Hogwarts Passer-By Professor

Since Eisen has perfectly mastered the phantom invisibility, he can freely travel around Hogwarts.

Since he has initially mastered the ability to transform between elements, the purpose of Eisen coming to the Black Lake is to further master this ability.

Perhaps related to the in-depth study of the knowledge of human body deformation some time ago, Eisen found that the difficulty of transforming shapes between elements has been greatly reduced.

This time, when he came here to practice transfiguration with other spells, Eisen found that it was really as he thought, and the changes between various elements were very easy.

Of course, Eisen's experiment this time is only to master the changing ability between elements more proficiently, not the attack strength. So he didn't show his offensive and destructive power.

For example, if he hadn't intentionally controlled the transformed windblade tornado, it would have swelled out of control. As for the transformation into a fire tornado, Eisen actually felt that there was a lot of room for it, and he could even turn it into a fire tornado.

But obviously, Eisen did not need to directly expose this destructive power.

Of course, the reason why Eisen stopped was because he had spotted the trio sneaking here from the perspective of God observing the characteristics.

Because Eisen has God's perspective on all the time, he can safely experiment with the methods he has mastered without fear of being known.

So, what happened next surprised the trio.

When they came to the Black Lake, they found that Professor Eisen was not observing the Black Lake, but looked directly at them, as if he knew they were coming here, and was waiting for them here.

"Uh—professor!" The three looked at each other, suddenly showing embarrassment. In the end, Harry bit the bullet and stepped forward to say hello.

"You don't go to dinner, what are you doing here?" Looking at the trio in front of him, Eisen suddenly felt speechless.

"That's right, Professor Eisen, I want to go to the library to borrow a book, hoping to learn some knowledge about potions from it." Hermione looked at Eisen and said with a little embarrassment, "But, this book is in the Restricted section of the library, so I need a teacher to sign the slip—"

After speaking, Hermione held out a note to Eisen. Seeing Eisen looking at her, maybe he felt that he was too ashamed to lie, so that his face turned red immediately after speaking.

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Seeing Hermione's slightly embarrassed look, Eisen suddenly didn't know what to say.

Theoretically, after any teacher signs and approves the students, the students can borrow books in the restricted area. But whether an astronomy professor's signature would work, Eisen wondered.

"I have to remind you that the restricted area is too dangerous for sophomores." Eisen solemnly warned after signing the note with a quill.

"I see, Professor Eisen!" Hermione took the note and nodded softly. On the other hand, Harry and Ron, seeing that Hermione had already obtained the signed note from Professor Eisen, immediately revealed a tinge of joy.

"By the way, why don't you go to Professor Lockhart to ask for a signed approval slip. His signature, a professor of Defense Against the Dark Arts, should be more appropriate." As if thinking of something, Eisen asked quickly.

"Uh—" The three of them looked at each other, the smiles froze on their faces, and then told Eisen what happened during this period.

It turns out that Lockhart's approach to class has completely changed since his escape from the Cornish elves.

Originally, Lockhart would bring some creatures to teach the students how to actually fight, which still fits the positioning of the Defense Against the Dark Arts course, but after screwing up once, his class content became a recitation of his own masterpiece.

Lockhart would read long passages from his books to students in class, sometimes even acting out dramatic passages. This caused Harry to complain in every Defense Against the Dark Arts class.

Because, Lockhart likes to ask Harry to play the characters in his book, such as the villager cured by Lockhart, the Himalayan snowman with cold, vampire and so on.

These experiences were a nightmare for Harry. But there was no way, who let Lockhart be the professor of Defense Against the Dark Arts, so Harry could only endure it.

Obviously, judging from the inside and outside meaning of the trio's words, if they go to Lockhart to sign the approval slip, they may have to be tortured by Lockhart again. So instead of looking for Lockhart, the trio figured it out and came to Eisen instead.

After listening to the speeches of several people, the corner of Eisen's mouth couldn't help twitching. This—is Lockhart about to be exposed? Complaining in his heart, he sneaked a glance at Hermione, and found a slightly depressed look on Hermione's face.

Obviously, Hermione at this time was also wondering why Lockhart would do this!

"By the way, take out the cards I handed to you!" Then, Eisen stretched out his hand to the three of them.

The three of them were taken aback for a moment, but then they thought of something, and they took out the poker marked with "∞" and put them in Eisen's hands.

Speaking of which, Eisen had secretly used cards to launch transfiguration to help them. But at this moment, he has to make some changes.

After receiving the three cards, Eisen pointed with his wand, and then waved his hand, a beam of light divided into three and landed on the three cards. The "∞" imprint on it immediately shone brightly, and then calmed down and returned to its original state.

"Remember to wear it close to your body, and don't put it in the storage ring." After handing it over to the three, Eisen gave a serious warning. Seeing the three people putting away their cards and nodding, Eisen didn't forget to remind them, "If you encounter any danger, you can say the password 'protect your body', it can help you!"

"Thank you, Professor Eisen!" The three replied in unison, with joy on their faces.

"Okay, I won't deduct points for Gryffindor this time, but I think you should know that students of your grade, it's best to return to the Gryffindor lounge obediently after eating. Don't think about where to go for a night tour all day long. Where are you going to take risks!" Seeing the excitement of the three, Eisen poured cold water on their heads.

Harry and Ron froze, and Hermione stuck out her tongue. Afterwards, the trio walked in the direction of Hogwarts Castle in a gray manner.

After Halloween, as the new season of Quidditch matches was about to start, Harry had to devote part of his energy to Quidditch training while studying.

But due to the tight schedule, Harry had already compressed the time of Quidditch training a lot. This made Wood blame Harry a lot.

On Friday morning, before the other students woke up, Hermione came to the library with Eisen's signed note.

The library was eerily quiet and dreary. Mrs. Pince, the librarian, is unusually sensitive when dealing with students.

"Strong Potion?" After snatching the note from Hermione, Mrs. Pince muttered and looked at her suspiciously. Hermione almost couldn't breathe under the pressure of being watched.

But as soon as she thought that it was Professor Eisen who personally signed and approved the note, Hermione suppressed the discomfort and looked over at Mrs. Pince's eyes.

After examining it, Mrs. Pince did not find it to be a forgery. Then, she walked between the bookshelves, and after entering the restricted section, she returned to Hermione within a few minutes.

Mrs. Pince didn't say anything, and handed Hermione a heavy, moldy book. It seems that the astronomy professor's signature is also very useful. Thinking this way, Hermione breathed a sigh of relief, quickly put the book away and put it in her bag, and left the library as if nothing had happened.