This expansion requires the CATAN base game and the Cities & Knights Expansion to play. It introduces a new narrative-driven challenge where players defend Catan from an invading army on the northern shores. The expansion includes three interconnected scenarios, each adding unique strategic elements to the gameplay. Designed for experienced players, it enhances the Cities & Knights Expansion with deeper mechanics and evolving tactics. The chapter-based structure supports a campaign-style experience, allowing groups to progress through multiple sessions with continuous strategic development.