Forgotten Weapon of War

Do you like one peice, Assassin Creed Black Flag and World of warship. A world(2x the size of earth) in which the water is like everywhere(cover 80% of surface and land area is still more then that of earth but distributed in many small island).

Our Hero get to this world of swordXmagicXshipXmedieval time period  with his own ship and a Battleship at that none other thenUSS Iowaat his command. But with no crew, no friends and no plan how is our Hero going to change this world.

That's a story to tell.