"The Arnor blade had a counter spell that attacked something specific in the Witchking. It was about the knitting of will to undead flesh. I don't recall normal metal ever having such an imbued property in the mythology. Do you? There's part of the invulnerability addressed, by a specific reference to Lore. You may argue what a normal blade would do, and if any effect can be imputed of 'any' blade to 'knitting' (I don't think it's easy to knit a scarf with a blade)"
I don't think that any sort of "invulnerability" is implied, though. Suppose Alice were to stab Bob with a poisoned knife: the fact that the poison harms him doesn't imply that he's invulnerable to stab wounds!
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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