Chapter 4: The Mob Prince, Slaying a Demon at Age 5
“Guh, guwaaaah! How dare a mere child surpass my power! I won’t stand for it!”
The Archdemon began to unleash a barrage of attack magic.
Not just Fireballs, but lightning strikes and wind blades—magic of every attribute rained down like a torrential storm.
However, the Dark Edge Wall I held up didn’t even tremble, no matter what magic was hurled against it.
“Don’t you bully Onii-samaaa!”
At that moment, a jet-black sphere appeared above Diana’s head.
No, it wasn’t so much a sphere as a bottomless hole torn into the very fabric of space.
“Unique Magic…?”
The Archdemon’s eyes widened. I was surprised too.
That’s Demon Lord Diana’s Unique Magic: Black Moon Swallowing the Heavens.
A cheat magic that absorbs the enemy’s magic like a black hole and converts it into her own Magical Power. Truly a last resort befitting a final boss.
To think she could use Black Moon Swallowing the Heavens from the age of four…
As my little sister, her magical talent is terrifying.
Shwoooooooom!
Diana’s Black Moon Swallowing the Heavens absorbed all the magic the Archdemon unleashed, erasing it completely.
“What are these children?! Could they be Dark Elf royalty? Even so, to this extent…!”
The Archdemon faltered.
Furthermore, the magic circle that had appeared on the ceiling was swallowed by Black Moon Swallowing the Heavens and vanished, causing the barrier surrounding the Prison Tower to lose its effect.
Now I can generate a Dark Edge of a size that exceeds the limit, without being hindered by the barrier.
“Eeeek, it’s hot!”
Diana, having absorbed a massive amount of Magical Power with Black Moon Swallowing the Heavens, flipped over in surprise.
At the same time, the black hole that had appeared above Diana’s head disappeared.
“Thanks, Diana!”
I imagined a sword that could defeat the Archdemon.
It was a gigantic sword. A greatsword that a giant would wield, capable of cleaving this Prison Tower in two.
“You called me an impudent fool for trying to abduct the Dark Elf princess. That’s right!”
Without thinking of the consequences, I concentrated all my Magical Power into both hands.
“I will free Mom and Diana someday!”
“What?! W-what is that power…?”
The Archdemon staggered back in fear.
“Pierce through, Titan’s Sword!”
From my outstretched hands, a greatsword that seemed capable of splitting the heavens—befitting a giant—extended forth. Not only was it gigantic, but it also possessed the characteristics of the sturdy and thick Dark Edge Wall, maximizing its attack power.
It pierced through the Archdemon, bisecting him, and also pierced through the ceiling and walls.
The entire Prison Tower swayed and tilted greatly.
“…Unbelievable! This dark power, who, who in the world are you?!”
The Archdemon crumbled into particles of light and vanished.
“Yay! Onii-sama is strong!”
Diana’s eyes sparkled as she jumped at me.
“Diana, are you hurt? Did you absorb too much Magical Power? Are you experiencing a Magical Runaway?”
“Magical Wunaway? Nope, I’m okay!”
Diana, smiling brightly, didn’t seem to have anything wrong with her.
I breathed a sigh of relief.
Come to think of it, Mom did say that Diana’s Magical Power was average.
Is that why she doesn’t experience a Magical Runaway, even after absorbing magic with Black Moon Swallowing the Heavens?
“Onii-sama, your face looks really pale. Are you okay?”
“Huh? Oh… I feel really drained.”
The Magical Runaway had subsided, but I was in a state of collapse. My strength left me, and I slumped to the ground.
Could it be the backlash from using such reckless magic? It’s like all the heat has drained from my body…
“What was that magic just now…? Could it be, you two did it?!”
At that moment, the warped door of the room was kicked open violently, and a large man burst in.
He had short, golden hair like a lion’s mane, and striking, well-defined features. He was a dignified man with a well-trained body. Over his black attire, he wore a luxurious crimson mantle.
“Hyaa, who’s that…?”
Diana clung to me, frightened.
She seemed to feel an instinctive fear from the man’s aura.
I recognized his face from the game. He’s much younger than I remember, but there’s no mistaking it.
This is our father, Emperor Alvaise.
“That was a magnificent display of magic, I commend you!”