Before the time of the Galactic Empire during the Age, the Sith Lord known as Momin commanded a band of acolytes to fulfill his ambitions related to the dark side of the Force. He made use of these followers, in addition to the assets he received from his own Master, Darth Shaa.
The first appearance of Momin's acolytes occurred in a flashback within the 2018 canon comic book, Darth Vader (2017) 22. Charles Soule was the writer of this comic, while Giuseppe Camuncoli provided the illustrations.