"During the eons the Ancient Ones dwelt within their protecting wall of haze the outer world changed. Cold came to the north and south; the Land of Sun and the Land of Sea arose to bear the foot of true man. On their mirrors of seeing the Ancient Ones watched man-life spread across the world. They had the power of prolonging life, but still the race was dying. From without must come new blood. So certain men were summoned from the Land of the Sun. Then the race flourished for a space. "The Ancient Ones decided to leave Tav for the outer world. But the sea swallowed the Land of Sun. Again, in the time of the Land of Sea, the stock within Tav was replenished and the Ancient Ones prepared for exodus; again the sea cheated them. "Those men left in the outer world reverted to savagery. Since the Ancient Ones would not mingle their blood with that of almost beasts, they built the haze wall stronger and remained. But a handful of them were attracted by the forbidden, and secretly they summoned the beast men. Of that monstrous mating came the Black Ones. They live but for the evil they may do, and the power which they acquired is debased and used to forward cruelty. "At first their sin was not discovered. When it was, the others would have slain the offspring but for the law which forbids them to kill. They must use their power for good or it departs from them. So they drove the Black Ones to the southern end of Tav and gave them the Caves of Darkness. Never were the Black Ones to come north of the River of Gold--nor were the Ancient Ones to go south of it. "For perhaps two thousand years the Black Ones kept the law. But they worked, building powers of destruction. While matters rested thus, the Ancient Ones searched the world, seeking men by whom they could renew the race. Once there came men from an island far to the north. Six lived to penetrate the mists and take wives among the Daughters. Again, they called the yellow-haired men of another breed, great sea rovers. "But the Black Ones called too. As the Ancient Ones searched for the best, the Black Ones brought in great workers of evil. And, at last, they succeeded in shutting off the channels of sending thought so that the Ancient Ones could call no more. "Then did the Black Ones cross the River of Gold and enter the land of the Ancient Ones. Thran, Dweller in the Light and Lord of the Caverns, summoned the Folk to him.