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I think a lot of what Tolkien wrote about burial mounds comes from myth and folklore. The ancients worshiped such places as entrances to the underworld. If the person buried within was pure, then so was the mound, and it was an entry to paradise, if on the other hand the person was evil, then it was a place of dread. We see this after The Witch-King corrupts Tyrn Gorthad.
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