The Future Upon Him by Donald Haynes

Apprentice Storyteller Cormac aspires no higher than to become a Master of Lore. His world changes forever when a Great Sword chooses him as Thane. At this moment, at this Great Turning of History, he must accept that the fate of his world, from the Sunrise Sea to the Sunset Sea, rests on his shoulders. Princess Orianna of the Seven Families called forth the sword. She must attend to the Thane. Together they set off to fulfill their destinies as they journey across the Land of Otherwhere.