‘If we are to give ourselves for this, level Iron Warrior against Iron Warrior, then it would be good to know that Guilliman has a strategy,’ said Dantioch.

‘Yes, my lord. As always, Lord Guilliman has a plan,’ the Ultramarine champion told him evenly.

As the congregation went to leave the blood-spattered Grand Reclusiam, Dantioch asked, ‘Nicodemus?’

‘Yes, Warsmith?’

‘Why me?’

‘Lord Guilliman knows of your art and expertise in the field of siegecraft. He suspects these skills will be sorely needed.’

‘He could count on my skill but what of my loyalty?’ Dantioch pressed. ‘After all, my Legion has been found wanting in its faith.’

‘You spoke candidly before, my lord. Might I be allowed to do the same?’

Dantioch nodded.

‘The Warmaster could exploit the weakness of your primarch’s pride,’ the Tetrarch explained cautiously. ‘Your history with Perturabo is no secret. Lord Guilliman feels he too can rely on this same weakness in you.’

Once again, the Warsmith nodded. To Nicodemus and to himself.

I WAS THERE. On that tiny world, in a forgotten system, in a distant corner of the galaxy: where a mighty blow was struck against the renegade Warmaster and his alliance of the lost and damned. There, on Lesser Damantyne. I was among the few, who stood against many. The brother who spilled his brothers’ blood. The son who betrayed his wayward father’s word. And that word was… heresy.

For a bloody day beyond an Ancient Terran year we fought. Olympians all. Iron Warriors answering the call of their primarch and Emperor. The cold eyes of both watching from afar. Judging. Expecting. Willing their Iron Warriors on like absentee gods drawn to mortal plight by the reek of battle: the unmistakable stench of blood and burning.

I was there when Warsmith Krendl visited upon us a swarm of Stormbirds. Disgorged from the fat cruiser Benthosand heavily-laden with troops and ordnance, the aircraft blotted out the stars and fell upon our world like a flock of winged thunderbolts. Blasting through the thick cloud of Damantyne’s hostile surface, the Stormbirds would have rocketed through the cave systems and disgorged their own brand of horror on our readying position. Warsmith Dantioch had ordered the Orphic Gate collapsed mere hours before, however, and all the flock found there was rock and destruction, as, one after another, they struck the planet surface.

I was there when the mighty god-machines of the Legio Argentum, denied entrance to the gate also, had to stride through the acid hellstorms of Lesser Damantyne. Like blind, tormented behemoths they tumbled and crashed through the squalls and cyclones, their armoured shells rust-riddled and giant automotive systems eaten away. The infamous Omnia Victrum, the sunderer of a hundred worlds, was one of three flash-flayed war machines that managed to stumble to a sinkhole colossal enough to admit their dimensions. And there the screaming hordes that crewed the god-machines were confronted with the unfathomable labyrinth of the planet’s gargantuan cave system and the reality that they might be lost for eternity in the deep and the dark.

I was there when Warsmith Dantioch ordered the giant ground-pumps to life and the lake of crude promethium burst its banks, flooding the floor of our huge cavern-home with a raging, black ichor. I watched as the Nadir-Maru 4th Juntarians and more bombardment cannon than a man could count were drowned in a deluge of oil and death. I roared my dismay as columns of my traitor brethren marched on the pumps through the settling shallows, to sabotage the great machinery. I roared my delight when my Warsmith ordered the slick surface of the crude promethium ignited about them. A blaze so bright that it not only roasted the Iron Warriors within their plate but brought light to the cavern that the depths had never known.

I was on the Schadenhold’s battlements as our own cannon and artillery placements reduced Warsmith Krendl’s reserve Stormbirds to fireballs of wreckage. I saw the small armies they landed on our keeps and towers fall to their deaths like rain from our inverse architecture. I fought with the Sons of Dantioch – genebred hulks of monstrous proportion – as they tore Nadir-Maru 4th Juntarians limb from limb in the kill zones and courtyards. I walked amongst Colonel Kruishank’s Ninth-Ward Angeloi Adamantiphracts as their disciplined las-fire lit up the ramparts and cut their traitor opposites to smouldering shreds. I looked down on a fortress swamped in carnage, where you could not walk for bodies and could not breathe for the blood that lay hanging in the air like a murderous fog.

Finally, I fought in the tight corridors and dread architecture of the Warsmith’s design. Took life on an obscene scale, face-to-face with my Iron Warrior brethren. Murdered in the Emperor’s name and matched the cold certainty of my brothers’ desire. Killed with the same chill logic and fire in my belly as my enemy had for me. Measured my might in the blood of traitors whose might should have measured my own. I was there. In the Schadenhold. On Lesser Damantyne. Where few stood against many and, amongst the fratricidal nightmare of battle, brothers bled and heresy found its form.

THE SCHADENHOLD SHOOK.

Dust rained from the low ceiling and grit danced on the dungeon floor. The subterranean blockhouse seared with gunfire. Its hoarse boom split the ear and the flash of hot muzzles dazzled the eye. Barabas Dantioch had supreme confidence in his nightmare stronghold’s design. He’d told Idriss Krendl that the Schadenhold would never be his. Even at this stage – three hundred and sixty-six Ancient Terran days into the murderous siege – he could count on the fortress keeping his word. With traitor Titans and Mechanicum war machines haunting the caverns, swarms of Stormbirds strafing the citadel towers and enemy Legiones Astartes storming its helter-skelter battlements, he knew the brute logic of the Schadenhold’s design and the rock from which that inexorability had been crafted would not let him down. Dantioch’s tactical genius extended far beyond the unrelenting architecture of the stronghold exterior: any Warsmith worth their rocksalt, regardless of the boasts they might make, planned for the inevitability of failure. A life lived under siege had taught the Iron Warriors that enemies were not to be underestimated and that all fortresses fall – sooner or later. A Warsmith’s gift was to make this eventuality as late as possible. The blockhouse was a perfect example of the principle in action.

Throughout the citadel, on every level and in every quarter, there was a blockhouse chamber. A fallback position for the Iron Warrior garrison within: each bolthole was equipped with its own secreted supplies of food, water and ammunition, as well as rudimentary medical and communications equipment. The chambers themselves were dens of devious geography, every one with its own unique design and layout. No lethal opportunity had been left unexploited and every fire arc and angle had been measured to perfection. In each the Warsmith had created a crenellated deathtrap of chokepoints, hide sites and killspots that doubled as training facilities for the Legiones Astartes warriors during the simpler, silent times of peace.

The blockhouses had not only provided Dantioch’s hard-pressed garrison with respite and supplies but had also frustrated any hopes Warsmith Krendl might have had of a swift victory, once his invading force had breached the citadel’s considerable, exterior defences. Fighting inside the Schadenhold had been as bloody as the slaughter on the battlements beyond. The fortress stank of hot metal and swift death. Every wall was a bolt-hammered vista of splatter and gore, every chamber carpeted with armoured bodies.

Kneeling down on one rusted knee, Dantioch mused over a crumpled, blood-spotted pile of schematics. The Schadenhold diagrams covered the floor of the embrasure platform and were stained and scratched with ink, Dantioch’s strategic annotations almost obscuring the detail of the stronghold’s grand design. About the Warsmith, armoured feet shuffled and the air sang with the relentless crash of firing mechanisms. Nearby slumped an Angeloi Adamantiphact, breathing through a ragged hole in his chest, while another bled away his life as an Imperial Army chirurgeon fussed over his missing arm. The edges of the schemata vellum soaked up the growing pool, but the Warsmith – feathered quill to the mouth grate of his mask – was so involved in his three-dimensional visualisation of the two-dimensional prints, that he barely noticed.