I'm a monster in Demon King's Castle

Li Yue, swaying, mustered his exhausted body to move to Budiboge's corpse and collect materials. Google search reading

Let's not talk about the library losing its master and releasing countless magic powers; nor about Li Yue removing the Sword of Damocles from above his head, gaining freedom from now on. Just the 'materials' that the Brain Spirit Lord could provide made Li Yue look forward to it immensely.

Skorlik dropped 'Bone of Self-Healing,' the Book Demon dropped 'Binding Thread,' Finley dropped 'Magic Wolf Fang,' Bosch dropped 'Lava Right Hand'... Each one became a part of Li Yue's body and was truly converted into combat power.

One more 'material' from Budiboge, the Brain Spirit Lord's material, might trigger a qualitative change?

Logically speaking, the material dropped by a Brain Spirit should be more helpful to the Brain Spirit, right?

Harboring infinite hope, Li Yue collected the light orb rising from beside the corpse into the Demon Illustrated Handbook, ignored Yingying who was endlessly sighing beside him, and carefully studied its effects.

【Material 'Brain Spirit Pituitary Gland', please confirm】

Li Yue furrowed his brow, sensing the effect of the 'Brain Spirit Pituitary Gland,' and the more he thought about it, the more confused he became—the 'Brain Spirit Pituitary Gland' is a material that is only produced after the death of a powerful Brain Spirit. In addition to the Demon Illustrated Handbook being able to directly extract it, humans have also researched many methods to obtain it, and the material itself is a favorite of magicians.

The 'Brain Spirit Pituitary Gland' can effectively enhance the recipient's perception ability, hormone levels, and growth ability. It can be used not only for magicians' magic potions, but even for knights, hunters, and thieves, etc., and is very helpful for individual follow-up development.

In summary, it is a perfect tonic, and it is also one of the favorite standard magic potion materials for nobles—after taking it, it can effectively promote physical development and perception ability, providing great convenience no matter what type of hero you want to become or what special abilities you want to acquire in the future.

But what is this thing... useful for Brain Spirits?

Can it also enhance perception and physical development? What if there is no body?

What is this, eating brains to nourish the brain?

But the problem is... how to eat it?

One question after another arose in Li Yue's mind. He simply tried hanging it behind his brain, but found that it had no effect.

Or... does it need to be 'soaked' in thoughts and forcibly fused?

Li Yue vaguely had an idea and stood there analyzing intently.

And Yingying finally couldn't stay still. Huge light characters almost covered the entire cave: 'You! Are! A! Brain! Spirit!'

'Lord! Already!'

…

“He actually succeeded…” Mentuo’s fingertip had an extra scorch mark, and the 'Rebellion' card in his hand was completely burned, with only a vaguely visible dark black card face and a twisted worm.

"Defeated 'Rebellion'?" Mentuo licked the scorch mark on his fingertip, looking thoughtful. "Either... give it to him? Or wait a little longer?"

Mentuo's fingertip wandered over the 'Rebellion' card, and suddenly snapped it down.

"Rebellion" effect terminated.

Li Yue noticed it but didn't care—at this moment, he was having a deep conversation with Yingying.

“I am not the Brain Spirit Lord, nor will I be the Brain Spirit Lord. I am just an ordinary Brain Spirit.” Li Yue corrected Yingying's wording—after Budiboge died, in addition to the explosion of a large amount of magic power and a 'Brain Spirit Pituitary Gland', there was nothing else that could symbolize 'authority' that was produced. Li Yue sensed himself and didn't find any other changes in his individual, so he determined that he had not yet taken charge of the library or the authority of the Brain Spirits.

“Are all of you Brain Spirits so strong? But the ones who died in the Chaos Gate yesterday were all very weak.” Yingying swayed her body. “Nettemeier just gave them a charming look to bring them 'into the dream,' and they were all controlled…”

“She doesn’t have that much charm…” The shadow trembled, as if muttering in a low voice.

“Maybe outside, she could kill me with a charming look.” Li Yue hadn't been overwhelmed by victory—of the few he had taken the heads of, only the Magic Wolf Finley and the Book Demon were strong kills from the front, with a bit of sneak attack involved; the remaining Budiboge and the three Bosch demons could only be considered finishing blows, taking advantage of their weakest opportunities.

This also gave Li Yue a deeper understanding of the battle between demons—although daring to fight is important, the most important thing is to find the right opponent and the timing to strike.

For someone like Nettemeier, Li Yue could only think of first sacrificing a handsome man to her, and then taking advantage of them having a passionate dream to launch a surprise attack, maybe there would be a bit of a chance of winning…

Wait a minute, why am I planning how to kill Nettemeier?

Addicted?

Li Yue decided that he needed to control his ambition well, and couldn't be too inflated—Budiboge and Bosch's group were all stumbling blocks that had to be removed. Now he could finally live well in the library and develop in seclusion.

But what about the authority of the library? What about Okiboogie's side? Without a Lord of Authority to take care of it, can the library survive?

Will it cause a war like Yingying said…?

Li Yue's thoughts were in a mess—for the first time, Li Yue realized that the mess after winning seemed more difficult to clean up…

Before taking action, Li Yue only knew that if the Brain Spirit Lord was alive, he would have no future; but if the Brain Spirit Lord was really gone, the future seemed even more obscure and unclear?

In other words, how desperate was it back then?

It was the kind of despair that left no time to think about tomorrow.

But things still had to be solved one by one.

Time waits for no one, so he could only move forward.

Li Yue forcibly calmed down, sorted out the problems, and began to plan what to do next.

The first thing was to improve the environment of the library—with that "Fatal Mechanism" and the Bone of Self-Healing, Li Yue felt that as long as he could buy some time, he could use the skillful hands of the Mini-Minies to turn the library into a fortress, turning it into his home field.

And the Brain Spirits resurrected every day could also become a help—Li Yue, who had mastered the Brain Spirit 'Advancement Studies', was undoubtedly their best teacher.

Of course, the premise was to have a way to control the Brain Spirits.

The remaining... the Mini-Minies' diet and training also had to keep up. At the same time, he could "extract" more knowledge in closed combat training, digest more existing knowledge, and fully understand this world in order to find a way out.

Then, there was the most urgent problem—killing Budiboge... who would participate in the upcoming Killing Cup?

The end of the battle was also troublesome, even more troublesome than the 'battle' itself.

Budiboge still had three battles to repay his debts. If he was absent, would there be serious consequences? Would it become a fuse for war?

He could only hope for Budiboge's resurrection…

It would be best to find some good things in the upper level of the library to quickly improve himself…

Huh? Aren't there many 'forbidden books' in the upper level of the library? Where did they go?

Could they all have been blown up by the 'Heart of Purgatory'?

“By the way, when you came in, did you see any surviving books?” Li Yue asked Yingying—at this time, Li Yue's main body was in extremely poor condition, and it was difficult to sense the situation outside the cave through thoughts, so he could only hope for Yingying.

“There are some remnants, all with 'Little Cloak'.” Yingying replied, sighing—as expected of a strong person who killed Budiboge, he didn't show any pride or excitement, only caring about the lost knowledge.

Well, I must study hard in the future.

“I see… then let’s rest and go take a look.” Li Yue really needed time to recover his breath, and felt it was necessary to understand the soul altar of the library and closely observe Budiboge's 'resurrection'.

“Going over there… but…” Yingying seemed to notice something, turned into an arrow, and reminded Li Yue to sense behind him.

Li Yue was extremely exhausted, and of course he hadn't been on full alert all the time. At this moment, seeing Yingying's crisis reminder again, he inevitably panicked, first quickly moved to Yingying's side, and then defended his face with a bone sword before turning around…

Before even turning around, Li Yue understood what was going on—he had previously used the Demon Illustrated Handbook to summon demons from another world, but had not succeeded because of the 'Rebellion' effect. Who would have thought that unlike the Dagger of Decay, the process of summoning the demon would resume after the 'Rebellion' ended?

When his thoughts reached that place, no matter how much Li Yue thought about it, he didn't expect that what was summoned… was actually this.