'Is that a battle robot?' asked Caxton.

'It's much more than a robot,' said Dalia, her eyes snapping open. 'It's something far worse.'

'What?'

'A sentient machine,' gasped Dalia, still reeling from the moment of connection to its grossly warped consciousness and the awful clarity of its purpose. 'It's an artificial intelligence and it's been corrupted with something vile, something evil.'

'Evil? That's nonsense,' said Zouche. 'What do machines know of evil?'

'What does it want?' asked Severine.

Dalia looked over at Rho-mu 31 in uncomprehending terror. 'It's here to kill me.'

The Kaban Machine opened fire and the driver-servitor's compartment disintegrated in a blitzing storm of las-fire and plasma bolts. Flames boomed from the ruptured energy cells and the darkness of the tunnel was suddenly dispelled.

Rho-mu 31 grabbed Dalia and hauled her from her seat as the machine rumbled down the tunnel, its weapon arms wreathed in halos of white fire as it systematically obliterated carriage after carriage. Designed to penetrate the hulls of battle tanks and overload the void shields of Titans, its sustained fire easily sliced through the sheet metal of the mag-lev's sides.

Caxton, Severine and Zouche needed no encouragement to follow Rho-mu 31 and blundered into the corridor beyond their compartment in terror. The noise from outside the mag-lev was deafening, thudding pressure waves of explosions laced with the squeal and hiss of impacting lasers. The bark of solid rounds and the whine of ricochets echoed from the tunnel walls. The mag-lev shuddered like a wounded beast, flames and smoke erupting along its length as it was systematically riddled with gunfire.

Dalia heard screams from further along the mag-lev as passengers were chewed up in the fusillade. The corridor was a mass of terrified people, its length choked with panicked bodies. Men and women screamed and clawed at one another as they fought to escape the approaching slaughter. Rho-mu 31 gathered Dalia into his arms and forced a path through the heaving, jammed mass of people fleeing towards the rear of the mag-lev.

bellowed Rho-mu 31 in the most belligerent form of cant, and such was the ingrained reverence for a Mechanicum Protector that the majority of people did exactly that. With his weapon stave extended before him, he pushed along the corridor towards an emergency exit.

Dalia looked over Rho-mu 31's shoulder, seeing terrified faces pressing against the wall of the corridor as they slammed fists, fire extinguishers or anything else they could get their hands on to smash the glass. Through the window on the door at the end of the corridor, Dalia could see bright flames and black smoke.

'Hurry!' shouted Severine. 'For the love of the Omnissiah, hurry up!'

A searing white lance of plasma cut into the carriage, sawing through the metal and glass like a laser saw. The beam instantly sliced two-dozen people in half and Dalia wept as she smelled boiled blood and scorched meat.

'Down!' shouted Rho-mu 31, bearing Dalia and Caxton to the floor of the corridor. Severine was quick to follow and Zouche had already been borne to his knees by the stampede. The incandescent beam zipped along the corridor, killing as it went, and Dalia watched in mute horror as severed limbs, cleaved bodies and disembodied heads fell to the floor.

She rolled onto her side as the deadly beam passed overhead and droplets of molten metal splashed the floor beside her. She cried out as one scorched a thin line down her arm.

'Sacred Fathers,' hissed Zouche, rolling onto his front as an explosion further back whipped the mag-lev like a sine wave. Everyone screamed as it was lifted from the rails with a screech of torn metal and a crackling burst of arcing electrics.

Dalia scrambled on her knees towards Rho-mu 31 as the carriage tipped from the track and her world spun crazily. It crashed to the tunnel floor and the windows blew out with the force of the impact. A blizzard of crystalline fragments rained down.

The breath was knocked from her and Dalia felt blood dripping into her eyes. A heavy weight pinned her and she blinked away red tears as she heard more deafening blasts of gunfire. She couldn't tell how close it was, but the stuttering, strobing flash of weapons fire felt as though it were coming from right outside their carriage.

Dalia fought to free herself from the weight pinning her to… the ceiling? Which way was up and which was down? She couldn't hear any screams. Had the Kaban machine killed everyone?

A man's body lay sprawled across her, or at least half of him, and she cried as she pushed his bifurcated body from her. The metal beneath her - the ceiling, she was sure of it now - was sticky with warm blood, and she whimpered in terror at the sight of heaped mounds of corpses filling the corridor. The iron stink of blood was thick in her nostrils and Dalia couldn't remember a more awful smell.

She retched dryly at the sight of so many dead, terrified and numbed by the horror of how quickly their grand adventure had come to such a bloody end. Despite the stink of death, she took a deep breath and looked for her friends amid the wreckage and carnage.

Dalia saw Rho-mu 31 lying further along the buckled corridor with a jagged spar of metal impaling his shoulder. The Protector's biometrics were fluctuating, but he was alive.

Zouche lay in a heap of bodies, his face a mask of blood, but she couldn't tell whether it was his or belonged to someone else. Caxton was just behind her, pinned to the floor by a metal door in the midst of a spray of glass fragments. His eyes were open and pleading, a low moaning issuing from between bloodied lips.

Severine lay beneath a nutrient dispensing machine that had torn loose from the wall, her arm thrown out before her and twisted at an unnatural angle. Her eyes were closed, but her pained expression and rapid, shallow breaths told Dalia she was alive.

The carriage was still, no straining bodies or panicked shoving, and the only light came from smashed lumen globes that sparked and stuttered in the half-light.

After such a tremendous cacophony of violence and noise, the silence that enveloped her was as welcome as it was terrifying.

Dalia began to crawl towards Rho-mu 31. He saw her coming and shook his head, placing a finger to the grilled mouthpiece of his helmet.

At first Dalia didn't understand.

Then she heard it.

Over the creaking wreckage and tinkle of falling glass, she felt the vibration of the heavy machine through the ground as it crashed metal and ruptured bodies beneath its tracks. Dalia craned her neck to look through the shattered window into the sputtering darkness of the tunnel, and fought down the urge to cry out as she saw the monstrous form of the sentient machine rambling towards where they lay.

She felt the crawling pressure of its corrupted mind as it swept the carriage for life signs, and heard the rattle of its autoloaders feeding its weapons fresh ammunition.

It drew nearer with every breath and in moments its auspex would register their presence. Then it would kill them.

Princeps Cavalerio finished processing the feeds inloading into his casket at a rate of over six thousand data packets per second. The Martian networks had slowly returned to normal after the scrapcode plague, the diligence of the code-scrubbers and magos probandi all across the red planet finally re-establishing communications and information exchanges.

Fresh reports, petitions and pleas for aid from forges far and wide were streaming into Ascraeus Mons through the vox, across the noosphere and via optic feeds.

It was a bleak picture they painted of the Mechanicum's future.

Cavalerio let his mind swim up through the reams of liquid information that flowed around and through him. He saw Agathe's face before him, and set the biometrics of his casket from processing to consciousness.