The Vallian Cycle [the Saga of Dray Prescot Omnibus #5] 1st edition

Four hundred light years from Earth, Kregen is a marvelous world, peopled by wonderful beings, filled with light and clamor and furor of life lived to the hilt. But Kregen has its darker side, where horror and terror batten on innocent people, where sorceries rend reason, where injustice denies light. Dray Prescot's happiness with Delia, the Princess Majestrix of Vallia, is threatened as the notorious Wizard of Loh, Phu-si-Yantong, seeks to destroy Delia's father, the emperor, and take control of the empire of Vallia. And Prescot is determined to seek the whereabouts of his daughters, alienated from him during a forced absence on Earth. But the brilliant world of Kregen under Antares will always challenge Prescot with new problems and adventures. Dray Prescot knows only too well that he must continue to struggle against himself as well as the malignant fates that pursue him in the mingled streaming lights of the Suns of Scorpio.