At eight o'clock in the evening, Harry pushed open the door of the Ancient Rune Office on time.

"Find a place to sit." Felix said as he sat on the chair behind the desk. He was reading a paper. Harry looked around, and the sniffing Valen beside him pointed to an armchair on Harry's left.

Harry whispered a thank you to Valen, moved the chair, sat opposite the professor, and waited quietly. After two or three minutes, Felix put down the paper in his hand and smiled: "You may be curious about the reason why I asked you to come. It's actually very simple. I was commissioned by Headmaster Dumbledore to teach you the brain block."

He briefly introduced: "This is a spell to prevent the mind from being invaded by outsiders."

"Why do I have to learn this thing?" Harry said blankly. The next second his heart began to pound. He thought of the reason and said with difficulty: "Is it because of the nightmare I had?"

"As far as I know, this is not the first time?" Felix asked softly.

"I, uh, yes, there was another time during the summer vacation." Harry had to admit. "But,"

he looked at Felix eagerly, "Sirius said it might be related to my scar. In my first year, Headmaster Dumbledore also said that Voldemort's unsuccessful killing curse connected me to him."

Felix shook his head and whispered, "That's barely true."

"From what I can see so far, it's only you who is spying on Voldemort's thoughts unilaterally. This may be because he is not strong enough and has not noticed your little tricks, but..." He stopped and looked at Harry.

With a long-standing tacit understanding, Harry followed Felix's train of thought and thought about it. A terrible idea was deduced. He couldn't help swallowing his saliva, "Do you think Voldemort might spy on my thoughts in turn? This, this is really..."

It doesn't seem to be a big deal, Harry thought blankly. He is just a student who worries about completing homework for different subjects every year. If Voldemort really saw these thoughts, he would probably be very impatient.

"Don't underestimate your position in Voldemort's heart, Harry." Felix said calmly: "You destroyed his dark rule with your own hands. If there is anyone he hates the most and cannot understand the most, that person is most likely you, otherwise he would not arrange the most trusted servant to sneak into Hogwarts and risk your name in the Goblet of Fire..."

At this point, he looked at Harry thoughtfully.

This reminded him that Voldemort was seriously short of manpower. His first priority was to arrange the resurrection, not to make trouble in Hogwarts and expose his existence, even though Voldemort was eager for Harry to attend his rebirth party.

Unless Harry's role is more important than imagined, and even directly determines the success or failure of Voldemort's resurrection...

"Professor? Professor Hepp?"

"Sorry, I was a little distracted. In addition to what I just said, you also know a lot of valuable information for Voldemort, such as the movements of Headmaster Dumbledore, or some close people around you, or... Horcruxes. You don't want to expose these, right?"

Harry's expression was very tangled. On the one hand, he wanted to enter Voldemort's mind again, especially since Voldemort now had a capable subordinate, and it was the critical time for him to seek resurrection; on the other hand, he certainly knew the risks involved.

"Then you teach me the brain, big," Harry said, and Felix glanced at him, "It's the brain block." Harry hurriedly said, "Yes, the brain block. Do you want me to cut off contact with him? To prevent the leakage of our information?"

Felix did not comment.

"So what do you think?"

"My opinion?" Harry asked in confusion.

"Do you agree to learn the brain block?"

"Can I refuse?" Harry looked at him and asked in a low voice.

"Of course I respect your choice. It's not easy to force such a thing."

Harry laughed, "It's good to learn more knowledge, professor." He felt that he was very much like Hermione in this sentence.

Felix knocked on the table, and the perspective changed silently. All the color decorations in the office turned gray and white, leaving only some magical items that glowed with magical light. He stared at Harry, making Harry uncomfortable.

"Since you've decided," he straightened up, "let's start now."

Harry stood up and unconsciously searched for a place to sit, hoping to find a mat or something on the ground. Then he found Professor Hepp looking at him strangely, "What are you thinking about?"

"Uh... Professor, don't we need to put a mat on the table?" Harry gestured, "We'll use it in the duel study group..."

Felix looked at him and breathed a sigh of relief, "It seems that you don't know much about this knowledge." He waved his hand, and a piece of parchment and a quill on the table flew up automatically. The blue quill was inserted into the ink bottle, dipped in ink, and wrote down a list of book titles "Swishing". Harry was frightened watching from the side.

When the list of books floated in front of him, he took it in a trance and stared at it for a few seconds before he could see the first title "Lock Your Brain", followed by a long list. Harry was very depressed, as if he had scored a zero in the second project.

"This is the reference book you will read when you go back," Felix said, "I will briefly introduce this knowledge."

"Speaking of Occlumency, we have to mention Legilimency, Oblivion, Mind Cabin and a series of other magics," Felix gestured to Harry to sit on the sofa, and sat opposite him, then took out his wand, and with a light wave, the fire in the fireplace began to burn.

"They are all classified as memory magic, but in fact they are very different. Among them, Occlumency and Legilimency are the most closely related, but they are also opposite to each other."

"Professor, what is Legilimency?"

"In a way you can understand, it is similar to what people generally call mind reading. It is a kind of magic that invades the other person's brain and reads feelings and memories. Of course, I must emphasize that Legilimency and mind reading are very different. I want you to read the book to understand the specific concepts, reflect them in your thesis, and you must analyze the difference between the two."

Harry felt a little bitter at the corners of his mouth.

But he suddenly realized something and asked hurriedly, "Professor, do you want to read my mind and let me use brain blockage to defend myself?" He felt uncomfortable. If the professor saw any secret memories, he would definitely be angry.

"This is just one of the methods." Felix commented, "An efficient strategy to speed up your mastery of brain blockage through actual attack and defense at the mental level. But to be honest, we still have plenty of time. At least we don't have to worry too much before Voldemort is resurrected. Of course, if you are in a hurry to learn it..." Felix looked at him with ill intentions.

"I'm not in a hurry." Harry said quickly, "I'll choose other methods."