People think necromancy is all "evil magic this, devil worship that" when the word itself really just came from Greek nekromanteia, where ancient Greek people tried to evoke spirits to, y'know, ask them stuff.
Throw an ashphodel flower into a burning bronze dish at the crossroads at midnight on a new moon (hail, Hekate) and boom, ya got yourself some necromancy!
Throw in some incantations for a little bit of spice, too:
"I adjure (exarkizó) you, corpse-daimon (nekudaimon) by the powerful and inexorable god and by his holy names, to stand beside me in the coming night in whatever form you used to have,
and inform me whether you have the power to perform the so-and-so deed, immediately, immediately; quickly, quickly"
And, you know, a ghost just might appear. Hopefully you have an offering so they're not mad!
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