Wave of the Sea Dragon: A Branches Book (Dragon Masters #19‪)‬

Drake, Bo, and Opeli seek the help of a powerful Sea Dragon in the latest adventure in this action-packed, New York Times bestselling series!The evil wizard Astrid is ready to cast her dangerous False Life spell! To undo the spell, Drake and the other Dragon Masters will need the help of three special dragons -- including a Sea Dragon. So Drake, Bo, and Opeli travel to the island of Kapua to find one. But the Dragon Masters have stolen something from Astrid... And Astrid will battle them to get it back!