Sixteen years after the bloody Shadow War, the Main Kingdom survives behind walls of steel and lies. Krell, a restless prince, discovers that the shadow creatures have escaped their magical prison and are advancing to snuff out every trace of light in the lands. Together with Reyna, the last elf of the Zumba tribe, he must flee the palace's comfort and cross lethal forests, haunted rivers, and mountains swarming with trotters to forge an impossible alliance among kingdoms. But how could the prince possibly unite the kingdoms if his father was the reason they grew apart in the first place?