As a dark force engulfs the land, the fate of Erdas has fallen on the shoulders of four young strangers who each have forged a rare bond with their spirit beasts -- a bond that gives great powers to all of them.

Everyone in Vallen knows that ice wolves and scorch dragons are sworn enemies who live deeply separate lives. So when twelve-year-old orphan Anders takes one elemental form and his twin sister, Rayna, takes another, he wonders whether they are even related. Still, whether or not they're family, Rayna is Anders's only true friend.