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Well an Elf who refused to join Mandos was evil so they just drifted about without a body. It was deemed dangerous to communicate with said spirits as you be in peril of being deluded by fantasies or lies, and also they might take control of the living person's body and become, zombies I suppose. Its very fascinating as Tolkien lays the blame of all those bad stories about Elves you hear in folklore due to these spirits. Like children being kidnapped and the like...
Anyway Sauron was a master of communicating with these evil elven ghosts and taught this trick to followers. It is therefore not unlikely Sauron created Elvish zombie type things by giving these 'houseless' Elves what they desired - a body.
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As Beren looked into her eyes within the shadows of her hair,
The trembling starlight of the skies he saw there mirrored shimmering.
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