"The Necromancer"

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The other night I picked up my copy of Home X, Morgoth's Ring, browsed it randomly and started reading from The Later Quenta Silmarillion. And happened to come across a part that hints at why Sauron is called the Necromancer.

Here Tolkien writes about the Elves, their potential re-birth and what happens when they suffer a physical death. He writes that if an Elf is killed, their soul, or fëa, is summoned to the Halls of the Dead in Mandos where it would receive correction, instruction, strengthening and comfort, until it (that individual) was deemed to be fit for a re-birth into a new body.

But the summons of Mandos were sometimes refused, and as he could not, or would not, force the fëa to enter the Halls of the Dead, lots of fëar would remain in Middle earth.

Originally Posted by HoME X

[they would] wander houseless in the world, unwilling to leave it and unwilling to inhabit it, haunting trees or springs or hidden places that once they knew. Not all these where kindly or unstained by the Shadow...

Some are filled with bitterness, grievance, and envy. Some are enslaved by the Dark Lord and do his will still, though he himself is gone...
... To attempt to master them and to make them servants of one own's will is wickedness. Such practices are of Morgoth; and the Necromancers are of the hosts of Sauron his servant.
Some say that the Houseless desire bodies, though they are not willing to seek them lawfully by submission to the judgement of Mandos. The wicked among them will take bodies, if they can, unlawfully ...
... 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