Playing a key role in the Horus Heresy and preventing Daemons from over running Tera, the sisters of silence have made their mark throughout history!
Via our good friends at Lexicanum
The Sisterhood was overseen by three general officers: the Sister Commander, the Mistress of the Black Fleet, and the Nemesis Praxia. Below these were two distinct groups. The first was the Chamber of Oblivion which operated battlefield units led by Oblivion Knights and Knights-centura. The second was the Chamber of Judgement which fielded the dreaded silent judges of the Excruciatus.
The organization of the Sisters involved the splitting of its members into numerous cadres such as the Storm Blades each of which contained a different armour schemes. The largest primary operating unit of the Sisterhood was a Vigil, which contained approximately 1,000 sisters. The exact size of the Sisterhood at the end of Great Crusade is not known, though it numbered in the tens of thousands.
The Sisters of Silence’s origins are shrouded in mystery. However it is said that they first appeared during the early Great Crusade when the Primaris Psykers of the Astra Telepathica proved unable to properly control captured Psykers. A better solution was needed, and from this conundrum was born the Silent Sisterhood. An incident known as the Cataclysm of Pentacanaes may be tied to their formation. Others say that the origins of the Silent Sisterhood go back further to a lost agency of the Dark Age of Technology.
During the years of the Great Crusade, a cadre of Sisters were dispatched by the Emperor to aid the Death Guard in an attack on a Jorgall cylinder ship. Once there, they managed to wound a Jorgall mutant Psyker and capture it for transport to Terra.
The Sisters of Silence participated in some of the major actions of the Horus Heresy, including the defense of the Imperial Palace. They were perhaps most successful during the assault on Prospero, where a force of Sisters were deployed to provide specialised support for the attacking Space Wolves Legion. Due to their Untouchable nature, the Sisters were proof against the psychic attacks of the defending Thousand Sons Legion and provided a stable bulwark for the assault to be anchored upon. The Sisters of Silence were also vital in preventing Terra from being overrun by Daemons during the War Within the Webway.
