Already, the breach Pyriel had psychically perceived was closing.

‘Maintain positions!’ roared Mannheim, as his men were being taken. ‘Keep firing!’

Secessionist fire, freed up from mitigating the Imperial artillery barrage, was levelled at the Phalanx. Mannheim took a lucky las-round in the throat and was silenced.

Tsu’gan watched the officer fall just as Pyriel burst into violent conflagration. Running over to Mannheim, he scooped the fallen captain up into his arms, and watched as a bolt of flame lashed out from Pyriel’s refulgent form. It surged through the void shield, past the unseen breach, reaching out for the minds of the Librarian’s enemies…

Deep in Aphium rebel territory, in an armoured bunker sunk partially beneath the earth, a cadre of psykers sat in a circle, their consciousnesses locked, their will combined to throw a veil across the void shield that kept out the deeds of their ancestors. It was only around Hell Night when the blood storm wracked the heavens and brought about an awakening for vengeance, a desire for retribution, that their skills were needed.

One by one they screamed, an orange fire unseen by mortal eyes ravaging them with its scorching tendrils. Flesh melted, eyes ran like wax under a hot lamp, and one by one the psyker cadre burned. The heat inside the bunker was intense, though the temperature gauge suggested a cool night, and within seconds the psykers were reduced to ash and the defence of Aphium with it.

Upon the killing field, Tsu’gan detected a change in the air. The oppressive weight that had dogged them since mustering out for a second time on Hell Night had lifted, like leaden chains being dragged away by unseen hands.

Like mist before the rays of a hot sun, the warp echoes receded into nothing. Silence drifted over the killing field, as all of the guns stopped. The void shield flickered and died a moment later, the absence of its droning hum replaced by screaming from within the city of Aphium.

‘In Vulkan’s name…’ Tsu’gan breathed, unable to believe what was unfolding before his eyes. He didn’t need to see it to know the spectres had turned on the rebels of Aphium and were systematically slaying each and every one.

It wasn’t over. Not yet. Pyriel blazed like an incendiary about to explode. The Librarian’s body was spasming uncontrollably as he fought to marshal the forces he’d unleashed. Raging psychic flame coursed through him. As if taking hold of an accelerant, it burned mercilessly. Several troopers were consumed by it, the mind-fire becoming real. Men collapsed in the heat, their bodies rendered to ash.

‘Pyriel!’ cried Tsu’gan. Cradling Captain Mann-heim in his arms, he raised his bolter one-handed.

…you know what you must do.

He fired into Pyriel’s back, an expert shot that punctured the Librarian’s lung but wasn’t fatal. Pyriel bucked against the blow, the flames around him dwindling, and sagged to his knees. Then he fell onto his side, unconscious, and the conflagration was over.