A Demon King Through The Worlds

As Lucian's blood spread throughout Kie's body, a tingling sensation appeared.

Unlike Mitsuri who writhed violently, destroying everything around, Kie was shaking, the intensity was low, but the frequency was very high.

It seemed like Kie's body was paralyzed, unable to move or make any sound.

She just felt like ants were crawling through her veins, into her bones and biting her nerves.

Slowly biting every inch of her body and dripping putrid liquid into her soul.

The searing pain clouding her thoughts.

As the transformation process ceased, Kie just remained dazed with empty eyes.

Lucian approached her, and held her shoulder lightly, shaking her a little, trying to wake her up.

Soon Kie recovered her senses, and turned to look at Lucian.

"...It was even worse than I thought it would be." Weakly commented Kie, the dreaded sensation still imprinted in his mind.

"I said it would be bad, but look positively, you completed the 'test' and now your potential is as high as it could be." Lucian said, in a way trying to comfort her.

It is an unpleasant but rewarding experience.

"At least this…" Kie mumbled lightly: 'a reward is the least'

The days that followed were a little more boring.

Simply spending time with Kie and his kids, and training a little to get the most strength possible.

Although he had already reached the limit of his power, something Muzan had also encountered.

Literally the limit of how much more powerful someone could become in this world.

'Maybe I should create a system for quantifying power… I'll call it Blood Power'

This name may be somewhat casual, but it is what makes the most sense, demons are transformed by their blood, and they consume flesh and blood to strengthen themselves and their supernatural powers use blood.

The importance of blood for them is demonstrated by the great attraction they have for marechi blood.

"So the strength, speed, regeneration and strength of kekkijutsu would be linked to the power of blood"

"With the power of blood showing the maximum power a demon would be able to achieve"

Not that blood power was a limiter, just the opposite, increasing blood power is an increase in the limit.

Therefore, a demon with 1 blood power can be stronger than another demon with the same blood power.

 Suppose the limit brought by 1 blood power is a force of 200kg.

Having 1 blood power does not guarantee 200kg of strength, the individual could only have 100kg of strength.

So it must be said that although the link between a demon's strength and blood power is high, blood power is not the only determining factor.

"Humans have less than 1 point of blood power, and the absorption rate is not 100%, so eating 100 humans does not give you 100 blood power."

"Blood power is a quantification of the demon's vitality."

"The power of blood does not increase the strength itself, but the level of the organism, therefore in addition to these physical and supernatural attributes, it also improves the ability to adapt to poisons, temperature, pressure, radiation and other situations that may be encountered."

He analyzed Lucian, contemplating the demon's capabilities.

'I have 1000 BP(Blood Power) and in this world there is no possibility of increasing that level.'

'I will have to obtain the breath of the sun, the transparent world and the mark of the demon slayer' Lucian thought, listing the things that could still improve him.

The breath of the sun was almost in his hands.

The demon slayer's mark was not far away either, with learning a breathing technique and a period of resonance with the Kokushibo, it would come quickly.

The transparent world could only be obtained after the demon slayer's mark.

'In the future it will be called a demonic mark, after all only demons have it currently.' Lucian sneered lightly.

'What should I do next? Attack the Demon Slayer Corps base? I could do that, after all I have Mitsuri to guide the walk.'

'Or should I wait for the results from Daki's side and diminish his forces further?'

'Or just forget about it?... Nah, never ever' Lucian quickly denied.

'Although the possibility about the existence of a certain entity tells me that I cannot develop this world on a basis.'

It's not totally impossible, but compared to other worlds the effort is disproportionate.

Which is better, a world full of resources and relatively easy to master or a poor world in which a new Yoriichi is born from times to times?

"Master Lucian!" Suddenly a call interrupted his thoughts.

"What happened Daki?" Lucian asked, answering her call.

"A hashira appeared in the red light district." Daki replied, a touch of joy clearly visible in her voice.

"A hashira? Describe him" Lucian asked.

"198 centimeters tall, with white hair and fuchsia eyes, he is in disguise, trying to pass himself off as an ordinary customer." Quickly said Daki, giving as many details as she could.

After so much effort she couldn't and didn't want to fail in the final part.

"I see... Tengen Uzui, the hashira of sound." Lucian concluded.

Is it because the attractive Uzui has a certain advantage in the red light district or does it have something to do with "fate"?

Maybe both?

Lucian then snapped his fingers, a door to the red light district appearing in front of him.

The next moment he was next to Daki.

Yes, he had copied Nakime's kekkijutsu in these few days.

To maximize the benefits and save time, he did not create a new infinity castle, but just injected his power into the existing castle.

Now the infinity castle has both him and Nakime as administrators.

As for the owner... It's always been him, even Nakime is his property.

"We won't act for now, we will just observe" Lucian instructed.

"Yes master!" Daki replied, bowing.

"By the way, consider this a reward" Lucian said as he extended a tentacle and injected blood into Daki.

"Thank you master!" Daki said, joy on his face, even if the pulsing veins on her face betrayed her inner turmoil.

'By the way, when and why did she start calling me master?' Lucian suddenly asked himself.

He knew she had been calling him that for a while, but only now did he stop to think about it.

But he wouldn't do anything to stop it, after all it wasn't something unpleasant.

On the contrary, he liked it.

'Why were those protagonists so uncomfortable?'