Merlin was imprisoned in a cave (or a tree, depending on which legend you look at) by the enchantress Nimue (also called Vivian, Viviane, and a bunch of other names), and there he waits until Arthur needs him again (which, presumably, will be at the Battle of Camlann).
True, Tolkien didn't like allegory, but these are hypothetical comparisons. We're just imagining which races in the real world would compare to certain races in Middle-earth.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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