The Warlock Heretical
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Book eight in the Warlock Of Gramarye series by Christopher Stasheff, published in 1987.
From the Publisher:
"Enemies of peace are planting the seeds of rebellion on the planet Gramarye, striving to tempt the clergy with visions of power and incite them to war against the throne. Only the warlock Rod Gallowglass can stop them -- or suffer the grim fate of a heretic! From the author of The Warlock in Spite of Himself and The Warlock Unlocked."