Pirates of the Frozen North
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"Frozen North", released on February 14, 2007, added the Norse Vikings faction and the Iceberg terrain type, as well as the Icebreaker and Longship ship types. Islands were numbered for the first time in this set. A mail-in promotion offered the "Nordic Raiders Pack" with the Serpent's Fang and Polaris ships and the Odin's Revenge unique treasure.