Reincarnated in DxD With the 100X System

The battlefield hummed with residual energy, the air still thick with magic from my sudden Sacred Gear awakening. Sparks of golden light flickered around me like embers, the sheer force of my mana still distorting the space around me.

The ground remained cracked, proof of my overwhelming power.

Mittelt had barely pushed herself up, coughing, her once-cocky confidence in absolute shambles.

I tilted my head, cracking my neck.

"Still alive?"

She flinched.

I grinned. "Good. Then let's keep going."

She looked up just in time to see me casually lift my hand.

And in a single motion—

A sword materialized mid-air.

At first, it wasn't anything flashy—just a basic longsword, seemingly forged from pure energy. Simple. Elegant.

But the moment it solidified in my grip—

[Ding!] – 100X System Activated

Everything changed.

Mystic engravings spread across the blade like living veins of gold. The sword pulsed once—then twice—before its very existence seemed to refine itself into something absurdly powerful.

The weapon's aura skyrocketed.

Not just a basic weapon.

Not even a rare artifact.

This thing was legendary-tier.

I ran my fingers along the blade, feeling the ridiculous divine energy radiating from it.

"Wait… did I just casually forge Excalibur Lite? Sweet."

Mittelt froze.

She didn't even have time to process the absurdity of what just happened—

Because by the time her brain caught up—

I was already behind her.

Her entire body locked up.

To her, it was as if I had vanished.

A single slash.

Her light spear—erased from existence.

The blade cut through her weapon like mist, as if it had never even been there.

A single chill crawled up her spine.

Her heart pounded.

She staggered back, horrified.

Her instincts screamed at her to run.

But—

Too late.

I moved effortlessly.

A controlled series of strikes, perfectly executed, forcing her back without even touching her.

Mittelt's wings flared desperately, her body reacting on pure survival instinct.

But it wasn't enough.

The final strike came down.

A blinding arc of golden energy carved into the ground beside her, barely missing her neck.

She collapsed onto the pavement, panting, frozen in terror.

Her arrogance? Gone.

Her composure? Shattered.

She had lost. Completely.

And she knew it.

Her throat went dry.

Her pride screamed at her to say something—anything.

But what came out instead—

"P-please!" she gasped, her voice trembling.

"Spare me—I didn't know you were this powerful!"

I tilted my head, gazing down at her with lazy amusement.

"Hmm…" I mused, tapping my chin with my glowing gauntlet.

"What to do, what to do…"

Mittelt gulped.

Oh no. He's enjoying this.

Her wings twitched.

She braced for the worst.

Then—my expression shifted.

Still playful.

But also dead serious.

"You know," I mused, tilting my head, "killing you would be a waste."

Mittelt flinched.

"H-huh?"

I let out a long, exaggerated sigh, shaking my head.

"Man… what a shame."

She tensed.

I gave her a once-over, then smirked.

"You're cute enough to keep around."

Her brain crashed.

"EXCUSE ME?!"

I shrugged.

"How about being my maid instead?"

Mittelt.exe has stopped working.

Her face turned red.

"Y-you're joking!"

I stepped forward, my grin widening.

"Do I look like I'm joking?"

I leaned in slightly, lowering my voice just enough to make her extra flustered.

"Maid uniform and everything. It'll suit your style."

Mittelt's wings twitched violently.

She had expected death.

Maybe torture.

But… this?!

Her pride screamed at her to refuse.

But her instincts—the ones that had just been obliterated—reminded her of reality.

She had no choice.

Her face burning, she gritted her teeth.

"T-that's humiliating!"

I nodded. "Yup."

She growled. "It's degrading!"

I grinned. "Absolutely."

She clenched her fists. "I'd rather—!"

I raised an eyebrow, waiting.

Then—after a long, tense pause…

"…Fine."

She exhaled sharply, looking away.

"I'll serve you—for now! But don't think I'll wear some ridiculous maid outfit!"

I chuckled, twirling my sword before dismissing it with a wave of my hand.

"Oh, you say that now, but just wait."

"You'll warm up to it."

Mittelt crossed her arms, pouting, still flustered.

But there was also… something else in her eyes.

Curiosity.

Intrigue.

She had never met a human like me before.

And she had a feeling—

Things were only going to get weirder from here.

———————————

With Mittelt begrudgingly agreeing to serve me, the tension in the air finally settled.

The park was quiet again, save for the faint hum of power still lingering around me.

Scorched earth.

Shattered pavement.

A defeated Fallen Angel still struggling to process reality.

Man… I really just soloed a supernatural opponent like it was a Tuesday.

I flexed my fingers, the glowing gauntlets of Aetherius pulsing with raw energy.

The divine circuits etched into my arms flickered, shifting as if they were waiting for my next command.

This wasn't just some passive ability.

It was alive.

It was thrumming with power.

It was waiting to be shaped.

And now that the fight was over—

I finally had the chance to analyze what the hell just happened.

The moment I focused—

A flood of knowledge surged through me.

I understood Aetherius now.

Its abilities.

Its potential.

Everything.

『100X Equipment Effect』

Any weapon or armor I forge or enhance gets multiplied in power by 100X (minimum).

A basic iron sword?

➡ Artifact-tier.

A legendary weapon?

➡ Potentially divine-grade or beyond.

Wait—

So I can just casually forge Excalibur Lite whenever I want?

…That's kinda broken.

『Weapon Mastery Assimilation』

If I create it, I instantly master it.

Not just basic handling—

Perfect, absolute combat proficiency.

Even if I've never used a weapon before, the moment I forge one—

I know exactly how to wield it like a pro.

So I could just make a divine spear right now and be a spearmaster?

Hah.

This just keeps getting better.

『Divine Armament Bestowal』

I can enhance weapons for others, and they'll inherit the power boost.

Even a weakling could jump entire power levels just by wielding my reforged weapons.

If I wanted, I could arm an entire faction with broken-tier gear.

I smirked.

So I don't just get OP weapons—

I can make other people OP too.

If I ever put together a team…

They're going to be absolute monsters.

Then—

A dangerous thought hit me.

Sacred Gears could evolve.

The 13 Longinus-class gears were legendary because they had the potential to kill gods and rewrite reality.

But what if Aetherius wasn't even at its final form yet?

With my 100X System, I could already tell—

This thing was absurdly strong.

But what if, over time, it evolved into something even more broken?

Aetherius wasn't just a forge.

It was creation itself.

A forge capable of producing legendary divine weapons, amplifying their power beyond mortal limits, and granting absolute mastery over them?

If this thing kept evolving…

I might end up with something that could match or surpass even the True Longinus.

A slow grin spread across my face.

"So I didn't just hit the jackpot…"

I muttered, staring at the golden circuits glowing along my arms.

"I got the cheat code to DxD's entire power system."

I clenched my fist, feeling the divine hum of Aetherius beneath my skin.

This wasn't just a strong ability.

It was a game-changer.

And now—

It was time to see just how far I could push it.

—————————

I glanced down at my newly awakened Sacred Gear, flexing my fingers as golden energy flickered along the intricate gauntlets of Aetherius.

The sheer power radiating from it still felt surreal—

Like something out of a power fantasy.

Then again…

My entire reincarnation arc was basically a power fantasy at this point.

I chuckled to myself.

"Bought math books, casually beat a Fallen Angel, awakened a god-tier Sacred Gear—productive evening, indeed."

Yeah. Life was good.

But now?

I needed to start planning my next moves.

Because if I kept getting stronger at this rate…

I'd be breaking into the high-tier supernatural rankings way sooner than expected.

Which meant—

I needed to set my next objectives carefully.

『Step 1: Train Further – Master More Math-Based Magic』

If magic = math, then I needed to become the Einstein of sorcery.

I had already proven I could obliterate opponents using calculated spell formulas.

But there was so much more to refine.

The limits of sorcery?

I refused to believe in them.

『Step 2: Enhance & Recruit Allies』

I couldn't solo the entire supernatural world forever—

Not if I wanted to build something bigger.

Aika Kiryuu came to mind.

She was sharp, observant, and already intrigued by the supernatural.

Maybe even other human girls in Kuoh with untapped potential.

And of course—

My newly acquired Fallen Angel maid.

(Who I was totally going to get into a maid uniform, sooner or later.)

『Step 3: Test My Gear's Power – Become an Unstoppable Force』

Aetherius was beyond broken, but I had barely scratched the surface.

If it really had the potential to evolve into a Longinus-class Sacred Gear…

Then I needed to push it to its limits as soon as possible.

Because if I could forge weapons capable of killing gods—

Then the supernatural world was in for a rude awakening.

I turned my gaze toward the skyline of Kuoh Town, the city lights flickering in the distance.

The supernatural scene in this town?

Yeah.

It wasn't ready for me.

A grin stretched across my face, my mind already forming a bigger plan.

"Time to build my team, arm my heroines, and forge my own DxD legend."

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