Hogwarts first-year students couldn't even be considered true wizards.

For a long time, not just at Hogwarts, but throughout the entire wizarding world, this was the prevailing belief.

Because compared to their sometimes-working, sometimes-not magic, when conflicts arose, dropping their wands and lunging at their opponents was often a more common and effective way to "reason."

However, after just one Defense Against the Dark Arts (or, more accurately, Magical Combat) lesson, a door to a new world suddenly opened before the students' eyes.

"Whether it's dark magic or white magic, it's actually an inaccurate way of putting it,"

Grindelwald said slowly, weaving through the students practicing in teams, his voice just loud enough for the whole class to hear.

"It's simply judged based on the results it produces and the most common usage."

"Fiendfyre can effectively repel Dementors, vampires, and dozens of other dark creatures that fear sunlight and high temperatures; while the Levitation Charm, if used with malicious intent, is enough to take a human's fragile life..."

"Hm... Miss Hermione Granger, do you have a question?"

Grindelwald raised his eyebrows, glanced at the girl with her hand raised, and turned his head to ask curiously.

"Professor Apocalis, your explanation is different from what's in the books."

Hermione looked at Grindelwald with a serious expression and bit her lip as she quickly said,

"Dark magic, it's a collective term for those dangerous magics, some of which have characteristics different from most magic, are intensely harmful to humans, lack effective counter-curses, and whose release violates normal morality..."

"A very meaningful question. Indeed, what's in the books isn't entirely wrong—for mediocrities."

Grindelwald grinned, and casually pointed his wand at the wall behind the classroom.

"Riddikulus!"

*Boom!*

A dazzling white light sliced through the air.

Accompanied by a roar, a terrifying crack appeared on the solid castle wall.

"Miss Granger, this is a simple spell used to combat Boggarts, its only purpose is to transform it from an unpleasant appearance into a ridiculous state... However, with the blessing of sufficiently powerful magic..."

Grindelwald pointed to the crack in the wall, the corners of his mouth slightly raised.

"I can tell you with certainty that this spell can easily take the lives of everyone in this classroom, well, or most of the students."

"And on the other hand, the dark magic Fiendfyre I mentioned earlier..."

Without any incantation, a wisp of faint flame appeared on Grindelwald's fingertip.

"*Whoosh~*"

Grindelwald gently blew a breath, elegantly extinguishing the flame.

"Now, let me tell you all a simple and easy-to-understand fact, but one that is often forgotten."

"Any behavior that begins to discuss the danger and practicality of a spell without considering the actual scene and the magic power used by the spell-casting wizard is meaningless nonsense—Fiendfyre can effectively remove termites from the castle, and the Bubble-Head Charm can make people die particularly ugly."

Surveying the little wizards in the classroom who seemed to understand, Grindelwald was in a rather good mood.

Compared to those selfish, foolish, and stubborn adult wizards, these children, like blank sheets of paper, are the future of this world—through years of solitude in Nurmengard Castle, Grindelwald had gradually realized his biggest problem: he was too eager for change to appear.

"Remember, magic is just magic."

Grindelwald shrugged and said with a gentle smile.

"Magic only blooms in very few souls, children. First..."

"Cough cough cough!"

Just then, a somewhat abrupt coughing sound came from the classroom door.

Grindelwald stopped lecturing, turned around, and a trace of helplessness appeared on his face.

"Ah... Professor Dumbledore, if I'm not mistaken, it should be class time now?"

"My apologies, Professor Apocalis."

Dumbledore stood in front of the Defense Against the Dark Arts classroom door and lowered his head slightly to express his apology.

Then, the old wizard, as if he didn't understand the dissatisfaction in Grindelwald's voice, not only didn't leave, but walked straight in, came to the end of the classroom, and carefully examined the cracked wall.

"I happened to hear some unexpected noises when I passed by, so..."

Dumbledore drew his wand and casually tapped the wall, and the broken stone powder returned to the wall as if time had reversed. The crack blasted out by the magic quickly healed until it disappeared.

"And, may I be allowed to sit in and listen for a while? There is absolutely no questioning of your magical knowledge. I'm just a little worried whether these first-year children who have just come into contact with magic...can understand what you're saying."

"...Heh."

Looking at the familiar fake smile on the old face in front of him, Grindelwald's eyebrows twitched in disdain.

After so many years, how could he not know what Dumbledore was thinking at this time?

He had only habitually said a few lines from his speech in the cemetery, and this old fellow had rushed in nervously, lest he take this opportunity to re-promote his former ideas—the same thing had happened several times in the past few days in class. The previous few times, he only created a little magical fluctuation outside the classroom, but this time he simply barged in.

"Of course, you are the Headmaster of Hogwarts, everything is up to you."

Grindelwald snorted unhappily, his wand twirling in his fingers.

"And I remember that you were notified of the changes to the curriculum before, Professor Dumbledore."

"Don't misunderstand, this is not an order from the Headmaster."

Dumbledore smiled slightly, conjured a wooden chair out of thin air, and sat down at the back of the classroom—obviously not planning to leave.

"This is just a Defense Against the Dark Arts professor, curious about the latest changes in the direction of this course, you can just treat me as a special student."

"Student? Okay."

Grindelwald glanced at the old wizard who was staying in the classroom and raised the corners of his mouth, revealing a playful smile, turned around and looked at all the students, and continued from where he had been interrupted.

"First, I need to ask you all a question, what is the strongest magic in the world?"

The students looked at each other, their expressions hesitant.

Because Dumbledore was sitting in the back of the classroom, the little wizards were a little restrained instead.

For a time, the classroom fell into an eerie silence, and after a few seconds of silence, Hermione was the first to raise her hand again.

"Avada Kedavra, the Killing Curse. You said that this spell cannot be resisted, cannot be interrupted... More importantly, the former Dark Lord used this magic to kill countless wizards and become the most terrible dark wizard in modern magical history."

The most terrible... dark wizard?!

"Voldemort? Heh." (When this name was mentioned, the children from wizarding families all shuddered.)

Grindelwald recalled the black shadow that had been scattering soil slag all the way a few days ago, a flash of sarcasm flashed in his eyes, and shook his head.

"Dark Lord? It's just self-proclaimed, in my opinion it's just a young man abusing the Killing Curse, he doesn't even understand what he's doing. And the facts have proved that the Killing Curse is not completely unstoppable..."

Hearing this, all the students subconsciously turned their heads to look at Harry sitting in the corner of the classroom.

Obviously, the person who successfully resisted the Killing Curse in Grindelwald's mouth was this Savior who had hardly had much presence since entering Hogwarts—although for Harry himself, this was not a bad thing.

However, with Hermione's answer being rejected, the whole class once again fell into silence.

"It's a pity that such a simple question, no one can answer it."

Grindelwald shook his head, pretending to be regretful.

The old wizard looked at the quiet classroom, a smug smile appearing on his face, and was about to reveal the answer.

You know, although it was a temporary crash course, Grindelwald had indeed prepared the lesson plan properly. Otherwise, Dumbledore and the professors of the school would not have allowed a strange wizard to directly take over such an important main course.

However, just then, a voice that made one's head hurt suddenly popped out.

"Um... Healing magic? Or, runic magic?"

"Ehhhh..."

The smile on Grindelwald's face froze subconsciously, he turned his head to look at the white fluffy ball raising its hand with a naive expression, and suddenly felt a faint ache in his left shoulder. This kid, wouldn't be implying something, right?

"This...well..."