We agreed that she is NOT a naaru. It's one of the few things she can't be.
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Oh, what if they made the titan of Azeroth but Azeroth the titan realized it's being corrupted by the Old Gods so used the Well of Eternity to "seed" the White Lady moon with its essence to create another titan? And that's the whole thing, Azeroth the titan is dieing, but Elune came to be.