I'm a monster in Demon King's Castle

The function of the "Authority" includes not only the magic distribution and terrain alteration of the library, but also the permission to access all knowledge. If you control the Authority of the library, there will be no more "forbidden books." You can read them at will, and even sleeping with them won't be affected by the curses within.

As for terrain alteration, it's relatively basic, only allowing you to freely manipulate the earth element of the library to reconstruct several library rooms. No wonder Budiboge's sensory objects included "earth element."

Of course, changing the terrain also requires mobilizing the library's own magic. This is why Budiboge couldn't use it to stop Li Yue when ambushed—the magic was all used by the Brain Lord to heal wounds, where would there be any to spare?

But for Li Yue, using the earth element to change the terrain completely solved his urgent problem. It can greatly speed up the library's renovation progress, which is exactly what he needs right now.

Build a maze? An escape room?

A combination of bloody corridors, ground spikes, chandeliers, and net traps, along with the resurrectable Brains, should meet daily needs.

Acquiring the Authority is neither easy nor difficult—without the condition of being conferred by a Demon King, there is only one way: eliminate the current owner of the Authority and then hold a ritual.

This book is first published on the entire network by 𝕥 𝕨 𝕜 𝕒 𝕟 . 𝕔 𝕠 𝕞

The subtle point lies in… although Li Yue has killed Budiboge's most powerful life, he hasn't completely eliminated him.

To completely annihilate Budiboge's soul, the soul altar must be destroyed; but if the soul altar is destroyed, the Brains will no longer be resurrected, creating a paradox.

In Li Yue's vision, the Brains are a long-term defense force for the library. "Resurrection" is their greatest advantage, so should he abandon them?

As for the content of the "ritual," it is relatively simple. It only requires the corpse of the demon who previously controlled the Authority, plus a book, a handful of soil, and a bit of candlelight, along with a magic circle and a set of incantations.

Mentuo has already told Li Yue about the magic circle and incantations, which are not difficult and the magic power required is within Li Yue's ability. So, the only remaining question is… how to deal with Budiboge?

"Is there some way… to completely eliminate Budiboge without destroying the library's soul altar?" Li Yue's demands on Mentuo are high, never satisfied.

Mentuo was silent—he had never seen a demon who had the ability to kill the area owner but not the ability to maintain the soul altar.

"What you are doing now… is a feasible attempt," Mentuo sighed. "Each time Budiboge is killed, his soul will become more fragile, and his control over the Authority will decrease."

"As long as you are the one who kills him each time, and keep it up… when enough time has passed, the library's Authority will infinitely approach your hands, which is equivalent to being in your hands," Mentuo paused. "And as long as your control over the library exceeds half, killing Budiboge and holding the ritual should complete the transfer of Authority."

Li Yue understood Mentuo's meaning, and also deduced something else—Budiboge is still the Brain Lord at this moment, and the Authority is still on him.

Since that's the case… if there's no way to seize the Authority in a short time, wouldn't it be over if he controlled him?

Without touching the soul altar, kill Budiboge once a day, transfer the Authority, and sign a soul contract with him, turning him into a follower; until the progress is more than halfway, hold a ritual, and the library will be mine.

"So that's it! It's enough to sign a soul contract with Budiboge!" Li Yue suddenly realized. "He can still be his Brain Lord, as long as he is mine, the library is mine."

"You understand soul contracts?" Mentuo couldn't completely read minds, only seeing the images Li Yue was currently thinking of, and only now knowing Li Yue's plan.

It's not a bad way to be clever.

"I read it in a book, thank you," Li Yue was grateful for Mentuo's blessing—without "Absorption," so many forbidden books would have been enough for Li Yue to explode countless times.

"Heh, a joke, it must be a joke," Mentuo's reaction was comical. "Do you have the materials?"

Demon bat wings, Syntis snails, tiger-striped gecko feces… Li Yue thought about it and felt that there was still a chance. After all, Budiboge is now just a low-level demon, and the materials needed are not very high-end.

"Or, can you give me some?" Li Yue didn't let go of the chance to fleece Mentuo—this guy is very stingy, not giving any malice, so he can only try with materials.

"Do you think I'm that low-end?" Mentuo's way of saying "no" was very convincing. "Go try it yourself, if I do it for you, you can go die."

This is a simple logic—Mentuo wants to teach a Demon King, not become a Demon King himself.

"Understood," Li Yue felt it was worth a try, and roughly figured out Mentuo's bottom line—he can provide help, provide knowledge, but will not directly help Li Yue achieve a certain goal; and if Li Yue's actions deviate from his expectations, he will even impose some negative effects.

After a communication, Li Yue was determined to obtain the Authority of the library, and could even plan his future development in advance; as for the possible arrival of "high-level demons"… as long as Budiboge is not completely dead, there is still room for disguise and maneuvering.

After solving the questions related to advancement and Authority, Li Yue only had a few small questions left. Taking advantage of Mentuo's relatively high cooperation now, he asked them all at once.

"By the way, what's the matter with the thirteenth library room?"

The worm on Mentuo's chin twitched, silent.

"There's a cloak on the altar, what's inside the cloak?"

The worms trembled wildly, as if chuckling: "These two things, and the 'door' outside the upper layer, are all choices related to your destiny, I will not give an answer."

Li Yue was a little hateful, hating that he hadn't parsed Mentuo well enough to find out his true thoughts.

"Then… what are you going to do with this egg?" Li Yue changed the question.

Mentuo's worms trembled wildly again, then instantly solidified, and said coldly: "Its growth… requires many kinds of materials, materials beyond your reach, you can't afford to raise it."

Li Yue thought to himself that it was indeed an egg summoned from another world, naturally so noble.

"Moreover, you shouldn't think… that I'm only training you to be a Demon King, right?" Mentuo touched the egg, the kind of affection, just like it was his own.

Li Yue was stunned—the egg is also a candidate for the next Demon King?

It's not impossible… as long as we quickly sign the contract that represents a "good relationship"—Li Yue was a little anxious, wondering when the egg would wake up.

"So you finally know about soul contracts, wanting to sign them everywhere?" Mentuo confused the difference between the soul contracts of the real world and the contracts given by the Demon Illustrated Handbook, and thought that Li Yue wanted to sign the former.

"Let me try?" Li Yue was really afraid that Mentuo would run away with the egg.

"After this red hour, I will take it away," Mentuo only gave Li Yue one night to try. "Before that, it's still yours."

"Okay, wake it up," Li Yue agreed decisively.

Mentuo gladly awakened the egg—this otherworld demon had no idea that when it woke up, it would be worry-free for the rest of its life, becoming a "closed disciple" of the Demon King's mentor.

"Come with me, I have something to discuss," Li Yue called the egg out—he still didn't want to fully expose the functions of the Demon Illustrated Handbook in front of Mentuo.

Mentuo didn't care: "That's good, next, I will look forward to and witness your path."

The seven Mentuo waved to Li Yue together: "I wish you to take charge of the library's Authority as soon as possible, and I also wish you to eat well, sleep well, and kill happily."