from what i know of them they are Maiar of morgoth therefore they should be a as intelligent and able as any of the wizards, however that is not the impression you get when you read the books or watch the film. what are your thoughts?
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I would definitely think they are intelligent as they were Maiar after all, and they definitely had the potential to be as smart as any of the wizards, but for example with Durin's Bane, he was underground and alone for five millennia, I would definitely think that would have some effect on it!