"Your arrogance will be the noose that hangs you, Primarch," the Great Unclean One roared. As he moved, maggots fell from his mouth and crawled on the ground, searching for flesh and blood.
The Nurglings within the daemon also clumsily imitated his roar.
Plaguebearers and Plague Marines emerged from behind the roaring Great Unclean One, reinforcing the enemy's precarious defense line.
Those traitors had almost sacrificed the lives of an entire planet, using the surging warp energy of the dead to tear reality open, creating a warp rift and summoning a vast daemonic army.
"Today you die, daemon. I will have your subordinates take your head back to declare my return to the Chaos God behind you."
Guilliman began to run, his heavy body causing the mold-covered ground to tremble slightly.
The flames rising from the Emperor's Sword in his hand became even more dazzling.
"Protect the Primarch," the veteran of the Honour Guard shouted. They charged forward with Guilliman.
They were fearless, not flinching even when facing daemons.
"Kill him, and offer his soul to the Great Father," Gurlak, holding a rusty plague axe, pointed at the charging Primarch, ordering the cultists and the remaining Plague Marines to attack.
The daemons also cooperated with the traitors to counterattack the Imperial loyalists.
Rust daemons, Blightkings, and many other daemons of Nurgle poured out from the torn wound in reality, like oozing pus.
If left unchecked, this planet would be completely transformed into a daemon world, becoming Nurgle's garden, in a short amount of time.
Guilliman would certainly not let this happen. He would expel this daemon, restore peace to this world, and incinerate the leader of the rebellion in the process.
With a single swing, he cut down the daemon that attempted to attack him, completely burning its soul with his Emperor's Sword.
The Honour Guard gathered around their master, using terrifying firepower to clear out the swarming enemies for the Primarch.
They could not completely kill the daemons, only shatter their physical forms, banishing them back to the warp.
The Great Unclean One looked down, watching the lesser daemons attack Guilliman and his forces, a smile appearing on its face, but it did not act personally.
It was waiting, waiting for the link between the warp and real space to be strengthened. That way, it could unleash the Father's power to the greatest extent, bringing more daemons into the real universe.
"Pin down the other daemons and traitors for me. I will go and kill that damned daemon leader," Guilliman ordered over the vox, commanding the nearby Space Marines to intensify their attacks and tie down the enemy so he could deal with the Great Unclean One and the leader of the traitors.
"Received, my lord. I will attack from the flank. The Titans will crush them," Sicarius replied to his master. They were advancing with the support of Titans and would soon reach the Flesh Tower.
"Received, my lord," Phicris said over the vox.
"Received," the Chief Librarian of the Aurora Chapter also responded to the gene-father's command.
The Aurora Chapter is a successor chapter of the Ultramarines, and they were among the first warriors to respond to the main chapter after the attack on Macragge.
Many Ultramarines successor chapters recruit from Ultramar, and their loyalty to Guilliman is far greater than that of other chapters.
The Imperial loyalists quickly formed a battlefield centered around Guilliman, launching a fierce assault on the daemon and traitor lines.
To Guilliman's right, the Space Marines advanced with the support of two heavy Leman Russ tanks. As one of the oldest heavy tank models in Imperial service, the power of the Leman Russ tank naturally ranks among the best of the Imperial tanks.
They rumbled forward, clearing rubble, leveling the ground, and simultaneously unleashing barrages of bolter fire, shells, and laser beams. The Plague Marines and daemons defending the enemy's left flank fought back desperately.
But their limited numbers could not withstand the terrifying firepower of the Imperial loyalists. Large numbers of enemies were torn apart, limbs blown off, and fell on the battlefield.
To Guilliman's right, two Redeemer Dreadnoughts were advancing, their servo-motors hissing, and their pistons roaring angrily as they moved forward.
The assault cannons in their hands shrieked, spitting streams of fire at the Plague Marines and daemons. The gigantic plasma incinerators became scorching hot with each shot, emitting sizzling steam.
"For the Lord of Ultramar!" the Chief Librarian of the Aurora Chapter, covered by the fierce firepower of the Dreadnoughts, roared. The force staff in his hand crackled, and violent psychic energy emanated from him.
His projection in the warp became increasingly brilliant. Faith gave him strength, allowing him to control even more violent psychic energy.
A scorching flame was unleashed, a psychic shockwave leaping over the ruins. The daemons and traitors in its path were all sent flying, their rotten, disgusting bodies burning with unquenchable psychic flames.
Burning Plague Marines rolled out from behind makeshift barricades, raising their bolters, trying to kill the psyker.
The Chief Librarian used the power of will to grab one, crushing its body and throwing its tattered form at two other burning Plague Marines, knocking them to the ground.
Yet the Plague Marines and daemons did not give up; they attempted to join forces to repel the fierce Imperial assault.
Disease-ridden shells rained down, killing several loyal Imperial warriors and turning them into putrid pus.
Large numbers of daemons chose to possess the Plague Marines, allowing them to use their power and become even stronger.
As both sides fought fiercely, a rumbling sound echoed. An Emperor-class Titan arrived with heavy steps, its plasma cannon like a divine judgment, destroying all enemies in its path.
Even Plague Marines possessed by daemons were no match for the Emperor-class Titan. Those who couldn't dodge in time were directly crushed underfoot.
Like bursting meatballs, they were gone with a 'splat'.
Even if they could dodge, they couldn't escape the Titan's terrifying firepower.
"For the Lord of Ultramar!" Sicarius' voice rang out. They had arrived from the flank, following the Emperor-class Titan.
With the help of many warriors, a breach was opened.
Guilliman's Hand of Dominion smashed the head of a daemon, and then he walked unimpeded towards the Flesh Tower.
"Now it's time to settle our score, daemon."
"You are far more annoying than Mortarion. At least he would listen to the Father, feel the entropy of cosmic life, feel their decay and rebirth," the Great Unclean One picked up the weapon in its hand and likewise strode towards the Primarch.
The Great Unclean One knew very well that only it was qualified to fight a Primarch. Those lesser daemons facing a Primarch were merely delaying tactics, sent to their deaths.
The Great Unclean One attacked first, its weapon slashing at Guilliman, but it was easily parried by the Emperor's Sword in Guilliman's hand.
"Mortarion is a complete idiot. How could he be so stupid as to bow down to you? Look at you. Even siding with the Changer of Ways would be a million times better than siding with your foolish Father. Your Father is weak and powerless, just the worst of the gods."
"I won't fall for your trick. You are trying to provoke me with words," the Great Unclean One said.
"But you didn't deny it, did you? That means you also think your Father is weak and incompetent," Guilliman leaped, slashing at the opponent with his sword, but the Great Unclean One dodged with an agility that didn't match its obese body.
"I didn't," the Great Unclean One said angrily.
"Then why didn't you deny it? Instead, you're fixated on whether I'm trying to provoke you with words. Mortarion is the most useless among us.
My father didn't like him, and the Primarchs hated him because he was too stupid and useless.
He had his power taken away by his subordinates and was even sold to you. Such a foolish thing is unimaginable for other Primarchs, yet your father happily accepted him.
This shows that your father is useless, he prefers to accept the useless, and you are also..."
Guilliman casually mocked, his attacks becoming more and more fierce. The combination of Primarch power and the power of dominion made him incredibly strong.
Even a Great Unclean One, a greater daemon of Nurgle, found it difficult to deal with his attacks.
"A complete and utter waste of a daemon."
"I will kill you!" the Great Unclean One roared, Guilliman's words sending it into a rage.
"But you can't," seeing the Great Unclean One on the verge of losing control from his taunts, Guilliman smiled. "Seeing your foolish appearance, I suddenly don't want to kill you. There are always more daemons, killing you or not killing you makes little difference. I've decided, I will carve the word 'Useless' onto your body, then banish you back, and tell Mortarion for me that I will come find him."