[The Saucepan Man]

Or the Houseless may plead for shelter, and if it is admitted, then it will seek to enslave its host and use both his will and his body for its own purposes. It is said that Sauron did these things, and taught his followers how to achieve them.

Well, that sounds more like possession of the living by Sauron and his followers that necromancy. Although it is similar in nature to the Haitian voodoo tradition mentioned by Ransom and Rumil earlier in this thread, so perhaps there is a conncetion.