The Warlock Unlocked

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Book four in the Warlock Of Gramayre series by Christopher Stasheff, published in 1979.

From the Publisher:

"In Gramarye, where everyone who is anyone is a witch, and where Rod Gallowglass has only just begun to learn of the awesome powers he possesses, a battle between worlds has begun. In the fight to preserve freedom, Rod is about to learn if his strength will be enough to save his precious world -- and all democracy -- from destruction."