Gaia, Mother Earth, is dying. Disturbed by humanity's endless hunger, she is losing the battle against the Wyrm, a cosmic force of decay and destruction. Manifested in the company Endron, the servants of the Wyrm are ready to feast on nature's own corpse.

A former protector of Gaia, born under the full moon, and proud werewolf warrior of the Fianna tribe. However, after losing control of his destructive rage, Cahal chose a life of exile. Years later, while searching for his missing daughter, Cahal discovers that his old pack is in danger and he must help.