When an ancient Harmonic device called Sphere Five awakens beneath Pluto, three unlikely heroes are pulled into a war that spans universes. Luke Smith, a multiverse-sensitive pilot; Kat Arendelle, a Moon-Stage hybrid with forbidden powers; and Adobo, a dimensional-tracking alien hybrid, discover that Sphere Five is the key to stabilizing - or destroying - the multiverse.
Its activation alerts the imprisoned Vor'tak Dominion and a cosmic predator known as The Arc-Layer, a being that feeds on collapsing realities. As alternate Earths fall and the Twelve Spheres begin to stir, Luke, Kat, and Adobo must retrieve the lost Keys of the Calens, unite warring factions, and confront enemies that exist outside time.
The fate of every universe rests on one choice: unlock Sphere Five and save reality - or unleash the final collapse