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I Am Roboute Guilliman! (Warhammer 40K Self-Insert)

In the grim darkness of the far future, there is only war. An ordinary soul, within the physique of a demi-god. A mortal, yet not. In his hands, he holds a unique system, a collection of advanced and unheard-of inventions and tools, able to reshape the very basis of the Imperium, pushing it beyond its current, crippling standstill. Can he, Roboute Guilliman, wrest the fate of the Imperium from the claws of extinction? (SI reborn as Roboute Guilliman, but with a tech system. He has all the memories of Roboute Guilliman, and acts like Roboute Guilliman, but has the knowledge of the plot of Warhammer 40k) From: https://www.69shu.com/txt/45175.htm

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25 Chs

Chapter 16

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They would cleanse every planet in Ultramar, then radiate to other territories of the Imperium, save humanity that is continually sliding towards the abyss, and prevent the fate of the extinction of the Human Imperium.

Countless engines of war were activated amidst the prayers of the Tech-Priests, leaving the starports with massive trails of fire, sailing towards the starry void.

One after another, the ships' Gellar fields were activated, bathing the massive hulls in a faint glow.

The Gellar field is one of the crucial technologies enabling humanity to traverse the warp.

The field effectively prevents the ships of the Imperium from being corroded by the warp, and wards off the unliving entities hidden beneath the warp's waves from attacking the ships.

The awakening of Guilliman and his ferocious declaration of war had already caught the attention of the gods.

A Primarch daring to declare war on them was an unforgivable crime.

Their response was equally simple and brutal.

The warp boiled due to the gods' rage, the tumultuous Warp stirring up a storm akin to terrifying waves.

The warp tides roiled, roaring, and the storm of destruction continuously assaulted them.

"Arrogance takes the form of a swirling vortex. Rage and desire merge into a raging storm, while despair transforms into steep straits, atop whose cliffs dwell countless ravenous demons.

They await any opportunity for the Imperium's vessels to expose any vulnerabilities, poised to launch their attacks.

Navigators, shackled and immersed in nutrient fluid, have their arms and heads connected to the ship's mechanical apparatus by cables.

They strive to utilize their third eye to perceive the course of the aetheric currents, guiding the ship's voyage.

Navigators are unique beings with a history spanning tens of thousands of years.

With humanity stepping into the stars and initially colonizing the galaxies, Navigators appeared in the human world.

In the golden age, when humans first encountered the warp, a subtle genetic mutation occurred in some of them.

These individuals were extremely sensitive to the energy flows of the Warp and could provide effective guidance and navigation during warp travel.

After alterations and optimization, these individuals became Navigators.

Navigators have a third eye, either as a result of tech-priest enhancements or a natural mutation.

This third eye can observe the flow of aetheric energy in the Warp, discern direction, and most importantly, see the glow of the Astronomican.

The Astronomican is an important beacon for Imperial warp navigation, constructed by the Emperor during the Great Crusade, and currently maintained by the Adeptus Astronomica.

The fleet's journey is perilous. Despite being prepared, Guilliman felt apprehensive when faced directly with the warp storms.

The Astronomican's light is barely visible, having become incredibly faint, and Navigators must expend greater effort to identify the course.

Imperial vessels can no longer linger in the Warp as they used to and must exit the Warp periodically.

Thanks to the maintenance by tech-priests, the Gellar Fields of every ship in the fleet are functioning normally.

Without these fields, humans would be like lambs to the slaughter in the Warp.

"It seems we must find a way to calm these warp storms," Guilliman said, looking at the data slate in his hand. His eyebrows furrowed, the warp storm was more severe than he had imagined.

Either find a way to quell the warp storms or enhance the resistance of the Imperial vessels against them.

If neither can be achieved, retaliation against the gods would be a joke.

Demons and traitors are unaffected by the warp storms, while the Imperium of Man struggles to move. It is easy to imagine how difficult victory will be for the Imperium.

Guilliman pondered on where he could find something or some technology to address this matter of navigation, ensuring that the Imperial fleet arrives at its destination precisely and without error.

Footsteps echoed as a young man in a long robe, his eyes completely white, entered the primarch's chamber.

"Sir."

The young man, though blind, was able to locate Guilliman with ease and bowed respectfully."

"Rosan, what brings you here?" Guilliman interrupted his contemplation, raising his head to look at the young man who entered.

He didn't mind the other's white pupils; such blindness was not uncommon. The eyes of the Astropaths were mostly like this. In simple terms, they were all blind, but they had the eye of the mind, which could replace the function of the physical eyes.

The Imperium's faster-than-light travel relied on the Warp. Naturally, faster-than-light communication between the stars depended on the Warp as well. The distances between galaxies were too vast, spanning tens or hundreds of light-years. Conventional communication was seriously delayed and could not meet the needs of the Imperium. Warp communication was a necessity.

Astropaths played a crucial role in the Imperium's ability to use the Warp to transmit messages. Each sector, sub-sector, and region would establish an Astropathic fortress to collect and relay information.

Astropaths would convert their intended messages into thoughts and dreams, then use their psychic abilities to send them into the Warp, crossing the galaxy to other Astropaths. The communication between Astropaths was not in words, but thoughts and dreams.

The receiving Astropath needed to describe all aspects of the dream, then analyze it to extract the information. To enhance this transmission and ensure it was not tampered with by certain Warp entities, Astropathic choirs were often formed to amplify the transmission power, ensuring that the Imperium could receive their messages.

All Astropathic fortresses and active Astropaths aboard various fleets fell under the control of the Astra Telepathica on Terra, which regularly replenished the number of Astropaths at each fortress.

All Astropaths would undergo a special process to shape their abilities, the soul-binding ritual. Periodically, the Astra Telepathica would send screened psykers to the Imperial Palace.

These psykers would be purified by the Emperor's power, enabling them to maintain their sanity under the scrutiny and whispers of Warp daemons, without becoming corrupted or devoured.

But the soul-binding ceremony also carried risks. Due to the Emperor's powerful will and psychic energy, ordinary psykers could not directly perceive His presence in the Warp, often leading to damage to their visual organs, resulting in blindness.

In more tragic cases, they would lose their sense of smell and hearing. Rosan was fortunate; he had only lost his sight.

"New information, my lord. A distress call from the Sarum system. The forces of Chaos are still ravaging there. The local defenders claim they are under attack from Plague Marines."

"Plague Marines?" Guilliman frowned slightly, but soon relaxed and made arrangements. "Let the fleet continue towards the industrial system of Konor. I will lead a small force to deal with this situation."

"My lord, is this not somewhat unwise? You should not risk yourself in this manner. Perhaps you could assign a few captains to handle this matter instead," Rosan said, attempting to dissuade Guilliman from going personally and suggesting the task be delegated to others.

"There is no place that is absolutely safe; danger is what a Primarch must face. I need some victories to stabilize the hearts of the Imperium's citizens. Even a trivial victory will be interpreted by those who yearn for it as a sign of the Imperium's counterattack, and the failure of Chaos. Do you understand, Rosan? They are too afraid. They need victory for comfort and to boost their confidence," Guilliman, smiling, replied to Rosan, who stood before him.

"But I still don't think it's a good idea. You're too important. If anything were to happen to you, who would guide the Imperium?"

"I am not a figurehead; I am a Primarch, a Primarch with powerful abilities. I was created to help the Imperium achieve victories in countless wars, not to be placed on a shelf as a mascot. Our conversation ends here. I hope you return to your post and continue collecting information from the Warp. I look forward to your next report."

"Rosan obeys your orders, my lord."

"Very well, off you go. And let Sicarius enter from the door; I have something to say to him."

Rosan saluted once more and stepped out. He understood that once a Primarch made a decision, it was unshakeable. He could suggest, but that was all. The authority of a Primarch could not be swayed. Upon hearing Guilliman's words, Rosan obediently stepped out and allowed Sicarius to enter and find the Primarch.