Quicksilver's Knight
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The second book in the Heirs to the Warlock series by Christopher Stasheff, published in 1995.
From the Publisher:
"Geoffrey Gallowglass inherited psychic talent, physical strength, and fighting ability from his father Rod, the High Warlock of Gramarye. While he is a young man with great promise, his weakness for lovely and evil women could ruin him and Gramarye. Torn between a beautiful thief and a seductive witch, Geoffrey must choose carefully -- for one has his worst fate in mind."