Despite exhaustive attempts at analysis, none could determine the nature of the super-hardened, onyx-like metals from which they were constructed. Some of them are packing serious firepower – literally in the case of the Cultist Firebrand – and all of them are ready to lay down their lives in service to the Dark Gods.

The pathways it led into were huge arterial routes that even starships could navigate -- they could accommodate the Imperial war machines of the Terran Crusade with ease. Cultists are being drawn to the space station like moths to a flame, swelling the Chaos Lord’s ranks with loyal servants to build these stable zones . However, unlike the other six known Blackstone Fortresses, this variant reshapes its own interior regularly and thus makes consistent mapping of the labyrinth near-impossible.Once he’s under your command, you can unleash the howling berserker on the hostiles within the Blackstone Fortress. The Will of Eternity was the Blackstone Fortress deployed by Abaddon the Despoiler during the final phase of the 13th Black Crusade against the Fortress World of Cadia. The power of the Blackstone Fortresses' Warp Cannons far surpassed even that of the Aeldari, the acknowledged masters of Warp-based technology in the galaxy.

Rogue Psykers amongst the greatest risks to the Imperium, for their latent powers can lead to daemonic possession or sometimes even full-blown warp breaches. A missionary zealot in the service of Taddeus the Purifier, Pious Vorne welcomes every opportunity to purge the unclean with fire – or should they resist, the chainblade of her holy flamer, Vindictor. Either the station’s devastating weapons systems destroy any ships that attempt to escape, or they are helplessly dragged into the ancient megastructure. As the fortress had been possessed by a portion of the mind of the Chaos God Slaanesh, Eldrad's body was destroyed, but his mind remained trapped within the construct.The Ninth Blackstone Fortress is another Blackstone Fortress discovered during the Era Indomitus that is located within the outer regions of the Ultima Segmentum. If the Aeldari myth-history of their gods is, in fact, a distortion and amalgamation of their race-memories of the Old Ones and the actions of the psychic beings which came into being through Aeldari faith, perhaps the Blackstone Fortresses are equated with the story of the 100 Swords of Vaul, the Aeldari smith god, forged for the bloody-handed god of war Khaine. Abaddon the Despoiler first learned of the existence of the Blackstone Fortresses and their potential power at some point in the 40th Millennium. Hey, these diseases are spreading and the clock is ticking, there was no time for formalities when it came to naming the quest!

Its weapon systems had been previously disabled by the attack of the Imperial Fists' star fortress Phalanx, but Abaddon found another way to transform it into a terrible weapon of mass destruction. And these aren’t your common or garden Spindle Drones that you’ll be facing – they’re Awakened Spindle Drones.The Blackstone Fortress Will of Eternity hurtles from orbit to strike Cadia during the 13th Black Crusade. Hailing from Obsidius Mallex’s warband, the Servants of the Abyss, these towering Chaos Space Marines became trapped alongside their lord when an empyric cataclysm caused their dread cruiser, Impaler, to become fused with the Blackstone Fortress. Yet the Blackstone Fortresses also exhibited advanced technology, such as void shielding and apparently inertia-less propulsion, that was very different from that used by the present-day Aeldari.