The Apprentice Adept series is a seven-book fantasy and science fiction series by Piers Anthony. The series takes place on two worlds occupying the same space in two different dimensional planes: Phaze - a Magical Land in Medieval Stasis and more or less ruled by the Adepts, the strongest magic users, each specializing in a separate aspect, and Proton, a barren mining planet of high technology, [...] [tvtropes.org]