Super God: The Foundation, Starting by Inventing SCP

Any one of them could destroy a universe.

[Sakazuki: I admit I underestimated how dangerous SCP-049, the Plague Doctor, is. In a way, it's more dangerous than the previous two anomalies!]

[Hiruzen Sarutobi: Exactly! Its surgical procedures are terrifying. Give it a little time, and it can raise an army!]

[Orochimaru: Its ability resembles Impure World Reincarnation. But that technique has many restrictions. For its surgeries, all it needs are corpses!]

[Tatsumaki: It's like the Zombies in movies from our world! Only much worse!]

[Sengoku: Thank goodness it didn't appear in the pirate world. We'd be doomed!]

[Kaido: I can't believe I agree with you, Sengoku!]

[...]

As the people in the livestream discussed SCP-049's bizarre surgeries, the Plague Doctor had already led its army of SCP-049-2...

To the next town.

But something seemed to have slaughtered the town before it arrived. Ruined buildings and mangled corpses lay everywhere.

SCP-049 paused at the sight. Then it said slowly in a raspy voice full of compassion, "The patients here have already been treated."

"But that doctor seems terribly unprofessional!"

"He only destroyed the carriers of the 'plague.' He didn't eliminate the plague itself."

SCP-049 paused, then continued, "I can't stand half-baked doctors!"

"Oh, well!"

"Helping people is what I do."

"I'll finish the job for you!"

It looked up at the translucent figures hovering over the corpses, terror etched on every face. Then it extended its withered right hand...

And tapped the empty air.

Cracks spread across the translucent souls. In the blink of an eye, they vanished completely.

After destroying those souls on a conceptual level,

SCP-049 ordered its SCP-049-2 army to collect the bodies while it pulled one surgical instrument after another from the medical bag at its side.

Once all the bodies had been gathered, SCP-049 began its surgeries.

The livestream audience endured five or six minutes of sickening footage. By the end, every resident of the town had been transformed into SCP-049-2.

SCP-049 seemed dissatisfied with its progress.

It ordered the SCP-049-2 army to spread out and capture more 'plague carriers.' It took Giyu Tomioka, Tanjiro, Nezuko, and the other SCP-049-2...

And headed toward the city.

Judging by the 'plague concentration,' it was much higher there than in these towns.

Those patients needed its personal attention.

Half an hour later, thanks to its tireless SCP-049-2 army's slaughter, SCP-049 had successfully 'transformed' tens of thousands of 'plague carriers.'

As soon as they were transformed, the new SCP-049-2 set out without hesitation to hunt more 'plague carriers.'

The cycle continued...

And the number of SCP-049-2 grew exponentially.

The livestream audience felt their scalps prickle at the sight of SCP-049-2 swarming across the hills.

Only three hours had passed!

Their numbers had grown from a few hundred to tens of thousands.

At this rate, how long would it take for everyone in the Demon Slayer World to become SCP-049-2 under the Plague Doctor's scalpel?

Terrifying!

Utterly terrifying!

The sight sent chills through the powerful viewers from other worlds. It also deterred quite a few fools...

Who had planned to change their fortunes by exploring the Demon Slayer World.

Of course, the worlds were vast!

Some people always believed they were destined for greatness. Hoping to find fortune amid danger, they resolutely crossed the Great Worm Bridge into the Demon Slayer World.

There weren't many of them, relatively speaking.

But together, they numbered around a million. With so many pouring into the Demon Slayer World, some lucky souls soon encountered the SCP-049-2 army hunting 'plague carriers.'

A dozen minutes later, explosions erupted in the livestream. In the direction of the noise, enormous fireballs appeared out of nowhere...

And bombarded the SCP-049-2.

The viewers froze for a moment, then understood.

The SCP-049-2 must have encountered people exploring the Demon Slayer World. The only question was which world those 'lucky' people came from.

The distant explosions caught SCP-049's attention.

It turned toward them and said in an angry rasp, "Damned 'plague.' I knew it wouldn't let me purge it from this world without a fight."

"It even controls its 'carriers' to attack me!"

"Still, I know you have no choice."

"As a doctor, I'll treat you all equally!"

With that, it raced toward the explosions with Giyu Tomioka, Tanjiro, and Nezuko, now all SCP-049-2!

When SCP-049 reached the site,

The livestream audience finally saw who these 'lucky' people were. Three ninjas stood there, their faces marked by distinct cracks. Judging by the emblems on their forehead protectors,

They were ninjas from Konoha Village in the Ninja World!

[Hiruzen Sarutobi: That's Gen Uchiha and the others from the Uchiha! Didn't Uchiha Itachi kill them on the night of the massacre? Impure World Reincarnation! Good... very good! Wonderful!]

[@Orochimaru, explain yourself!]

[Orochimaru: @Hiruzen Sarutobi, Teacher, would you believe me if I said I wasn't the one who reincarnated them and sent them to explore the Demon Slayer World?]

[Hiruzen Sarutobi: I would! I know you. You wouldn't lie about something like this! Then who was it? @Pain! Was it you?]

[Pain: No! My goal is world peace, not the destruction of the world. Why would I send people into the Demon Slayer World?]

[Kazekage Rasa: It wasn't me, either! I don't know Impure World Reincarnation!]

[Raikage A: Same here!]

[Mizukage Mei Terumi: Same here!]

[Tsuchikage Ōnoki: Same here! @Hiruzen Sarutobi, don't tell me you sent them?]

[Hiruzen Sarutobi: Why would I do such a thing?]

[Tsuchikage Ōnoki: @Danzo, then it must be you!]

[Danzo: @Ōnoki, I don't know Impure World Reincarnation!]

[...]

While the livestream audience tried to identify who had sent the ninjas into the Demon Slayer World, SCP-049 looked around at the mangled SCP-049-2 bodies covering the ground...

And said angrily to Gen Uchiha and the others, "You carriers of the 'plague'!"

"Despicable!"

"I promised them I'd revive them once I found a perfect cure for the 'plague'!"

"You've made me break my word!"

"Damn you!"

Gen Uchiha and the others had wanted to flee the moment they saw the SCP-049-2 army.

After all, they could watch the livestream despite having been brought back through Impure World Reincarnation.

They knew how terrifying SCP-049 was, especially its ability to destroy souls. But the person controlling them from behind the scenes...

Was determined to use their lives to test SCP-049's strength.

Their controller had forced them to slaughter the SCP-049-2, then kept them there despite their resistance.

All to wait for SCP-049 to kill them.

Just as Gen Uchiha and the others were about to lose hope, the person who had reincarnated them released the restrictions. The instant they felt their freedom return...

They fled without hesitation, each in a different direction.

None of them wanted to face SCP-049.

It was an anomaly!

It might look much like a person, and its clothing wouldn't stand out much in the Ninja World. But it truly was an anomaly that had escaped from the SCP Foundation.

It belonged to the same class as SCP-173, which had slaughtered Yan of the Holy Left Wing, and SCP-096, which had wiped out an entire civilization.

If they didn't run now,

Were they supposed to stay and die?

"You even intend to spread the plague elsewhere!"

Seeing Gen Uchiha and the others flee in different directions, SCP-049 said furiously, "You deserve to die!"

"Stay here and accept treatment!"

As it spoke, SCP-049 extended its slightly withered right hand toward Gen Uchiha.

Then the livestream audience saw something bizarre!

Gen Uchiha and the others kept running, but after SCP-049 extended its hand, no matter how hard they tried,

They couldn't widen the distance between themselves and it.

In fact, the gap was rapidly shrinking.

Moments later, SCP-049 touched each of their foreheads with a finger. The instant it touched them, all life was conceptually erased from Gen Uchiha, the others, and the ninjas used as sacrifices.

Petal-like fragments peeled away from their bodies, revealing the sacrifices underneath.

"You killed many SCP-049-2!"

Watching the fragments scatter, SCP-049 said, "But I know the 'plague' was controlling you!"

"As a doctor, I won't discriminate against you!"

"Once I find a perfect cure for the 'plague,' I'll revive you too!"

"For now, I'll perform your surgeries!"

SCP-049 pulled surgical instruments from the bag at its side and began its nauseating procedures.

The viewers were about to leave the livestream and return once SCP-049 finished its surgeries.

But then they noticed something astonishing.

SCP-049 wasn't operating only on the sacrifices. It was performing surgery on the petal-like fragments as well.

Could it transform even those ashes?

At that thought, the viewers—especially those from the Ninja World—forced down the urge to vomit and kept watching.