Known as the Thrice-Born and the Daemonifuge, Ephrael Stern had been promised by her parents before her birth to the Adepta Sororitas. She was raised on the planet Antigone's Harbour by the Saint Sabbat Schola Progenium. The Arch-Drill Abbot of the school submitted the young Ephrael for induction within the Sisterhood and was accepted by Sister Patricia from the Order of the Holy Seal. The Novice Stern excelled at her new monastic duties as a Battle-Sister-in-training.
She eventually completed her training and along with 500 other Novices took her sacred Oaths of Adherence at the Ecclesiarchal Palace on Terra. Sister Stern was then chosen to become a member of the Order of Our Martyred Lady. Shortly after her induction into the Order, she was sent to the Ecclesiarchy Cardinal World of Ophelia VII. Whilst stationed there, her exemplary service record helped elevate her to the esteemed ranks of the Order's Seraphim within record time. Only three years later she would be ordained as a Sister Superior.
Sister Stern was eventually sent on a mission on behalf of the Order, to investigate a lost convent of Sisters of the Orders Pronatus on the world of Parnis. There, Stern and her Sisters discovered what had become of their fellow Sisters. A powerful Greater Daemon of Slaanesh (a Keeper of Secrets named Asteroth) had been freed from its bonds and destroyed the convent. He then took the ruined bodies of 700 Battle-Sisters and forged them, body and mind, into a terrifying construct of living flesh known as the Screaming Cage. Though the fallen Sisters were forced to share their torment and suffering, the daemon failed to take into account that they were also able to inadvertently share their faith as well.
As the daemon sought to kill the remaining Sisters sent to investigate the convent, Ephrael Stern fell in battle. Seizing this one chance, the fallen Sisters within the Screaming Cage used their combined powers to bring her back to life -- filling her with the full might of their combined faith in the God-Emperor to combat the Forces of Chaos. Once returned to life, the resurrected Stern was told to flee as the fallen Sisters hid her presence from the daemon and its Chaos servants.
Stern's memory of these events was erased. She was the only one who managed to return to her Order on Ophelia VII, being the sole survivor of the expedition to Parnis, her sanity stretched to the limit. Her seemingly unnatural power made her the object of suspicion amongst members of her Order, with many of her Sisters viewing her as having been corrupted by the Ruinous Powers. Stern was placed within a holding cell for four years until her exact nature could be determined.
At this time she was attacked by a Sister who was being controlled by a daemon of Slaanesh to silence her. But the enraged Ephrael managed to defeat her attacker with her bare hands. This set new events into motion. An Inquisitorial investigation, under the command of Inquisitor Silas Hand, was sent to the Order on Ophelia VII to investigate the sole survivor of the Parnis Expedition. Whilst at the Sanctorum, Stern underwent numerous trials to test her purity and ensure that her soul was free from corruption.
Not found wanting during these trials, Sister Stern was declared uncorrupted and was reinstated within the ranks of her fellow Battle-Sisters, and granted her former position of Seraphim and rank of Sister Superior. Inquisitor Hand, not fully trusting Sister Stern, nevertheless took her with him to investigate the former convent on Parnis. During the investigation the fallen Sisters of the Screaming Cage finished their holy work -- pouring all of their remaining knowledge and power into Sister Stern to fight the corruption of Chaos. Inquisitor Hand sacrificed himself to defeat Asteroth and banish the daemon back to the Warp. Sister Stern went missing after this second expedition, once again being the sole survivor.
Hunted by both the Imperium as well as the Forces of Chaos, Stern remains aloof from both. She has even sacrificed herself, stabbing herself in the heart, to escape the foul machinations of the infamous Sorcerer Ahriman of the Thousand Sons Traitor Legion. Resurrected once again by the power of the faith within her, Stern finally embraced her power and used it freely for the first time.
With these newly embraced abilities, Stern as the Daemonifuge has managed to even defeat a Culexus Assassin that had been sent to kill her by the Inquisition. Ephrael Stern was last seen traveling with a mysterious Aeldari known as the Pariah to the fabled and forbidden Black Library, using her abilities to access the vast conduits of the Webway. Though the Ordo Hereticus has issued orders for her destruction, some members of the Ordo secretly believe that she might represent humanity's greatest hope since the legendary Primarchs. Her current whereabouts remain unknown.
- Daemonifuge (Graphic Novel)