Blackstone Fortress

From Lexicanum

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The Blackstone Fortresses were originally created as weapons in the first war against the C'tan, and were known to the ancient Eldar as the Talismans of Vaul. To capitalize on the C'tan's vulnerability to Warp attacks the Fortresses were equipped with a Warp-Cannon that could create a devastating rip in space and an eruption of energy out of the Immaterium. Somehow six Fortresses out of however many that were originally created were left abandoned and drifting in Imperial space in various systems through the Gothic Sector, and were given the name Blackstone Fortresses when humans discovered them and incorporated them into their system infrastructure.

Two have since fallen into the use of Chaos, and have influenced two of the major wars in the Imperium. Four were destroyed by the C'Tan Deceiver.

The Gothic War

Over the course of history, the various Blackstone Fortresses were abandoned. Six Fortresses were discovered in various systems of the Gothic Sector, and were claimed by the Imperium, modified and integrated into the defence infrastructure of the various star systems.

The Fortresses were dormant, easily boarded and occupied. Although unactivated, there was enough residual power in their power grids to allow the humans to live in them and turn them into powerful spaceborne hardpoints that were central to the fortifications in the systems they occupied.

However, during the Gothic War, Abaddon managed to use a pair of ancient devices he had recovered to rouse the Fortresses and bring them under his control. Once awake, they were able to shed their grafted-on Imperial equipment and glide slowly through space under their own power, using their Warp-Cannon in place of the turrets and fighter bays the Navy had built onto them. There is also a record of a boarding party that made its way into one of the activated Fortresses and described it as like a living thing, pulsing with power. As the war progressed and Abaddon acquired three Fortresses, he was able to combine their Warp-Cannon attacks to obliterate worlds and stars.

At the end of the Gothic War, Abaddon retreated into the Eye of Terror with two activated Blackstones, while the remaining four in Imperial custody simultaneously disintegrated.

The Thirteenth Black Crusade

In the 13th Black Crusade, Abaddon used two Blackstone Fortresses against the Imperium. One of these was used to attack the world of Cadia, obliterating Cadians and Chaos troops on the surface indiscriminately. The Blackstone Fortress was attacked by Eldar and Imperial battlefleets, but both took huge losses from the Chaos fleet guarding the structure. Eldrad Ulthran boarded the Fortress, and attempted to remove the taint of Chaos, and turn the Fortress back to Eldar control, but failed, and is believed to have been consumed by Slaanesh. After this, the Fortress stopped attacking Cadia and concentrated on its own defence. (It is uncertain whether it was Eldrad's boarding action or the attack of a Necron fleet that caused this.) Although the Necron fleet was destroyed, the Fortress left Cadia.

There are unconfirmed reports of the other Fortresses being discovered and destroyed by Necron raiders.