He had no concern about being spotted. A mere human eye would be unable to pick him out at such a distance, and the rocky terrain and gale force winds would make the crude sensors of the sentinels almost completely ineffective.
'Shall we gun the fools down?' asked Burias. 'The havocs of the VI Coterie have lascannons trained on them.'
'No, let the dogs down there take them,' said Marduk, indicating with a nod towards the figures waiting in ambush.
The three sentinels continued along the ravine, completely unaware of the cultists waiting in the rocks. A screaming rocket streamed through the air, slamming into the exposed cabin of the rearmost walker, which was annihilated in the billowing explosion.
The cult warriors wore pale cloaks as camouflage against the densely packed rock salt that was as hard as any stone, and they billowed out behind the men as they peppered the sentinels with las-fire.
The Imperial walkers began to edge backwards and returned fire, strafing the rocks with autocannons. Several of the cultists fell back as bullets ripped through their cloaks, but they had chosen a good place from which to launch their ambush and the rocks took the brunt of the fire.
One cloaked figure sprinted across the lip of the ravine, bullets spraying at his heels, and threw himself from the high rocks. He landed sprawled atop the roof panel of a sentinel and rose to one knee, a long blade appearing in his hand.
The sentinel crewman leant from the cabin, an autopistol raised, and fired off a quick burst across the rooftop of his cabin. The cultist grabbed the man's arm, pulling him further out of the cabin, and plunged his knife down into the man's neck.
The autocannon on the last sentinel went quiet as a lucky shot slammed into its pilot's head.
'Not bad,' grunted Marduk, as he began the descent towards the victorious cultists.
Karalos looked up sharply as he heard the shout. Brushing his long, unkempt hair back behind his ears with his blood-splattered hand, he sheathed his knife and stood atop the motionless Imperial sentinel. The mutilated, bloody corpse of the Imperial soldier was forgotten as he shielded his eyes to see what the commotion was.
His jaw dropped as he saw the two colossal, red-armoured warriors walking through the ravine towards his band of the faithful.
'Get everyone together,' he ordered. 'The Angels of the Word have come, as the Speaker foretold.'
The cultists' base of operations was high in the mountains, hidden from view from the sky by pale tarpaulins that draped over the low structures. Every member of the cult within Shinar had spent some time at the Camp of the Word, the old Speaker had told Marduk.
The Speaker was a withered man, the flesh all but wasted from his almost skeletal frame. He was blind, his vision long lost to the biting salt of Tanakreg. To Marduk he had looked pathetic.
'Bring me a hundred of your strongest warriors,' he had ordered the old man, 'and send the rest of your cultists out into the passes. The enemy will be soon be upon us.'
He had grown bored as the old man had babbled on, and had eventually put a bullet through his head. The one hundred men on their knees before him had not made a move as the shot had rung out, and Marduk had seen that Karalos had smiled as the old man was slain. Marduk liked the man: he had the soul of a true warrior of Chaos, even if he was just a wretched mortal.
'You men are blessed indeed.' Marduk said, 'for you have been chosen to receive a great gift, a boon of the great majesty of the warp. It is the Calling, and you are to be the hosts.'
Marduk began to chant, his voice effortlessly mouthing the difficult, unearthly language of the daemon. He felt the creature Borhg'ash within his chainsword stir at his words.
The kneeling men were surrounding by dozens of burning blood-candles, the light of their flames the only thing holding the darkness of the room at bay. They flickered as Marduk continued his incantation, the flames straining in towards the First Acolyte.
Whispers could be heard, flittering around the dark edges of the room, and Marduk welcomed them, for they spoke of the arrival of the Kathartes. The flickering of the candles increased, and a howling sound began to circle the gathered group as Marduk's voice rose.
The blood of the Speaker, pooling out on the floor of the room, began to bubble, and Marduk knelt and placed both hands in the rapidly heating liquid.
Marduk continued to speak the words of the Calling and stepped towards the kneeling figure of Karalos, placing a bloody hand on either side of the man's head. He held onto his head firmly, feeling the skull compress beneath his hands, and continued his complex incantation.