Revenge with the Power of the Final Boss

Mana.
When I reincarnated into this world, I was naturally able to manipulate mana.
It’s true that I was initially confused by the sensation, something I hadn’t experienced in my previous life. However, since I had spent a lot of time alone, I had practiced and researched how to handle mana during that time, so I knew how to apply it to some extent.

“Make the mana solid.”
I infused mana into my fist and solidified it.
For this basic application, simply picturing the image of something solid was enough to harden the mana.

With solidified mana in my fist, I swung it toward the enemy in front of me.
"Die! You bastard!"
My small ten-year-old body would likely make my punch look unthreatening.

I wasn’t sure if my attack would reach that Rupert guy, but I couldn’t just do nothing with him standing there.
"Ugh?!"
In a way, my concerns were unnecessary. Rupert, the writer, who had been hit by my punch, effortlessly rolled and fell to the ground.

“He’s weak.”
I was left dumbfounded at how weak he was.
I had been reincarnated by this person, so I figured he wasn’t just some novelist, but someone with real power.

Yet here he was, appearing with his entire body blurred out, telling me about the world’s crisis... and now, after I hit him with a punch wrapped in mana, he goes down in one blow?
"With all that pomp and circumstance, you really can’t be taken down that easily. I’m going to check your whole body."
There’s an old saying: "Even a stone bridge should be tapped before crossing."

It could just be a show, him pretending to be defeated, trying to mock me by letting me feel victorious and then shouting, “You’ve been tricked!”
"Wait! Please! Reader, hold on!"
Rupert scrambled to get up.
"First, let me explain! Please put your fist down for a moment!"

"Stop pretending to be weak. I’ve heard this place is full of villains, and no living creature can survive here, right? And you’re telling me that you’re not weak, yet you’re still fine in a place where even strong hunters can’t survive? What a load of bullshit, where are you pretending to be weak from?"
I tried to speak calmly, but as I thought about the hell I went through because of that bastard, curses slipped out of my mouth.
Captured by villains, tortured through inhumane experiments, and thrown into this rift to see whether I would live or die... that’s what my current fate had become.

My body was somehow healed, my mind clear, but just looking at the one responsible for throwing me into this hell made my anger surge endlessly.
"I-I swear! I’ll explain everything, just listen for a moment before you swing your fist again!"
I wanted to ignore his words and just swing my fist.

But first, I needed to understand where I was, what the situation was, and why this was happening.
“If I can live, I don’t want to die.”
When my body was destroyed, my mind grew weak, and I just wanted to die without pain. But now that my body had recovered, and my mind was sharp, I was looking for a way to live.

I needed to live to take revenge.
The person in front of me wasn’t the only one I wanted to take revenge on.
"Alright, explain it. Why did you reincarnate me here?"

"It wasn’t my intention."
"Are you messing with me?"
"I swear, it’s true! I’m a victim too! After finishing the novel, suddenly, a transmission came."

"Transmission? What the hell are you talking about?"
Was he trying to claim he was part of some transmission network? I never expected to hear such nonsense from him.
"I swear it’s true! Suddenly, I felt like there was a transmission in my head, and it turns out that the novel I wrote wasn’t my idea. I received the fate of another world that was going to happen, and I mistakenly thought it was my idea, then wrote a diary about the future!"

"So, your novel Academy Hero Biography wasn’t just a novel, but a real event?"
"Yes, that’s correct. I thought I was writing a novel, but in reality, I was just writing down what was actually going to happen, as a kind of prophecy."
It was a strange story indeed.

“So, it’s not just a fictional world, but actually another world?”
If that’s the case, then the world I reincarnated into, [The SSS-Class Heir of National Power], could also be some kind of prophecy, a record of another world’s information.
The title, with the combination of “national power” and “SSS-class,” was clearly designed to grab attention, a typical light novel style web novel. But I remembered reading it somewhat enjoyably.

But could it really be that the story wasn’t fiction, and might actually be about real events that will happen in another world?
"Is the world I reincarnated into the same as this?"
"Yes. While I didn’t receive any transmissions, that's what happened."

"Alright, let’s say it’s not a fictional world but another world. But isn’t there something important? Why did you reincarnate me here? What happened to Yoo-cheon?"
"That’s... First, let’s talk about your friend, Yoo-cheon."
When Rupert said he would talk about Seo-mun Yoo-cheon first, I decided to listen.

It could be an attempt to change the subject, but then it would lead to a conclusion.
This bastard... this bastard was my enemy, with no valid excuse or reason.
“I’ll beat him until he dies.”

I wouldn’t kill him yet, as I needed more information, but I would make sure he experienced the hell I went through.
"Hmm, The Black Serpent That Devours the World was originally the threat to this world. However, now, due to the tremendous efforts of your friend, Seo-mun Yoo-cheon, the situation has changed."
"The situation has changed? What did Yoo-cheon do?"

What could Seo-mun Yoo-cheon, reincarnated like me, have done to make such a change?
"Originally, the time in that world passed more than twice as quickly as in this one. But now, the time in the world where you reincarnated has become faster than that one."
"What did he do, just tell me."

"Yes. He killed Terenity."
"Terenity?"
Terenity was the final boss of [Academy Hero Biography].

Known as the Eternal Dragon, Terenity was a beast that invaded and consumed countless dimensions. It operated similarly to The Black Serpent That Devours the World, using mana to raise humans and strengthen their souls before devouring them.
In the original story, Seo-mun Hyun, the protagonist, couldn’t defeat Terenity with pure strength. He used a special technique that destroyed the essence of Terenity, and through luck, managed to defeat it.
Terenity’s strength was overwhelmingly depicted in the story, and for Seo-mun Hyun to have killed it was like a dinosaur being killed by an ant.

"So Yoo-cheon must have gotten really strong, huh?"
But what did Yoo-cheon do to change the final boss of the world I’m in?
"Yes, that’s right. In Academy Hero Biography, Seo-mun Hyun didn’t completely defeat Terenity. Even though he destroyed its essence, his power wasn’t enough to fully annihilate it, and it was expected to revive over time."

"So, is it a bad ending?"
I didn’t particularly like Seo-mun Hyun, the original protagonist of the work I almost reincarnated into, or the main heroine, Kang Mi-hyun, but hearing that the world I thought would have a happy ending was actually doomed was a strange feeling.
"Yes. That was the case. However, your friend, Seo-mun Yoo-cheon, reincarnated as Seo-mun Cheon. He did come up with a strategy, but he ended up completely killing Terenity with pure skill. And the worlds that Terenity had consumed, though they had no life left, are being restored."

"Impressive. Does this affect me?"
"Yes. After killing Terenity, other monstrous entities, which had been hiding out of fear, started moving to consume the worlds Terenity once devoured. Among them, there are creatures interested in your world, raised by The Black Serpent That Devours the World."
"What kind of creature is that?"

"They call themselves The Fox That Devours Worlds. They’re said to be weaker than The Eternal Dragon, Terenity, but stronger than The Black Serpent That Devours the World."
If the end of this world isn’t stopped, then it’s inevitable that the entire world will perish.
It seemed like the difficulty had just increased.

With the final boss being replaced by an even more dangerous monster, could this world survive?
Following the storyline of [The SSS-Class Heir of National Power], this world likely wouldn’t survive.
"Alright, I get it. So, is there something else you need to tell me?"

"Yes? What do you mean?"
Seeing Rupert trying to change the subject, I nodded.
"It’s confirmed."

This was clearly an attempt to change the subject.
As I prepared to swing my fist, Rupert hurriedly spoke.
"Wait, wait! This... I... Ugh! Damn it, I can't lie! Ah! No! I wasn’t supposed to say it! I can’t deceive you even if I want to!"

Suddenly, Rupert started to self-destruct, and I realized that he wasn’t here by his own will.
He had been forced into this situation with a restriction where he couldn’t lie, and was dragged here against his will.