The Mysteries comprised a collection of age-old Sith rituals and acolyte induction ceremonies. They took place on the Sith World of Upekzar, specifically within five hallowed volcanic cave complexes that collectively formed the Circle of Visions. Each of these rituals and their respective locations centered on distinct themes and varied facets of the dark side. However, they all shared the common use of the rhak-skuri, a diplura variant. These creatures secreted pheromones that were known to induce nightmarish hallucinations in certain humanoid races.
Among the five Mysteries, the High Rites stood out, performed by the most powerful Sith Force users within an intricate cave system situated in Upekzar's moderate climate zone. The Cold Rites served as a means for practitioners to regulate their emotions and fortify their resolve. Lastly, the Rites of Fire were where acolytes channeled their rage and fervor to enhance their command over the dark side.