From the back of the book:
At the dawn of time, a war between gods and titans left the landscape of Thylea forever changed. Thousands of years later, the first mortals arrived, carried by ship and dragon. The Dragonlords were the champions who overthrew the Titans 500 years ago and forged the Oath of Peace. But the power of the Oath has waned, and now the Titans seek vengeance. You are one of the heroes called by prophecy to end the conflict once and for all. Poets will sing of your deeds for centuries to come... if you survive.
Odyssey of the Dragonlords is an epic fantasy campaign for the 5th Edition of the world’s greatest roleplaying game. The adventure is set on the lost continent of Thylea, which is inspired by the greatest legends from Greek mythology.