The Last Herald-Mage (A Valdemar Omnibus‪)‬

Vanyel has been born with near-legendary abilities that, if left untrained, may prove a menace not only to Vanyel but to others as well. So he is sent to his aunt, Savil, one of the fame Herald-Mages of Valdemar. Soon he will become the focus of frightening forces and raw magic. And by the time Savil seeks the assistance of a Shin'a'in Adept, Vanyel's wild talent may have already grown beyond anyone's ability to contain, placing Valdemar in desperate peril.