The Last Herald-Mage (Magic's Pawn, Magic's Promise, Magic's Price)

This is the Valdemar : Last Herald Mage trilogy which includes 1) Magic's Pawn (1989) in which an ancient age in the history of Valdemar comes to life--an age when the kingdom was ravaged by the ungoverned fury of bandit warlords, ferocious ice dragons, and the wild magic of wizards; 2) Magic's Promise (1990) in which the wild magic is taking its toll on the land, and even Vanyel, the most powerful Herald-Mage to ever walk the world, is almost at the end of his strength. But when his Companion, Yfandes, receives a call for help from neighboring Lineas, both Herald-Mage and Companion are drawn into a holocaust of dark magic that could be the end of them both; and 3) Magic's Price (1990) wherein Valdemar--the once-peaceful kingdom protected by the magic of its Herald-Mages--is now besieged on all fronts. The king lies near death, the neighboring land of Karse wages a relentless war against Valdemar, and the forces led by a master of dark forbidden magic are massing to strike the final devastating blow against the kingdom.