Odyssey of the Dragonlords (5e): Hardcover Adventure Book - Rules of Play says:

Odyssey of the Dragonlords is a 460 page hardback adventure book for 5th Edition, packed with full-color maps and illustrations. Join with other prophesied heroes to undertake an epic quest to save the world of Thylea, sail the islands of the Forgotten Sea, and battle the Titans! The adventure will take a party of heroes from 1st to 15th level (or higher).