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Necromancy is a practice involving the use of paracausal abilities to resurrect the dead. It is considered by Oryx's Hive to be a violation of The Sword Logic, and therefore forbidden; however, it has been employed by the heretical Hive Prince Nokris, who was taught the secrets of necromancy by the Worm God Xol. Xol himself used necromancy to resurrect several individuals of various races who had been slain by the Guardians, including Valus Ta'aurc, Drevis, Wolf Baroness, and Urzok, the Hated, before Taking them and converting them into Ta'aurc, Aspect of War, Drevis, Aspect of Darkness, and Urzok, Aspect of Hate respectively. Many of Savathûn's Hive have the title "Revenant" attached to their names, suggesting that Savathûn and her subordinates also employ necromancy.
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