[Source] The Rur crystal was a unique crystal that served as the computer core for the ancient Ordu Aspectu's space station-fortress, the Citadel of Rur. The crystal later became the vessel for the artificial intelligence of Eternal Rur, which the corrupted consciousness of the Ordu Aspectu's leader, Rur. Doctor Chelli Aphra obtained the cystal in 0 ABY during the twilight of the Ordu Aspectu.