Gandalf then tells the Balrog to "go back to the shadow." While it can be a metaphor for obscurity, Melkor and his minions abhor the light and the Sun, so Utumno was always covered by shadow.

Witness the epic battle between Gandalf the Grey and the monster from below, the Balrog. Coming in at 1,201 pieces, this new Book Nook comes in at 17.5" long when fully extended or can fit snugly ...