The Warsmith had blessed the Schadenhold with every modern structural fortification: concentric hornworks; bunkers; murder zones; drum keeps; artillery emplacements and kill-towers. The fortress was a monstrous study in 30th Millennium siegecraft. For Dantioch, however, location was everything. Without the natural advantages of material, elevation and environment, all other architectural concerns were mere flourish. A stronghold built in a strategically weak location was certain to fall, as many of Dantioch’s kindred in the other Legions had discovered during the early trials of Compliance. Even the Imperial Fists had had their failures.

Dantioch had hated Lesser Damantyne from the moment he had set foot on the dread rock and had felt instantly that the planet hated him also. It was as though the world did not want him there and that appealed to the Warsmith’s tactical sensibilities: he could use Damantyne’s environmental hostilities to his advantage. The small planetoid was situated in a crowded debris field of spinning rock, metal and ice that made it seem unfinished and hazardous from the start. The cruisers of the 51st Expedition that had brought the Warsmith and his Iron Warriors there had negotiated the field with difficulty. Although the planet had tolerable gravity and low-lying oxygen that made an outpost possible, the surface was a swirling hellstorm of hurricane winds, lashing lightning and highly corrosive, acid cloud cover. Nothing lived there: nothing could live on the surface. The acidic atmosphere ate armour and ordnance like a hungry beast, rapidly stripping it away layer by layer in an effort to dissolve the flesh and soft tissue of the Legiones Astartes beneath. Even the most heavily armoured could only expect to survive mere minutes on the surface.

This made vertical, high-speed insertions by Stormbird the sole way down and that was only if the pilot was skilful enough to punch through the blinding cloud cover and down into one of the narrow, bottomless sinkholes that punctuated the rocky surface. Through some natural perversity of Damantyne’s early evolution, the planetary crust was riddled with air pockets, cavities and vast open spaces: a cavern system of staggering proportion and labyrinthine madness. Dantioch chose the very heart of this madness as the perfect location for his fortress, in a vaulted subterranean space so colossal it had its own primitive weather system.

‘From iron cometh strength. From strength cometh will. From will cometh faith. From faith cometh honour. From honour cometh iron. This is the Unbreakable Litany. May it forever be so. Dominum imperator ac ferrum aeturnum.’

The Iron Warriors were not the first to have made Lesser Damantyne their home. Below the surface, the lithic world was rich with life which had evolved in the deep and the dark. The only real threat to the Emperor’s chosen were the megacephalopods: monsters that stalked the caverns with their sinuous tentacles and could collapse their rubbery bulk through the most torturous of cave tunnels, creating new entrances with their titanium beaks. The Legiones Astartes, first few years on Lesser Damantyne comprised a war of extermination on the xenos brutes, who seemed intent on tearing down any structures the IV Legion attempted to erect.

With the alien threat hunted to extinction, Dantioch began construction on his greatest work: the Schadenhold. While Iron Warriors had been battling chthonic monstrosities for planetary supremacy, Dantioch had had his Apothecaries and Adeptus Mechanicum advisors hard at work creating the muscle that would build his mega-fortress. Iron Warrior laboratories perfected genestock slave soldiers, colloquially known as the Sons of Dantioch. Although the Warsmith’s face had been hidden for many years behind the iron of his impassive mask, it was plain to see on the gruesome hulks that had built the Schadenhold.

Taller and broader than a Space Marine, the genebreeds used the raw power of their monstrous bulk to mine, move and carve the stone from which the fortress was crafted. As well as physical prowess the slave soldiers had also inherited some of their gene-father’s cold, technical skill and the Schadenhold was more than a hastily constructed rock edifice: it was an enormous example of strategic art and siegecraft. With the fortress complete, the Sons of Dantioch found new roles in the maintenance and basic operation of the citadel and as close-quarters shock troops for the concentric kill zones that layered the stronghold. It pleased the ailing Warsmith to be surrounded by brute examples of his own diminished youth and physical supremacy and, in turn, the slave soldiers honoured their gene-father with a simple, unshakable faith and loyalty: a fealty to the Emperor as father of the primarch and the primarch as father of their own.

‘I never tire of looking at it,’ a voice cut through the darkness behind. It was Zygmund Tarrasch, the Schadenhold’s Iron Palatine. Dantioch grunted, bringing an end to his mumbled devotions. Perhaps the Adamantiphract had sent for him; or perhaps the Iron Palatine had news.

The Space Marine joined his Warsmith at the rail and peered up at the magnificence of the fortress above. Although Dantioch was Warsmith and ranking Legiones Astartes among the thirty-strong Iron Warrior garrison left behind by the 51st Expeditionary Fleet, his condition had forced him to devolve responsibility for the fortress and its day-to-day defence to another. He’d chosen Tarrasch as Iron Palatine because he was a Space Marine of character and imagination. The cold logic of the IV Legion had served the Iron Warriors well but, even among their number, there were those whose contribution to Compliance was more than just a conqueror’s thirst – those who appreciated the beauty of human endeavour and achievement, not just the tactical satisfaction of victory and the hot delight of battle.

‘Reminds me of the night sky,’ Tarrasch told his Warsmith. The Iron Palatine nodded to himself. ‘I miss the sky.’

Dantioch had never really thought of the Schadenhold in that way before. It was certainly a spectacle to behold and the final facet in the Warsmith’s ingenious design, for the two Iron Warriors were standing on a circular observation platform, situated around the steeple-point of the tallest of the Schadenhold’s citadel towers. Only, the tower did not point towards the sky or even at the cavern ceiling: it pointed down at the cavern floor.

The Schadenhold had been hewn out of a gigantic, conical rock formation protruding from the roof of the cave. Dantioch had immediately appreciated the rock feature’s potential and committed his troops to the difficult and perilous task of carving out an inverse citadel. This hung upside-down, but all chambers, stairwells and interior architecture were oriented skywards. The communications spires and steeple-scanners at the very bottom of the fortress were hanging several thousand metres above a vast naturally-occurring lake of crude promethium, which bubbled up from the planet depths. At the very top of the stronghold were the dungeons and oubliettes, situated high in the cavern roof.

As Dantioch cast his weary eyes up the architecture, he came to appreciate the comparison the Iron Palatine was making. In the bleak darkness of the gargantuan cavern, the bright glare of the fortress searchlamps and soft pinpricks of illumination escaping the embrasure murder holes appeared like a constellation in a deep night sky. This was accentuated further by the phosphorescent patches of bacteria that feasted on the feldspar in the cavern roof and the dull glints reflecting off the shiny, pitch surface of oozing promethium below: each giving the appearance of ever more distant stars and galaxies.

‘You have news?’ Dantioch put to Tarrasch.

‘Yes, Warsmith,’ the Iron Palatine reported. The Space Marine was also in full armour and Legion colours, bar gauntlets and helmet, which he clutched in one arm. The vigilance (or paranoia, as some of the other Legions believed) of the Iron Warriors was well known and the Schadenhold and its garrison maintained a constant state of battle readiness. Tarrasch ran a hand across the top of his bald head. His dark eyes and flesh were the primarch’s own, a blessing to his sons. As the Warsmith turned and the light of the observation platform penetrated the slits of his iron mask, Tarrasch caught a glimpse of sallow, bloodshot eyes and wrinkled skin, discoloured with age.