After the discovery of an ancient statuette of a forgotten god, Daring Do start to dream about a mysterious city who lies into the depths of the ocean. But the mysterious statuette hides a more dangerous menace for Equestria, and Daring must race against time before the Sleeping One will awaken from his millennial sleep, and bring Doom to the entire world and beyond.

In this new adventure, our favourite pegasus must investigate the ancient cult of the Old Ones that existed before time, and descent into the depths of madness without losing her mental sanity