I have a copy of "The Witching", but i'm not sure if it's the same as "Necromancy". The film is very strange itself. It has a bunch of mumbling in the film. When Orson Welles talks, his voice is all mumbly and really is terrible. It also has a lot of nudity, and I don't know how it had a PG rating. It also has a lot of Satanism in the film.
It has rituals and a bunch of strange, wicked things. For me, I think it's okay, but not the best horror film to see. Very odd with the story and really is messed up. It's about a woman and her husband go to a town called Lilith, and no children are allowed there. Because Mr. Cato(Orson Welles) wants it that way.
You better watch the film if it sounds interesting to you. But it contains a lot of nudity and satanism, witchcraft, bringing the dead to the living and the living to the dead, and just messed up.