“Fire-born!” It was as much a yell of defiance as it was a cry for reinforcement to the others.

Kaitar and Luminor closed in, robbing the warlock of a killing blow. The view was narrowing, made worse by his battle-helm, so Heka’tan tore at the release clamps to discard it.

It clattered to the ground and the smells, sights and sounds of the alien jungle staggered him before his genhanced senses could compensate. He still carried his chainsword, buzzing belligerently in his hand. One of Bannon’s ex-flamer division appeared in Heka’tan’s peripheral vision and he shouted to him above the din.

“Legionary! Hell and flame!”

A swathe of burning promethium swept over the combatants.

Kaitar fell, buffeted by the blast and on fire, while Luminor shielded himself with his forearm. The warlock thwarted the flame storm with another kine-shield, but as he threw up one defence he lowered another. Heka’tan leapt through the blaze with his chainsword in a two-handed grip and brought it down savagely as he landed.

A feeble, choking sound emanated from the eldar’s gullet as he swallowed a metre of churning blade. All the wards and sigils protecting the alien were broken, his preternatural swiftness undone in a single brutal moment. He glared at Heka’tan who glared back, his eyes alive with a vengeful crimson glow. Pain should have slowed him, taken him out of the fight, but the sons of Vulkan were tenacious, just as their father had taught them to be.

He came in close, teeth locked together in half grimace and half snarl. “Salamanders fight as one!”

A gobbet of acid spit seared the ashen cheek of the eldar as Heka’tan visited a final insult upon him before the light in the alien’s eyes dimmed and he died. Wrenching his blade from the corpse, Heka’tan prepared to fight on.

Ahead of the Salamanders was the node, but the warlock had bought the others in his coven enough time to tap into its power. A coruscation of energy was rippling between the three witches as if the stone was feeding and enhancing their abilities.

Heka’tan had time to lift his chainblade in a rallying gesture before a lightning whip struck out from the node. The eldar coven channelled it, a bending crackling bolt of energy that ripped Dreadnoughts off their feet and flattened Salamanders. It swept across the Legion in a wave, leaving electrified and scorched battle-plate behind it. The eldar still engaged in the melee were struck too, the shimmering beam was undiscriminating, and Heka’tan realised then just what they were willing to sacrifice to protect the node. Mercifully he and his command squad had been spared from the first bolt but a second was already building.

Unleashed in a matter of seconds, the bolt would easily outstrip him for pace. It hurt like hellfire but still Heka’tan ran with all the fading strength in his body.

ENGINES SCREAMING, the Stormbird drew closer to the lightning storm. A flash lit the darkened interior of the hold, revealing the forbidding form of Vulkan standing by the open side-hatch. It was drawn as wide as it would go and the wind whipped within the gunship, buffeting the oaths of moment pinned to the warriors’ armour. Vulkan was stooped, eyes narrowed as he focused on the node. Its pointed tip was the focal point for the storm and the runes along its surface glowed in sympathetic union with the lightning. Even from above and at distance, it was monolithic. Destroying it would not be easy. The grip Vulkan had around his hammer’s haft tightened.

Behind him, the Pyre Guard waited with barely fettered aggression.

Unleash us…

The primarch could sense what they desired as surely as he felt it in his own blood.

A crack of lightning surged past the side of the ship, clipping one of its wings, and the hold shuddered and pitched. Smoke trailed from the wound in the armour plate. It wasn’t serious enough for the Stormbird to withdraw but they’d come about as far as they could without risking a crash.

Vulkan didn’t even reach for a handhold. His body was utterly still, his intensity unbroken.

Slowly, the pilot brought them back on course and the node loomed again, several metres below and wreathed with crackling power. The witch coven at its foundation was ready to siphon its energy into another bolt. The devastation wrought by the first must have been egregious to witness on the ground and from above its destructive trail was all too plain to see.

It seemed strange for the eldar to protect the edifice with such vehemence when their tactics suggested an entirely different method of warfare. Here, by holding onto the obelisk, they exposed all of their weakness and mitigated their strengths. The suspicion of something unseen and unknown entered the primarch’s mind, but for now he could not affect it, whatever it was. Instead, he concentrated on the thing he could do something about.

Vulkan crouched a little lower and waited until the Stormbird banked so the hatch was angled down towards the node. The hammer he bore was a weapon of his own creation. Thunderheadwas its name. He’d fashioned it on Nocturne in honour of N’bel and his heritage. Captured storms thrashed within its ornate head, beaten into the metal through many long hours of toil in the forge. There was no other like it. No Legionary could wield it. No man could even lift it. Vulkan alone possessed the strength and mastery to bend it to his will.

He donned his drake-helm and it mag-locked to his gorget.

“Do you know what comes after lightning, brothers?”

The Pyre Guard did not answer. Instead they readied their weapons.

Vulkan’s eyes flashed with inner fire.

“Thunder…”

He leapt from the hold.

SHRIEKING AIR WHIPPED past Vulkan as he plummeted through the storm-wracked sky. He descended like a hammer-wielding comet, a roar of the firedrakes of Mount Deathfire on his lips. His salamander cloak flapped wildly behind him, as if the spirit of the beast it once belonged to had returned and approved of its master’s exultation.

A grimace formed on his face behind his helmet as the primarch reached terminal velocity. The wind became an ear-piercing whine as he descended through it. Surrounded by the tempest, he had never felt more alive than in that moment. He wondered briefly if Corax and Sanguinius felt the same elation as they soared through the heavens.

As he closed on the obelisk, Vulkan clenched his hammer in both hands and lifted it above his head. At the moment of impact, he smashed the arrowed summit of the obelisk like he was hitting the head of a nail. With a tremor of energy, the psychic node ruptured and shattered. Vulkan didn’t slow but kept driving through the ancient stone, following an almighty crack that spread through the obelisk’s core. Shockwaves throbbed outwards from the breaking stone, chunks of it pummelling the eldar who looked up at the falling rock and wailed from below before being crushed. Each successive energy pulse emitted from the destroyed obelisk jolted the now transfixed coven with greater and greater violence. The eldar witches had made themselves conduits for the psychic power in the node and now they were being fed every last residual trace of it. No mortal creature could withstand such a backlash of energy. Vulkan landed and the earth blasted outwards from his craterous impact. In synchrony with it, the witches died one by one. Their eyes burned and flesh melted until at last their skulls exploded and they collapsed, headless, to the ground.

Dust and fire surrounded the primarch in a churning pall. He was crouched on one knee, his hammer embedded in the earth. He stayed like that for several moments. His armour rose and fell as he breathed. The remains of the node collapsed around him. Great clefts of stone sheared away and broke into fragments. By the time it was done, Vulkan was encircled by a belt of shattered rock. The engraved runes had all been broken and their captured light bled away.