Within hours the slaughter was complete and almost the entire strength of three complete Legions lay silent and dead on the tortured sands of Isstvan V.

The once-grey skies of the planet burned orange with the reflected glow of a thousand pyres. The firelight bathed the rippling, glassy sands in a warm radiance, and towering pillars of black smoke from the burning corpses filled the air. Lucius watched the blizzard of ash fall like snow from the skies and stuck out his tongue to taste the greasy, ashen tang of the dead.

Beside him, Lord Commander Eidolon, the skin of his face stretched and waxen over his bones, watched the cremation of the dead with dull, glassy eyes.

'We need to be moving again soon,' said Eidolon. 'We have no time to waste with pointless ritual.'

Privately, Lucius agreed, but he kept his counsel as the thousands of Astartes loyal to Horus filled the broken desert of the Urgall Depression. They gathered before a great reviewing stand, constructed by the dark priests of the Mechanicum with astonishing speed. As the sun began to sink beyond the horizon, the smooth black planes of the stand shone with a blood red glow.

The stand was erected as a series of cylinders of ever decreasing diameter, one standing atop another. The base was perhaps a thousand metres in width, constructed as a great grandstand upon which the Sons of Horus stood, their pre-eminent position as the elite of the Warmaster in no doubt after this great victory. Each warrior bore a flaming brand, and the firelight cast brilliant reflections from their armour.

Atop this pedestal of flame was another platform, occupied by the senior officers of the Legion. Lucius could see the familiar, hulking form of Abaddon together with Horus Aximand. The others he didn't recognise, but his attention was drawn higher before he could linger on their identities.

Above the senior officers of the Sons of Horus stood the primarchs.

Even rendered miniscule by distance, the sheer magnificence of such a gathering of might was breathtaking. Seven beings of monumental power stood on the penultimate tier of the reviewing stand, their armour still stained with the blood of their foes, their cloaks billowing in the winds that swept the Urgall Depression.

He had known Angron and Mortarion since the bloody days of Isstvan III. Their might had been demonstrated to him time and time again during that campaign. His own primarch had been a source of inspiration to Lucius for decades, though Fulgrim stood curiously apart from his brothers on the podium, as though disdainful of them.

But the others… the others had been unknown to him until now, their power and presence filling the plain before the stand with a hushed awe.

Lorgar of the Word Bearers, who had only recently arrived, stood proud and tall with his red cloak wrapped around his granite grey armour like a shroud. Alpharius, resplendent in purple and green held himself erect, as though attempting to match the beings around him in stature. Grim-faced Perturabo stood apart from his brothers, the firelight reflecting red from the burnished plates of his armour and mighty hammer. The lightning-streaked armour of Night Haunter seemed darker even than the black podium, his skull-faced helmet a spot of white amid the shadows that wreathed him.

Finally, the uppermost tier of the reviewing stand was a tall cylinder of crimson that stood a hundred metres above the primarchs. The Warmaster stood on top of it, his clawed gauntlets raised in salute. A furred cloak of some great beast hung from his shoulders, and the light of the pyres reflected from the amber eye upon his breastplate.

The Warmaster was illuminated from below by a hidden light source, bathing him in a red glow that gave him the appearance of the statue of a legendary hero, as he stood looking down on the endless sea of his followers from the towering platform.

As the sun finally dipped below the horizon, a flight of assault craft roared over the Urgall Hills, their wings dipping in salute to the mighty warrior below. Solid waves of cheering crashed against the reviewing stand, howls of adulation torn from tens of thousands of throats.

Lucius found himself swept up in the glory and added his voice to the din, his enhanced senses screaming in pleasure at the sheer, deafening volume of the cries. High, screaming voices from the Emperor's Children echoed weirdly over the plain, ecstatic shrieks of pleasure and debasement like nothing that should ever have been given voice by a mortal throat.

No sooner had the aircraft passed overhead than the massed Astartes began to march around the reviewing stand, their arms snapping out and hammering their breastplates in salute of the Warmaster. At some unseen signal a flame ignited on the northern slopes of the Urgall Depression and a blazing line of phosphor leapt across the ground in a snaking arc that described the outline of an enormous blazing eye upon the hillside.

The adulation soared to new heights as the Eye of Horus seared itself into the sands of Isstvan V, the Warmaster's forces roaring themselves hoarse in his praise. Super-heavy tanks fired in salute of Horus, and the towering immensity of the Dies Irae inclined its massive head in a gesture of respect.

The ashes of the dead fell like confetti over the Warmaster's mighty army. Lucius felt a huge surge of purpose fill his heart and made a vow to never once rest in the service of the power Horus represented. Not even death would contain his might. He gripped the hilt of his sword tightly as loudspeakers placed around the desert erupted with sound, the booming, stentorian voice of the Warmaster sweeping over the Astartes.

'My brave warriors!' began Horus. 'We have achieved much, but there is still more for us to do. With courage, vision and power we have defeated those who sought to prevent us from realising my great dream, but our victory here will count for little if we do not press onwards.'

Horus punched his clawed gauntlet into the air and shouted, 'The road to Terra is open. The time has come for us to take the war to the Emperor in his most impregnable fastness! We will make immediate preparation for the invasion of Terra and an assault on the Imperial Palace. Make no mistake, and it will be ours, my brothers! This will be no easy task, for the Emperor and his deluded followers will fight hard to prevent us from interfering with his plans for godhood. Doubtless much blood has yet to be spilled, theirs and our own, but the prize is the galaxy itself Horus paused as he let the weight of the stakes sink in before bellowing across the fields of Isstvan V, 'Are you with me?'

Lucius joined the cheering as it reached into the fire-lit skies, and cries of ''Hail Horus! Hail Horus!'' resounded long into the darkness.

Within the ruined keep of Isstvan V, shadows cast by the funeral pyres were thrown out on the smooth, basalt flagstones. Dust motes shaken from the ceiling and walls by the rumble of thrusters hung heavily in the air as the Warmaster's army took its leave of the fifth planet. Horus watched as yet another squadron of Stormbirds lifted off in clouds of dust lit by blue fire, satisfied that all was proceeding as he desired.

His brother primarchs were mustering their forces for the invasion of Imperial space, and he was certain that each and every one understood the need for unquestioning obedience to his orders. As Warmaster, the armies of the Imperium had been his to control, from the mightiest fleet of battleships to the lowliest Army soldier, but to see such martial power gathered in one place was truly inspiring.

Not since Ullanor had he witnessed such a gathering of heroes, and his mood soured as he thought once again of the devastated greenskin world and the last time he had seen his father. Time had moved on and revealed much that had been hidden, but still the unease that events were moving too fast for him to control gnawed at the furthest corners of his mind.