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In The Book of Lost Tales, Part 1, Tolkien describes that when Elves die, they are reborn in later generations. Tolkien implies that there are a set number of Elves that neither increases or decreases.
Orcs are Elves that were desecrated by Melkor before the Valar became aware of them, so there must me a set number of Orcs. And when Orcs are killed they are reborn. I guess the real question should be are they reborn as Elves or Orcs?
Uruks, I've not read about thoughly so I don't yet know the origin of them only that they appeared out of Mordor in the late 3rd Age. The Encyclopedia of Arda puts this date approxiametly 2475. Does anyone know if any of the HoME series discusses Uruks?
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