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When an exorcist performs his duties and performs them well, the power he and his possessed host feels is the power to cast out one of the most powerful things known to mankind: Demons and their ilk. You're performing the work of God; you're placing God inside a person or place where He has previously been cast out.

Some exorcists claim they have no power and that they're merely a conduit...but you're free to view it any way you like.