Oblivion Knight-Centura

Drawn from the elite ranks of the Chamber of Oblivion, the Oblivion Knights-Centura serve as the battlefield commanders of the Sisters of Silence. Elevated as a result of their seniority, martial prowess and power as Psychic Nulls, they are afforded use of the rarest (And we mean new ways to shag the Thousand Sons) weaponry the Sisters of Silence can bring to bear and charged with the inviolate duty of commanding both the tactical operations of the Great Tithe and the sworn duty of destroying rogue psykers deemed too dangerous to live. As you can already tell they are one of the leaders of the Silent Sisterhood.

Each Oblivion Knight-Centura is the unquestioned mistress of her own mission force through not only the strict customs of the Order but the trust placed in her abilities by those under her command, a respect earned over perhaps decades of active service, their mortal lifespans extended by the same alchemical treatments by which the nobility of Terra sees out centuries of life despite their mortal birth. While never a codified sanction, Sisters of Silence showing marks of age and long service, either psychologically or woven in with the subtle marks of their panoply, are often informally revered by their peers for their ability to survive and their knowledge, even if both were formally at the same rank within the command structure.