A Demon King Through The Worlds

"Blood pressure and heart rate are stable and maintaining a practically constant rhythm."

"The oxygenation of body tissues has been maintained at an adequate level."

"There are no signs of necrosis in the skin or muscles."

"Calcium levels in the bones have not fallen, on the contrary, they have increased slightly."

"No appearance of defective cells."

"In short, no negative effects have been caused to this body so far. The observation will continue for a few more days."

Lucian checked and documented the body of his blood puppet. Although the observation period wasn't exactly ideal, after all, some effects might only appear weeks, months or even years later.

Therefore, doing this for just a few days wouldn't provide all the answers.

"Two days inside this body... I can't take it anymore, I have to get out of this cramped place." After a while, Lucian simply got tired, staying inside a small pocket space was very tiring.

This taught him an important lesson – if you're going to own a body, completely replace the soul and nervous system of the original owner, or at least make yourself the main part.

"Now I understand how the bijuus and Sukuna felt. Perhaps not Sukuna so much, since he consented to it and used it to resurrect himself, but the tailed beasts were sealed against their will for years."

Said and done. He soon began to leave as the blood flowed out of blood puppet number 1. This ability he had discovered was very useful.

Turning the body into a liquid state is very convenient for stealth, plus it can be used to hasten regeneration, or rather the renewal of body parts that have been lost.

This benefit is thanks to the malleability of the liquid form. And of course, this malleability also improves the ability to modify the body.

First all the cells and the body are in their normal state; then they are all put into a homogeneous, liquid state; finally, the liquid is put into the desired shape and soon the cells differentiate again, turning into bones, muscles and the other internal organs.

Lucian then stretched, who knew that being inside someone else wouldn't be so pleasant?

"Next time I'll make sure I have a five-star experience," he sighed before walking off, "Let's see how the training of... the untrained is going."

Well, he was about to say that he was going to look at the children being trained by Kokushibo, but he remembered that it wasn't just children who were training.

Kie, who until recently was just an ordinary housewife, naturally needed training to achieve sufficient combat power. The same goes for Ryoko Fueguchi, who simply has no combat skills.

Kanao Tsuyuri and Hinami Fueguchi had also stopped being children, at least in Lucian's mind.

No matter the situation, Kokushibo was still the best person to teach, after all he has hundreds of years of experience, both as a demon hunter and as a demon. When the breathing techniques appeared, he was already practicing his technique as a swordsman and soon after the first one appeared, he created moon breathing.

As for whether he's good at teaching... it's not much, but it's enough, especially considering how pragmatic he is.

Akaza, on the other hand, is clearly not the teaching type, and Gyutaro doesn't have much to teach.

It wasn't long before Lucian arrived at the training ground and could see everyone struggling as they swung their swords.

Although a sword wasn't really necessary, especially considering that Ryoko and Hinami are ghouls and therefore their main means of attack is using the kagune.

Breathing techniques are used in conjunction with swords, but they can be used without a sword and still receive the physical strengthening effect.

The reason for using a nichirin sword was because only they were capable of killing demons due to the fact that they contained sunlight.

"Are they making progress?" Lucian asked Kokushibo, who had approached when he saw him coming.

"Yes, you were right, Tanjiro is very talented and his body was practically ready to use the sun breathing, although it will probably put a lot of pressure on him and Hinami really has good perception skills and learned quickly. The others are also doing well." Kokushibo gave a brief summary of his recent mentoring.

"I see. I assume that the difference in physique possessed by the ghouls is showing an advantage when compared to the others," Lucian commented as he turned his gaze to Ryoko.

"Yes, on the other hand, the fact that they have a human physique and are young greatly reduces the extent of the training I can carry out on them." Kokushibo nodded, then pointed at the children of the Kamado family.

"That's to be expected, in fact, they're performing very well, considering that they don't have the same recovery capacity as the others." Lucian also nodded, but noticed a little hesitation in Kokushibo's expression, "Do you have anything to ask?"

And just as he imagined, Kokushibo brought up a doubt he had in mind: "Why not turn them into demons right away?"

"They're too young, the transformation will slow down their mental and physical development, meaning they'll look like children forever and nobody wants that. Plus, if they already know a breathing technique, they'll be more powerful after the transformation," Lucian explained.

He still remembered a demoness who had lived for several years, but continued to look childish.

"I see, you have a good point. By the way, coming to this world really was a good decision, since we arrived my power has grown tremendously." Kokushibo couldn't help but smile as he said this, breaking out of his usual indifference.

"I can see that, you're already at 703 BP." Previously Kokushibo had only just over 600 BP.

And in this relatively short period of time, the number had increased a lot, unfortunately the number of ghouls is not as large as it might seem.

Demons are insatiable, so there has to be a control on consumption, otherwise ghouls could end up as an endangered species.

Lucian then continued: "I'm already at 1,300 BP. Compared to the restriction that existed in the previous world, this world is much more conducive to our 'feeding'."

In the previous world most humans had 0.6 BP, in this world most have 0.8 BP.

In addition, this world also has ghouls, and even the weakest can easily have 50 BP.

Those rated as SSS can have more than 1,000 BP, although this rating is not such a good way of measuring strength, as it represents how dangerous the individual is considered by the CCG.

Therefore, this assessment can consider the strength the individual possesses, the damage they have caused or the influence they have over other individuals.

In other words, individual A, who has the same strength as individual B, may have a higher rating because he is the leader of an organization or a friend of another powerful ghoul.

In any case, this means that by devouring certain individuals, a demon can become extremely powerful almost instantly.

'I estimate that Yoshimura has around 1,100 BP, while Eto is even stronger.'

"Hearing that only makes me more eager for the future fights." Kokushibo's grin widened and became predatory, his bloodlust could even be felt.

"We all are. You can keep training them, I'll go to Anteiku." Lucian's expression became similar to Kokushibo's, but she soon calmed down, returning to her usual slight smile.