Below is your passage corrected for grammar, spelling, punctuation, and clarity only.
I have not changed the story, tone, or intent, only fixed errors and made it readable and professional for a web novel.
When Ash opened his eyes, he found himself in a pitch-black void. There was nothing else there. He tried moving his body, but it felt as though a mountain was pressing down on him, making him unable to move. He tried calling for help.
"Is someone there?"
All he got in response was silence.
Every second and every minute that passed felt like torment, and after what seemed like an eternity, Ash finally heard a sound.
"Who is there? Wasn't I dead? Why have you brought me here? What do you want?"
Then he heard a very warm and soothing voice. It was as if there was some kind of magic in that voice, making him calm down and relax.
"Before I answer your questions, I need you to answer mine.
What will you do if I give you the power to change your fate? What will you do with that power?
I only want to hear the truth, so think carefully before you answer."
Ash didn't say anything at first. He began to think about how he should answer.
Then he remembered his life—his parents' and sister's faces filled with happy smiles when they spent time together. He remembered Nysa, the girl he once loved, and the day she coldly said, 'Let's break off our engagement and never see each other again.' Then he remembered how the five ruffians killed him on the orders of his cousin.
He remembered all the hardships he had endured in that cruel world because he was weak and incompetent—because he couldn't fight back or take revenge on the people who murdered his family and ruined his life.
As these thoughts flooded his mind, Ash's eyes turned red.
"I want power. I need strength. I want to protect my family and make those bastards pay a heavy price. I will make their lives hell."
"In a world where Transcendental powers are everything, and ordinary people are treated worse than animals, I want to show those who control everything—those sitting on their thrones, living like emperors—"
"What happens when an ordinary person defies their rules, step by step, and takes control of the world from their hands, while they remain powerless to stop it."
"If they like controlling people so much, then I will make them my slaves. I will control their lives and take everything from them."
"I will show them what happens when the order of the world changes. I will create a force far more powerful than any clan or institution."
"I will create a force that rules the world from the shadows."
When Ash realized what he was saying, he was stunned.
Then he heard the voice again.
"Good. Very good. These are your true feelings—the emotions buried deep within your heart. You have always been running away from your true self… but not anymore."
Ash asked, "Now can you answer my question? Who are you, and why are you helping me?"
The voice laughed softly. "You are not yet strong enough to know the truth. When you become stronger, I will give you the answers you seek."
"I will now give you a chance to change your destiny. I will give you the power to protect your loved ones and take your revenge."
After saying this, the voice fell silent.
Then Ash saw a white beam of light enter his mind. Before he could understand what was happening, his head began to feel heavy. He heard the voice whisper,
"I like you, kid, so here's something that will be of great help to you."
After the voice finished speaking, another flash of light appeared before his eyes, and something else entered his mind. He didn't have time to pay attention to any of it.
Then Ash's body began to disappear from the void. Before leaving the pitch-black space, he heard the voice say,
"Remember this—I don't want a weakling. I need you to become a ruthless man, someone who can make their enemies regret being born into this world."
"I want you to make those filthy bastards your slaves and turn their lives into hell."
"I want you to stand at the very top of that world."
"Take care of yourself. We will meet again very soon. Good luck."
When Ash opened his eyes again and looked at his surroundings, he realized he was in his room—the very room where he once lived with his family. He quickly checked the date.
It was one month before the day of the accident.
Ash was so overwhelmed with happiness that he couldn't even speak. His eyes turned red as he picked up the family album beside his bed.
"This time, I won't let anything happen to my family. I still have time to get stronger. I will make those bastards pay a heavy price."
As Ash stood up, intending to go see his parents, he suddenly felt something strange—like a power existing inside his mind.
Just as he was about to investigate it, he saw an ancient, mysterious-looking black book lying quietly within his consciousness.