I dont really have a worst. Maybe Andrew Offett or Katherine Kurtz. Anyone remember that crap? Pretty lame stuff. I did not care for Zelazny either.
But, I will say this, Tolkien - The Lord of the Rings and Moorcock - Chronicles of the Black Sword may be the best fantasy ever written regardless of what people may think of the rest of their works. Hey, J.D. Salinger had one good book in him, but it was a doozy.
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*** FUD ***