The end has come ... not only for the Outcasts but for all of planet Dulunae.

An intrepid group of young survivors continue to forge their way to a safe HayVen that may or may not exist. Meanwhile, dormant volcanoes awaken and explode, pouring fire streams across the planet's surface. From the inferno arise the ultimate agents of death and destruction, paving the way for their leader. Animals of all kinds lurk in the darkness. Grim alliances form. Shadow Beasts emerge with dubious motives. And the Outcasts trusted scout Jax goes missing. The final battle will reveal who controls the destiny of Dulunae.