Xaltotun screamed inhumanly and rushed around the altar, dagger lifted; but from somewhere—out of the sky, perhaps, or the great jewel that blazed in the hand of Hadrathus—shot a jetting beam of blinding blue light. Full against the breast of Xaltotun it flashed, and the hills re-echoed the concussion. The wizard of Acheron went down as though struck by a thunderbolt, and before he touched the ground he was fearfully altered. Beside the altar-stone lay no fresh-slain corpse, but a shriveled mummy, a brown, dry, unrecognizable carcass sprawling among moldering swathings.
Somberly old Zelata looked down.
'He was not a living man,' she said. 'The Heart lent him a false aspect of life, that deceived even himself. I never saw him as other than a mummy.'
Hadrathus bent to unbind the swooning girl on the altar, when from among the trees appeared a strange apparition—Xaltotun's chariot drawn by the weird horses. Silently they advanced to the altar and halted, with the chariot wheel almost touching the brown withered thing on the grass. Hadrathus lifted the body of the wizard and placed it in the chariot. And without hesitation the uncanny steeds turned and moved off southward, down the hill. And Hadrathus and Zelata and the gray wolf watched them go—down the long road to Acheron which is beyond the ken of men.
Down in the valley Amalric had stiffened in his saddle when he saw that wild horseman curvetting and caracoling on the slopes while he brandished that blood-stained serpent-banner. Then some instinct jerked his head about, toward the hill known as the King's Altar. And his lips parted. Every man in the valley saw it—an arching shaft of dazzling light that towered up from the summit of the hill, showering golden fire. High above the hosts it burst in a blinding blaze that momentarily paled the sun.
'That's not Xaltotun's signal!' roared the baron.
'No!' shouted Tarascus. 'It's a signal to the Aquilonians! Look!'
Above them the immobile ranks were moving at last, and a deep-throated roar thundered across the vale.
'Xaltotun has failed us!' bellowed Amalric furiously. 'Valerius has failed us! We have been led into a trap! Mitra's curse on Xaltotun who led us here! Sound the retreat!'