The most potent and perhaps shocking power of the psychic Null however is that which makes them the perfect hunters and slayers of psykers; Untouchables such as the Sisters of Silence are almost impossible to affect with Empyreal powers.

But like many things that occurred during those early years of the Imperium, much of the extant record has become unknowable. They have only a startling void in place of that emotive, spiritual core that empowers and guides a typical Human. In the wake of the events of the Cataclysm of Pentacanaes, this account stands in blessed isolation in the Imperium's records in regards to the origins of the Sisters of Silence, and it seems certain to many observers that "9-13" and its bounty of Untouchables are all evidence the core upon which the remade Divisio Investigates was formed.

Doctors at Broadmoor, as well as Marjorie Wallace, had been pushing to have the girls sent somewhere less intensive and had finally secured a spot at Caswell Clinic in Wales in 1993. The Sisters of Silence's original purpose was to hunt and kill rogue Human psykers whose activities presented a terrible danger to the people of the newborn Imperium of Man and to oversee the tithe of psykers from every Imperial world to Terra.

The couple also had three other children: Greta was born in 1957, David was born in 1959, and Rosie was born in 1967.

They would be the first in a spreading network of vigils throughout the Imperium, each granted the explicit authority to carry out their ancient duties.

A 2016 interview with her sister Greta revealed that the family had been deeply troubled by the girls' incarceration. First among the Sisterhood's duties include ensuring the Great Tithe of psykers to Terra is adhered to. Under the eye of the Warmaster of Chaos, Abaddon the Despoiler and his 13th Black Crusade, countless worlds fell during their sector-wide campaign in the Segmentum Obscurus.Throughout her relationship with the silent twins, Wallace would note June’s apparent wish to distance herself from Jennifer, and Jennifer’s domineering ways. The Untouchables begin their gruelling duties as novices, and only once they have proved themselves worthy of the Sisterhood's high standards are they inducted fully.