With Ope Ope no Mi in Marvel (Resident Evil, Marvel, Harry Potter)

"Revenge, revenge, every year so many people die from earthquakes, fires, or wild animal attacks. Why don't you avenge them? All you ever do is focus on demons. Aren't you tired of it? Why can't you just see those deaths as natural disasters?" Muzan yelled as he frantically attacked Daniel Davis, his face contorted with a mix of anger and despair.

Daniel blocked Muzan's attack with his Nichirin Blade, completely speechless at Muzan's shameless, yet somehow self-righteous, reasoning. How twisted did one's logic have to be to equate demons eating people with natural disasters?

If you only looked at Muzan's face, filled with righteous indignation, you might think Daniel was the villain and Muzan the hero.

Daniel knew he wasn't a saint. A true saint wouldn't kill, nor would they use the Philosopher's Stone transmutation circle. The Elric brothers from "Fullmetal Alchemist" refused to use the Philosopher's Stone to restore their bodies, even if it wasn't made by them. But even Daniel couldn't spout such shameless words as Muzan did. In all the villains Daniel had encountered, Muzan was the most shameless. Muzan Kibutsuji's name was actually wrong; it should be Muzan No-Shame.

"How ridiculous. According to your logic, eating people is right," Daniel said, no longer just defending. He swung his Nichirin Blade swiftly, cutting Muzan's eight tentacles into pieces. In an instant, he appeared in front of Muzan and sliced him in half.

"Ah!" Muzan screamed in pain as his body split in two. Tendrils sprouted from his severed body, shooting towards Daniel.

As the Demon King, Muzan could manipulate his body at will, splitting and reassembling it. His regeneration was astonishing, instantly healing his body after being cut.

If the Demon Slayer Corps' pillars faced Muzan, they wouldn't stand a chance even with their marks activated. But Daniel was much stronger than the legendary Yoriichi Tsugikuni.

Muzan's tendrils were all cut off again, and his body was sliced into pieces by Daniel. The dismembered parts quickly reassembled.

"What's this?" Daniel was shocked to see several severe scars on Muzan's body, revealed as his clothes fell apart. These scars would be normal on a regular person, like the Wind Pillar covered in scars, but not on Muzan, the Demon King. Even Upper Moon demons wouldn't have lasting injuries unless they died, let alone Muzan.

"Your body?" Daniel asked, unable to hide his surprise.

Muzan, realizing Daniel's attention, stopped fighting and started shouting.

"They call me a monster, but that guy is the real monster. The wounds he left on me four hundred years ago never healed. Every moment, my body feels like it's burning, tormenting me constantly," Muzan's voice was filled with rage, fear, and a hint of helplessness.

No one would have guessed that Muzan, the Demon King, had been suffering from wounds left by Yoriichi Tsugikuni for four hundred years, causing him constant pain.

"Could it be sword intent?" Muzan's words and his ordeal made Daniel consider a possibility that made his heart race. Since arriving in the One Piece world, he was familiar with the concept of sword intent. The great swordsmen of the sea all mastered this skill.

Sword intent was what allowed swordsmen to cut iron, steel, and even diamonds. It was what set swordsmen apart from those who wielded other weapons.

Sword intent had effects similar to Armament Haki and Conqueror's Haki, enhancing attacks. Unique sword intents could even create special effects, like Vista's cherry blossom petals.

If it were just sword intent, Daniel wouldn't be so alarmed. Sword intent varied in strength, just as not everyone with Armament Haki was invincible. The key was the incredible endurance of Yoriichi's sword intent, still affecting Muzan four hundred years later.

This meant Yoriichi's sword intent was terrifyingly powerful, stronger than even the world's greatest swordsman, Dracule Mihawk, could achieve. Mihawk couldn't leave sword intent in a target for four hundred years despite all efforts to dispel it.

If Yoriichi could travel across worlds like Daniel, Mihawk's title might not be secure.

"No wonder Muzan fears Yoriichi so much. This is indeed terrifying," Daniel thought, understanding why Muzan was so cowardly. Anyone tormented for four hundred years by wounds that nearly killed them would be terrified.

Compared to Moria, who became depressed after being defeated by Kaido, Muzan had suffered far more. He had been tormented for four centuries.

This title of the most cowardly boss in history wasn't entirely Muzan's fault.

"Yoriichi Tsugikuni, you were truly a child of destiny," Daniel thought, considering Yoriichi's life. He had obtained the Breath of the Sun and knew its difficulty. Despite being much stronger than Yoriichi, Daniel found it hard to master.

Perhaps the Breath of the Sun was meant for this chosen one. Tanjiro, who also learned it, couldn't match Yoriichi's power.

No wonder Muzan called Yoriichi a monster.

"Regardless of what you say, the conflict between the Demon Slayer Corps and demons ends today," Daniel declared, raising his Nichirin Blade to decapitate Muzan. Muzan, caught off guard, looked shocked as his head was severed.

As his head fell, Muzan's body began to disintegrate. Even the Demon King shared the demons' weakness of dying from decapitation.

"Don't disappoint me now," Daniel said, wanting to see if Muzan could overcome this weakness. If he did, Daniel would use the transmutation circle.

Daniel had discovered that Akaza's Philosopher's Stone was of the highest quality after he overcame decapitation. Knowing this, Daniel regretted killing Kokushibo too quickly.

True to his nature, Muzan's strong will to survive stopped his body from disintegrating. A new head slowly grew from his neck.

"Hahaha!" Muzan laughed maniacally. "I did it!" He was ecstatic, having overcome one of the two major weaknesses of demons, and his power had increased.

With his enhanced power, Muzan attacked Daniel again, now with ten tendrils moving twice as fast.

"Room, Slaughterhouse," Daniel activated his Ope Ope no Mi power. He had initially wanted to torment Muzan, but knowing he had been suffering from Yoriichi's sword intent for centuries made him lose interest.

It was time to end this and resolve the demon problem once and for all.

"You..." Muzan's dismembered head showed confusion. This power, similar to a Blood Demon Art, stunned him.

In Muzan's mind, Daniel's Ope Ope no Mi power was like a Blood Demon Art.

"Who are you?"

"Who am I? Do you remember the doctor who treated you long ago? That was me. I wanted to see how far my experiment could go, but one Yoriichi made you hide for so long. How disappointing."

"Impossible, I killed him."

"Killed me? That's just what you thought. Do you think an ordinary doctor could create someone like you? Thanks to you, my experiment succeeded. Like you, I couldn't face the sun, but my research over the years broke that limitation. Now, if I kill you, the Demon King, I can live like a normal person. You shielded me from Yoriichi back then, nearly dying at his hands."

"Alright, you know everything now. Thanks to me, you lived an extra thousand years. Be satisfied."

Daniel sealed Muzan's mouth, not giving him a chance to die peacefully.

"Die content? Never." Since he couldn't torment Muzan physically, he aimed to break him mentally. Pretending to be the doctor who made Muzan felt like the perfect blow to Muzan's ego.

"DNA, proteins, enzymes... his blood is amazing. If pushed to the limit, it's more terrifying than a bio-virus."

A bio-virus created mindless zombies, but Muzan's blood created intelligent, man-eating demons.

"Thank goodness demons didn't spread across this world."

A week later, Daniel finally breathed a sigh of relief, finishing his sleepless research. With the Ope Ope no Mi's help, he fully analyzed Muzan's blood, capable of creating demons or becoming the Demon King himself.

He then destroyed all of Muzan's blood. His research was for knowledge, not to create another Demon King.

"Being the Demon King for a thousand years, this Philosopher's Stone is larger than all six Upper Moons combined. How many people did this guy eat over a thousand years?"

The chain reaction of Muzan's death caused all demons under his control to die instantly.

"There shouldn't be any demons left in this world... except for two."

Daniel remembered Tamayo and Yushiro. "Should I kill them? No, I'll leave it to Kagaya Ubuyashiki. He knows Tamayo."

At the Demon Slayer Corps headquarters, the nine pillars gathered.

"What's the situation?" The Wind Pillar was anxious, while the others remained calm.

After Daniel and Muzan disappeared, Kagaya Ubuyashiki realized a flaw in his plan. Muzan's ability to vanish made it impossible for the Demon Slayer Corps to surround and kill him.

Kagaya called the nine pillars together, explaining everything. They waited at headquarters, with the intelligence team and Kasugai Crows collecting information to support Daniel.

During Daniel's week of research, the high-ranking members of the Demon Slayer Corps were anxious, each day feeling like an eternity, fearing Muzan would hide again.

"Master, we have news!" A member of the hidden squad hurriedly approached Kagaya Ubuyashiki, holding a bamboo tube in his hands.

The Wind Pillar, filled with anxiety, rushed forward and grabbed the bamboo tube, opening it without regard for protocol. Inside, he found a slip of paper, and his body went rigid as he read it.

"What is it?" Serpent Pillar immediately asked. He was deeply grateful to Daniel for solving his biggest problem and was thus very concerned about his safety.

"Muzan Kibutsuji is dead," the Wind Pillar finally managed to say, still in disbelief. His voice carried a mix of shock and regret.

"What?" The paper circulated among the nine pillars, each of them reading Daniel's message with a mixture of astonishment and skepticism.

"Master, we have an urgent message from Fujikasane Mountain," another hidden squad member arrived, holding another bamboo tube.

This time, the paper quickly made its way to Kagaya's wife, Amane.

"All the demons in Fujikasane Mountain have disappeared," Amane announced after reading the message.

"It seems we really have succeeded," Kagaya Ubuyashiki said, his voice filled with relief and a sense of closure.

The headquarters of the Demon Slayer Corps was abuzz with the news. The long struggle against the demons, which had spanned centuries, seemed to have reached a decisive conclusion.

Meanwhile, Daniel Davis finished his research and destruction of Muzan's blood. He knew that with Muzan's death, a significant chapter had closed.

"The Philosopher's Stone created from Muzan is massive," Daniel noted, holding the glowing stone. "It's a testament to how many lives he took over the centuries."

With the threat of Muzan eliminated, Daniel felt a weight lift from his shoulders. He had fulfilled his duty, not just to the Demon Slayer Corps but to all the lives affected by the demonic scourge.

However, there were still loose ends. Daniel recalled Tamayo and Yushiro, the two demons who had sought redemption. He decided it was best to leave their fate in the hands of Kagaya Ubuyashiki.

At the Demon Slayer Corps headquarters, the nine pillars and Kagaya Ubuyashiki gathered to discuss the future.

"With Muzan gone, the remaining demons should be dealt with. Tamayo and Yushiro can be exceptions, given their stance against Muzan," Kagaya said, looking around at the pillars.

The Wind Pillar, still coming to terms with the news, asked, "What about Daniel? What will happen to him now?"

Kagaya smiled gently. "Daniel has done more than enough. It's time for him to decide his own path. But first, let's ensure the safety and future of our world."

As the sun rose, a new dawn broke for the Demon Slayer Corps. The battle against the demons had been long and arduous, but they had prevailed. Daniel Davis had been a pivotal part of this victory, and his actions would be remembered for generations to come.

Daniel, having fulfilled his mission, looked towards the horizon. There were always new challenges, new worlds, and new adventures. He took a deep breath, ready for whatever came next, knowing that he had made a lasting impact in this world.

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