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as it was told that no living man could kill the Witch-King
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No it wasn't. Glorfindel's prophecy was:
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Originally Posted by Gondor and the heirs of Anarion, Appendices, LotR
Far off yet is his doom, and not by the hand of man will he fall.
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This does not state his invulnerability; it is a prophecy. Theoretically he can be killed by anyone; practically, he will fall, but not by the hand of a man. Even Melkor, the mightiest foe ever, feared for his body; if he couldn't make himself invicincible, how could a mere ringwraith, a mortal after all? And, according to Myths Transformed, Melkor's fear was founded, since he was finnally executed before being thrust out into the void.