Tolkien claimed in a letter that Sauron was enhanced while wearing the Ring he created. Assuming Durin's Bane had some skill in creating such tools it might be possible to augment his power even in a world of waning.
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"For believe me: the secret for harvesting from existence the greatest fruitfulness and the greatest enjoyment is - to live dangerously!" - G.S.; F. Nietzsche
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