Hadrathus shook his head. 'If there were, we of Asura would know of him. Men say our cult is a survival of the ancient Stygian serpent-worship. That is a lie. Our ancestors came from Vendhya, beyond the Sea of Vilayet and the blue Himelian mountains. We are sons of the East, not the South, and we have knowledge of all the wizards of the East, who are greater than the wizards of the West. And not one of them but would be a straw in the wind before the black might of Xaltotun.' 'But he was conquered once,' persisted Conan. 'Aye; a cosmic source was turned against him. But now that source is again in his hands, and he will see that it is not stolen again.' 'And what is this damnable source?' demanded Conan irritably. 'It is called the Heart of Ahriman. When Acheron was overthrown, the primitive priest who had stolen it and turned it against Xaltotun hid it in a haunted cavern and built a small temple over the cavern. Thrice thereafter the temple was rebuilt, each time greater and more elaborately than before, but always on the site of the original shrine, though men forgot the reason therefor. Memory of the hidden symbol faded from the minds of common men, and was preserved only in priestly books and esoteric volumes. Whence it came no one knows. Some say it is the veritable heart of a god, others that it is a star that fell from the skies long ago. Until it was stolen, none had looked upon it for three thousand years. 'When the magic of the Mitran priests failed against the magic of Xaltotun's acolyte, Altaro, they remembered the ancient legend of the heart, and the high priest and an acolyte went down into the dark and terrible crypt below the temple into which no priest had descended for three thousand years. In the ancient iron-bound volumes which speak of the Heart in their cryptic symbolism, it is also told of a creature of darkness left by the ancient priest to guard it. 'Far down in a square chamber with arched doorways leading off into immeasurable blackness, the priest and his acolytes found a black stone altar that glowed dimly with inexplicable radiance. 'On that altar lay a curious gold vessel like a double-valved sea-shell which clung to the stone like a barnacle. But it gaped open and empty. The Heart of Ahriman was gone. While they stared in horror, the keeper of the crypt, the creature of darkness, came upon them and mangled the high priest so that he died. But the acolyte fought off the being--a mindless, soulless waif of the pits brought long ago to guard the Heart--and escaped up the long black narrow stairs carrying the dying priest, who before he died, gasped out the news to his followers, bade them submit to a power they could not overcome, and commanded secrecy. But the word has been whispered about among the priests, and we of Asura learned of it.' 'And Xaltotun draws his power from this symbol?' asked Conan, still skeptical.