Lots of what Rowling uses is just from old mythlogy that she changed to make her own. That isn't a bad thing. Its not like Tolkien came up with everything in his books, he took ideas from other stories and myths and made them his own. Its almost impossible to right a good book and not have something in it thats from another story.
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similarity between the Nazgul in LotR and the dementors in HP
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The only similarity is that they're hooded black figures. What they do is completely different.
~Wilwa