Injured kaiju started to retreat to the ocean. Your shogun will have none of that, and has ordered a pursuit to end the kaiju siege once and for all. You readied your atakebune warship and prepared your troops for a battle at sea. This expansion for Kaiju Siege comes with an alternate game board and 4 new kaiju. Battles may now take place out at sea, where your workers run the risk of falling overboard, and the kaiju can damage your ship's hull and cause it to spring a leak. This understandably introduces a new losing condition - your ship can sink! The four new kaiju are also compatible with the game board from the base game. The base game is required in order to play this expansion.