The music swept onwards, rising and sweeping around La Fenice like a whirlwind, until at last it reached the thunderous crescendo of its climax, whereupon the curtain rose in a flurry of dramatic and spectacular sensations.

Julius rose to his feet as the peals of music drove ever onward, the overture continuing in an unbroken melody of sounds, and the sheer visceral emotions that filled him on seeing what lay beyond was like a punch to the guts.

The interior of the Laer temple had been recreated in painstaking detail, its eye-watering colours and dimensions faithfully recreated by the artists and sculptors who had walked within its magnificence.

Vivid lights flashed around the theatre, and Julius felt a momentary disorientation as more music blasted from the orchestra, a new piece with darker overtones and an aching sense of imminent tragedy. The waves of sound and harmony flowed outwards from the stage and over the audience, immersing them in the power and sensations he had first felt when he had followed Fulgrim into the temple.

The effect was immediately obvious, and a shudder of pleasure rippled through the audience as the powerful notes flowed into and through them. Dizzying colours flashed through the air, and as the music built to yet another high, a second spotlight stabbed onto the stage. The slender form of Coraline Aseneca, the prima donna of the Maraviglia, appeared.

Julius had never heard Coraline's voice before and was unprepared for the sheer virtuosity and power of her singing. Her tone was in perfect, discordant harmony with Bequa's music, reaching heights no human voice could possibly attain. Yet attain them she did, the energy of her soprano's voice reaching beyond the realms of the five senses, all of which were being stimulated it seemed to Julius.

He leaned forwards, laughing uncontrollably as an intoxicating rush of emotions seized him, and he clasped his hands to his head at such overstimulation. A chorus joined Coraline Aseneca on stage, though Julius hardly noticed them, their intermingled voices allowing the soprano's voice to swoop through even more unfeasible notes, which reached into the very hindbrain to pluck at sensory apparatus Julius was not even aware he possessed.

Julius forced himself to look away from the stage, enthralled and terrified by what he was seeing and hearing. What manner of being could hear music of such terrible power and retain his sanity? Man was not meant to listen to this, the birthing cry of a beautiful and terrible god as it forced its way into existence.

Eidolon and Marius were as ensnared by the spectacle of the Maraviglia as he was, pinned to their seats in rapture. The jaws of both warriors were locked open as though they entertained the idea of joining with Coraline Aseneca in song, but there was panic in their eyes as their mouths stretched wide in silent screams, bones cracking as they distended like a snake about to devour its prey. Hideous, soundless shrieks issued from their throats, and Julius forced himself to look at Fulgrim for fear that he might strike down his friends in his fugue state.

Fulgrim gripped the edge of the Phoenician's Nest, leaning forward as though forcing passage through a powerful wind. His hair writhed around his head and his dark eyes burned with a violet fire as he revelled in the cacophony.

'What is happening?' cried Julius, his voice swept up and becoming part of the music. Fulgrim turned his dark eyes upon him, and Julius cried out as he saw an age of darkness within them, galaxies and stars wheeling in their depths as unknown power flowed through him.

'It's beautiful,' said Fulgrim, his voice barely above a whisper, but sounding deafening to Julius as he propelled himself from his seat and fell to his knees at the edge of the box. 'Horus spoke of power, but I never imagined…'

Julius watched in wonder, realising the he could actually see the soprano's music as it reached out into the audience and slithered amongst them like a living thing. Their shrieks and cries penetrated the fog of music that writhed in his brain, and he saw all manner of horrors enacted throughout the audience, as friends turned and fought each other with fists and teeth. Some audience members fell upon one another with carnal lust, and the heaving crowd soon resembled a great wounded beast, convulsing in agonised throes of death and desire.

Nor was it simply mortals who were affected. The Astartes too were swept up in the surging power generated by the Maraviglia. Blood was spilled as the emotions of the Astartes were overloaded with sensational excess, and were vented in the only way men bred as warriors knew how. An orgy of killing spread from the stage, blood running in rivers as the power of the music thundered through La Venice.

Julius heard a great buzzing, creaking sound, like a great sheet of sailcloth being ripped to shreds, and he turned to see the mighty portrait of Fulgrim writhing and stretching at the canvas as though its painted subject fought to be free of the constraints of the frame. Fires blazed in its eyes and a howling shriek that sounded as though it echoed down an impossibly long tunnel filled his skull with a monstrous thirst and the promise of horrific splendours.

Lights blazed around the theatre, flowing from the orchestra pit like liquid, the greasy, electrical fire lifting from the bizarre instruments and achieving physicality as they became liquid serpents of myriad colours. Madness and excess followed the light, and all those it touched gave themselves over to the wildest, darkest delights of their inner psyches.

The orchestra played as though their limbs were not their own, their faces twisted in horrified rictus masks and their hands frenziedly dancing across their instruments with violent life. The music held them in its grip and was not about to let any weakness on the part of its creators deny its existence.

Julius heard notes of agony enter Coraline Aseneca's voice, and managed to lift his eyes to the stage, where the prima donna danced in a wild, exuberant ballet as the choristers screamed in unnatural counterpoint. Her limbs snapped and twisted in a manner no human limb was designed to, and he could hear the cracking of her bones as it became part of the million melodies filling the theatre. He could see that she was dead, her eyes lifeless. Every bone in her body turned to powder, and yet the song poured from her still.

The madness and frenzy engulfing La Venice soared to new heights of excess as all flesh was infected with the maelstrom of sights and sounds coming from the stage. Julius watched as Astartes clubbed mortals to death with their fists and drank their blood or ate their flesh, scarring their skin with the broken bones and draping the torn skin of their victims about them like grisly shawls.

Vast orgies of mortals shuddered on the blood slick parquet as the living and the dead became vessels for the dark energies pouring into the world, every violation imaginable willingly inflicted.

At the centre of the madness, Bequa Kynska conducted the chaos with a delirious smile of triumph plastered across her face. Julius saw the knowledge that this was her greatest work in the light of her eyes as she stared in rapt adoration at Fulgrim.

Then, without warning, a terrifying scream cut through the crescendo of noise, and Julius saw the abused form of Coraline Aseneca twist into the air, her limbs spread-eagled as some unknown power seized the broken meat and gristle of her body and warped it into some new, hideous form. Her shattered limbs straightened, becoming lithe and graceful once again, the flesh taking on a pale lilac hue. Where before Coraline had been clad in a shimmering dress of blue silk, the fabric transformed into a harness of gleaming black leather that revealed the supple beauty of the soft flesh formed from the ruin of her corpse.