It was no barrier to Vulkan. He advanced through the gritty miasma keenly, despatching foes with his hammer as they presented themselves. His Pyre Guard were arrayed around him and together they’d cut a bloody trail to reach the halfway marker. A tactical map overlaying one corner of his retinal display told him the precise distance remaining to the arch. So vast and sprawling was the alien edifice that it dominated the short horizon constantly, seen through an iridescent kine-shield. Icons identifying the rest of his Legion suggested they were making solid progress too, but the primarch and his praetorians had a definite lead. The Army divisions were faring less well.

Sustained auto-fire had mulched much of the jungle foliage into a mist that got into the lungs of the Phaerians and any of their leaders who weren’t wearing rebreather masks. Between the screams of those brought down by the eldar’s salvoes or assassinated by sniper shot, Vulkan heard men choking on the vaporised vegetation as they were pushed into the breach by their eager overseers.

With the cessation of the initial Army bombardment, the air was thinning again. A section of broken column resolved through the slow dispersal of settling earth particles. Architecturally, it was not unlike the node temple they’d encountered earlier and suggested a civilisation that pre-dated human colonisation had once dominated this world. Likely it had been the eldar, but in more halcyon times. Vulkan saw the bodies of the aliens strewn around its circular plinth. It was a grim reminder of just how much they’d lost in the dark millennia before the Great Crusade and man’s pre-eminence in the galaxy.

That the eldar had lasted this long was testament to their persistence and courage. Any foe willing to try to resist the strength and power of two primarchs was worthy of respect, however grudgingly given.

What bothered Vulkan, as he’d torn into the aliens’ ranks, was why they were so dogged when they faced certain annihilation. Flee and they would live. What did it matter if this world was lost to them? It was little more than a wild frontier world cluttered with broken remnants of stone that no longer mattered. Why would the eldar cling to it with such fatal determination? As before, the sense of something unknown sprang to the fore of Vulkan’s mind, but he was unable to give his suspicions form or cause. For now, combat focused his mind, gave him a purpose that supplanted all other concerns.

From the initial weapons exchange, the battle had devolved into a series of closer skirmishes.

Revealed through the clearing fog, Army divisions were assaulting in force on several fronts with bayonets, knives and close-quarters gunfire. Sheer weight of numbers and the single-minded drive of their overseers and discipline-masters provided the men with small but increasingly significant victories. The eldar outmatched them one-on-one but their numbers were dwindling.

Divisions from both the Salamanders and Iron Hands were making punishing inroads, and the air was rank with the stink of reptilian carcasses. Both Legions were stolid and determined. Vulkan’s sons attacked with a cleansing flame, burning the eldar back and crushing any survivors with a combined push, whereas the warriors of Ferrus Manus engaged the enemy with the same molten anger as their primarch, breaking the aliens with shock and awe. The Morlocks in particular were singular fighters, the equal of the Firedrakes, and Vulkan was glad to be fighting alongside his brother and his praetorians. Even still, he would not be outdone lightly.

Such was the ferocity of Vulkan and his Pyre Guard, a widening gyre of dead and broken eldar had formed around them. It presented a rare moment to pause, and in the brief respite, Vulkan looked for Ferrus. He wasn’t hard to find.

The Gorgon fought without his battle-helm and was bludgeoning his way into the enemy’s flank. Forgebreakerrose and fell like a metronome in his silver hands, crushing skulls and smashing eldar into the air with the hammer’s every formidable swing. Zeal and fury radiated from his granite face as he drove the Morlocks relentlessly. Blistering fire flared between both sides but none of the Iron Hands slowed, let alone fell.

The kindred of eldar fighting them was soon overwhelmed and lethally despatched, but more enemies were coming.

Encouraged by the bloodletting, a pack of crimson-scaled carnodons snorted a throaty challenge. Their riders bellowed for the monsters to charge. The Iron Hands were still cutting down a few defiant stragglers from the eldar kindred when Ferrus Manus bellowed at them. Vulkan could read his lips and imagine his wrath.

“Finish them now!”

In his eagerness to end the fight quickly, a wayward blow from the primarch’s hammer crunched through the side of a nearby column and sent it tumbling. Vulkan balked when he saw who was in its path.

Like a ghost materialising corporeally in the fog, the boy-child appeared from nowhere. His naked torso was drenched in sweat and someone else’s blood, and he wailed blindly as he fled. As if sensing the sudden danger, the boy-child froze abruptly in the shadow of the falling column and could only watch his impending death approaching. He raised his arms feebly over his eyes.

Don’t look, child…

Vulkan was running, leaving his praetorians behind him. It would not be enough. Without intervention, the column would crush the boy-child. He cried out, knowing that to even witness the death of such an innocent would forever stain his immortal soul.

Arrested from his battle frenzy by his brother’s anguish, Ferrus turned and saw the danger.

“First-Captain!” he bellowed, and Gabriel Santar was there.

At his urging, the Morlocks drove on ahead of him to meet the carnodons with bolters flaring. Santar lagged behind and threw himself against the collapsing column. Using both hands, he caught the chunk of broken stone and held it. Servos in his bionic arm and legs whined in protest at the sudden strain they were put under.

He had enough strength spare to turn his head towards the terrified infant. His grey eyes churned with the turmoil of a captured storm as he glowered down at him. “Flee now!”

Screaming, the boy-child ran.

And as if heralding a flood, there were suddenly hundreds of the fleeing humans. Like leaves blown about on an eddying breeze, the frightened flock scurried in all directions and from everywhere at once.

“Terra and the Emperor,” breathed Ferrus Manus, unable to comprehend the insane exodus.

“My lord…”

In spite of his cybernetics, Gabriel Santar’s legs buckled to the knee and his elbows bent with the sheer immense weight of the column. The Gorgon was quick to relieve him, stowing Forgebreakerand hoisting the broken chunk of rock from his equerry as though it were little more than a bolter.

He roared to the Morlocks, who were seconds from hand-to-hand combat, “ down!” and hurled the shattered pillar like a spear. The front carnodon took the brunt of the improvised missile, howling in agony as its forelegs were broken. It hit the ground muzzle first, trammelling the other beasts that tripped and blundered, losing the impetus of their attack. The Morlocks were quickly amongst them, Santar having rejoined their ranks.

Ferrus Manus glowered at Vulkan, his gimlet gaze singling out the other primarch easily in the throng.

“I suppose you’re going to tell me to try not to kill them?” he declared through the feed.

It was easier said than done. Though the boy-child had reached relative safety, Vulkan saw hundreds fleeing in his wake. The natives were running loose all over the killing fields, heedless of the danger. Emerging from their nests and hidden places in a panicked mass, it was as if the humans had been displaced from a major settlement by the eldar war host. Either that or it was some desperate gambit on the aliens’ part to try to disrupt the Imperium’s inevitable victory.