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From Warhammer 40k - Lexicanum
→History
At the time of the Great Crusade, the Adeptus Astra Telepathica had a militant arm - the [[Sisters of Silence]] - who manned the blackships and searched for emerging psykers. It is unknown what happened to the order after the events of the [[Horus Heresy]].
During [[Goge Vandire]]'s [[Reign of Blood]], he quickly ascended to the position of controlling the Imperium. However, one of the few obstacles in his path was his attempts at gaining control of the Adeptus Astra Telepathica. This was because the [[Master of the Adeptus Astra Telepathica]], Lord [[Phaedrus]], was a potent psyker and thus not swayed by Vandire's charisma. This allowed him to see through his deceit and machinations which was troublesome for Vandire as he used his abilities to stay one step ahead of him. Thus, he attempted to find a means of dealing with this threat as he could not assassinate Phaedrus as he would be replaced with an equally powerful psyker. This led to him using a [[Culexus]] [[Assassin]] of the [[Officio Assassinorum]] to rob the psyker of his abilities whilst using a life support system to keep him alive. Robbed of his power and prevented from killing himself, Lord Phaedrus agreed to follow Goge Vandire on the condition that none knew of the loss of his psychic abilities which led to the subversion of the Adeptus Astra Telepathica.<sup>7-p24</sup>
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.<sup>1-p90</sup> 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.<sup>8-p20</sup>