From Lexicanum

The Noosphere is a type of technology developed by the Adeptus Mechanicus sometime before the Horus Heresy.

The secrets of noospheric communication were first uncovered by the Explorator Adept Laszlo who was the teacher of Adept Cacyce who in turn was the mentor of Koriel Zeth. Before the union of Mars and Terra, Laszlo often made a number of expeditions to mankinds birth world in order to recover lost as well as forgotten technologies. Going to the lands of Gyptus in the crater Kebira where Laszlo discovered a great tomb complex that had been guarded jealously by the Gilf Kebir. One of the many things discovered within the vast selphcures of the ancients there were the designs of the noosphere.

The technology was further developed by Koriel Zeth in Magma City as well as shared between her allies such as Adept Ipluviel Maximal and Fabricator Locum Kane. Access to the noosphere allowed a techpriest to view information in its purest form and had been regularly used by Adept Zeth and her servants. During the Death of Innocence, the virulent scrapcode infected the Martian datanets leading to untold devastation across the planet. However, the infection did not corrupt Magma City or its allies due to the unique nature of the noosphere. This led to Fabricator General Kelbor-Hal dispatching his ambassadors to Magma City in order to acquire both the technology and Adept Zeths intentions.¹

Source

• ¹:Mechanicum (Novel) by Graham McNeill (pg 119-120, 197)

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