Inhabited by different Clans, Islands on the Great Sea breed traders, warriors, and leaders. One might see the Islands as an opportunity for political connections, but a witcher or a mage would rather travel there to train, hunt monsters, and seek an adventure. It may be of great benefit to visit Skellige Islands, as well as other, unexplored ones, but such travels rarely come without a cost.
You get a sizable Board extension with all-new locations and location tokens. Your map gets bigger and more interesting. There is a special way to travel to the Islands by using Ship miniatures, and each travel always comes with a new, sea adventure. There Is a special Deck of Exploration and Event Cards just for that Expansion, and some of them may result in Dagon, an ancient monster, being summoned.