The Frost class longship is a ship available from shipyards. Its construction requires a design only available from trading posts. Frost class ships will have one of the following adjectives in their name: Arctic, Bitter, Bleak, Brisk, Chilly, Cold-blooded, Crisp, Frigid, Frost-bound, Frostbitten, Frosted, Frosty, Frozen, Glacial, Icy, Nippy, Numbing, Polar, Shivering, Snowy, Wintry.