A Demon King Through The Worlds

After this pleasant reunion, everyone returned to their usual activities, and Lucian would have done the same if Touka hadn't stopped him.

"What? Have you finally given in to my irresistible charm and beauty and want to have coffee with me?" Lucian asked in a provocative tone.

"No. You've made me an offer, and I want to accept it" In contrast, Touka had a serious expression on her face, "I want to get power."

The offer she naturally mentioned was Lucian turning her into a demon, an offer he had made at some point when talking to her, listing the positive points of this transformation.

Things like immortality, eternal youth, greater ease in obtaining power and, of course, supernatural abilities ranging from generating objects to the level of creating dimensions.

"Just what I was hoping for..."

.....

Now Lucian would only have to wait a week or so, after all, that meeting to discuss the ransom took place on the same day that Kaneki was kidnapped.

And roughly speaking, he waited five days to try to escape, was captured by Yakumo Oomori, tortured for a while and it was only when he finally "broke" and started fighting back that the rescue team arrived.

Naturally, this delay was caused by a very simple reason: they didn't know where this Aogiri Tree base was.

And you can't attack an enemy when you don't know where they are.

So Lucian returned to his daily routine - training, developing his skills, having fun, "communicating" with his women.

Until something slightly unexpected happened: one of his guinea pigs suddenly died.

Actually, it wasn't exactly unexpected, since flooding the circulatory system of a human or any other species with demonic blood and using it to control them isn't very safe.

A blood transfusion of a different blood type can be deadly enough, let alone the blood of another species.

And it's the blood of the demon king, a thousand times more dangerous than normal blood or blood contaminated with deadly substances or diseases.

"Although the biggest reason for this lethality is my 'demon poison' and I'm still not able to completely remove it from my blood. I've only managed to leave it at a level below that which causes death, but that just means that death isn't a definite thing..."

The reason for calling the main "mutation-causing element" that is present in his blood is as simple as it could be - it comes from the body of a demon and can cause negative effects in the bodies of others.

'Maybe I need to improve my ability to name things...'

Of course, Lucian had to examine the corpse to get a bit more information.

Since leaving the body of the ghoul he had taken over and starting this experiment to discover the effects of prolonged exposure to its blood, as well as perfecting the creation of blood puppets, he had obtained a few more guinea pigs.

Not many, as it's a very complicated procedure that requires his constant attention.

So in total, there are four individuals being constantly exposed to the demon king's blood, two humans and two ghouls.

The one who died was his blood puppet number 3, a human whom Lucian captured when he was making a bit of money destroying gangs, and with his mentality of not wasting resources, he naturally made the most of those who were captured and those who died.

His number one blood puppet, on the other hand, continued to do well even though he was the oldest, probably thanks to the superior adaptability brought about by his being a ghoul.

"Hmm... a small brain accident... the death of the brain caused the heart to stop working and consequently everything else stopped." Lucian came to a conclusion,

"Well, that's obvious hahaha. When the brain dies, so does everything else. But this is also due to my carelessness, if I had reacted quickly enough I could have limited the damage to just the brain."

Their brains were being used for almost nothing. The blood was keeping the body's activities going, but it goes without saying that without Lucian's intervention, blood alone is not enough to stop all the organs from dying.

His blood is magical, but it's not there yet.

In fact, the subject who has died can still be used as a blood puppet, but he won't be useful for the study on the effects of prolonged exposure to blood.

After all, the dead and the living are different.

Having realized this, Lucian simply used the best way he knew to dispose of bodies - devouring them.

"Interesting, the total energy I got from devouring blood puppet number 3 was higher than expected."

As has already been said, without powers, techniques or any other special factor, humans have a maximum of one unit of blood power. Even in this ideal situation, devouring such an individual would not bring the demon in question an increase of 1 BP.

As a matter of absorption efficiency, most demons are capable of absorbing 70% to 80% of the energy contained in their victims' bodies, and even Lucian, who is the demon king, can only absorb around 90% of vital energy.

But this time it was different, exceeding that 90% limit, and although it wasn't much, it was enough for him to notice.

"I assume it's because of compatibility or something, as if the blood is starting to prepare it for my consumption... which is a useless discovery, unless I intend to create some kind of large-scale 'plantation'."

A discovery is not always a useful discovery, and that's a fact.

"Puppet number one should be the first to get results close to what I expect... just as the rc cells created a race, I really want to see what exposure to my cells can do... something that's a demon, but not a demon. I'm sure the supernatural abilities contained in demon blood are greater than that, I'm sure some unknown mutation will occur." Lucian allowed his thoughts to flow as he delivered his monologue.

His right hand clenched slightly as he looked at the three remaining guinea pigs, "I'll have to replace the lost guinea pig and modify the amount of demonic poison they're receiving, as it caused this brain 'accident'. Ghouls have a higher tolerance due to their rc cells, so they can receive more, which will increase the mutation rate. On the other hand, humans who have a low resistance should receive less to prevent accidents from happening."

As he had mentioned earlier, a low amount will cause a slow death, and what he wants to do is make the dose of demonic poison even lower.

However, as he just realized, the amount wasn't low enough and ended up causing a harmful mutation in some brain cells and these harmful cells damaged the ones that were still healthy, causing him to lose some of his precious time.

"Although I say it's an 'unknown mutation', I'm expecting improvement in the functions of the affected organs, in resistance and vitality, in other words, special organs. Basically a kakuhou demon version." Lucian smiled as he regulated the amount of demonic poison each blood puppet was receiving.

The only problem is that removing more of their poison is more laborious and requires more time.

"... Injecting vitality would be a good way to speed things up, I need the ability to manipulate vitality. It would be useful for so many things, for healing, combat and maybe growing some plants, as well as being a perfect match for the unlimited vitality characteristic that demons possess."

Lucian reflected on this thought that had arisen in his mind. In fact, even during the time he was an ordinary person, such a desire had arisen in his mind, after all, this power is very convenient.

And considering his recent increase in power, he might awaken a new kekkijutsu.

"250 BP for each Kekkijutsu."