They won the Holy Grail War, but this turned out to be the Virtual Tree Universe.

Chapter 36 Draining the Ghost King
Muzan Kibutsuji realized that he had underestimated the Demon Slayer Corps. Since Yoriichi Tsugikuni, he had once again felt the threat of death.

Having his head severed is not a major injury to Muzan Kibutsuji, who has five brains and seven hearts; he can simply self-destruct and have another head grow back.

The problem is the medication that Tamayo injected him with.

Just like in the original story, Tamayo injected Muzan Kibutsuji with four different drugs: one to restore him to human form, one to age him by fifty years in a minute, one to stop him from splitting, and one to destroy his demon cells.

Unlike the original story where Muzan Kibutsuji was able to slowly break down the medicine Tamayo injected into him within the Infinity Castle, this time he simply didn't have time to break down the medicine.

Although no one in the Demon Slayer Corps researched the Crimson Blade this time, nor did anyone activate the so-called Transparent World or Demon Slayer Marks, the power of the Hunting Destiny was enough to bridge the gap between humans and demons.

Moreover, Muzan Kibutsuji also had to face an attack from a legitimate Heroic Spirit, Kojiro Sasaki.

Just as Dan Lei predicted, Sasaki Kojiro really didn't have a good way to deal with Kibutsuji Muzan's immortal body.

Without any Noble Phantasms or weapons specifically designed to counter immortality, Sasaki Koji can instantly regenerate no matter how many times he cuts Muzan Kibutsuji.

The medicine that destroys demon cells is less effective under the influence of Abundant Fate, and Muzan Kibutsuji's regenerative abilities are hardly affected.

However, it was wishful thinking for Kibutsuji Muzan to defeat Sasaki Kojiro in a short time; no matter how fast he swung the nine whips on his back and the eight whips on his legs, it would be useless.

Sasaki Kojiro wasn't just limited to the Swallow Return move; he had perfected the Goichi-ichi technique of the Rock Flow Sword Style, and every time he swung his sword, Kibutsuji Muzan would have something cut off, and his pipe whip could cut off as many as it came.

Muzan Kibutsuji was too arrogant. His use of the Abundant Fate Power was quite rudimentary; he only knew how to increase his own regenerative abilities but did not know how to use it to protect himself.

As time went on, the medicine that Tamayo had given Muzan Kibutsuji continued to take effect, and Muzan Kibutsuji could clearly feel his power constantly draining away.

It can only be said that even ghosts, a species that leans towards the dead, age.

This is somewhat counterintuitive, because in normal understanding, the older the Dead Apostle, the stronger they are in combat.

But in reality, the reason why older Dead Apostles are stronger is because of the accumulation of energy over time. In order to survive, they will constantly absorb energy from the outside world, and naturally become stronger over time.

If you change the way an ordinary Dead Apostle lives, let him sleep for thousands of years, and see if his fighting power becomes stronger or weaker when he wakes up.

After all, not all Dead Apostles are True Ancestors.

Currently, Muzan Kibutsuji continues to age without any accumulation of life, meaning the human-transforming drug has little effect on him; otherwise, Muzan Kibutsuji, who would have turned back into a human, would have become a withered old man.

Of course, as time went on, the first to give in were Gyomei Himejima and Sanemi Shinazugawa, both pure-blooded humans.

Even though the hunting fate helped offset some of the physical differences, people get tired. In this battle, Himejima Gyomei and Shinazugawa Sanemi could only barely defend themselves and hold the line. Facing the seemingly invincible Muzan Kibutsuji, the two of them were practically slashing at Muzan until their hands were sore.

At this moment, Dan Lei was observing the entire battle situation on the mountain from a cave in the mountains where the Demon Slayer Corps headquarters was located.

Because they had complete advantage in terms of location and manpower, and with puppets used as cannon fodder, many members of the Demon Slayer Corps were injured, but very few died.

On the other hand, all demons below the Upper Moon who entered the mountains were wiped out. Currently, apart from Kokushibo and Akaza who are still putting up a last-ditch resistance, all the other Upper Moons have been defeated.

Seeing that it was almost time, Dan Lei felt he should focus on dealing with Kibutsuji Muzan.

So, Dan Lei telepathically informed Sasaki Kojiro, saying, "It's almost time. Execute Plan B. Lure Kibutsuji Muzan to the prepared place. I've already replaced the Blue Spider Lily there."

After receiving Dan Lei's message, Sasaki Kojiro and the other two immediately felt something inside their clothes.

So, he leaped away from Muzan Kibutsuji and deliberately took out the blue spider lily from his clothes.

This blue spider lily is real. Muzan Kibutsuji only glanced at it, but his body's instinctive desire confirmed that the flower was definitely not fake.

So Muzan Kibutsuji instantly roared at Kojiro Sasaki.

Give me the flowers you're holding!

With that, he unleashed the Blood Demon Art Black Blood Thorn, drawing blood from his own body and transforming it into a dense thicket of thorns that surged toward Sasaki Kojiro.

However, Sasaki Kojiro possessed A+ agility and was determined to escape. He dodged out of Black Blood Thorn's attack range in a flash.

After Muzan Kibutsuji saw the real blue spider lily, his physical desires had long since overwhelmed his reason. Unlike Kojiro Sasaki, who suddenly ran away after a good fight, Muzan Kibutsuji chased after it with all his might.

Gyomei Himejima and Sanemi Shinazugawa knew that Danlei had a plan to lure Muzan Kibutsuji after they had worn him down for a while, but they did not expect Kojiro Sasaki and Muzan Kibutsuji to be so fast. In the blink of an eye, the two disappeared.

Fortunately, Danlei immediately swapped them out, sending them to the battlefield of Kokushibo and Akaza to eliminate them as soon as possible, since Danlei wouldn't have the energy to continue supporting the Demon Slayer Corps.

Soon, Sasaki Kojiro led Kibutsuji Muzan deep into a cave, where one of Dan Lei's magical projections was located.

Upon seeing "Dan Lei", he threw the blue spider lily at "Dan Lei" and then instantly vanished in spirit form.

The blue spider lily was naturally replaced by Dan Lei, and when Kibutsuji Muzan entered, he only saw one person, and his perception of the flower was instantly cut off.

Without the allure of the blue spider lily, Muzan Kibutsuji's intelligence finally returned. He looked at the "Danlei" before him and asked...

"You lured me here with the blue spider lily, so you're the one who used the Demon Slayer Corps to set this trap, aren't you? Judging by your clothes, you're not a local. What grudge do we have that you're so determined to kill me?"

In response to Muzan Kibutsuji's question, Dan Lei used a magic projection to answer.
"Nature is a bountiful evil, and everyone has the right to kill it."

"And I'm very curious about what a thousand-year-old immortal could cultivate after draining their magic power."

After he finished speaking, the walls of the entire cave suddenly lit up. Only then did Muzan Kibutsuji realize that the cave was not surrounded by rock walls, but a base built with silver as its foundation.

At this moment, countless golden threads, along with gemstones, traced countless mysterious lines on the silver base. Then, Muzan Kibutsuji suddenly felt his hands and legs go weak, and his body collapsed to the ground.

Dan Lei's magic base, which was purchased with a large amount of silver, gold, and gems, has only one effect: the life force conversion array, which is commonplace in the Type-Moon magic world.

This kind of array, even a simple one, can be released by Medusa when Rider descends (the barrier released at the school in the TV series).

The more advanced method is the one that Medea's real Master, Atram Gariasta, showed to Medea, which involves directly using humans to refine magic crystals.

Now, Dan Lei is using this technique directly on Muzan Kibutsuji, wanting to see what he can create with his thousand-year lifespan.

(End of this chapter)