Brak vs the Mark of the Demons

He came from the north to the dreaded wastes of Lugol, land of loathsome beasts and demons. And although he was tall and strong, brave and resourceful, even he was afraid of the strange singing that came from the desert; of the beautiful, mysterious twins; of the fierce, ruby-eyed warriors of Quran; and of the dreadful mark of the Demons.
Yes, even he, Brak the Barbarian, was afraid . . . for against such supernatural forces, his mighty sword was useless.
"Crisp, vivid, exciting—the ghost of Robert E. Howard's Conan moves through the pages of John Jakes."
— Lin Carter