A horrific wet sucking noise engulfed the prima donna and whatever force had previously held her aloft released her. The thing Coraline Aseneca had become landed with supple grace in the centre of the stage.

Julius had never seen anything so simultaneously beautiful and repellent, a naked female creature that evoked both a potent loathing, and a perverse sensuality that gnawed at the pit of his stomach. Hair like needle horns swept back from her oval face, with its green, saucer-like eyes, fanged mouth and luscious lips. Her body was sculpted perfection, lithe and sensuous, but with only a single breast, and her skin was loathsomely tattooed and pierced. Each of her arms terminated in a long crab-like claw of glistening red chitin and moist flesh. Despite the lethal claws, the creature was disturbingly seductive, and Julius felt moved in a way he had not been since he had been elevated to the ranks of the Astartes.

She moved with languid, cat-like grace, her every movement redolent with sexuality and the promise of dark pleasures and excesses unknown to the minds of mortal men. Julius ached to taste them. The she-creature turned her ancient eyes upon the choristers behind her and threw her head back to emit a siren song of such longing and heartbreaking beauty that Julius wanted to climb from the box to join her.

Even before the note of summoning had dissipated, it was taken up by the frenzied orchestra, and grew louder and louder. Julius saw the members of the chorus spasm and twist as Coraline Aseneca had, the same bone-cracking harmonies transforming five of them into more of the hauntingly alluring creatures. The remaining choristers fell to the stage as dried husks of flesh, drained of their life, as though merely fuel to power the transformation of the cavorting creatures that leapt from the stage in a flurry of slicing claws and bestial shrieks.

The six creatures moved with sinewy, supple grace, the caress of their razor sharp claws opening arteries and severing limbs with every lissom movement.

Bequa Kynska was the first to die, a monstrous claw impaling her from behind and ripping from her chest in a fountain of blood. Even as she died, she smiled in delight at the wondrous things she had done. The rest of the orchestra was torn to pieces as the beautiful monsters ripped through them with a speed and sensual malice that Julius could barely imagine.

At last, the music of the Maraviglia fell silent as the musicians were slaughtered in the caress of razor claws, their lives torn from their quivering flesh. Julius cried out in the sudden void, the absence of the music like a physical pain in his bones. Though the music had fallen silent, La Venice was still a deafening arena. The killing and copulation continued unabated, though the shrieks of agony and ecstasy turned to wails of anguish as the music's demise was mourned in renewed bouts of bloody madness.

Julius heard Marius give a howling cry of loss and turned to see his battle-brother leap from the Phoenician's Nest to the stage. Fulgrim watched him go, his body quivering with emotion and pleasure, and Julius pushed himself unsteadily to his feet. He watched as Marius dropped into the bloody ruin of the orchestra pit and lifted one of Bequa Kynska's bizarre instruments.

Marius hefted the long, tubular device and hooked it into the crook of his arm like a boltgun, running his hands along the length of the shaft until it produced a monstrous vibration like the roar of a chainsword. Even as Julius watched Marius's futile attempts to recreate the music, more of the Emperor's Children rushed to join him, each picking up one of the orchestral instruments and attempting to conjure the magic of the music once again.

Julius felt the breath heave in his lungs and gripped the edge of the balcony for fear that his legs would not support him.

'I… what…?' was all he could manage as Fulgrim moved to stand next to him.

'Wondrous was it not?' asked Fulgrim, his skin glowing with renewed vigour and his eyes alight with fresh purpose. 'Mistress Kynska was a fiery comet. Everyone stopped to look at her and now she is gone. We will never see anything like her again, and none of us will be able to forget her.'

Julius tried to reply, but a vast explosion of noise erupted from behind him and he turned to see a portion of the stage wreathed in smoke and collapsing rubble. Marius stood in the centre of the orchestra pit, electrical fire dancing across his flesh as he strummed his hands across the screaming instrument. A howling, pyrotechnic blast of sonic energy shot from it and ripped one of the balconies from the wall in a devastating explosion. Chunks of marble and plaster flew through the air and the sound of the instrument drew howls of pleasure from Marius's fellow Astartes.

Within moments, each had mastered his device and a renewed crescendo of howling, shrieking blasts of energy began ripping the theatre apart. The monstrously beguiling she-monsters gathered around Marius, adding their own unnatural shrieks of pleasure to the delirious music he was making.

Marius turned his instrument into the crowd and unleashed a thrumming bass note that built to an explosive climax. Clashing chords like howls of ecstasy tore through a dozen mortals with an ear-splitting concussion, and each of Marius's victims thrashed helplessly as their bones snapped and heads exploded beneath the barrage of noise.

'My Emperor's Children,' said Fulgrim, 'what sweet music they make.'

Explosions of flesh and stone bloomed throughout La Fenice as Marius and the rest of the Astartes filled it with the music of the apocalypse.

Captain Balhaan stood immobile at his command lectern, and tried to control his breathing as he watched the three majestic figures gathered on the bridge of the Ferrum. Iron Father Diederik stood by helm control, similarly awed by the towering figures of the three primarchs as they discussed how best to destroy the enemy forces on Isstvan V. His readings of history had spoken of the charisma of ancient heroes of legend, the mighty Hektor, brave Alexandyr and the sublime Torquil.

Tales spoke of how men had been struck dumb by their sheer majesty, and thus these heroes had been described in terms of wondrous hyperbole that were clearly exaggerated and designed to inflate their reputations. Balhaan had discounted most such stories as overblown fabrications, until he had first laid eyes upon a primarch and knew them to be true, but to see three of them gathered together was like nothing he could describe. No mere words could hope to convey the fearful awe he felt at beholding such perfect visions of warriors as stood on the bridge of his ship.

Ferrus Manus, clad in his shimmering fuliginous armour, stood a head taller than his brothers, pacing like a caged Medusan snow lion as he awaited news of the rest of his Legion. He punched one silver fist into his palm as he paced, and Balhaan could see the urgent need to take the fight to the traitors in his every movement.

Next to the broad, mightily muscled Primarch of the Iron Hands, Corax of the Raven Guard was tall and slender. His armour was also black, but it seemed to be utterly non-reflective, as though it swallowed any light that dared to fall upon it. The white trim of his shoulder guards was fashioned from pale ivory, and great wings of dark feathers swept upwards to either side of his pallid, aquiline features. His eyes were murderously dark coals, and long, gleaming talons of silver were unsheathed over his gauntlets. So far, the Primarch of the Raven Guard had said nothing, but Balhaan had heard this of Corax, that he was a taciturn warrior who kept his counsel until he had something of worth to impart.

The third of the primarchs was Vulkan of the Salamanders, a brother with whom Ferrus Manus had a great friendship, for both were craftsmen as well as warriors. Vulkan's skin was dark and swarthy, and his eyes carried a depth of wisdom that had humbled the greatest scholars of the Imperium. His armour was a shimmering sea green, though each gleaming ceramite plate was embellished with images of flame picked out in a profusion of coloured chips of quartz. One shoulder guard was fashioned from the skull of a great firedrake, said to have been the beast Vulkan had hunted in his contest with the Emperor hundreds of years ago, while over the other was draped a long mantle of iron-hard scales taken from the hide of another mighty drake of Nocturne.