Book 5: The Final Battle. In the final book of the Birthrights series, evil seeks to manufacture an eruption of the supervolcano lying beneath Yellowstone National Park. Forcing earthquake after earthquake, with each progressively stronger than the one before, the plates sealing the magma within the chamber steadily weaken. Only The Ten can stop it. Two will be lost. Two will be found. Range Wars is set against a high plains backdrop, where a battle a quarter-millennium in the making begins at America's first national monument, Devil's Tower, and ends at America's first national park, Yellowstone. Chosens fight alongside priestesses as The Ten marshal their forces for a Western-style Armageddon.