North of Pland and the city-state of Rensa, beyond the bustling "Great Cross Route," an eternal and cold breath loiters over the seascape known as the "Chill Sea." Under the influence of this seemingly never-dissipating mysterious cold air, the entire Chill Sea displays a visage distinct from other places.
Here, the sea water shows a profound quality starkly different from warmer regions. Tiny ice fragments often appear where currents meet the islands. Periodically, colossal icebergs rise from below the sea surface, forming temporary barriers or movable lands. These serve as navigational markers or emergency shelters for some sailors making their living in the Chill Sea. Various mysterious cold fogs, icy winds, and phantasmal light phenomena add unique scenic features to this cold maritime area, bringing countless bizarre legends that impart a mystical aura to the two major city-states of Frost and Cold Harbor.