It seems to me that it was in the nature of evil beings to lose their power over time, not gain it. The power would have to come from somewhere, as Inzil has pointed out regarding the Ring. "Power", spiritual potency or what have you does not appear to emerge ex nihilo in Professor Tolkien's work.
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"Since the evening of that day we have journeyed from the shadow of Tol Brandir."
"On foot?" cried Éomer.
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