 However, this portal also allows an invasion by two rival armies -- Lucifer and the forces of Hell, and the Horde, commanded by Mordru and the Questing Queen.Both armies seek to conquer Avalon, a land of the dead that possesses many secrets.In "The Books of Magic", "Avalon" is one of the names given to the realm of Faerie, indicating that the island may exist within it or that the two may be synonymous.