Starting from Ainz Ooal Gown, simultaneously traveling through time

Since combining knowledge and skills from three worlds, Leylin has been trying to find a way to truly replicate their power in this world.

Valyrian steel swords from Game of Thrones, elven longswords and dwarven mithril armor from Lord of the Rings, and alchemical weapons of dragons…

These are certainly powerful, and they can also provide him with assistance in battle.

But when faced with an existence like the "Rotten Coffin Dragon King"—a true dragon king with a level of 95 and whose breath inflicts instant death and soul annihilation—

These weapons are still not enough.

What he needs is not a "sharp weapon," but a "killing weapon."

A "decisive weapon" that can reverse the power gap and truly threaten the Dragon King.

Today, he's going to try something like this.

In the Kassel College of the Dragon World, there is a gathering place for lunatics known as the "Equipment Department".

Everyone there has a simple yet fanatical pursuit in their lives: making bombs.

Larger bombs, more powerful bombs, and—theoretically comparable to nuclear bombs, specifically designed for slaying dragons—the [Alchemy Nuclear Bomb].

It is said that this weapon is powerful enough to severely injure or even kill the first-generation Dragon King with a dragon body. Although it has never been actually used in combat, its design concept and destructive power are terrifying enough.

Dragon Raylin managed to obtain the core design blueprints for the "Alchemy Nuclear Bomb" from the Minister of Equipment.

Now, what Leylin needs to do is to create it in this world.

"Everything is ready, except for the final push," he muttered to himself. "Once the supplies arrive, we can begin."

The supplies were all delivered by the evening of the following day. The efficiency was so high that Duke Caius clearly dared not neglect the new crown prince's request.

Leylin did not linger in the royal city for even a moment longer.

This thing is too dangerous; even a tiny mistake during its creation could send half the royal city into the sky.

He used [Teleport] to bring all the materials back to the depths of the forest where [Monarch Flame] had once been tested.

The center of the crater once created by the blast has now become an excellent testing ground—open, secluded, and safe so that even if something goes wrong, innocent people will not be affected.

He took out the materials, calmed his mind, and spread his spiritual energy outwards, enveloping each item.

The real challenge has begun.

Unlike forging swords and creating summoning items, the alchemical nuclear bomb is so complex that it makes your scalp crawl, and every step requires absolute precision.

From etching layers upon layers of interlocking alchemical matrices onto a special alloy projectile, to purifying and infusing alchemical mercury with properties that kill dragons, to fusing sulfur, saltpeter, and other substances into a high-explosive charge using a specific alchemical sequence, and finally installing a sophisticated fuse and activation core...

Every step requires complete concentration; one's mental energy must operate like a precision machine tool, allowing no room for error.

For three whole days and nights, Leylin neither ate nor drank nor slept, completely immersed in this creative process of dancing with danger.

Thanks to his increased mental strength and control after integrating knowledge from multiple worlds, he compressed a process that would take the equipment department several months to complete into a mere seventy-two hours.

When the last rune was embedded in the projectile, triggering a stable magical fluctuation from the core, Leylin finally breathed a sigh of relief.

Before him stood a three-meter-tall columnar structure, its surface shimmering with a dark gold metallic luster and deep blue alchemical patterns.

It has no ferocious appearance, but it exudes a chilling, restrained aura of destruction.

"It's done..." Leylin's voice was slightly hoarse, but more than that, it was filled with barely suppressed excitement.

A weapon that was theoretically powerful enough to threaten the Dragon King was now being created in his hands.

Although it has not yet been tested in actual combat, and no one knows how effective it will be against the true dragon king in the Overlord world.

An extremely audacious idea flashed through his mind in an instant:

Should we... head straight to the Katinias Mountains and try out the Coffin Dragon King?

The next second, he ruthlessly extinguished that thought.

That would be tantamount to suicide, and it would also alert the enemy. This trump card should never be revealed lightly before one has absolute certainty or is in dire straits.

He calmed himself down and used the [Item Appraisal] skill on the alchemical nuclear bomb.

Feedback indicates that its grade is approximately [Heritage].

Judging solely by its item level, it is indeed insufficient to seriously injure or kill a being at the level of a True Dragon King. However, as a one-time consumable item, its instantaneous destructive power is likely to far exceed that of a normal weapon of the same level.

"We need to find a suitable target to verify its actual power..." Leylin pondered.

"Ideally, it should be a dragon, but not the Dragon King..."

Obviously, there are no ideal experimental subjects nearby.

He carefully stored the heavy alchemical nuclear bomb in the deepest part of his personal space, in a secluded and secure corner.

"Speaking of which, what in the dragon world can truly threaten or even kill the Dragon King..."

He recalled the existence of the Shinshin fighter jet, the Divine Punishment satellite, and other such weapons, whose technological development had clearly veered off course into an almost science fiction realm.

There are similar or even identical products in reality, but their effects are nowhere near as powerful as those in the novel.

"I don't understand the principles at all, but the descriptions of their power are all exaggerated... I'll have to have the dragon Leylin pay more attention to the relevant design drawings in the future."

In the following days, Leylin obtained several more batches of materials through Duke Caius and, following the same method, produced several more alchemical nuclear bombs.

Such a powerful weapon is naturally always welcome in greater numbers.

However, material bottlenecks soon emerged.

The biggest problem is not the rare sulfur, but rather the seemingly ordinary "mercury".

The alchemical nuclear bomb requires an enormous amount of magical mercury, with each production consuming "tons" of it, and the world's mercury production simply cannot support such a large and continuous demand.

After completing the stockpiling of several more, Leylin had to temporarily halt operations.

He instructed the Duke of Caios to gradually increase mercury reserves and imports without affecting the kingdom's economy and people's livelihood.

This caused great distress to Duke Caios.

He stared at the staggering consumption list, filled with doubt and worry: What exactly is His Highness making? Why does it require such a massive amount of dangerous materials?

He privately approached his daughter, Annie, hoping she could find out some information.

Anne did notice her husband's recent unusual behavior; he often didn't come home for several days at a time, and when he did return, he looked undeniably exhausted.

So, one night when Raylin returned home late at night, Anne brought him hot tea and asked softly, "Darling, what have you been busy with these past few days? Father is very worried, and I... I'm worried too. You said you were doing an important experiment, but I've never seen you so exhausted, not even having time to come home."

Leylin interrupted Anne, saying softly, "Duke Chaos sent you to question me, didn't he?"

Anne didn't deny it, and nodded: "It was indeed my father who asked me to ask you, but I'm also a little worried. Is there something you're hiding from me?"

Leylin patted Annie's head and said slowly, "Annie, you don't need to worry. I'm just preparing for the future."

Annie exclaimed in surprise, "The future? Did you foresee something?"

Leylin: "In the future, there may be a crisis, and I am looking for a solution to it. The materials that Duke Caius sent are actually one of the solutions I have created to solve the problem."

Anne suddenly realized that she had never doubted her husband's judgment and sense of responsibility. Her husband would not make such a pointless statement; he must be doing something extremely important.

Anne held Leylin's hand, her voice gentle yet firm: "Darling, I don't know what that crisis is, but I know you're doing the right thing, so go for it bravely. But please don't overwork yourself; take care of your health."

Leylin hugged Annie: "Don't worry, I will."

He may have been able to drift along with the tide and felt powerless in the face of fate, but now he has seen the light and is determined to seize it!