 In addition, Sursulapitschi is distressed because her fiancée, a "" (turtle man) named Ushaurischuum, has been assigned by her father to refashion the Crystal of Eternity, a task only possible with the aid of a creature of fire, with whom the merpeople are at war.Using the special properties of the cliffs' material, Jim and Luke convert Emma into a flying vehicle which they dub the "Perpetumobile" due to its unlimited means of locomotion.With it, they cross the Crown of the World to get .