The Warlock's Last Ride
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Book thirteen in the Warlock of Gramarye series by Christopher Stasheff, published in 2004.
From the Publisher:
"THE FINAL ADVENTURE IN THE PHENOMENAL SERIES"
"After an incredible 35-year run, the story of Rod Gallowglass — The Warlock in Spite of Himself — comes to its fantastic finale in the weird and wonderful world of Gramarye. When Gwendolyn — the witch-wife of Rod Gallowglass, the Lord High Warlock of Gramarye — suddenly dies, she leaves behind a husband dangerously unhinged by grief and a land without a Protector."