I totally understand where you're coming from--it's so frustrating when your Google-fu fails.
Another thing I'd look into would be Spiritualism. There's a lot of crap out there regarding this subject, Sturgeon's Law is a bit truer here than usual, but a good chunk of Spiritualism is *all about* talking with the dead. In ancient times it *would* have been considered necromancy. If you can separate the crap from the jewels you'll be OK.
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As the water grinds the stone, We rise and fall As our ashes turn to dust, We shine like stars... --Covenant, "Bullet"
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