necromancy -
Loosely, any sorcery or witchcraft, especially involving death or the dead, particularly sorcery involving raising or reanimating the dead.
Wikipedia
Necromancy (Greek νεκρομαντεία nekromantía, via Latin necromantia) is a form of magic in which the practitioner seeks to summon the spirit of a deceased person, either as an apparition or ghost, or to raise them bodily, for the purpose of divination. In Renaissance magic, necromancy (or nigromancy, by popular association with niger "black") was classified as a forbidden art, and Johannes Hartlieb (1456) lists demonology in general under the heading. The word necromancy derives from the Greek νεκρός (nekrós), "dead body", and μαντεία (manteía), "prophecy, divination".
OmegaWiki Dictionary
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necromancy A form of magic involving communication with the deceased for the purpose of divination.
