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From Warhammer 40k - Lexicanum
→History
In the [[Age of the Imperium]], the destruction of the planet [[Tyran]] led to the growing discovery of the extragalactic aliens that became known as the [[Tyranid]]s. Among the mounting evidence being assembled included scraps of tissue from the [[Thandros]] Telepathica Matrix.{{Fn|1b}} Following the re-emergence of the world of [[Toreus]] after it was engulfed in a Warp rift, a team of archeodiviners were dispatched to the planet where they were overwhelmed by the Chaotic taint who all died from exposure to it.{{Fn|7}}
Following the creation of the [[Great Rift]] the light of the [[Astronomican]] temporarily went out and a scream of [[Chaos]] enveloped much of the galaxy. In the ensuing mayhemknown as [[The Blackness]], enormous numbers of Astropaths went mad.{{Fn|14}}}
==See Also==