Shenna knows Revellis is in trouble, and now Eien could be next. Both the Stonetree Arch and the twelfth gate have been oddly quiet, leaving Shenna to suspect the worst. Aramil is determined to take control of the cycle between Eien and Revellis, and Shenna might be the only one who can do anything about it. When nearly all of the Kwendi pass through the gate into Eien, her fears are confirmed. She must go to Revellis and reunite with old friends before Aramil destroys the balance. Except Revellis is all but lost, and it'll take sailing across an ocean filled with monstrous beasts, flying over a new continent on winged gryllids, and defeating Aramil's army of ghostly, hollow men if they hope to find the world's most sacred treasure—the Fallen Gate. Only the Fallen Gate can bestow enough Vigor to save them. Shenna and her friends must rely on each other's strengths, gain help from new friends itching to wake a lava giant, and muster their courage to face Aramil in a race for all life as they know it.