I think your best bet on getting a grasp on "necromancy" would be to study the way various cultures deal with the dead. Every culture has its own philosophies about death, dying and an afterlife. This portion of a cultures beliefs is about as close to necromancy as you're gonna get. Also try shamanism- soul craft -because it has a lot to do with dealing with the dead, preparing for death, and much more about general magick.
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