The alien world of Mer is being devoured by an evil substance known as Dark Water. Only Ren, a young prince, can stop it by finding the lost Thirteen Treasures of Rule. His loyal crew of misfits that help in his journey are an ecomancer (Tula), a monkey-bird (Niddler), and a treasure-hungry pirate (Ioz). The evil pirate lord, Bloth, will stop at nothing to get the treasures for himself and provides many obstacles for Ren and his crew.