"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.
"'There will come one to aid you,' he told us. 'Try the summoning again after the Black Ones have seemed to win. Thrala, Daughter of the Light, will not enter into the Room of Pleasant Death with the rest of the women, but will give herself into the hands of the Black Ones, that they may think themselves truly victorious. You of the Folk withdraw into the Place of Reptiles until the Black Ones are gone. Nor will all the Ancient Ones perish—more will be saved, but the manner of their preservation I dare not tell. When the sun-haired youth comes from the outer world, send him into the Caves of Darkness to rescue Thrala and put an end to evil.'
"And then the Lady Thrala arose and said softly, 'As the Lord Thran has said, so let it be. I shall deliver myself into the hands of the Black Ones that their doom may come upon them.'
"Lord Thran smiled upon her as he said: 'So will happiness be your portion. After the Great Mists, does not light come again?'
"The women of the Ancient Ones then took their leave and passed into the place of Pleasant Death while the men made ready for battle with the Black Ones. For three days they fought, but a new weapon of the Black Ones won the day, and the chief of the Black Ones set up this throne of jet as proof of his power. Since, however, the Black Ones were not happy in the Caverns, longing for the darkness of their caves, they soon withdrew and we, the Folk, came forth again.