From the introduction in the book:
CHART A COURSE
The World of Wyldrvir heads out to sea with this expansion! Time for your band of travelers to become a scurvy crew of ship-shape buccaneers. Setting out further than the confines of the leader's journey to adventure where few others have. While the port of Meratoll acts as the border of the main continent and the World Ocean, as many crews set out further, they come across a new world of mysteries, buried treasures, and even deeper buried secrets. As you and your crew seek out what the World Ocean has to offer beneath the waves best be prepared for Wyld Sea monsters, new rivals, and powerful artifacts. Of course, if you overcome these new
challenges you'll be rewarded with new and amazing treasures, allies, and stories to tell when you port back home, and what could be better for any crew than the tales you will get to tell your friends and family.