Dumbledore awkwardly took off his glasses and wiped them repeatedly.
"No need to pay attention to these details."
"...By the way, I still don't know who this old man who suddenly appeared is," Kaisen asked, scratching his chin.
"Gellert Grindelwald," Grindelwald said, straightening his back slightly.
".....Who?"
".....You....don't read history books about the magic world?" Grindelwald's eyebrows furrowed.
"I've read some unofficial histories, but mainly during the time of the four Hogwarts founders."
"Alright Gellert, you also said that we are old now, and there's no need for every Wizard to remember us," Dumbledore said, trying to smooth things over while stifling a laugh.
"Why did you call me here?" Kaisen asked.
"To ask you about some things from the future," Dumbledore said.
"Ah? Oh...ask away."
"That person is..."
"Me nine years from now."
Dumbledore nodded, "So, just as Gellert said, it's because of that plan to give everyone magic?"
Kaisen looked at Dumbledore in surprise, "Don't tell me you were persuaded by him."
"Consider it satisfying a Professor's curiosity. I know enough now. Thank you for coming here," Dumbledore said with a smile.
Kaisen's brain uncharacteristically froze for a second, but this time he didn't raise his middle finger. After all, the old man named Grindelwald looked like Dumbledore's old friend.
Giving the Principal some face wouldn't hurt.
The next day...
Kaisen sat up from his bed in a daze, with no intention of putting on slippers, planning to go barefoot. Then he stepped on something warm and soft.
"Woof woof woof...."
Sirius lifted his head, utterly confused, with a big look of bewilderment on his small dog face.
"Ah...you had a nightmare, didn't you? It's okay, it's okay, go back to sleep, go back to sleep." Kaisen awkwardly patted the dog's head and made him lie back down on the wool mat to continue sleeping.
Kaisen himself went to the washroom for a cold shower, which was quite stimulating in the dead of winter.
After getting dressed, he checked his watch. If nothing unexpected happened, the Little Wizards should already be in the classroom, ready for class.
He straightened his collar and appeared in the Alchemy classroom in the blink of an eye.
"Our progress has started to fall behind!"
The Weasley Twins raised their hands simultaneously.
"Speak."
"But Professor, the entire fourth year is in one classroom, how can we fall behind?"
"You've fallen behind Cedric, who is also in fourth year, how about that?" Kaisen said as he personally closed the front and back doors of the classroom tightly.
The Little Wizards in the classroom, seeing Kaisen like this, immediately realized what Kaisen was going to do, and their eyes lit up.
"I still haven't forgotten my promise to you. These are the last few classes of this semester. If I don't teach you now, you'll probably have to wait until next semester."
As he spoke, he took out an enchanted ender pearl and lightly tapped it. The power to confine space spread from it, ensuring that Dumbledore's Phoenix wouldn't be able to enter within five hundred meters above and below this classroom...
Unless he walked in.
"Alright Little Wizards, who can tell me what course I'm going to teach?" Kaisen asked.
"Wither!" a Gryffindor Little Wizards shouted loudly, his hand raised high, before Kaisen even called on him.
"Mm-hmm, tell me what this thing is for."
"It has a very powerful repellent effect on undead creatures."
"Yes, the repellent effect on undead creatures is very obvious, but I still need to explain the principle behind it. Theoretically, a complete Wither, which is a Wither made using 4 cubic meters and three normal Decay Skulls, has no repellent effect on undead creatures, because the Wither is the most powerful undead creature."
"However, the Withering Charm I'm teaching you is a calcium-deficient, small version of the Wither. This type of Wither is still the most powerful undead creature, but because the Wither's growth is incomplete, he will be very eager to devour other undead creatures to strengthen himself."
"The principle of the Withering Charm is the Wither's deterrence against undead creatures, and a high-pitched sound that humans cannot hear to repel undead creatures. And the scope of this undead creature is also very wide."
"Including but not limited to...." Kaisen paused shamefully here. He quickly pulled out the Dark Arts creature manual that Lupin had given him last time from his ring and quickly flipped to the chapter on undead creatures according to the table of contents.
"Including but not limited to Ghouls, Inferi, Zombies, banshees, Dementors—these are all within the Withering Charm's expulsion range. So, theoretically speaking, theoretically, I absolutely do not mean for you to put it into practice."
"Theoretically speaking, as long as you wear this Withering Charm, even if you go to Azkaban for a team-building exercise, your laughter could blow the roof off Azkaban, and those Dementors wouldn't dare to approach within fifty meters of you."
After Kaisen finished speaking, he saw the Little Wizards whispering below. He was genuinely afraid that these Little Wizards would develop some strange and bizarre ideas after listening to his lesson.
To dispel their thoughts, he quickly picked up the Dark Arts creature manual again and started to change the subject.
"One more thing!"
"The Withering Charm also has a repellent and deterrent effect on ghosts and Thestrals, and because the so-called repulsion and deterrence is the Wither using high-pitched sounds that humans cannot hear to make undead creatures feel pain, I sincerely hope that you do not reveal the charm when you encounter Hogwarts ghosts and the Thestral carriages on your way from Hogsmeade Station to Hogwarts."
"Uh... Professor, what does this have to do with the carriages we ride?" Angelina asked, raising her hand.
"Thestrals, according to books, are creatures that cannot be seen by people who have not experienced death and have a certain understanding of death. And the carriages you ride are pulled by Thestrals. I'm not a professional in this area, you can ask Professor Snape. He's still teaching you Defense Against the Dark Arts, isn't he? He's a professional."
"Alright, enough with the chatter. Of course, I can't just have you start from creating a Wither... Let's start with the casing of the Withering Charm. Take out obsidian, gold, mithril, a chain, and an Enchanting Table...."
Weasley Twins: "Gold???"
After class, Kaisen returned to his office feeling refreshed. He leisurely took out the Newborn Magic Art manual that Minister Kaisen had given him and started reading it.
In a while, this semester would be over again, and he needed to find something to do for himself.
Like researching his new module.
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