Quote:
necromancy (n.)
c. 1300, nygromauncy, "divination by communication with the dead," from Old French nigromancie "magic, necromancy, witchcraft, sorcery," from Medieval Latin nigromantia (13c.), from Latin necromantia "divination from an exhumed corpse," from Greek nekromanteia, from nekros "dead body" (from PIE root *nek- (1) "death") + manteia "divination, oracle," from manteuesthai "to prophesy," from mantis "one who divines, a seer, prophet; one touched by divine madness," from mainesthai "be inspired," which is related to menos "passion, spirit" (see mania). Spelling influenced in Medieval Latin by niger "black," on notion of "black arts." Modern spelling is a mid-16c. correction.
However, it has come to be associated with raising the dead. In and of itself, this may not be an evil act. For example, the spell "Raise dead" is how you bring a dead PC back to life. Most people see that as a good thing. Turning a dead person into a mindless ghoul is usualy considered a totally different thing. This is why clerics have the grave domain, which is necromancy for the purpose of protection from the undead for the living and giving souls a peaceful rest in the afterlife.