A Demon King Through The Worlds

After being used, their familiars dissolved into blood and returned to their bodies. In case there's still any doubt, this is why familiars can't survive if they're too far away from their creators.

They are made of blood and that's all, all the vitality they have comes from those who created them, so if they get too far away, they stop receiving the vitality they need to continue existing and dissipate. That's why he created those towers that relay "signals".

Essentially, it's not alive, even if it can act with a certain autonomy, it's somewhere between a puppet and a living being, of course, it's closer to a puppet.

Leaving that aside, Lucian then reinserted the eyeball.

"Damn! It's harder to reconnect an optic nerve in another body than I thought!" If it were his demon body, a new eye could easily be generated, but it seems that ghouls have a bit of trouble when it comes to that.

"Maybe I need to ingest something to activate the regenerative factor... My blood won't do, I'm trying to keep this body like a ghoul."

So he simply sat down next to the two corpses and began the ancient ritual known as feeding.

Eating bite by bite, he soon realized that this method of feeding is somewhat inefficient compared to the demons' ability to absorb entire bodies in one go.

Chewing is fun, but when you consider two grown men, it becomes a very time-consuming process.

"After all this time I've only eaten one arm... I give up, I'll use a faster method." Again spilling his blood, he formed a mouth to devour the two bodies quickly.

"Noted! Demons have faster digestion than ghouls."

.....

"Why are you like this?" Shinobu asked confusedly, looking at 'Lucian' intently.

There was no reason for him to have completely altered his appearance, aura and energy, was there?

"Oh, that? I'm possessing the body of a random ghoul." Lucian shrugged, his voice finally coming out in a way that didn't sound distorted and mixed with other sounds and noises.

"And what are you doing that for?!" Hearing that answer, a vein in Shinobu's forehead popped. Perhaps the lack of information in that answer made her a little angry.

"Initially I wanted to know if it was possible to use my blood to control someone without turning them into a demon, so I came up with some ideas and now I'm testing the effects caused by prolonged exposure to demon blood. The hardest part is containing the toxicity of the blood so that the guinea pig doesn't die." Lucian finally elaborated a little more.

"Indeed, it's an interesting idea... I think I should also think about using blood as a poison, or rather, I've thought about it, but I haven't implemented it yet." However, it couldn't go on like this, Shinobu's pride as a poison user wouldn't allow that to happen.

She used to use poisons that only worked on demons, but now she's a demon she's going to have to adapt to that.

"I usually use about seven milliliters to turn adults into demons, that is, approximately one milliliter for every ten kilograms, naturally, I adjust this dosage depending on the individual.

By reducing this dose to one tenth, the transformation becomes impossible without some abnormal factor stimulating the process, but it would still end up damaging all the body's systems and causing a slow and painful death, it's a very good method of torture.

Double the dose, and a quick and violent death is basically guaranteed. Of course, your blood is different from mine, so this information isn't that useful, but you can still isolate the part of the blood that is toxic and concentrate it for greater effectiveness, plus the kekkijutsu you will awaken in the future may have something to do with it."

Lucian thought for a second before saying some information he had, Shinobu's blood naturally has similar characteristics, all the demons he created are like that, so she could still use it as a reference.

She would just have to consider a much higher dose...

But blood isn't exactly poisonous, it's similar to what happens with radiation – a high dose of radiation damages DNA and can cause great harm.

Similarly, his blood causes mutation: too large a dose leads to rapid, uncontrolled mutation and the body collapses; too small a dose causes the mutation to be incomplete and the DNA collapses.

"In other words, you want me to devour more people to awaken a kekkijutsu?" Shinobu tilted his head and looked at Lucian as if he had discovered his intentions.

"Yes." He nodded, "It would also be interesting if you started injecting yourself with cyanide."

"Why would I do that?" Shinobu's brow furrowed in confusion.

"Best method to 'guide' the awakening of kekkijutsu, or at least alter the characteristics of your body. And cyanide is a very suitable poison, after all, it prevents the blood from carrying oxygen," Lucian replied.

That seemed like a good method for demons to use.

"But then I'll die, won't I?" Although he knew about the regenerative capacity of demons, Shinobu didn't believe that he could inject cyanide into his veins and still be fine.

"Demons don't need oxygen, or the need for it is very low. Anyway, don't inject more than the lethal dose for humans and probably nothing will happen."

"... I think it's reliable enough, I'll start soon."

"Ah, the possession was actually very useful, I've just discovered that the mutation speed of ghouls is faster than that of demons, so they can get to the kakuja much more quickly." Lucian suddenly changed the subject, remarking on his recent discovery.

With both possessing rc cells, the ghoul organism handles them better, presumably thanks to the long period of adaptation they've had.

It could also be thanks to a difference in priorities: in ghouls, rc cells naturally occupy the highest priority; in demons with rc, the demonic lineage comes first.

In addition, the rc cells arose naturally in the ghouls and altered them, while the demons need to carry out an integration of their own accord.

'Although a new generation of demons will eventually appear in this world, one born with rc cells.

"An unexpected discovery, how much of a difference?" Shinobu nodded when he heard that, it might not seem like much, but something like that was enough to change everything.

"A lot, I estimate it's somewhere between ten and twenty times. So waiting for a ghoul to get the kakuja and then devouring it is much more efficient than trying to get it yourself." Lucian concluded the line of thought.

"Do you already have a plan to make that happen?" she asked, but she already knew what the answer would be – yes.

"Yes, I'm going to get some of the guinea pigs we have to reach the rc needed to transform into kakuja."

"By the way, I want you to take one of those quinques from the CCG." Shinobu then made a request. As someone who has used special methods to deal with beings that go beyond humans, she is naturally curious about the weapons used by the CCG to hurt ghouls that are practically impenetrable.

"Do you have a specific type in mind?" Of course Lucian wouldn't refuse a request from his beautiful wife, even more so when it was so simple.

"It could be any of them." Shinobu smiled, happy to have his request accepted.

"I heard you and Kanao went out earlier, did you have a nice chat?" Lucian finally asked something he'd been wanting to know for a while.

"Earlier? It was yesterday."

"Yesterday was before now, so it was earlier."

"That was a good point, and yes, the conversation went very well."

"How nice... did you get your redemption?"

"Yes... I think so. She seemed happy to hear that Kanae had been avenged and with the comforts provided by this world, I think it won't be long before she gets used to it."

"Another piece of good news!"