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From Warhammer 40k - Lexicanum
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Their ranks consist of psychic servants of the Imperium and these psykers have undergone the [[Soul Binding]] ritual with the [[Emperor]]. This process passes on some of the Emperor's strength of will into his servants, thus protecting them from evil, psychically attuned enemies. The ritual ultimately results in blindness though there are a rare few Astropaths who are judged strong enough to warrant them not taking part in the Soul Binding. These individuals are considered the lucky ones, as they do not have to partake in the agonising process as most Astropaths.{{Fn|5}}
It is through the righteous persecution of the [[Inquisition]], combined with the careful testing of the '''Coven Masters''' of the Adeptus Astra Telepathica which purges any deviant mutations that are commonly associated with those beings that develop psychic potential.{{Fn|1a}} Under Imperial edict, they are allowed their own operatives but they were prohibited from serving as wardens aboard their own vessels. This is because it was far too easy for a malignant psyker to coerce the mind of another telepath. Thus, they used the [[Sisters of Battle]] or [[Inquisitorial]] [[Storm Troopers]] to serve as custodians aboard the Black Ships where their faith protected them from the predations of the mind-witches they guarded. Meanwhile, highly trained [[Black Sentinels]] were used to guard important Telepathica facilities.{{Fn|3}}{{Fn|15}}
Before the end of the [[Horus Heresy]], this division within the Imperium held the '''[[City of Sight]]''' as its headquarters where psykers were taken to its mindhalls for testing. Inside these iron clad halls, the psykers took their first steps in the soul binding ritual and further recruitment into the astropathic choirs.{{Fn|2}}
*{{Endn|13}}: [[Warhammer 40,000 8th Edition Rulebook]], pg. 39
*{{Endn|14}}: [[Imperium Nihilus: Vigilus Defiant]], pgs. 1-5
*{{Endn|15}}: [[Praetorian of Dorn (Novel)]] — Part 4, Chapter 2
===Uncited===