A new threat -- something ancient and evil -- faces the world of Erdas and four young heroes and their spirit animals are determined to stop it as they embark on a desperate journey that takes them deep underground and to the far corners of the world.

Guided reading level V.|||860L Lexile|||juvenile

Victoria Schwab.

Sequel to: Immortal guardians.

"Read the book, unlock the game" -- Cover.

Accelerated Reader AR MG 5.8 7 179009.