Roboute Guilliman had fought countless wars across the stars.
But never with a weapon like this.
Standing upon the bridge of the Macragge's Honour, his towering frame radiated calm authority. His Observation Haki spread out like an endless tide, sweeping across the void ahead — every hidden fleet movement, every flicker of Warp disturbance laid bare. His mind, already sharpened by centuries of strategic mastery, now processed this battlefield awareness in real time.
The Ultramarine fleet sailed into the heart of the Ultima Segmentum, targeting worlds long thought lost. Unlike Shawn's overwhelming hammer-blow style, Guilliman fought like a surgeon — every strike a precise cut, every maneuver stripping away the enemy's ability to resist.
First Campaign — Veritas Prime
The world was a ruin, its skies thick with the spires of Dark Eldar raiding ships. Guilliman's voice was calm as he addressed his captains:
"They thrive on fear. We will take it from them."
The strike began with pin-point orbital bombardments, guided by Haki-augmented precision — not a wasted shot. Guilliman led the first wave himself, Armament Haki coating his entire body in a seamless, polished sheen of unbreakable defense. His strikes were clean, efficient — each blow a death sentence.
In the heat of battle, his Conqueror's Haki pulsed outward, not in Shawn's explosive, battlefield-devouring fashion, but in sharp, targeted bursts — shattering the will of Dark Eldar squad leaders, breaking the cohesion of their forces without wasting energy.
The Ultramarines fought with renewed zeal, many having had their own Haki awakened by Guilliman through relentless drills and exposure to his indomitable will. The once demoralized regiments of the world's PDF joined the fight, their fear replaced with conviction.
By the battle's end, Veritas Prime was free — its people kneeling as Guilliman addressed them directly:
"Your world is yours again. Defend it as we have defended it this day."
Second Campaign — Caelus Forge
Here, the threat was not raiders but corruption. Chaos cults had infested the forge spires, their influence embedded into the very Mechanicus hierarchy. Guilliman knew this fight would not be won by force alone.
Observation Haki told him the truth — who lied, who hesitated, who feared the light of judgment. His war councils became interrogations, his voice pressing like a blade against the guilty until they broke.
When the fighting came, it was brutal and swift. Haki-coated bolter rounds from Ultramarine veterans tore through traitor tech-priests and daemonically possessed servitors. Guilliman's sword — now carrying the subtle internal-destruction edge Shawn had taught him — could cleave through daemon-forged alloys as though they were parchment.
By the campaign's end, the forges were purged. Their production was pledged not just to the Imperium… but to Shawn's grand crusade.
Guilliman's Reflection
In his private chambers, Guilliman allowed himself a moment to think.
He could feel the power Shawn had awoken in him — a constant fire that never dimmed. Haki was not just a weapon; it was a truth. A bridge between mind, body, and soul.
And though he was a Primarch reborn, he knew the truth:
Shawn's fire burns hotter.
Guilliman respected that — and would use it. His own role was clear: where Shawn shattered the walls, Guilliman would fortify the breach, ensuring nothing could ever rebuild the corruption that had once stood there.