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Blue wizards? If Sauron had somehow managed to trap Alatar's and Pallando's spirits, would he use them to guard the tower? Surely it was an important border place, but with Shelob already there, it feels like a huge waste of resources.
In general, I think the watchers were originally "ordinary" watch statues made by Númenóreans of great craft and skills and Sauron then set some evil spirits or some of his own power in them and thus made them "alive".
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Like the stars chase the sun, over the glowing hill I will conquer
Blood is running deep, some things never sleep Double Fenris
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