Four children separated by vast distances all undergo the same ritual, watched by cloaked strangers. Four flashes of light erupt, and from them emerge the unmistakable shapes of incredible beasts - a wolf, a leopard, a panda, a falcon. Suddenly the paths of these children - and the world - have been changed forever. Enter the world of Erdas, where every child who comes of age must discover if they have a spirit animal, a rare bond between human and beast that bestows great powers to both. A dark force has risen from distant and long-forgotten lands, and has begun an onslaught that will ravage the world. Now the fate of Erdas has fallen on the shoulders of four young strangers... and on you. 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.

When Wilfong the wolf fails to blow down the house of the Pygg brothers, he stays outside their door all winter learning their games and listening to their jokes and stories, but although he claims to be reformed, the pigs are reluctant to offer friendship.