Sibyl was an impressionable female individual. At some point during galactic history, Sibyl encountered a pair of traveling priests from the Cult of Veroleem in a starport and she agreed to travel to the distant planet Veroleem and become a new recruit of the cult. However, on arrival on Veroleem, Sibyl and a number of the cult's other new acolytes were taken to a temple in the Coreesh Mountains on Veroleem and imprisoned, and the cultists planned to kill them to manufacture an elixir of immortality. However, one of Sibyl's distant cousins and the individual's associates tracked her to Veroleem and rescued her from the cult's clutches.