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Taita signalled the two vehicles that followed him to halt。 They stopped in the purple shade thrown across the sands by a tall slip…faced dune shaped like the elegant curve of a gigantic seashell。
The horses were already showing signs of distress。 They hung their heads and their chests heaved as they breathed。 The sweat had dried in salt white rime on their dust…dulled hides。
Carefully they measured out a water ration from the waterskins into the leather buckets and the horses drank eagerly。 Taita treated Mintaka 's feet and was relieved to find no evidence that the injuries were mortifying。 When he had retied the bandages he led Bay out of earshot of the others。
'We are being overlooked；' he said flatly。 There is a baleful influence slowly enveloping us。'
'I have felt it also；' Bay agreed； 'and I have begun to resist it。 But it is powerful。'
'We can best frustrate it if we bine our powers against it。'
'We must be careful of the others。 They are more vulnerable。'
'I will warn them to be on their guard。'
Taita walked back to where the others were just finishing the watering。 'Be ready to go on；' he told Nefer。 'Bay and I are going to scout the ground ahead。 We will return in a short while。'
The two adepts went forward on foot and disappeared around the curved sand wall of the slip…face。 Out of sight of the chariots they halted。 'Do you know who Trok has with him who can work such a potent spell？'
'He has priests and sorcerers with all his regiments； but the most powerful of them is Ishtar the Mede。'
'I know of him。' Taita nodded。 'He works in fire and blood。 We must try to turn his influence back on him。'
Bay started a small fire of dried horse dung； and when it was burning steadily they pricked the end of their thumbs and squeezed out a few red drops into the flames。 With the whiff of burnt blood in the air they faced the enemy； for they could feel that the influence was in the western segment； from the direction that they had e。 They exerted their bined powers and after a while they felt it begin to diminish； and disperse like the smoke of the dying fire。
When they had pleted the ritual； and were smothering the fire with sand； Bay said softly； 'It is still there。'
'Yes；' Taita said。 'We have weakened it； but it is still dangerous； especially to those who have not learned how to resist it。'
'The youngest will be more susceptible；' Bay suggested。 'The two boys； Pharaoh and Meren； and the girl。'
They went back to where the chariots waited。 Before they mounted again Taita spoke to the others。 He knew that they would be frightened if he mentioned the true reason for his concern； so he said； 'We are entering the most inhospitable and dangerous area of the dune…lands。 I know you are all tired and thirsty； drained by the rigours of the journey； but it could be fatal for any of you to bee careless。 Watch the horses and the ground ahead。 Do not allow yourselves to be distracted by any strange sound or by an unusual sight； a bird or an animal。' He paused and looked directly at Nefer。 'That applies to you particularly； Your Majesty。 Be on your guard at all times。'
Nefer nodded and for once did not argue。 The rest of them also looked grave； realizing that Taita had some reason of his own to give them this warning。
As they went forward again； following the valleys between the high dunes the heat seemed to increase with every turn of the chariot wheels。 The loose sand walls that rose on either hand took on a motley of vivid colours； lemon yellow and gold； plum； purple and heron blue； fox…red and tawny lion…brown。 In places the dunes were streaked with frosty talc； or etched with patterns of black sand like the soot of an oil lamp。
Overhead the sky turned brazen and ferocious。 The quality of light changed： it became yellow and ethereal。 Distances were rendered confusing and distorted。 Nefer slitted his eyes against the shimmering glare of the brassy sky。 It seemed close enough to touch with the end of his whip。 At the same time the shape of Taita's vehicle only fifty cubits ahead seemed to recede to a blurred and distant horizon。
The heat scorched any exposed skin on face or body。 Nefer felt a formless dread take hold of him。 There was no reason for it； but he could not shake it off。
When Mintaka shuddered against him and gripped his whip arm he knew that she had sensed it too。 Great evil hung in the air。 He wanted to call out to Taita； to ask him for guidance and reassurance； but his throat was closed by dust and heat。 No sound issued from it。
Suddenly at his side he felt Mintaka stiffen and her fingers dug painfully into the biceps of his whip arm。 He looked down at her face and saw that she was terrified。 With her free hand she pointed frantically to the crest of the dune that seemed to hang suspended above them。
Something colossal and dark detached itself from the heights and began to tumble down towards them。 He had never seen anything like it。 It had the same weighty amorphous shape as a monstrous waterskin； but was so large that it covered the entire side of the dune； large enough to engulf and squash not only the three chariots below it but an entire regiment。 As it rolled down the almost sheer slope it gathered speed； undulating； wobbling and bouncing silently； ing down on them so swiftly that it blotted out the yellow desert sky。 In the heat it exuded a sudden cold that squeezed their breath from their lungs as if they had plunged into an icy pool in a high mountain stream。
The horses had seen it also： they plunged wildly and swung off the sandy track and bolted across the valley bottom； trying to outrun the terrifying apparition。 There was a field of ragged black lava rocks directly ahead of them and they were racing straight into it。 Nefer realized the danger and tried to turn their heads but they were out of control。 As he wrestled with the reins Mintaka was screaming beside him。
Certain that they were about to be overwhelmed by the dark monstrosity； Nefer glanced over his shoulder。 He expected it to be looming over them； for he could feel the cold emanation on the back of his neck； but there was nothing。 The side of the dune was bare； smooth and silent。 The yellow sky above was empty and bright。 The other two chariots were halted under the slope； the horses calm and under control。 Taita and the others were staring at them； astonished。
'Whoa！' Nefer yelled at the runaway team； and threw his full weight on the reins； but the horses never checked。 At full gallop they flew into the field of lava rock with the chariot bounding and swerving behind them。 'Whoa！' he screamed again。 'Stop； curse you； stop！'
The horses were mad with terror； far beyond restraint。 They arched their necks to fight the reins； striding out at full stretch； grunting with every stride。
'Hold hard； Mintaka！' Nefer shouted； and threw one arm around her shoulders to protect her。 'We are going to strike！'
The black rocks were w