Volume XVII of The Chronicles of Counter Earth.  The Kur came to Port Kar… Two of the terrible space beasts came to make Tarl Cabot an offer. They, a death-squad, sought the renegade Kur commander, the great Half-Ear, whom Tarl had once battled in the Far North. But Tarl refused their offer, for Half-Ear was more valuable to the Priest-Kings alive than to the Kur dead. And now he knew it was imperative for him to save that monster from the doom that would fast overtake him. This meant venturing the forbidden Barrens of Gor – a vast land of plains and prairies whose cruel Masters were tribes of savage red riders and where civilized men were always prey and their women mere trophies of the hunt.