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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]] (staying on the left hand of the Emperor) 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.