The Well of Eternity (WarCraft: War of the Ancients, Book 1)

In the first chapter of this epic trilogy, the outcome of the historic War of the Ancients is forever altered by the arrival of three time-lost heroes: Krasus, the dragon mage whose great power and memories of the ancient conflict have inexplicably diminished; the human wizard Rhonin, whose thoughts are divided between his family and the seductive source of his now-growing power; and Broxigar, a weathered orc veteran who seeks a glorious death in combat. But unless these unlikely allies can convince the demigod, Cenarius, and the untrusting night elves of their queen's treachery, the burning Legion's gateway into Azeroth will open anew. And this time -- the struggles of the past may well spill over into the future...