mark IV or Mark V Dreadnought carries a heavy ranged weapon on its right arm and the left arm is equipped with a Dreadnought Close Combat Weapon.
The latter is usually a Dreadnought Power Fist or Power Claw with either a Storm Bolter or Heavy Flamer fitted below the forearm, or in the case of the Mark IV fitted to the side of its main chassis.
A Dreadnought is a cybernetic combat walker of intermediate size used by the Chapters of the Adeptus Astartes as heavy infantry support for their Space Marine companies.