Many died who drank of it; and in those who lived, the drinking wrought change, subtle, gradual and grisly. In adapting themselves to the changing conditions, they had sunk far below their original level. But the lethal waters altered them even more horribly, from generation to more bestial generation. They who had been winged gods became pinioned demons, with all that remained of their ancestors' vast knowledge distorted and perverted and twisted into ghastly paths. As they had risen higher than mankind might dream, so they sank lower than man's maddest nightmares reach. They died fast, by cannibalism, and horrible feuds fought out in the murk of the midnight jungle. And at last among the lichen-grown ruins of their city only a single shape lurked, a stunted abhorrent perversion of nature. Then for the first time humans appeared: dark-skinned, hawk-faced men in copper and leather harness, bearing bows--the warriors of pre-historic Stygia. There were only fifty of them, and they were haggard and gaunt with starvation and prolonged effort, stained and scratched with jungle-wandering, with blood-crusted bandages that told of fierce fighting. In their minds was a tale of warfare and defeat, and flight before a stronger tribe which drove them ever southward, until they lost themselves in the green ocean of jungle and river. Exhausted they lay down among the ruins where red blossoms that bloom but once in a century waved in the full moon, and sleep fell upon them. And as they slept, a hideous shape crept red-eyed from the shadows and performed weird and awful rites about and above each sleeper. The moon hung in the shadowy sky, painting the jungle red and black; above the sleepers glimmered the crimson blossoms, like splashes of blood. Then the moon went down and the eyes of the necromancer were red jewels set in the ebony of night. When dawn spread its white veil over the river, there were no men to be seen: only a hairy winged horror that squatted in the center of a ring of fifty great spotted hyenas that pointed quivering muzzles to the ghastly sky and howled like souls in hell. Then scene followed scene so swiftly that each tripped over the heels of its predecessor. There was a confusion of movement, a writhing and melting of lights and shadows, against a background of black jungle, green stone ruins and murky river. Black men came up the river in long boats with skulls grinning on the prows, or stole stooping through the trees, spear in hand. They fled screaming through the dark from red eyes and slavering fangs. Howls of dying men shook the shadows; stealthy feet padded through the gloom, vampire eyes blazed redly. There were grisly feasts beneath the moon, across whose red disk a bat-like shadow incessantly swept.