At the head of the valley, to the north, waited the Raven Guard’s allies. In red and gold, the Therion Cohort stood beside their tanks and transports, arrayed in swathes of twilight and shadow cast by the immense Titan war machines of the Legio Victorum and the Legio Adamantus.

In front of the massed Legion waited a body of five hundred men. Most were garbed in plated carapace armour of shining black, their hoods drawn back to reveal heads of close-cropped hair, faces tattooed with swirling patterns. The soldiers’ targeter lenses gleamed red in the dusk light, gun-halberds drawn up to the salute. At their front stood the elite guard, armoured in enamelled silver, surrounding a handful of civilian dignitaries in ornate robes and coats trimmed with gold braid and heavy epaulettes.

At a signal from one of the elderly men, the soldiers and leaders as one dropped to a knee and bowed their heads to the giant figure pacing slowly out of the ranks of the Raven Guard. The man approaching the Isstvanian delegation was more than a man: he was a primarch. Lord Corax, commander of the Raven Guard, towered above his superhuman warriors, his armour as dark as the night, chased with filigreed designs of towers and ravens and intricate scrollwork. His head was bare, showing pale flesh and straight black hair that hung to the exposed collar of his ornate breastplate. A flight pack fashioned with black wings stretched from the primarch’s back, metallic feathers whistling shrilly in the breeze as he advanced. Dark eyes regarded the delegation with solemn pride.

With hands sheathed in clawed gauntlets, Corax gestured for the Isstvanians to rise.

‘You kneel as a defeated foe. Now stand as men of the Imperium,’ the primarch declared. His voice carried easily over the wind that tousled his hair across his thin face. ‘We have waged war against each other, but the Imperial Truth has prevailed and you have sworn to accept its teachings. In complying with the Emperor’s wishes you have proven yourselves men of wisdom and civilisation, fitting partners to the many other worlds you now join as part of the Imperium of Man. Not conquered, not subjugated, but free men, who have shown courage and pride in defending their values but who have seen the light of the Imperial Truth and now welcome the benefits it will bring.’

Corax turned to his Legion and his voice increased in volume, echoing to the furthest ends of the valley with little effort.

‘We have fought hard and we have fought bravely, and another world is brought from the darkness of superstition and division into the light of the Emperor’s clarity and unity,’ he told his warriors. ‘It is with honour to the fallen and respect to all who stand here that I can declare the Isstvan system brought to compliance!’

A deafening roar of approval sounded from the vocalisers of eighty thousand armoured warriors, joined by cheers drifting down from hundreds of thousands of Therion throats; a clamour which was drowned out by the celebratory blare of the Titans’ war sirens.

ALMOST FIFTEEN YEARS later, Corax had returned with his brother primarchs to bring the rebel Horus to account, but at the dropsite his former allies had shown their true colours. Turning on the Iron Hands, Salamanders and Corax’s Raven Guard, the traitors had all but destroyed those loyal to the Emperor as they had dropped on the world.

Corax had survived the treacherous ambush, though only just. With the remnants of his Legion, the primarch had attacked and retreated, pursued across the wild hills and mountains of the world by half a dozen Legions. Now the Raven Guard had been forced to stand at the last, driven into the open to face the wrath of their pursuers.

The Raven Guard’s first war at Isstvan had been a great victory. Their latest was a humbling defeat. It was a very different noise that provided the background symphony concluding Corax’s latest campaign in the Isstvan system.

The first missiles from the World Eaters’ Whirlwinds were streaking through the sky towards the Raven Guard. Corax’s legionaries refused to take shelter, proud to stand their ground against this enemy after many days of hit-and-run attacks and desperate retreat. The explosions tore through the squads, slaying dozens. Corax stood amidst it all as if in the eye of a hurricane. His officers looked to him and drew strength from his bold defiance of the World Eaters.

Caught upon the windswept mountainside his Legion remained resolute. Behind the peak stretched great salt plains that had forced them into this last, defiant stand. Ahead of them massed the might of the World Eaters, the rage-driven Legion of Angron, who strode at their head roaring for the blood of his brother primarch. A sea of blue spattered with the red of gore swept up from the valley intent on the destruction of the Raven Guard. Maddened by neural implants and driven into a battle-frenzy by inhuman cocktails of stimulants, the berserk warriors of the World Eaters pounded up the sloping mountainside while their tanks and guns provided covering fire; every warrior bellowed his eagerness to fulfil the blood oaths he had sworn to his primarch.

As explosions rocked the slopes, missiles from the Whirlwinds hammering into legionaries and rock in fountains of fire, Corax glanced up to see more vapour trails crossing the open skies, but something was wrong with their direction.

They came from behind the Raven Guard.

Corax saw broad-winged aircraft plunging down from the scattering of cloud, missile pods rippling with fire. A swathe of detonations cut through the World Eaters, ripping through their advance companies. Incendiary bombs blossomed in the heart of the approaching army, scattering white-hot promethium over the steep slopes. Corax looked on with incredulity as blistering pulses of plasma descended from orbit, cutting great gouges into Angron’s Legion.

The roar of jets became deafening as drop-ships descended on pillars of fire: black drop-ships emblazoned with the sigil of the Raven Guard. The legionaries scattered to give the landing craft space to make planetfall. As soon as their thick hydraulic legs touched the ground, ramps whined down and boarding gateways opened.

At first the Raven Guard were in stunned disbelief. A few shouted warnings, believing the drop-ships to be enemy craft painted to deceive. The comm crackled in Corax’s ear. He did not recognise the voice.

‘Lord Corax!’

‘Receiving your transmission,’ he replied cautiously, gaze fixed on the World Eaters as they recovered from the shock of the surprise attack and made ready to advance again.

‘This is Praefector Valerius of the Imperial Army, serving under Commander Branne, my lord.’ The man’s voice was stretched, thin with tension, the words snapped out like a drowning man snatching breaths. ‘We have a short window of evacuation, board as soon as you are able.’

Corax struggled to comprehend what the man was saying. He fixed on a detail – Commander Branne. The Raven Guard captain had been left in charge of the Legion’s homeworld of Deliverance, and Corax had no answer to why Branne was now here at Isstvan. Adjusting quickly to the development, Corax realised that the Raven Guard who had been left as garrison were here, ready to evacuate the survivors of the massacre.

Corax signalled to Agapito, one of his commanders. ‘Marshal the embarkation. Get everybody onboard and break for orbit.’

The commander nodded and turned, growling orders over the vox-net to organise the Raven Guard’s retreat. With practised speed, the Raven Guard dispersed, the drop-ships launching in clouds of smoke and dust as soon as they were full, heading for the ship or ships that had despatched them. Corax watched them streaking back into the skies as shells and missiles fell once again on the Raven Guard’s position. An explosion just to his left rocked him with its shockwave.