wights; mewlips, nazguls, barrow

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i know barrow wights can only be killed by the sun, but does this apply to nazguls and mewlips (other wights) as well?

also, what made the nazguls so fearsome?

obviously they were magical, but (like with the rings) it is unclear to me exactyl what this magic did that makes them formidable besides their powers of perception.


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