The Daily Life of the Inventor in Another World

Serafall wore a satisfied smile. She was deeply grateful that Marcus, not some reckless brat like the current Red Dragon Emperor, had inherited Solomon's legacy.

Whenever she wasn't spending time with Marcus or Sona, she found herself watching the Red Dragon Emperor. He was third on her list of curiosities—not because she was particularly interested in him, but because she wanted to see to whom he would ultimately belong. It could be her sister, though she doubted it, or perhaps Sir-chan's baby sister, which seemed more likely.

Had she not met Marcus, Serafall might have been inclined to recruit the brat into So-tan's peerage. She was confident that So-tan could "re-educate" him. But now? The Red Dragon Emperor had lost any real appeal beyond her passing curiosity. Even if his gear had been properly maintained, it didn't compare to what her beloved Master was capable of.

In just one day, Marcus had designed a weapon at the super-devil level. While it was true that some of the necessary technology had taken time to develop, the weapon itself had been completed in mere hours.

Impressive? Yes. Terrifying? Definitely. But what truly delighted her about her current situation was the way Marcus, despite being a teen and despite her offering herself as a "snack," had merely pulled her into bed, held her as a hug pillow, and called it a day. It was the greatest "loss" of her life—not in terms of battle or power, but in her devilish charm and seductiveness. Yet, even after such a humbling experience, she found herself desiring his company even more. She had most likely fallen even deeper in love with him.

Her new approach toward Marcus had, indeed, worked. Despite having to answer a series of probing questions—his keen observation had instantly detected her change in demeanor—Serafall understood that if she wanted Marcus's help, she had to prioritize his needs. By doing so, she had gained his favor. It was a reminder that her Master was not easily swayed by her charms.

It was strange that this advice came from Grayfia of all people—once a figure Serafall had dismissed as little more than a cold, emotionless cube of ice.

When Marcus finished his new rifles, he was eager to test them at full capacity. The problem? The sheer power of their blasts made it impossible to test them anywhere near his garage—or even within his home country.

Each shot was powerful enough to generate a blast akin to a hydrogen bomb.

This meant he needed a remote location where he could test the rifles without attracting the attention of outsiders.

Initially, Marcus had planned to go to the South Pole, but Serafall proposed a better solution: creating a dimension. While the rating games often created dimensions for devils to observe, in this case, Marcus had two of the strongest female devils at his side. So, crafting a testing space was no longer an issue. The real concern was whether the dimension could withstand the explosions.

After considering the problem, Marcus devised a solution: the Diamond Core Heart. Several of them, in fact. One to stabilize the dimension, another for the ground, and a third for the barriers.

"You know..." Serafall gulped nervously as she saw the three Diamond Core Hearts Marcus pulled from his inventory ring. "One can protect a Pantheon... and you've pulled out three. Do you realize that's like using a hammer to kill an ant?" The Leviathan's forehead glistened with sweat. She knew all too well that Marcus could create these cores as easily as printing a sheet of paper.

"Hmm?" Marcus replied casually, "This is to ensure we have a comfortable time testing the rifles." He began setting up the cores.

Serafall exchanged a disbelieving glance with Grayfia and Venelana. The more she witnessed Marcus's inventions, the more her sense of reality seemed to warp. One core could hold off an army of powerful beings. Two could create a fortress worthy of the greatest pantheons. But three? She couldn't even fathom.

Within moments, the dimension shimmered with magical energy. Magic flowed through the very fabric of the space, saturating the ground and air.

If this were a cultivation reality, this place would be the ultimate destination for cultivation. But instead, it would serve as a shooting range for Marcus's rifles.

As Marcus laid down the barriers in a precise configuration to contain the blast, Serafall could only watch in awe. The teen inventor was ready.

Dressed in his Mark I armor with upgraded hand armor and energy wings, Marcus was prepared for the test.

He lifted his right hand and examined the silver rifle in his grasp. The weapon was sleek and futuristic, with a hexagonal barrel. Inside, a magic circle slowly spun, and it would continue to spin for a very long time. The rifle looked like something straight out of a science fiction movie, blending magic and technology seamlessly.

"Let's start with the P.O.D beam," Marcus announced, casually lifting the rifle and aiming.

The way he held it was effortlessly confident, almost as though he were showing off. He pulled the trigger.

Serafall watched in awe as his boots barely budged, even as the force of the blast pushed against him. The recoil seemed to be absorbed and redirected through his body, dissipating harmlessly into the ground.

Though the beam wasn't destructively powerful, it easily erased several powerful barriers, each sustained by the Diamond Core Hearts.

Instinctively, Serafall realized that if that beam had hit her, there would have been nothing left—not even a trace. It would have been a clean, pure erasure.

A horrifying weapon. All of her years of training seemed utterly insignificant in the face of something that Marcus had created in just one day.

"Well, it seems the beam is indeed powerful enough to instantly kill at least five Ultimate-Class beings without any resistance," Marcus said as he lowered one of the rifles. "The barriers didn't even hold for a second. It went clean through them."

He switched positions, lifting his left hand. This time, the barrel of the weapon had widened slightly.

From Serafall's perspective, this was something new. She had never seen one of her Master's weapons create a cannonball inside the barrel before, as opposed to forming it outside the weapon.

But this rifle... it molded the cannonball within the barrel before manifesting and releasing it.

How many stages does this go through before firing? Serafall thought, her curiosity piqued. The other two were processing this differently.

Venelana was speechless, while Grayfia seemed indifferent. It was just another of her Master's new, destructive creations—nothing special, right?

While the beam didn't fully reveal the rifle's raw power, the cannonball was another matter entirely.

The moment the black energy ball, tinged with deep red, left the barrel, a whitish barrier surrounded the spectating devils. The ball's force shattered the sound barrier and nearly warped the space around them.

In the blink of an eye, it was at the far edge of the shooting range, ramming into a barrier-formed target.

What happened next left everyone except Marcus deaf for a moment. All sound was wiped from the area, and the shooting range was plunged into pitch-black darkness, with wisps of red hanging in the air.

The barriers had barely managed to contain the explosion.

Even the two strongest devil women required additional barriers to shield themselves from the initial release of the P.O.D. shaped cannonball.

That alone spoke volumes about how lethal the projectile was before it even hit its target.

"..."

"..."

"..."

"This... how is that possible?! How is the rifle still intact after releasing so much power?" Venelana finally exclaimed, her disbelief evident. She had just witnessed something capable of killing her son—perhaps not in one shot, but the next one surely! It was terrifying how quickly the rifle could fire again. No reload. No time lag. Nothing.

"This rifle has two completely separate magical energy ecosystems inside it," Marcus explained, casually lowering his left rifle and switching to the right. "The M.T.M is still there, while the weapon frame is powered by a separate perpetual energy system. This makes my Sacred Gear powerful—and even eternal, time-wise."

Marcus lifted the rifle once more and casually released an energy bolt...

Or so it should have been. But, once again, the explosion engulfed the shooting range in darkness.

Thankfully, their ears were spared from the deafening silence.

"This... how is that even possible? The energy required for that...!"

"It's called perpetual energy for a reason," Marcus replied nonchalantly. "I don't need to worry about energy. I just focus on pulling large amounts of it. Energy has never been an issue for me."

As he tested more shots, each one was meant to be casual—but the golf ball-sized P.O.D. blasts easily obliterated anything in their path, reducing entire areas to rubble.

"This is bullshit..." Venelana muttered under her breath. She couldn't hold back her frustration. Both Serafall and Grayfia looked at her in surprise. Venelana had probably never sworn in her life—at least, not in public.

"My son spent decades training his power to reach this level. He's the strongest devil alive, and he can only demonstrate that power by transforming! But you? You just pull a trigger!" Venelana said, her voice tinged with annoyance.

"Impressive," Marcus replied simply, as if discussing the weather.

"Impressive that someone can achieve that through training," he added. "I guess I'll need to try harder if there are beings like that."

Venelana's mouth fell open in shock. She suddenly realized she might have just encouraged her Master to create even crazier inventions!

"No, no, no!" she quickly said, shaking her head and flailing her hands. For a brief moment, she looked like a panicked teenager.

"I mean, what you've achieved in such a short time is simply astounding! My son spends an incredible amount of time training, and you did all that in no time at all! There's no comparison!" By now, Lady Gremory was scrambling to flatter her Master, not wanting him to accidentally create something that could crack the planet.

"Obviously. Your son trained his magic to reach that level. But where he built a castle from the materials he found, I brought materials to build mine. Where he built it by hand, I built it with the instruments I created. I did what humans do best—I found a way to build it faster, easier, and more efficiently. His hard work is impressive, but it takes him a lot of time. That's all there is to it, Venelana. He's a fighter, and I'm an inventor and engineer. I invent while he fights.

Comparing us is pointless. You should compare engineer to engineer, fighter to fighter. I'm never going to fight with warrior's honor—that's for warriors to do. More specifically, I'm not even going to fight... I'll simply disable the enemy and take them to the lab to study. That is, if they have something worth researching. If they're a boring enemy, I'll just..."

Marcus lifted his rifle again and fired at the target.

Once more, the shooting range was plunged into pitch-blackness, with the blast nearly deafening Venelana. The message was clear.

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