The Summer Tree (Fionavar Tapestry‪)‬

Two-time Aurora Award-winning author Guy Gavriel Kay has been nominated for the World Fantasy Award three times. In the first book of his Fionavar Tapestry series, five college students meet a wizard who takes them to the heart of the first of all worlds-a place called Fionavar. The students soon discover that they have been pre-ordained as part of the pattern called the Fionavar Tapestry-and if they don't fulfill their destinies, the world will suffer devastating consequences.