A dark threat faces the world of Erdas in this riveting new saga from the bestselling series. In the world of Erdas, every child must discover if they will summon a spirit animal, a rare and incredible gift. Conor, Abeke, Meilin, and Rollan were rare even among those few. They summoned legendary animals—brave guardians who were reborn to protect their world. Now more of these legends are appearing across Erdas, bonded to special children. But a dark force has emerged. Older than memory, it has slept for centuries beneath the surface of the world. With the power to tear away spirit animals, it begins a rampage that will be felt in every corner of Erdas. If the young heroes can't stop it, the darkness will first consume the spirit animals . . . and then the world.