She regretted her smug tone instantly as Remiare ghosted closer and Mellicin saw the red light of the magma lagoon reflected on her death mask. Her face was the visage of something vile and terrible, a leering monster from her darkest nightmares. Even amid her fear, she recognised the exquisite work of the assassin's gravitic thrusters, the sinuous form of a killer bred and trained from birth.

'Then that's very bad news for you.'

'And why's that?' asked Mellicin, trying to muster some bravado.

'Because nothing is ever really erased, Mellicin,' said Remiare as a silver spike extended from her forefinger.

Despite the heat in the small dwelling hab, Mellicin suddenly felt very cold indeed as she recognised it as a data spike.

'Why do you want to find Dalia?' asked Mellicin, the words coming out in a fear-induced rush. 'I mean, she's nothing, just a transcriber from Terra. All she did was take notes of our work. Really, why do you want her?'

Remiare's head darted forward like a feeding bird's and she laughed, the sound soulless and dead. 'You are trying to keep me talking because you believe help is on its way, but it isn't. No one is coming, Mellicin. I am the only one hearing that insultingly simple silent alarm your implants are broadcasting.'

'I'm telling you, I erased the things you're looking for!'

'You may have erased your memory coils, but the soft meat beneath remembers,' said Remiare while softly wagging her finger. 'The Mechanicum never deletes anything.'

Mellicin glanced down at her cup of caffeine and wondered if she would be quick enough to throw it in the assassin's face. That question was answered a moment later. One second, the red-clad woman was standing before her, the next she was seated next to her, pressing her against the warm glass of her hab.

A hand with fingers like steel rods shot out and gripped her throat, tilting her head back.

'I don't know what you want!' screamed Mellicin as the assassin's data spike pressed against the augmetic orb that replaced her right eye.

'I'll find what I want,' promised Remiare. 'All I have to do is dig deep enough.'

He had always dreaded this, but now that it was his life, he knew there had been nothing to fear. In the world of flesh, his body had been aging and weakening, but here in this world of amniotic suspension he was all-powerful and all-conquering.

In a simulated engine war, Princeps Cavalerio fought and killed like a living metal god, bestriding the virtual arena like a colossus of battle. His enemies died: skitarii crushed underfoot, Reavers torn to pieces in the terrible, smashing hell of engine combat and Warlords blasted apart with weapons fire in murderous killing salvoes.

The world of flesh was over for Cavalerio. The world of metal was now his domain.

Liquid data spiralled around him, fed to him through receptors implanted beneath his skin, filling his sensory apparatus with information that would overwhelm the brains of those less augmented than he. Darts of light, each one carrying a welter of data, swirled around him like shoals of glowing fish as he ended yet another simulation as the victor.

Cavalerio was unrecognisable as the spare, limping mortal that had walked the surface of Mars. A man he had been, but a creation of the Mechanicum he was now. His pallid flesh floated in nutrient-rich jelly, hung from a multitude of cables that connected him to the world around him in ways too numerous to count.

Each day since his incarceration within the casket brought new attachments, new augmetics and new sensations. Only now did he realise how imperfect had his existence been as a mere mortal, confined to a mere five senses.

A thick inflexible cable pierced his spine between the lumbar vertebrae, while other, more delicate wires were plugged into his eye sockets. A forest of cables extruded from the rear of his cranial cavity that would link to the Manifold when he once again took charge of an engine. Both arms were encased in metal to his elbows, and both his feet had been amputated and replaced with haptic sheaths.

The transition had been difficult and not without setbacks, but his famulous, Agathe, had been with him every step of the way, soothing him, cajoling him and encouraging him to overcome every problem. Though initially hostile to the idea of a famulous, Cavalerio now appreciated how vital such a person was when you were confined to an amniotic tank.

The terrible, aching loss of Victorix Magna still haunted his nightmares, as he knew it would for the rest of his days. No princeps survived the death of his engine without psychological scarring, but with every simulated engagement, his warlike confidence grew stronger. Soon his ability to command an engine became faster and more efficient, until he knew he was better than he ever had been in his previous life.

As this latest simulation came to an end, the fury of battle and the exhilaration of connection faded from his consciousness with a sharp pang of regret. It wasn't the same as physically disengaging from an engine, but it was close, and he could already feel the hunger to go back in creeping at the edge of his psyche.

he canted in a soft sigh of binary.

His awareness of the world around him swam into focus as the images of battle faded like banished phantoms. Slowly the world of reality began to impose itself on his perception. Though Cavalerio no longer saw the world as he once had, the sensorium installed as part of his casket allowed him even greater acuity than ever before. He identified the biometrics of the two people standing in his casket chamber before any visual recognition was made.

He could see Agathe's physical form, which was short and slightly rounded, as well as reading her biometrics and the electrical field densities of her subtle augmetics. Her noospheric modifications flickered and tiny geysers of data light streamed above her head.

The second figure was Princeps Sharaq.

'My princeps?' said Agathe, startled by his sudden vocalisation. 'Do you require anything?'

'Hmmm? No, Agathe, I was just thinking aloud.'

'Congratulations on another successful engagement, Indias,' said Sharaq.

'Thank you, Kel,' said Cavalerio. 'Did you see how I took down the second Warlord?'

Sharaq smiled, and Cavalerio read the genuine pleasure his friend took in the accomplishment. 'I saw it, my princeps. Masterful.'

'I know,' said Cavalerio without arrogance. 'I am faster and more cohesive in my command than ever before. I merely think an order and the engine responds. Data streams into me straight from the Manifold, which increases my reaction and response times by an average of nine point seven per cent. That's more than the difference between life and death in an engine fight.'

'That's good to hear,' said Sharaq. 'You're adjusting well, then?'

'I am, Kel, I am. My days are full. I fight simulated engagements every day, though only Agathe watches me now. Between my battles and surgery, Princeps Kasim comes to check on my progress, and we share stories of our glorious Legio's history.'

'And the casket?' asked Sharaq. 'You don't miss… well, flesh?'

Cavalerio hesitated before answering. 'It was difficult,' he admitted at last. 'For the longest time I thought I would go mad in here, but Agathe has helped many a princeps adjust to his new life. And, as time went on, I began to understand that this was what I was destined for.'

'Destined?'

'Yes, Kel, destined. I don't know why I resisted immersion for all those years. I link with the Manifold and it's so much closer than it was before. When I commanded Victorix Magna I could feel what she felt, but it was borrowed sensation. Now I am the engine. This shouldn't be the last resort of an aging or injured princeps, this should be the standard method of command for all the bigger engines.'