He turned slowly towards the magnificent picture Serena d'Angelus had painted for him, its splendour matched only by his amazement at what it had become in the days since it had been delivered to his staterooms.

Fulgrim made his way through the rain of his quarters and stared into the image of his own face on the canvas. The giant in purple armour stared at him from the picture, its features, refined and regal, the mirror of his own. The eyes sparkled as though recalling some long forgotten joke, the lips curled in the curved wrinkle of the hypocrite, and the brow furrowed as though plotting some scheme of great cunning.

Even as he stared into his own features the mouth twisted and pulled at the canvas as it formed new words.

What if the alien spoke true? If Horus has indeed forsaken the Emperor, where would you stand in such a contest?

Fulgrim felt clammy sweat coat his naked flesh, repulsed by the creeping horror of the picture, yet unaccountably drawn once again to hear its words, as though they possessed some silken, siren-like attraction to him. As much as he wanted to slice his blade through the painting, he could not bear to see it destroyed.

He is the most worthy of you, said the painting, its mouth contorting under the effort of speech. If Horus were to turn his face from the Emperor, where would you stand?

'The question is immaterial,' snapped Fulgrim. 'The situation would never arise.'

Think you so? laughed the painting. Even now Horus plants the seeds of his rebellion.

Fulgrim clenched his jaw and aimed his sword at the image of himself on the canvas. 'I will not believe you?' he shouted. 'You cannot know these things.'

But I do.

'How?' begged Fulgrim. 'You are not me, you cannot be me.'

No, agreed his twin, I am not. Call me… the spirit of perfection that will guide you in the coming days.

'Horus seeks war with the Emperor?' asked Fulgrim, almost unable to speak the words such was the horror of what they represented.

He does not seek it, but it is forced upon him. The Emperor plans to abandon you all, Fulgrim. His perfection is naught but a sham! He has used you all to conquer the galaxy for him, and now seeks to ascend to godhood on the blood you have shed.

'No!' cried Fulgrim. 'I won't believe this. The Emperor is human intelligence raised above all error and imperfection, and extended to all possible truth.'

Your belief is irrelevant. It is already happening. Grand things are necessarily obscure to weak men. That which can be made explicit to the idiot is not worth my care. If Horus, can see this, how is it that you, most perfect of primarchs, cannot?

'Because you are lying!' bellowed Fulgrim, smashing his fist into one of the green marble pillars that supported the domed roof of his staterooms. Powdered stone exploded from the column, and it collapsed in a cracked pile of splintered rock.

You waste time in denial, Fulgrim. You are already on the road to joining your brother.

'I will support Horus in all things,' gasped Fulgrim, 'but turn against the Emperor… that is too far!'

You will never know what is too far until you go beyond it. I know you, Fulgrim, and have tasted the forbidden desires you hold chained within the deepest, darkest recesses of your soul. Better to murder an infant in its cradle than nurse an unacted upon desire.

'No,' said Fulgrim, raising his bloodied hand to his temple. 'I won't listen to you.'

Expose yourself to your deepest fear, Fulgrim. After that, fear has no power and the fear of freedom shrinks and vanishes. You will be free.

'Free?' cried Fulgrim. 'Betrayal is not freedom, it is damnation.'

Damnation? No! It is liberty and unfettered freedom to explore all that is and all that can be! Horus has seen beyond the veil of this mortal flesh you call life and learnt the truth of your existence. He is privy to the secrets of the Ancients, and only he can help you towards perfection.

'Perfection?' whispered Fulgrim.

Yes, perfection. The Emperor is imperfect, for if he were perfect, then such things could not happen. Perfection is slow death. Only change is constant, the signal for rebirth, the egg of the phoenix from which you arise! Ask yourself this: what is it you fear?

Fulgrim stared into the eyes of the portrait, eyes that were his own but for the awful knowledge within them. With a clarity borne of perfect understanding, Fulgrim knew the answer to the question his reflection had posed him.

'My fear is to fail,' said Fulgrim.

The cold lights of the apothecarion were bright and hostile, staring down at Marius as he lay naked on the surgical slab. His limbs were immobile, held static by gleaming steel restraints and chemical inhibitors. The feeling of vulnerability was acute, but he had vowed to obey his primarch's orders, no matter what they were, and Lord Eidolon had assured him that this was what Lord Fulgrim desired.

'Are you ready?' asked Fabius, the silver steel arms of the Apothecary's chirurgeon machine looming over him like a great spider.

Marius tried to nod, but his muscles would not obey him.

'I am,' he said, fighting to say even that.

'Excellent,' said Fabius. His narrow dark eyes bored into Marius and examined his flesh, as a butcher might examine a choice cut of meat, or a sculptor a fresh block of virgin stone.

'Lord Commander Eidolon said you would make me better than before.'

'And so I shall, Captain Vairosean,' grinned Fabius. 'You will not believe the things I can do.'

The ships of the 63rd Expedition floated like a school of silver fish above the twin worlds of the Auretian Technocracy. Sharing a common moon, the space above them was alive with electronic chatter as the Warmaster's forces prosecuted the war below. Wrecked communications satellites were debris in the upper atmosphere, and what remained of the Auretian monitors had long since plummeted as fiery meteors to the planet's surface.

Fulgrim watched the slow drift of the Warmaster's ships above the second planet, their attention fixed on the conflict raging below rather than their rear defences. He smiled as he realised that, if he was clever, he could catch his brother unawares.

'Slow to one-quarter flank speed,' ordered Fulgrim. 'All active systems to passive.'

The bridge of the Pride of the Emperor throbbed with activity as its crew hurried to obey his orders. He kept his eyes glued to the readouts and hololithic projections of the surveyor station, and issued fresh orders in response to each sensor sweep. Captain Aizel watched his every move with admiration. Fulgrim could just imagine the bitter envy that must fill any man who knew that he would never approach such genius.

The eight-week journey to the Auretian system had been one of enormous tedium for Fulgrim, with every diversion delighting him for only the briefest moment before becoming stale. He had even hoped for some catastrophe to occur in their warp translation, just for something to occupy his thoughts with some new sensation, but no such disaster had occurred.

In preparation for his meeting with his beloved brother, Fulgrim's armour had been polished to a mirror sheen, the great golden eagle's wing sweeping high over his left shoulder. His armour had been restored to its familiar brilliant purple, edged in bright gold, and inlaid with opalescent stones and gilded carvings. A long, scaled cloak was secured to his armour by silver brooches, and trailing parchments hung from his shoulder guards.

He bore no weapon, and his hands continually itched to reach for his absent sword, to feel the reassuring heat of its silver grip and the perversely comforting presence that spoke to him through Serena dAngelus's masterpiece. Though he had not wielded Fireblade in many months, he missed even its balance and fiery edge. Without a weapon, especially the one torn from the Laer temple, his thoughts were clearer, uncluttered by intrusive voices and treacherous thoughts, but try as he might, he could not bring himself to forsake the weapon.