From Azkaban to Hogwarts.

"Let me check it again."

Harry was also a little unsure. He took the book and started checking it again using the methods he knew, but he still couldn't find any problems.

"Destroy it..."

Harry waved his wand, and after it shattered into pieces, the poor book was no longer readable. He waved his wand again, turning it into countless little birds, which then flew out the window.

-

“Harry…”

Ron, looking like he was about to collapse, showed Harry his backpack. Yes, that damned book was back again.

"what should I do?"

"Going to the professor is beyond our capabilities..."

Harry thought for a moment, then, disregarding that it was already night, he took Ron and the book and ran towards the large office of self-defense techniques.

"Dong dong dong."

Harry knocked on the door urgently, but heard someone inside call out, "Come in."

"The professor isn't here?"

He was puzzled for a moment, and when he went in, he found that the office was not only full, but also had three professors of self-defense techniques, as well as several senior students, and the two red-haired ones were in charge.

"Looks like the person involved is here too," William glanced at the door, shook his head with a smile, and said, "Come on over, you brought that poor book, didn't you?"

"Poor book?"

Harry and Ron exchanged a glance, somewhat confused.

“Let those two explain to you…” William pointed at the twin brothers with annoyance—he knew that the closer they got to graduation, the more he needed to keep an eye on these two students!

Sure enough, he caught me red-handed today.

It was a group crime, involving several seventh-grade students and a deceived fifth-grade student!

"It's a prank, but this book?"

Ron looked at his two older brothers, a little dumbfounded—the worst pranks they ever played before were nothing more than unbreakable vows, and now they're even using curses?

"Ah, Ron, this is a birthday present for you. We won't be able to celebrate your birthday at school anymore."

Fred looked at Ron with a gentle expression.

If you didn't consider what he did, he really would seem like a very good older brother.

"My birthday is in March, which has long passed now."

Ron's tone was extremely rude. Damn it—those two were too ruthless; he'd been living in constant fear these past two days…

"Oh no, did we make a mistake? Good heavens, this..."

“What a generous gift,” William exclaimed. “You two really are something, buying ten identical books just to send to your brother…”

"Exactly the same?"

Ron and Harry stared in disbelief. Harry suddenly realized what had happened; he'd destroyed the book so thoroughly, yet it had somehow returned intact…

"You guys are something else..."

William was starting to admire these two—anyone in their shoes would have thought the damned curse had come true…

Instead of focusing on graduation exams, this seventh-grader came up with such a terrible idea.

"Wait, it's exactly the same..."

William pondered in a low voice, instructed Lupin to take over the case of the seventh-grade fraud gang, quickly found a secluded corner, then Apparated into the Forbidden Forest and drew his wand.

"Magic deception?"

"No, this is too ordinary..."

"That's not what I want, what I want is..."

-

Why did the professor suddenly leave?

Harry was a little confused, but he wasn't too worried at the moment—Ron wasn't cursed, the so-called cursed books didn't exist, and everything was fine.

As for the twins being arrested, well, we're used to it.

The impact of this was not even as great as Dumbledore's temporary suspension of their classes—and in hindsight, the twins' plan was indeed quite astonishing, with identical books becoming substitutes for the same book.

"Two thousand words of self-criticism each, plus a week of labor for the Weasley brothers."

Lupin looked at the room full of Gryffindors and shook his head helplessly—they had never used such a trick to prank anyone back in the day. He should write a letter to Bigfoot when he got back and describe the incident in detail.

While it's unethical, this book is indeed a bit too much...

However, he still maintained a stern expression, asking, "Any objections?"

"No, Professor, we are happy to undergo reformation!"

The twins readily took responsibility, and Ron, the person involved, had no further objections—his main anger was that it truly was a curse; since it wasn't, then he could only say he was used to it…

-

"What a pity, the professor caught him..."

"yes…"

Several idle people were discussing things together, but the twins alone had a resigned expression on their faces.

Only after everyone dispersed did the two reveal a hint of surprise on their faces, a smile of triumph over their successful scheme.

"We succeeded! The professor had our eyes on us just as expected!"

"Next, let's take advantage of the work to move the props we've prepared!"

"There's nothing to say about this reasonable movement; even if the professor used the Marauder's Map, he wouldn't have noticed anything wrong!"

Their eyes were filled with fighting spirit.

What was given to Ron was just an appetizer—it was a bit of a pity that the rest of the books weren't sent over, but it lowered the professor's guard and allowed him to take the opportunity to move the important props, so it wasn't a complete loss.

'I just don't know what the professor has suddenly become so busy with...'

"But it's okay, nobody knows this prank is just setting the stage for the next one. We're going to make a big splash at graduation!"

The two exchanged knowing glances, their eyes filled with anticipation for William.

"Behave yourselves, it's you again, the Weasley brothers!"

Filch suddenly appeared and said, "You all need to clean all the chamber pots in the hospital today!"

Chapter 587 William's Little Study

In the Forbidden Forest, the early summer sun was mostly blocked by the trees, and the sunlight falling on his face only felt somewhat warm. However, William showed no appreciation for it and leaned against a dead tree, deep in thought.

'replace…'

The twins played a prank on their younger brother. What was just an ordinary book was transformed into an illusion that it would never be damaged after being replaced several times.

'But in terms of magic, where would this substitution work?'

Back in Azkaban, he knew of a wizard who had been brought in for fraud. The wizard would always show the genuine article, but after the customer inspected it, he would secretly replace it with a cheap imitation when handing it over. He never failed—of course, he eventually got caught trying to scam an Auror on vacation…

He had told William that almost all wizards would lower their guard after a careful examination, provided they were greedy enough.

Because he sells goods at prices significantly lower than the market price, and pretends to be ignorant of market trends, buyers will choose to complete the transaction quickly after confirming that the goods are genuine.

'But these two substitutions are completely different... Why did I even think of that?'

'You can't just apparite and run away when you encounter danger...'

'It's not impossible... If we use multiple fake bodies to confuse them, it will be much easier to escape...'

'No, that's not it. That's definitely not what attracted me back then!'

William shook his head vigorously; the replacement he envisioned was definitely not that kind of replacement, but rather something very deceptive…

"Yes, yes, it's a continuous replacement, a transformation!"

He drew his wand and summoned a stream of clear water towards the open space in front of him. A large amount of water was then fixed in mid-air, becoming a transparent, off-white sphere.

"Try Transfiguration again..."

He raised his left hand and began to deform the manipulated water sphere—the water sphere was compressed infinitely, and then wisps of ice needles rapidly condensed on the sphere until a water sphere tall enough to be a person was frozen into an ice ball the size of a Quake ball, which looked like it had infinite cracks.

"That's right, supplement... supplement..."

A hint of excitement appeared on William's face. He used his left hand to keep the ice puck suspended in the air, and then began to cast his most proficient black magic with his right hand—as the purple spell struck the ice puck, it began to turn a beautiful blue and sparkle in the air.

He felt a bit strained, but his in-depth study of shapeshifting techniques during this period allowed him to maintain the shape of the ice puck.

"The final step."

William steadily held the puck in his right hand with his wand, while his left hand began to cast the final transformation spell.

"go with!"

He swung his left hand, and the puck began to spin rapidly, then, under the influence of a spell, sped forward.

'It's still a bit slower than the flight speed of a regular spell…'

Just as William was judging the new spell from behind, the high-speed flying ice ball began to rapidly fling out pale blue ice shards under the effect of the transformation spell.

Fine icicles shimmered and refracted the sunlight before falling onto the surrounding trees and grass—they didn't pierce the trees directly, but rather stuck to them like water droplets, then froze rapidly.

The world, which was originally lush and green in the height of summer, was suddenly dyed a cold and desolate white. The ice hockey puck, the culprit, did not even have the slightest awareness of slowing down. It continued to throw out those deadly pale blue ice spikes, which, as it spun at high speed, spread this deadly white with a cruel howl across all the land in its trajectory.

When it hurtled into a frozen tree, the tree, already covered in layers of ice, shattered into countless fragments like a block of ice. The ice ball itself continued to hurtle backward at high speed until it destroyed the eighth giant tree before finally losing its momentum and shattering into a pile of glittering ice shards.

'This power…'

William grinned as he looked at the area where almost half the street had been destroyed—the damage was far greater than he had imagined.

He strode to the area where the ice hockey puck had passed. The plants there had been frozen and cracked into pieces, as if they had been weathered for countless years. A light step on them would shatter them all—it would be enough to just step on them with his foot.

'This effect can only be achieved when the spell is used at full power…'

'But the damage to the soul seems to have been weakened—is it due to the Polymorph or the compression?'