'Former?' Nemiel inquired.

Archoi nodded gravely. 'I regret that the esteemed Arch-Magos was slain, twelve-point-eight hours ago, while coordinating the defence of the forge,' he said. 'As the senior surviving member of Vertullus's staff, I am now the acting Arch-Magos of Diamat.'

Off to the south, a deep, brassy rumble shook the air. It swelled in volume, the source climbing slowly into the sky. Nemiel turned and saw a pair of ships boosting ponderously into orbit on pillars of cyan light.

'The rebels have had enough,' Kohl declared. There was a grim note of triumph in his voice. 'They're pulling out.'

'Indeed,' Archoi replied. 'Your primarch contacted us six-point-three-seven minutes previously, declaring that rebel forces in orbit are in full retreat.' The magos raised his arms, as if in benediction. 'Victory is yours, noble Astartes. Diamat is saved.'

Archoi's synthesised voice fell silent, giving way to the fading thunder of the fleeing transports and distant rumble of Imperial vehicles. A rattle of small arms fire echoed in the distance. The Praetorians stared mutely at Nemiel and the Dark Angels, their augmented bodies as still as statues. Blood and lubricants leaked slowly from their wounds.

Nemiel couldn't help but think that Archoi was being a bit premature.

'Naturally, we're very grateful that you came when you did,' Taddeus Kulik said, though the look in the governor's hooded eyes suggested just the opposite.

The primarch's sanctum aboard the Invincible Reason was a single, large chamber that stretched from one side of the warship's superstructure to the other and subdivided into smaller, more intimate spaces by fluted columns of structural steel. Tall, arched viewports to port and starboard threw long, sharp-edged shadows across the mosaics inlaid onto the deck, and hinted at the angular shapes of furnishings in the surrounding spaces. Fragments of hull plating had gouged the portside viewports in chaotic patterns, refracting the red light of Diamat's sun like a scattering of polished rubies.

Jonson typically kept the lighting dim in the sanctum, preferring to work solely by starlight when possible, but out of consideration for his guests he'd lit the lumen-sconces on the pillars surrounding the large, hexagonally-shaped meeting space in the centre of the great chamber. A carved wooden campaign chair had been provided for the governor, who had been hit in the leg by a Iasgun bolt during the Dragoons' counterattack. A chirurgeon from the Imperial palace and a medicae servitor stood a discreet distance away, ready with painkillers should Kulik require them. The governor, a man in his middle years, still wore the battle-scarred carapace armour he'd fought in just a few hours before. A stained compression bandage was wrapped around his right thigh, and an old power sword hung from a scabbard at his hip. His pale grey eyes were bright with pain and fatigue, and though he made a point to relax into the back of his chair, the set of his shoulders was tense.

Magos Archoi stood a few paces to the governor's right, his metal hands folded at his waist. He had changed out of his simple Mechanicum robe for his audience with the primarch, garbing himself in the formal attire of his late predecessor. The heavy robes of office were woven with gold and platinum thread, worked into complicated patterns that resembled nothing so much as integrated circuit paths; the sleeves were wide and terminated just below the elbow, revealing the intricate craftsmanship of Archoi's bionic arms. The magos had drawn back his hood, exposing the polished metal of his lower skull and neck. Data cables and coolant tubes ran in bundles along either side of his steel throat; auspex nodes and receptor pits were arranged around the vox grill set in the space where his mouth used to be. The magos had augmetic eyes set into the flesh of his upper face, glowing with faint pinpoints of blue light. His bald scalp was pale and dotted with faint scars. Nemiel couldn't read the magos at all; Archoi's body betrayed nothing but machine-like inscrutability. A pair of hooded acolytes stood a precise six paces behind him; heads bowed and muttering to one another in muted blurts of binaric cant.

Lion El'Jonson studied the two officials over the tips of his steepled fingers. He sat in a high-backed, throne-like chair carved from Calibanite oak that only served to magnify his towering physical presence, his demeanour confident and utterly composed. Looking at him, one would never know that he'd been fighting for his life in a space battle just a short while before.

'Diamat's troubles are far from over, Governor Kulik,' Jonson replied gravely. 'There are resources here that Horus must have in order to prevail in the coming conflict with the Emperor. As soon as the survivors of his raiding fleet return to Isstvan, he'll immediately start putting together a new force - and this time it won't be comprised of renegade warships and former Imperial Army troops.' His gaze drifted to the red-stained viewports to port, his expression thoughtful. 'I expect we have no more than two and a half weeks, three at most, before they return. We need to make the most of it.'

Kulik eyed Jonson warily. 'And what exactly would you have us do, Primarch Jonson?' he asked.

The cynical tone in the governor's voice shocked Nemiel. He was standing to the right of Jonson's chair, turned so that he could address the primarch or the two officials if required. Upon returning to the flagship he'd seen to the needs of his squad and then spent more than an hour in the Apothecarium having bits of steel removed from his body. His battered wargear had been handed off to the ship's armourers for repairs, and he'd clad himself in a simple, hooded surplice before reporting to the primarch. His hands clenched reflexively at the near-insolent tone in the governor's voice.

Kulik acted as though Jonson was as much of a danger as Horus - and why not, Nemiel thought? Four Legions had already cast off their ties to the Emperor, and the entire Segmentum was coming apart at the seams. Everyone's motives were suspect. The realisation left him cold.

Jonson didn't miss the tone in Kulik's voice either. He turned back to the governor, his expression an icy mask. 'I would have you continue to do your duty, sir,' he said coldly. 'We must defend this planet at all costs. The future of the Imperium might well depend upon it.'

Governor Kulik grimaced, shifting uncomfortably in his seat. He rubbed the bandage on his leg, but Nemiel wondered if that was what truly pained him. 'My people don't have much left to give,' he said gravely. 'The rebels smashed every city and town from orbit. We don't even know for sure how many people are still alive. There's been no time to count all the bodies, much less bury them.'

'What of the Dragoons?' the primarch asked.

Kulik sighed. 'We threw everything we had left into the counterattack once we learned that the company covering the forge's south entrance had been overrun.' The governor had been a military man in his youth. When the commander of the Dragoons had been killed in an atomic strike early in the rebel attack, and the Imperial palace had been bombed to rubble, he put on a Dragoon's carapace armour and took charge of the planet's defence. Kulik was a man who took his duties to the Imperium seriously.

'I've got perhaps one full regiment's worth of troops, cobbled together from half a dozen units, and most of an armoured battalion left,' he said, then shot a venomous look at Magos Archoi. 'On the other hand, the Mechanicum's troops saw little or no action during the attack, so they're likely to be at full strength.'

Jonson turned to the magos and raised an inquisitive eyebrow. 'Is that so?' he asked. His tone was mild, but Nemiel saw a gleam of anger in the primarch's eye.