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As a revolutionary leader who almost overturned the entire magical world, Gellert Grindelwald is no stranger to large-scale personnel deployments and strategic deployments at the macro level.

Even after half a century, when the aging first-generation Dark Lord reunited with his no-longer-young followers, their compatibility remained as tacit as it was back then – even more fluid and efficient than in the past.

Having experienced the baptism of time, these once naive and reckless idealists have matured.

Although the number has shrunk by more than half compared to the past, almost every one of the saints who have reassembled around Grindelwald today has the ability to independently support a self-operating small stronghold.

This is also why Grindelwald can so confidently decentralize the work to everyone.

Compared to himself, who was self-imprisoned in Nurmengard Castle, these old buddies who had been living incognito in the non-magical world for decades had long surpassed him in terms of dealing with people and haggling with Muggles.

But even so, by the time Gellert Grindelwald completed all the task assignments for the "Soviet Strategy" and returned to Hogwarts School of Witchcraft and Wizardry, it was almost midnight.

Hogwarts Castle had long since fallen into a dream.

Except for the Headmaster's office on the top floor, which was still lit, the rest of the castle was dark, and even the light in Hagrid's hut near the Forbidden Forest had gradually dimmed a few minutes ago.

*Pop.*

The fireplace in the Headmaster's office crackled softly.

Then, a slightly tired and aged voice came out.

"Sorry, Albus, I'm a little late getting back."

Dumbledore, who was poring over the parchment in his hand, looked up, a sincere smile on his face, and looked at Grindelwald, who was leaning out of the fireplace.

At this time, the first-generation Dark Lord had returned to his original appearance.

"Yes, I received your short message."

Dumbledore pointed to a note on the table, looked at his tired old friend, and smiled softly.

"Looks like everything is going smoothly? I originally thought I might have to wait another quarter of an hour before you could get away from there, you really are still..."

"This is not my credit."

Grindelwald shook his head noncommittally, flicked his wand nimbly beside him, removing the fireplace soot from his body while casually replying.

"They are no longer twenty or thirty-year-olds. I just need to tell them the goal, the main path to achieve the goal, and the precautions. As for the rest, they are better at handling it than I am."

"However..."

Grindelwald unbuttoned his robe and hung it casually next to Fawkes' bird stand, his gaze swept across Dumbledore's desk, and finally fell on the row of light brown glass medicine bottles on Dumbledore's right hand side, and frowned subconsciously.

"Why are you taking this medicine again? Has Elaina gotten into trouble again while I was away?"

"It's not a big deal, I remember you've experienced it several times."

Dumbledore took off his glasses from the bridge of his nose, rubbed his swollen brow, and a helpless expression appeared on his face.

"Miss Kaslana took the other three little girls and blew up half of the History of Magic classroom. The walls near the windows were all blown away. The house-elves are still collecting the scattered wall debris and trying to repair it a little."

Grindelwald: "..."

Hearing Dumbledore's words, the old man's mind first flashed with his bedroom in Nurmengard Castle with a big hole, with the beautiful Austrian snow-capped mountains outside the hole...

Then, there was the pile of broken wooden boards in Elaina's room below his former bedroom, and the blown-away gate at the entrance of the castle...

And...

"Uh... Elaina... hasn't that kid been quite well-behaved recently..."

The first-generation Dark Lord twitched the corner of his mouth, looking at Dumbledore with a puzzled expression.

"I remember just last night, you were saying that Elaina has been very obedient recently, and the children's mutual assistance learning plan is going very smoothly?"

"No, it's all an illusion."

Dumbledore's face darkened, and he waved his hand.

"Before, it was just because the commotion they caused was relatively small, so I didn't notice it. If it weren't for the experimental accident that happened today, it might not be impossible for the castle to be blown up by these little guys one day."

"Blown up? That's a bit of an exaggeration."

Grindelwald grinned and smiled, "With that little girl's strength, it's unrealistic to want to blow up a magically protected castle - even if she drains all the magic power in her body, at most she can only collapse one or two towers."

"That's how it used to be, but it may not be the case in the future, take a look at this."

Dumbledore shook his head with a wry smile, picked up a piece of parchment covered with formulas and letters from the desk, and handed it to Grindelwald.

Although he has not yet fully understood the [chemistry] knowledge, for Dumbledore, who has a certain foundation of alchemy knowledge, one night is enough for him to understand most of it.

Especially... when he has a lot of ready-made raw materials at hand, as well as Luna's detailed experimental process recorded.

According to the girls' records, the process of this type of "chemical experiment" is not very complicated.

After Elaina and others left the Headmaster's office, Dumbledore quickly found a safe and stable open space and began to try to reproduce some of the basic experiments that Elaina had conducted before.

Verifying conjectures from phenomena and results, mastering principles and summarizing rules in the process of practice, this is originally the most normal experimental process and mind map - perhaps Dumbledore does not understand the so-called chemical bonds and equations, but this does not affect him to complete most of the operations by following the steps on the scratch paper.

And when a simple mixed explosive is formed, there is no obstacle for Dumbledore to detonate it with an Explosion Charm or ignite it with conventional flames.

"What is this?"

Grindelwald glanced at the densely packed formulas and numbers on the parchment, pursed his lips, and looked up at Dumbledore and asked.

"This is what Elaina has been tinkering with and researching these days, and... it is also the main factor that she blew up the History of Magic classroom today. She calls this [magichemical]."

Dumbledore said, pointing to the parchment in Grindelwald's hand, his expression gradually became serious, and his voice said steadily.

"According to the experimental records provided by those children, I selectively tested it five or six times. Although I can't achieve Elaina's effect, it's... enough to prove and deduce a lot of things."

"Times have changed, Gellert! We may need to talk, and I need to hear your opinion."

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(Oh my god!!)

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