Being at Hogwarts, something's not right with this system.

Lin Yu didn't know what the problem was.

In short, Hermione suddenly gained the ability to read minds, and it was directed at him.

Even the system couldn't offer an explanation, suggesting that Lin Yu might have interfered with Hermione's original life trajectory, thus causing the impact.

However, Lin Yu felt that with his intrusion, sooner or later his butterfly wings would change the entire plot, and might even destroy it.

Therefore, the system's explanation is completely invalid.

Even now, haven't Ron and Harry been changed a lot because of their contact with him?

But Hermione is the only exception.

The system could only offer a forced explanation: "Perhaps it's because Hermione... Granger's fate is intertwined with yours, which is why you've been affected. After all, you can't possibly marry Harry and Ron, can you?"

Lin Yu: Harry and Ron? Not Harry Xiao Yan Potter anymore?

Hermione blushed slightly. She had heard those words, and she realized she could understand Chinese.

She shouldn't have understood, but she did.

"Alright, I have to go out for a bit," Lin Yu stood up, intending to leave.

It wasn't to avoid Hermione; there were some things he wouldn't admit anyway, and even if Hermione wanted to ask, he wouldn't answer.

Lin Yu really has something to do.

His earlier rejection of the Weasley twins' invitation wasn't entirely to avoid Wood and the Quidditch team's training.

Lin Yu previously obtained a thousand low-grade spirit stones by completing a task, which are still stored in the system space.

He didn't find an opportunity yesterday, but now that he has some time, he wants to absorb some energy and see if he can raise his cultivation level to the second level of the Qi Refining stage.

Lin Yu had seen Quirrell today. He had always known that Voldemort's remnant soul was possessing the back of Quirrell's head.

This gave Lin Yu a slight sense of crisis.

However, Lin Yu never intended to tell Dumbledore about this, regardless of whether Dumbledore had already noticed anything.

In conclusion, fortune favors the bold, and keeping Voldemort around might not be a bad opportunity or a good thing.

As I said before, if the cards are never shuffled, how are new cards ever brought to the table?

And so, Lin Yu left the Gryffindor common room.

Hermione remained seated, watching Lin Yu's departing figure, her chin resting on her hand as she fell into deep thought.

Their fate?

I never expected that she would come here to study and think she would become a witch, but her fate was already sealed?

Recalling what Lin Yu had said in public at noon, Hermione's lips curled into a wide smile.

That's not bad.

Meanwhile, Lin Yu was walking back and forth in the corridors on the eighth floor.

"Where exactly is that Room of Requirement?" Lin Yu muttered to himself as he paced back and forth aimlessly.

It turns out that Lin Yu hadn't forgotten to look for the House of Requirement these past two days.

Actually, on the first day, Lin Yu followed Ron and Harry around aimlessly in search of the Room of Requirement.

Unfortunately, he searched for a long time but couldn't find it; he had searched almost half of the castle.

He was now on the eighth floor, the floor where Ravenclaw's office was located, as well as Dumbledore's office.

The eighth floor also houses divination classrooms, the divination professor's office, and a washroom for male students.

"Just give me a quiet room where no one can find me, that's all I ask for," Lin Yu thought to himself as he continued walking down the corridor on the eighth floor.

Finally, as he walked past the giant stick-beating Banaba tapestry for the third time, patterns slowly appeared on the previously empty wall beside him, followed by the appearance of a door.

Lin Yu turned his head and, overjoyed, quickly walked to the door.

When he pushed open the door, a room that shouldn't have been there appeared behind it.

He finally found it; it was the House of Requirement he had been hoping for.

The Room of Requirement, also known as the Room of Request, is a room that seems to have its own consciousness, and it is very safe.

The Room of Requirement is like an extension of the will of Hogwarts Castle, spontaneously protecting the children in the castle, and even the Marauder's Map doesn't show anything about it.

Even if Hogwarts Castle is breached and occupied, as long as you hide here, you can receive the protection of the entire castle.

Lin Yu was determined to find this house because he didn't want his secret to be discovered.

This is Hogwarts, after all. No secret can be kept hidden in the entire castle. After all, every portrait and picture has its own consciousness, not to mention the ghosts that can be seen everywhere.

Even if you hide in a place you think is safe, you may still be exposed by the liveness map.

Unfortunately, Lin Yu harbors secrets, especially his cultivation of immortality and his connection to the system, which cannot be exposed.

He didn't even want to tell Hermione, which is why he took the opportunity to escape.

Lin Yu pushed open the door and entered the room, only to find it to be a very empty room, with nothing inside, just a room.

Just as he had hoped, it was a clean and tidy room with nothing in it.

Lin Yu nodded in satisfaction, then turned and closed the door to prevent anyone else from coming in.

When the door to the Room of Requirement is closed, it becomes impossible for anyone outside to find it; otherwise, Harry and the others in the original story wouldn't have used it as a secret base for Dumbledore's army.

Of course, he won't be trapped here. He can still open the door from the inside and leave at any time.

Then Lin Yu took out a thousand low-grade spirit stones, which he spread all over the ground.

This is twice as much as the previous five hundred low-grade spirit stones. Luckily, he didn't take it out of the train's toilet, or he would have been overwhelmed.

With so many spirit stones, Lin Yu took a deep breath, as if he could feel the air itself change.

"Let's see if I can improve my cultivation level," Lin Yu said without hesitation. He sat cross-legged on the pile of spirit stones, closed his eyes, and began to circulate his cultivation technique.

As the Devouring Heaven Divine Art was activated, the spiritual energy in the spirit stone beneath him began to be drawn out and then entered Lin Yu's body.

Lin Yu felt as if he were in a sea of ​​spiritual energy, with a vast amount of spiritual energy entering through his pores and acupoints, circulating through his meridians, and flowing into his dantian.

As spiritual energy continued to flow in, the energy within the dantian became increasingly concentrated.

Finally, Lin Yu seemed to sense something. He frowned until some kind of constraint was broken, at which point his brows relaxed.

"I succeeded," Lin Yu slowly opened his eyes. He knew that he had successfully advanced to the second level of the Qi Refining stage, and the spiritual energy in his body had directly doubled.

At the same time, Lin Yu looked down and found that all one thousand low-grade spirit stones had turned into ordinary stones, devoid of any spiritual energy.

"It was five hundred before, and it's a thousand this time. Does that mean it will cost two thousand next time?" Lin Yu muttered to himself.

It doesn't seem like much, but what if we extrapolate from that?

The first level of Qi Refining costs 500 coins, the second level costs 1,000 coins, the third level costs 2,000 coins, and the fourth level costs 4,000 coins.

Isn't this exponentiation?

Also called exponentiation, or more familiarly, two to the power of something.

If this continues, things will get complicated.

Many people have probably heard the story about a single grain of rice. One grain is given on the first day, two on the second, and so on, doubling the amount each day until eventually, the amount can't even cover the size of a chessboard.

The chessboard has sixty-four squares, and two to the power of sixty-four is already quite intimidating.

Lin Yu was a little dumbfounded.

Because he did a simple calculation and found that 500 multiplied by 2 to the power of 9 equals 256,000.

Could it be that he needed so many spirit stones when he reached the Great Perfection of the Qi Refining stage?

"Fortunately, I still have a reward that allows me to directly advance to a higher realm," Lin Yu thought to himself, thankfully he had kept that reward.