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{{ImperiumPortal}}

[[Image:SisterInferno.jpg|thumb|right|200px|A [[Vigilator]] of the Silent Sisterhood]]

The '''Sisters of Silence''', also known as the '''Anathema Pskyana'''{{Fn|13}} or '''Silent Sisterhood''', are an ancient, anti-psychic militant order. They were the militant arm of the [[Adeptus Astra Telepathica]] during the [[Great Crusade]], and were internally referred to as the organization's ''Departmento Investigates''.{{Fn|12}} Together with the [[Adeptus Custodes]] they represented the [[Talons of the Emperor]] being the left hand of the Emperor.{{Fn|14}} Fragmenting after the [[Horus Heresy]], they were brought back under Imperial control by [[Roboute Guilliman]] in [[M41]].{{Fn|12}} Its ranks consist entirely of [[Blank]]s.

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==Sources==

*{{Endn|1}}: [[Horus Heresy: Collected Visions]]{{Cite this}}

**{{Endn|1a}}: pg. 152

*{{Endn|2}}: [[The Flight of the Eisenstein (Novel)]] by [[James Swallow]] {{Cite This}}

*{{Endn|3}}: [[The Voice (Short Story)]] by [[James Swallow]] — [[Tales of Heresy (Anthology)]]:

*4: [[Horus Heresy (game system)|Horus Heresy Collectable Card Game]]

**{{Endn|a}}: R ---- 1/-

**{{Endn|b}}: SG — 3/120

*{{Endn|6}}: [[Prospero Burns (Novel)]] by [[Dan Abnett]]: Cover illustration by [[Neil Roberts]]

*{{Endn|7}}: [[Watchers in Death (Novel)]] Chapter 9

*{{Endn|8}}: [https://www.games-workshop.com/en-US/Burning-of-Prospero-ENG Games Workshop]

*10: [[The Horus Heresy Book Seven]]

**{{Endn|10a}}: pg. 253

*{{Endn|11}}: [[Gathering Storm: Rise of the Primarch]] Part 3

*{{Endn|13}}: [[Watchers of the Throne: The Emperor's Legion (Novel)]] — Chapter 10

*{{Endn|14}}: [[Codex: Adeptus Custodes (8th Edition)]], pg. 9