Dantioch’s Iron Warriors were savage hand to hand fighters – equals of the unstoppable World Eaters or the Blood Angels’ loyal fervour. The Iron Warriors were deadlier still when they were cornered: cold machines of dread and determination. None had the martial grace or unadulterated skill with a blade that Nicodemus exhibited. Nicodemus batted the Iron Warrior’s bolter aside with the weight of the sizzling shield before shearing through the weapon with a murderous downwards cut of his gladius. Before the dazed Iron Warrior could snatch a hammer from his belt the Ultramarine had flashed the gladius back and forth across his opponent’s armour. The blade sang through the Iron Warrior’s chestplate and helmet, spraying the chamber with Olympian blood.

Nearby the Space Marine that had spearheaded the daring assault broke free of the geneslave mob. A chainaxe screamed from the scrum of hulking bodies. The Iron Warrior burst from the prison of muscular flesh, sweeping heads and elephantine limbs from the Sons of Dantioch in his path. Chaplain Zhnev’s crozius sang through the air on its pendula attachment, smashing the motorised axehead into pieces. The Iron Warrior responded immediately by plunging his gauntlet into a holster and drawing a bolt pistol. Before he could end the Chaplain, Tarrasch hammered the heretic with a feverish hail of bolts from his own pistols. The angle was hastily improvised and no one round found its way through the Maximus suit plating. The onslaught had cut the Space Marine’s escape dead, however, and the genestock hulks – hungry for a rematch – seized the Iron Warrior. One monster got a bulging arm around the Legiones Astartes’s armoured neck while two others snatched an arm each. The ogres gave a brutal heave on the traitor’s limbs and with a sickening crack and sudden release, the suit seals and the body within tore apart.

On the opposite side of the gauntlet-entrance the ogres’ genestock brothers were murdering Nadir-Maru Juntarians with equal delight. As las-fusillades and dark faces parted, two more armoured figures were revealed. Their armour was busy with chevron designs and yellow striping, and on their backs – either side of their suit packs – were a pair of brass promethium canisters. Stomping up through the Juntarians, the Iron Warriors presented their chunky nozzles, the scorched, dribbling muzzle of each weapon situated at the end of a long firepole.

Tarrasch turned to the blockhouse with just two words on his thin lips: ‘Take cover!’

The blast wave from the erupting inferno knocked the Iron Palatine from his armoured feet. In the confines of the chamber, the heavy flamers did their worst. Everything became roasting heat and smoke, the ink-blot obscurity punctuated by blinding streams of pressurised promethium. As gouts of destruction felt their fiery way through the defensive architecture, sound and smell dominated. Above the boom of the Iron Warrior firepoles, the chatter of bolters could still be heard. Above this was the strangled shrieking of men aflame: Angeloi, genebreeds and Nadir-Maruvians all. Scorched within their suits, Iron Warriors stumbled through the firestorm, searching for respite.

It could have been a bolt-round, fired blindly into the darkness and fury, or perhaps a stream from the flared muzzle of a lascarbine or laspistol. Most likely it was a blast from the Venerable Vastopol’s raging autocannons, but something hit one of the brass fuel canisters. A succession of explosions rippled through the thick smoke, knocking all that still lived in the chamber onto their backs. Flame rolled across ceiling and floor; through the tactical arrangement of the blockhouse; through the gauntlet entrance and down the crowded passage beyond.

Dantioch’s gauntlet grabbed the top of the platform wall like a grapnel. The Warsmith heaved himself to unsteady feet in the swirling smoke, stamping out the small fire that was his burning schematics. Cristofori was dead, as well as the injured Adamantiphract and his chirurgeon. As the smoke began to clear, Dantioch took in the blockhouse floor. There were bodies everywhere, both loyal and traitor: a carpet of scorched armour and charred flesh. Similar destruction extended up the passage to the gauntlet entrance. There was movement, however, and it wouldn’t take their attackers long to organise an assault to capitalise on the inferno.

Leaning against the wall for support, the Warsmith came down the embrasure steps.

‘Tarrasch!’ Dantioch called. From the soot and smaze came sudden movement.

‘Sir,’ came the Iron Palatine’s reply. The explosion had knocked the Iron Warrior senseless into a wall. His words were shaky but the Space Marine was alive.

‘It’s over. We are compromised. Enemy forces imminent. Get the living to their feet.’

‘Yes, my lord.’

As Tarrasch stumbled through the carnage, searching for survivors, Dantioch ran his gauntlets along the wall. The Warsmith began to knock experimentally against the stone as he slouched along its expanse. Satisfied, the Warsmith stopped and turned on the hulking Dreadnought that still stood sentinel in the middle of the blockhouse, autocannons at the ready.

‘Vastopol, are you still with us, my friend?’ the Warsmith asked.

In answer the Dreadnought just burned. The explosions had done little to the machine but scorch its adamantium and set fire to the scrolls, banners and decorative flourishes that adorned the bulky form.

‘Don’t be like that,’ Dantioch said. ‘It’s over. We could fight to the last man but what would that achieve?’

Still the Dreadnought stood immobile.

‘This isn’t Gholghis,’ Dantioch told his battle-brother. ‘It is the prerogative of the Warsmith when to war and when not to. We are beaten here. It is time to take the war elsewhere. Now get over here and help me; you may still have a story to tell.’

As the Venerable Vastopol dragged its mangled and sparking leg across the bodies of the blockhouse floor, Tarrasch worked his way through the dead and dying. The Angeloi were all dead, as were the remaining Sons of Dantioch. The raging inferno had done for both and only a handful of Legiones Astartes, protected from the worst of the explosion by their battle-plate, had survived the catastrophic accident.

‘Enemy advancing!’ Tarrasch called from the gauntlet entrance.

‘Come on, come on!’ Dantioch urged Space Marines emerging from the smoke and destruction.

Tauro Nicodemus was suddenly beside him: his immaculate armour soot-stained and blood-spattered.

‘I thought this was the fallback position,’ the Tetrarch said. The Ultramarine had accepted that he was to die there, taking as many traitor lives with him as he was able.

‘Game’s not over,’ Dantioch said. ‘Gather your weapons.’

‘Where are we going?’

‘Through this wall.’

Dantioch knocked on a section of the blockhouse wall. A deliberate, architectural weak point. ‘Vastopol.’

The Dreadnought limped at the wall, crashing through the masonry with one of its chunky shoulders. Rock and dust fell about the war machine. Extracting itself from the ragged aperture, Vastopol stood back to admit the surviving Legiones Astartes: the Warsmith, the Iron Palatine, Brother-Sergeant Ingoldt, Brothers Toledo and Baubistra, the Ultramarine Nicodemus and Chaplain Zhnev. Beyond a broad set of steep, rocky stairs extended, running parallel with the wall and reaching up into the Schadenhold’s cavernous ceiling foundations. With the Legiones Astartes striding up ahead, the Venerable Vastopol negotiated the steps with difficulty, its mangled leg a handicap on the shambling ascent.

The stairwell rumbled and shook.

‘What was that?’ Tarrasch called. For a moment nobody answered in the darkness. Then a quake rolled through the stone about them. The steps shook under their feet and fractures split the stairwell’s rough roof and walls.