Yah, with the corruption came a more limited evil power. For one, nothing was created to be evil. So they had to use up their own to create it. I wouldn't say that him being wounded by Fingolfin or enchanted by Luthian had anything to do with being lesser power. Even Mandos was affected by the songs of Luthian. The reason Sauron was destroyed when the ring was, is that he put all his spirit and power into the ring so it could control all the other rings.
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Instead of pepper spray, you pack a glass bottle and scream "Aiya Earendil Elenion Ancalima!!!" at muggers.
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