I Reincarnated as a Mob Villain Prince Who Dies Before the Game Starts ~ In Order to Be Happy with My Favorite Heroine's Younger Sister, I Overcame My Weakest Magic [Dark Blade] with Excessive Effort, and It Became the Strongest Broken Power ~ - Chapter 4: The Mob Prince, 5 Years Old, Slays a Demon

Chapter 4: The Mob Prince, 5 Years Old, Slays a Demon

“Y-you brat! A mere child surpassing my power, this cannot be!”

The Archdemon started shooting off attack magic.

Not just fireballs, but lightning and wind blades, and every kind of magic fell down like a torrential downpour.

But the Dark Edge Wall I raised, [Dark Blade Wall], didn’t shake at all, no matter what magic was thrown at it.

“Stop bullying my big brother!!”

At that moment, a black ball appeared above Diana’s head.

No, it wasn’t exactly a ball—it was more like a bottomless hole in the air.

“Unique magic…!?”

The Archdemon widened its eyes. I was surprised too.

This was the unique magic of Demon Lord Diana, [The Black Moon That Swallows the Sky], Ginnungagap.

It was a cheat magic, like a black hole that absorbed the enemy’s magic and turned it into her own mana. Truly a last resort move for a final boss.

I never expected that Diana could use [The Black Moon That Swallows the Sky] Ginnungagap at just 4 years old…

Even as my sister, her magical talent is terrifying.

Swooooshhh!!

Diana’s [The Black Moon That Swallows the Sky] Ginnungagap sucked up and erased all the magic the Archdemon shot.

“What… are these children!? Could they really be royalty of the Dark Elves? But even so, how is this possible…!?”

The Archdemon became flustered.

Furthermore, the magic circle that appeared on the ceiling was swallowed up by [The Black Moon That Swallows the Sky] Ginnungagap and disappeared, making the prison’s barrier lose its power.

Now, without the barrier in the way, I can create a Dark Edge that exceeds its limit.

“Hot!!”

After absorbing so much mana with [The Black Moon That Swallows the Sky] Ginnungagap, Diana flipped over in surprise.

At the same time, the black hole above Diana’s head disappeared.

“Thanks, Diana!”

I imagined the sword that would defeat the Archdemon.

It was a huge sword. A giant sword, the kind a giant would wield, capable of cutting through this prison tower.

“You called me a miscreant trying to take away the princess of the Dark Elves? That’s right!”

I focused all the mana I could into both of my hands, without thinking ahead.

“I will free Mom and Diana someday!”

“Whaaat!? W-what is that power…!?”

The Archdemon stepped back in fear.

“Pierce through! [Giant Sword] Titans’ Sword!”

From both of my outstretched hands, a giant sword appeared, as if it were splitting the heavens. Not just huge, but also reinforced with the properties of the Dark Blade Wall, making its attack power reach its extreme.

It pierced the Archdemon, splitting it in half, and tore through the ceiling and walls.

The whole prison tower shook violently and tilted.

“…I can’t believe it! This dark power… who are you!?”

The Archdemon disintegrated into light particles.

“Yay! Big brother, you’re so strong!”

Diana’s eyes sparkled as she jumped at me.

“Diana, are you okay? You absorbed so much mana, are you sure there was no mana overload!?”

“Mana overload? I’m fine!”

Diana smiled happily, and there was no sign of any problems.

I sighed in relief.

Now that I think about it, Mom said that Diana’s mana was like that of an ordinary person.

Maybe that’s why she didn’t have a mana overload even after absorbing magic with [The Black Moon That Swallows the Sky] Ginnungagap?

“Big brother, you look so pale. Are you okay?”

“Huh? Ah… I feel really sluggish.”

Although the mana overload had settled, I ended up in a state of exhaustion. I collapsed, my strength drained from me.

Could it be the backlash from using such intense magic? It feels like all the heat has drained out of my body…

“What was that magic…!? Could it have been you two!?”

At that moment, the distorted door of the room was kicked open violently, and a large man jumped inside.

With short, golden hair like a lion’s mane, a fierce yet handsome face, and a body that exuded strength, he was an imposing man. He wore a luxurious crimson cloak over his black outfit.

“Who…?” Diana clung to me in fear.

She must have felt an instinctive fear from the pressure the man gave off.

The man’s face was one I recognized from a game. He looked much younger than I remembered, but there was no mistake.

This man is our father, Emperor Alvais.

“That was magnificent magic. I commend you!”