Based upon the same STC data as the Baneblade and Deathhammer super-heavy tanks, which are a mainstay of the vast brigades of the Imperial Army, the Fellblade is a more advanced variant that first saw widespread service with the Legiones Astartes in the last decades of the Great Crusade.
It is most noted for its use of Mechanicum atomantic arc-reactor technology and a reinforced metaplas alloy chassis superior even to that of the Baneblade, alongside an advanced accelerator cannon as its primary armament. These systems are all fruits of Dark Age technologies rediscovered and restored to humanity shortly before the nightmare of the Great Heresy.