In the afternoon, after finishing his cultivation and having nothing to do, Gray went to the library.

In the library, he has already read all the books related to the common sense of the mainland, but as for other miscellaneous books such as travelogues and biographies, he is not very interested, so he does not go to the library as often as before.

Gently pushing open the door to the library, Gray looked in the direction of the white round table on the right side of the library.

Not to his surprise, Caroline was sitting quietly, holding a book and reading it with relish.

She was dressed in a blue pleated group, her legs were elegantly folded together, her long brown hair was tied into a ponytail, and her blue eyes were staring closely at the words in the book, and her face occasionally showed a look of sudden realization.

Unlike Gray's rough way of reading books with a strong purpose, she prefers to study the sentences and words in the book word by word, and read them in more detail than Gray.

Next to the round table, in addition to Caroline, there was another person.

This person was wearing a white pleated long dress, with a well-proportioned face, fair and delicate skin, and long golden hair, which was spreading out at this time, draped behind him, and a cool breeze blew in from the window, and the blonde hair fluttered slightly.

This person is Poli, of course.

Gray's entry immediately made Caroline and Polly notice, and both of them raised their heads to look at Gray.

Caroline nodded slightly, and Polly was slightly curious.

"Why are you here?"

In the past few days of coming to the castle, she has not seen Gray come to the library, and suddenly she can't help but be slightly curious.

As soon as he heard the other party's words, Gray immediately guessed that in the eyes of this person, he might have formed the impression of "no learning and no skills" and "no chance with books", he didn't explain, shrugged his shoulders and said.

"It's a bit idle, so I'll just come and find a book!"

"Understood, do you need me to recommend you?"

Polly said to Gray with a look of "I'm better known than you".

"Well, no."

Gray rolled his eyes.

How many days has this eldest lady lived at Fergus Castle? I only went to the library a few times, so how could he be familiar with the books in the library?

This eldest lady is not polite, and she actually has the courage to recommend books for him.

"You're welcome."

Although Caroline was the most familiar with this library among the people present, she knew that Gray and Caroline were not the same father and mother, and their relationship might not be good, so Polly took the initiative to take over the "heavy responsibility" of recommending books to Gray.

"I really don't need to."

Gray was embarrassed, he was really not polite.

He came to the library just to pick a book he wanted to read, and if he asked Polly to recommend it, it was what he wanted to read, and if he recommended the kind he didn't want to read, and it was hard to refuse, then this afternoon, he would probably be depressed.

"Okay, if you can't find a suitable one, let me know, and I'll recommend it to you."

Seeing Gray's repeated refusal, Polly had no choice but to nod.

"yes, okay."

Gray finally breathed a sigh of relief in his heart.

At this moment, Caroline raised her head, first at Polly, and then at Gray with a strange gaze.

Seeing the other party's gaze, Gray cast a "dissatisfied" gaze, complaining that the other party did not explain for himself, but Caroline smiled slightly at the corner of her mouth, and then immediately lowered her head and looked at her book.

Seeing how the other party was, Gray couldn't help but wonder, he didn't expect that his sister would have such a "demonic" side.

After finding the bookshelf where the blood method was stacked, and after some selection, Gray found a book called "The Mutation of the Blood Beast".

With the book in hand, Gray went to the white round table, pulled out a chair, and sat down.

Turning the pages of the book, I was just about to flip through it, and immediately smelled a faint fragrance coming from the side.

When he turned his head sideways, he saw Polly not far away, looking at him with her body turned to his side, and a strand of blonde hair slid down on the white round table, and it was as smooth as a golden thread.

"You like these kinds of books?"

Polly said with a wrinkled nose.

"Well, I'm curious about blood beasts."

Gray nodded.

His transformation ability is related to the blood beast, and only the blood of the blood beast can promote his transformation, so he wants to store as much knowledge about the blood beast as possible.

"Curious about what?"

Polly couldn't help but ask.

"Curious about their strange abilities, as well as the bloodline evolution and bloodline deterioration that happened to them."

Gray thought for a moment.

"Well, there are a lot of these books in Sidney Castle, well, if you go to Sidney Castle next time, I'll show you there."

"Thank you very much!"

Gray thanked him.

It is certain that the Sidney family library was larger than the Fergus family library, and there must have been more books, and perhaps a similar description of his present situation could be found in these books.

After a few words, the two ended their conversation and began to read their books.

As the pages turned, Gray couldn't help but be drawn to the contents.

"The Mutation of the Blood Beast" is a book that introduces the mutation phenomenon that occurs in the blood beast, and the mutation, simply put, is the change of a certain aspect of the ability of the blood beast.

For example, the strength is stronger than that of a blood beast of the same kind, for example, the speed is faster than that of a blood beast of the same kind, and it is like a faster recovery speed than a blood beast of the same kind......

There are many types, of course, there are not only good mutations, some mutations will have a bad impact on the blood beast, such as it seems to be weaker than the same kind of blood beast, and the ability of the blood beast is weaker than the same type of blood beast......

The entire book is devoted to documenting this phenomenon and publishing the author's own speculations about this phenomenon.

"Mutation is an incomplete form of bloodline evolution and bloodline deterioration?"

Before he knew it, Gray was already holding his chin in one hand, thinking about the author's speculation.

According to the book's author, the mutated blood beast is a special case formed by the incomplete evolution of the bloodline and the deterioration of the bloodline.

To put it simply, when the bloodline evolves, only some of the characteristics have evolved, but some of the characteristics have not evolved, making this blood beast stronger than the blood beast of the same kind, but not as good as the higher sequence blood beast.

The same is true when the bloodline is degraded, some of the physical characteristics have been degraded, but some of the physical characteristics have not deteriorated, resulting in this blood beast being weaker than the blood beast of the same kind, but stronger than the blood beast of the lower rank.

"Really?"

Gray raised an eyebrow.

The author's view of this book is very different from the understanding of variation that he developed in his previous life.

According to the previous life, mutation is the difference in morphological characteristics, physiological characteristics, etc., between generations of organisms or between different individuals of the same generation.

But if according to the author of this book, the mutation is directional, either approaching the high-sequence blood beasts or approaching the low-sequence blood beasts.

Because the direction has been fixed, to some extent, this can no longer be called variation, after all, the main characteristic of variation is random, without direction.

This view ...... There are questions, but I know too few examples of mutations, and I have never even been exposed to them......"

Gray shook his head, adhering to the common sense formed by the mutation in his previous life, he did not agree with the opinion of the author of the book.

However, the mutations he knew about were only seen from books and had not really been experienced, so he could not come up with strong evidence to deny the other party's view.

As for the mutation of the blood power recovery speed on his own body, it is just a fake, and the recovery speed of his blood power is not much different from Bernal and others, and the reason why he is considered so by Viscount Fergus is entirely because he has the strength characteristics of the Cold Tiger and does not use the blood power in the battle.

Time passed unconsciously, and soon it was getting late, and in the evening there was already a servant who had come to inform him and go to dinner.

Gray stood up with Caroline and Polly and walked towards the restaurant.

Follow the stairs on the second floor to the lobby on the first floor, and then from the lobby to the left, through a passageway, you will come to the entrance of the restaurant.

Green looked casually into the restaurant, and the next moment, his heart suddenly pounded, and cold sweat slid down his forehead.

In one corner of the dining room, blocked by a standing cabinet, where shadows appeared, a vague figure half-crouched, appeared there.

Servants came and went in the dining room, some of them passing less than half a meter from the figure, but none of the servants noticed the figure, as if only he could see it.

The answer is already obvious, the other party must have used some kind of ability to hide in the shadows, hiding his body in the shadows, so that others can't see him at all.

And the reason why he was able to see the other party was naturally because of the infrared perception he gained after swallowing the blood of the shadow snake.

The body can be hidden in the shadows, but the infrared rays emitted by the body obviously cannot be hidden, so it is seen by Gray.