Horcruxes are the best bit of world building that J. K. Rowling did. So much better than rings of power or Faustian bargains or Dorian Gray mirror. You need narrative specificity to characterize evil. Abstract malignity does not really work well.
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Do you mean because it was the villains actual soul rather than just some power boosting gadget..?
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It is more psychologically realistic. Squares with narcissistic wound theories, Jungian shadows etc.

