Blackstone is the substance which the Necrons use to create their star-spanning tetrahedral zones of stable space and is known to be highly resistant to the powers of the Warp. Blackstone is known to hold back Empyreaic energies, limiting both Psychic abilities and the manifestation of Daemons. Found in abundance on Tomb Worlds, the Adeptus Mechanicus under Belisarius Cawl in particular has sought out deposits for blackstone. Conversely, Blackstone can also enhance the effects of psychic powers. Blackstone can be tuned by specialized devices to either amplify or nullify the Warp.
The Imperium covets Blackstone, which some call "Pariah stone" due to its similar effect. Cawl and more ambitious members of the Mechanicum wish to mine enough Blackstone and empower it in order to create a shield against Chaos, perhaps subverting the growth of the Great Rift. The Necrons have been able to use Blackstone to create entire regions of space free from the touch of the Warp, such as the Pariah Nexus. Szarekh hopes to create this array on a galactic scale.
Further effects of Blackstone have been observed. Any living creature within the area of influence of Blackstone will find themselves afflicted with a numbing despair that only worsens with time until they become little more than a mindless husk - a perfect vessel for Necron experimentation on the reversal of biotransference.
Some time before 338.M41, the radical Inquistor Quixos developed an interest in the warp-altering properties of the Cadian Pylons, in the hope of permanently closing the Eye of Terror. Controlled through Quixos' enslaved daemonhost Cherubael, a cult calling itself the "Sons of Bael" studied the pylons. These studies bore fruit, and Quixos duplicated the pylons on other worlds using corrupted merchant cartels and personal supplies of Blackstone.[Needs Citation]
Unfortunately these plans never came to fruition as he was executed by an Inquisitorial taskforce led by Eisenhorn. It is unknown if Quixos' plan would have succeeded regardless - he was deeply addled by warp corruption and it was well within reason that his experiment could have instead torn the Eye of Terror asunder, which would have resulted in the Noctis Aeterna's devastation and the formation of the Great Rift almost six centuries early.[Needs Citation]
During the ten thousand years of the Long War Abaddon launched strategic strikes on worlds of the Galaxy rich in Blackstone, allowing for the expansion of the Great Rift following the destruction of the Cadia during the Thirteenth Black Crusade.
- 1: Codex: Necrons (8th Edition) pg. 11
- 2: Imperium Nihilus: Vigilus Defiant, pg. 90
- 3: Forgebane pg.2-13
- 4: Warhammer Community: Into the Pariah Nexus (posted 6/26/2020) (last accessed 6/27/2020)
- 5: Warhammer Community: Necron Lore - Playing the Long Game (posted 7/12/2020) (last accessed 7/13/2020)
- 6: Avenging Son (Novel) Chapter 26