In an endless sea of sand drifts the Mud Whale, a floating island city of clay and magic. In its chambers a small community clings to survival, cut off from its own history by the shadows of the past.

The promised haven of Amonlogia is closer than ever, but the dark history of the Mud Whale still poses a terrible threat to its people. Somehow, learning the truth about the past has freed Ouni's thymia from any constraint, and he is forced to lock himself away to avoid hurting the others. But even with that precaution, his very presence is a danger to his people as Orca mounts an expedition to capture the daímonas and kill everyone else!