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Necromancy is not a spell, but a skill (ritual). It has nothing to do with raising the dead (a combat spell), since the latter is essentially just a special version of resurrection: we revive corpses into corpses, while with the living, we temporarily prolong their life; unlike this, necromancy transforms dead living beings into living corpses, i.e., it changes their quality. In addition, necromancy does not consume mana.
And I'm saying that these are some mysterious KNOWLEDGE! ;)
Sincerely, Psatkha