The Celestarii were a Xenos-worshiping cult active in the Orpheus Sector in late M38. Born from the famine and bitterness of the preceding years which included the Black Crusade of Von Mallas, the Celestarii ranks swell among the nobles of the sector. While persecuted by the Ordo Hereticus and Adeptus Arbites, Imperial authorities are nonetheless able to eliminate the cult. The Cult's tenets maintain the Imperial Creed to be false while worshiping a secret race of superior beings which slumber, who they believe will one day awaken to bring immortality to their servants and death to all who oppose them (likely a reference to Necrons). The Cult takes alien artifacts as holy relics and carries out cannibalistic rituals.