Above them gleamed the phosphorescent roof; a hundred feet below them stretched the smooth floor of the cavern. On the far side this floor was cut by a deep, narrow stream brimming its rocky channel. Rushing out of impenetrable gloom, it swirled across the cavern and was lost again in darkness. The visible surface reflected the radiance above; the dark seething waters glinted as if flecked with living jewels, frosty blue, lurid red, shimmering green, and ever-changing iridescence.
Conan and his companion stood upon one of the gallery-like ledges that banded the curve of the lofty wall, and from this ledge a natural bridge of stone soared in a breath-taking arch over the vast gulf of the cavern to join a much smaller ledge on the opposite side, across the river. Ten feet below it another, broader arch spanned the cave. At either end a carved stair joined the extremities of these flying arches.
Conan's gaze, following the curve of the arch that swept away from the ledge on which they stood, caught a glint of light that was not the lurid phosphorus of the cavern. On that small ledge opposite them there was an opening in the cave wall through which stars were glinting.
But his full attention was drawn to the scene beneath them. The priests had reached their destination. There in a sweeping angle of the cavern wall stood a stone altar, but there was no idol upon it. Whether there was one behind it, Conan cound not ascertain, because some trick of the light, or the sweep of the wall, left the space behind the altar in total darkness.
The priests had stuck their torches into holes in the stone floor, forming a semicircle of fire in front of the altar at a distance of several yards. Then the priests themselves formed a semicircle inside the crescent of torches, and Gorulga, after lifting his arms aloft in invocation, bent to the altar and laid hands on it. It lifted and tilted backward on its hinder edge, like the lid of a chest, revealing a small crypt.
Extending a long arm into the recess, Gorulga brought up a small brass chest. Lowering the altar back into place, he set the chest on it, and threw back the lid. To the eager watchers on the high gallery it seemed as if the action had released a blaze of living fire which throbbed and quivered about the opened chest. Conan's heart leaped and his hand caught at his hilt. The Teeth of Gwahlur at last! The treasure that would make its possessor the richest man in the world! His breath came fast between his clenched teeth.
Then he was suddenly aware that a new element had entered into the light of the torches and of the phosphorescent roof, rendering both void. Darkness stole around the altar, except for that glowing spot of evil radiance cast by the Teeth of Gwahlur, and that grew and grew. The blacks froze into basaltic statues, their shadows streaming grotesquely and gigantically out behind them.
The altar was laved in the glow now, and the astounded features of Gorulga stood out in sharp relief. Then the mysterious space behind the altar swam into the widening illumination. And slowly with the crawling light, figures became visible, like shapes growing out of the night and silence.
At first they seemed like gray stone statues, those motionless shapes, hairy, man-like, yet hideously human; but their eyes were alive, cold sparks of gray icy fire. And as the weird glow lit their bestial countenances, Gorulga screamed and fell backward, throwing up his long arms in a gesture of frenzied horror.
But a longer arm shot across the altar and a misshapen hand locked on his throat. Screaming and fighting, the high priest was dragged back across the altar; a hammer-like fist smashed down, and Gorulga's cries were stilled. Limp and broken he sagged cross the altar; his brains oozing from his crushed skull. And then the servants of Bit-Yakin surged like a bursting flood from Hell on the black priests who stood like horror-blasted images.
Then there was slaughter, grim and appalling.
Conan saw black bodies tossed like chaff in the inhuman hands of the slayers, against whose horrible strength and agility the daggers and swords of the priests were ineffective. He saw men lifted bodily and their heads cracked open against the stone altar. He saw a flaming torch, grasped in a monstrous hand, thrust inexorably down the gullet of an agonized wretch who writhed in vain against the arms that pinioned him. He saw a man torn in two pieces, as one might tear a chicken, and the bloody fragments hurled clear across the cavern. The massacre was as short and devastating as the rush of a hurricane. In a burst of red abysmal ferocity it was over, except for one wretch who fled screaming back the way the priests had come, pursued by a swarm of blood-dabbled shapes of horror which reached out their red-smeared hands for him. Fugitive and pursuers vanished down the black tunnel, and the screams of the human came back dwindling and confused by the distance.
Muriela was on her knees clutching Conan's legs; her face pressed against his knee and her eyes tightly shut. She was a quaking, quivering mold of abject terror. But Conan was galvanized. A quick glance across at the aperture where the stars shone, a glance down at the chest that still blazed open on the blood-smeared altar, and he saw and seized the desperate gamble.
"I'm going after that chest!" he grated. "Stay here!"
"Oh, Mitra, no!" In an agony of fright she fell to the floor and caught at his sandals. "Don't! Don't! Don't leave me!"
"Lie still and keep your mouth shut!" he snapped, disengaging himself from her frantic clasp.
He disregarded the tortuous stair. He dropped from ledge to ledge with reckless haste. There was no sign of the monsters as his feet hit the floor. A few of the torches still flared in their sockets, the phosphorescent glow throbbed and quivered, and the river flowed with an almost articulate muttering, scintillant with undreamed radiances. The glow that had heralded the appearance of the servants had vanished with them. Only the light of the jewels in the brass chest shimmered and quivered.
He snatched the chest, noting its contents in one lustful glance — strange, curiously shapen stones that burned with an icy, non-terrestrial fire. He slammed the lid, thrust the chest under his arm, and ran back up the steps. He had no desire to encounter the hellish servants of Bit-Yakin. His glimpse of them in action had dispelled any ilusion concerning their fighting ability. Why they had waited so long before striking at the invaders he was unable to say. What human could guess the motives or thoughts of these monstrosities? That they were possessed of craft and intelligence equal to humanity had been demonstrated. And there on the cavern floor lay crimson proof of their bestial ferocity.
The Corinthian girl still cowered on the gallery where he had left her. He caught her wrist and yanked her to her feet, grunting: "I guess it's time to go!"
Too bemused with terror to be fully aware of what was going on, the girl suffered herself to be led across the dizzy span. It was not until they were poised over the rushing water that she looked down, voiced a startled yelp and would have fallen but for Conan's massive arm about her. Growling an objurgation in her ear, he snatched her up under his free arm and swept her, in a flutter of limply waving arms and legs, across the arch and into the aperture that opened at the other end. Without bothering to set her on her feet, he hurried through the short tunnel into which this aperture opened. An instant later they emerged upon a narrow ledge on the outer side of the cliffs that circled the valley. Less than a hundred feet below them the jungle waved in the starlight.