I've already become a Hogwarts professor, and the system only just appeared.

"Eleven years ago, before she died, Lily cast a powerful protective spell on Harry, which severely injured Voldemort."

"That magic is still working on Harry. Whenever Voldemort touches Harry, he will be attacked by that spell."

"So you want Harry to kill Voldemort? Forgive me for being blunt, but that's far too dangerous!" Su Yu said.

Dumbledore nodded in agreement, but added, "Yes, it's dangerous, so we need to help Harry. I hope you can provide him with a magical item that can save his life in a critical moment."

Su Yu found it a bit strange. According to the original plot, even without his help, Harry eventually succeeded in killing Quirrell and putting Voldemort back into his ghostly state.

If that's the case, why would Dumbledore still ask for his help? Was it another test?

However, Su Yu quickly realized that he thought this way because he was from God's perspective, deduce the process based on the known result.

But Dumbledore was different. He was scheming, playing chess, but he didn't know if his plans would actually come to fruition. He could only try to add as many safeguards as possible.

Su Yu readily accepted, saying, "Professor Dumbledore, of course I have no problem with that, but you should know the basic laws of alchemy, right?"

“Equivalent exchange! What do you want?” Dumbledore immediately understood Su Yu’s thoughts.

"As an alchemist, I would like to have a close look at the Philosopher's Stone after this is done. Of course, it would be even better if you were willing to give it to me," Su Yu stated his condition.

Dumbledore was somewhat exasperated; this kid really dared to bring it up. "I'm sorry, the Philosopher's Stone doesn't belong to me, but I can make the decision to let you observe it in my office for a week."

"Then it's settled!" Su Yu immediately agreed; that was enough for him.

The following evening, Su Yu returned to the room, where two people were present: Harry Potter and Ron Weasley.

As early as yesterday, after returning home, Su Yu used the Marauder's Map on his phone to observe Harry and found that the boy had indeed gone to the Mirror of Erised.

Today, he continued to observe through the Mirror of Erised and discovered that Harry had come with Ron. Since he had promised Dumbledore, Su Yu naturally had to keep his promise, so he took the initiative to come over.

"Did you see that?" Harry asked quietly.

"I can't see anything."

"Look! Look...they're all here...there's a huge crowd..."

"I can only see you."

“Take a good look around, come over here and stand where I am.” Harry stepped aside.

However, as soon as Ron stood in front of the mirror, Harry could no longer see his family. He only saw Ron standing there in his ribbed tweed pajamas, staring at himself in the mirror in disbelief.

“Watch me!” Ron said.

"Can you see your family all around you?" Harry asked.

"No, it's just me, but it's different from now. I seem to have grown up. I'm still the president of the boys' student council!" Ron said excitedly, patting himself down.

"What?" Harry was dumbfounded.

"I'm wearing Bill's old badge, and I'm holding the House Cup and the Quidditch Cup. I'm also the captain of the Quidditch team!" Ron finally managed to look away from the magnificent sight and excitedly looked at Harry.

"Do you think this mirror foreshadows the future?" Ron asked expectantly.

Harry immediately denied it: "How could that be? My whole family is dead... Let me check again..."

Ron refused: "You've been watching alone all night, give me a little time."

Harry retorted, annoyed, "What's so fun about holding the Quidditch cup? I want to see my parents."

"Don't push me..."

Listening to their conversation, Su Yu found it somewhat amusing. Following Dumbledore's example, he quietly dispelled the Disillusionment Charm and stood behind them.

"Harry, Ron, what are you doing here so late?"

The two little ones were startled, but when they turned around and saw it was Su Yu, they weren't so nervous anymore. Harry said, "Professor Su, you're not going to deduct points from our scores, are you?"

"Of course not, it's a holiday now, but your presence here at this time is clearly against the rules," Su Yu said.

Upon hearing that he wouldn't lose points, Ron excitedly exclaimed, "Professor Su, there's a mirror here that foretells the future! In the future, I will become..."

As Ron's claims grew increasingly absurd, Harry couldn't help but retort, "That wasn't a mirror that foreshadowed the future. I saw my parents, and they're already dead. Professor Sue, what is this?"

Su Yu explained, "It is the Mirror of Eris, a mirror that reflects what you most desire in your heart, so what you see is actually what you desire."

Upon hearing Su Yu's words, both children lowered their heads. Harry was reminded of his parents, while Ron was saddened by the shattering of his dreams.

Just then, some noises came from outside, and a cat with dull gray fur and skinny bones walked in, meowing.

"It's Mrs. Lawrence! Filch is coming! Run!" Harry exclaimed instinctively.

Su Yu was somewhat amused and exasperated. What on earth had Filch done to provoke such a strong reaction in the young wizard? He pulled Harry aside:

"Don't be afraid, don't be afraid, I'm here, you don't need to be so nervous!"

Chapter 46 Conflict with the Centaurs

"Let me see which little wizard is running around here instead of sleeping at night! I need to... Ah! Professor Su... Professor Su, what are you doing here!"

Since acquiring the magic pistol, Filch's personality has changed a lot, and his voice has become cheerful. However, Su Yu's appearance still caught him somewhat off guard.

Su Yu waved his hand casually: "It's nothing. I brought the two kids here to learn some things. There's nothing else. You can go patrol other areas."

"As you wish, Professor Su!" Filch bowed to Su Yu and silently withdrew.

"Professor Su, you're amazing! Filch has never been this respectful to Headmaster Dumbledore." Ron said excitedly after Filch had walked away.

Harry's eyes shone with admiration for Su Yu. Although Su Yu was secretly pleased, he said calmly, "It's nothing, just letting him use some simple spells."

Ron and Harry were even more shocked. Harry was alright, but Ron, as a pure-blood child who had grown up in the wizarding world, knew that Squibs couldn't be used for spellcasting.

Ron asked incredulously, "How is this possible? How can a Squib cast a spell? Professor Su, how did you do that?!"

Harry reacted faster, saying, "Is it a magic pistol? I heard Fred and George say that they're really pushing themselves to win one by the end of the year."

Su Yu nodded: "That's right, but the version of the dud is more special and more difficult to make. Don't tell anyone about this for now. I don't want all the duds coming to me."

"Don't worry, we promise we won't let anyone else know about this," Harry said confidently.

Su Yu didn't believe a word of Harry's assurances, given that Harry was someone who liked to plot loudly, nor did he expect them to keep it a secret.

This is because when two people share a secret, their relationship becomes closer and they are more likely to gain each other's trust.

"Alright, you should go back now. The Mirror of Eris is just showing you an illusion. Don't get too caught up in it, or you'll lose yourself." Su Yu decided to end the conversation.

Harry glanced at the mirror one last time, then said to Su Yu, "Understood, Professor Su, we won't be coming back!"

Su Yu patted his shoulder, took out two necklaces, and said, "These two little things are for you. They can provide you with some protection in critical moments."

“This… is too valuable, we can’t accept it.” Harry quickly waved his hand. The magical phone he received for Christmas was already worth 50 Galleons, and this kind of defensive alchemical item certainly wouldn’t be cheap either.

Su Yu then smiled and said, "Do you know the club I founded? Raven's Feather!"

“Of course, George and Fred have shown off that ring to us several times already!” Ron said sourly.

"Then accept it, and study hard, grow up as quickly as possible, and strive to join Raven's Feather. That will be your way of repaying me," Su Yu guided.

Upon hearing this, Harry's enthusiasm surged: "Don't worry, Professor Su, we'll definitely meet your requirements soon! By the way, can we add you as a friend on Fetion?"

"Of course!"

After seeing the two little ones off, Su Yu took advantage of the fact that no one was around and walked towards the Eris Magic Mirror. He took out a number of detection devices from the Seamless Extension Bag and began to examine this alchemical device.

Actually, he wanted to do this last time he came, but he was too embarrassed because Dumbledore was watching him. This time, with no one around, he really wanted to study this legendary alchemical item properly.

After examining it, Su Yu couldn't understand much directly, but he could roughly guess that the magic mirror used magic to emit a certain kind of light, creating an illusion.

This technique is quite useful. For example, you could use it on Lupin during a battle, making him see the full moon and instantly turning him into a terrifying being who can't distinguish friend from foe.

There are many uses, but understanding the underlying principles is still a long road. After recording all the detected magic rune circuits, Su Yu left.

The Christmas holidays came to an end quickly, and the little wizards all returned to the castle. Hermione arrived a day early, and the first thing she did upon returning to school was to add everyone she knew who had a magic phone as a contact via Fetion.

This naturally included Su Yu as well. The little girl even brought Su Yu a mechanical watch from the Muggle world. Although it wasn't particularly valuable, it was a token of her affection, and Su Yu gladly accepted it.

In the new year, Hogwarts school has obviously undergone many changes, the most notable being the Magic Phone, which has propelled children to the top of the social circle.

Then there's Raven's Feather, a club that had only been established for a short time, and soon legends about it spread among the students.

There are many reasons, such as the legend that Professor Su Yu would give a magic phone to anyone who joined Raven's Feather.

For example, the rings issued to members of Ravenfeather are said to be able to unleash powerful protective magic and are valuable alchemical items.

Various legends quickly made Raven's Feather the most desired club for Hogwarts students, bar none.

This also made Gemma Farley and her four companions prominent figures at Hogwarts, but none of this affected Su Yu at all.

Su Yu was very busy. His magic server had made some new breakthroughs. The magic patterns on the moonstone had been completed, but it still needed a magic material to fill them before it could be officially activated.

Suddenly, a black cat leaped from the windowsill into Su Yu's room. It was Coal Ball, meowing excitedly.

"Are you sure he's going to catch a unicorn?" Su Yu's eyes lit up.

The material he needed was unicorn blood, a creature that could also absorb moonlight and was naturally very compatible with moonstone.

However, unicorns are symbols of holiness and purity. Harming or killing a unicorn will bring bad luck upon oneself, and drinking unicorn blood will invite a curse.

Su Yu didn't want to be tainted by any misfortune or curse, but unicorn blood is almost impossible to preserve; once it flows out of a unicorn's body, it will quickly deteriorate and rot.

Coincidentally, Su Yu knew that there was someone at Hogwarts who was planning to hunt unicorns, so he instructed Coal Ball to keep an eye out during the Forbidden Forest hunt and to report back immediately if he found anything.

"Meow meow meow..." Coal Ball continued to meow, meaning: It's definitely to capture a unicorn. That person went to the Forbidden Forest yesterday but failed. He must have made thorough preparations for going again today.

"Then what are we waiting for? Let's get going!" Su Yu stood up and urged.

The two quickly left the castle and headed towards the Forbidden Forest. As soon as they entered the Forbidden Forest, Su Yu tore off the collar from Coal Ball's neck, restoring it to its original size.

Coal Ball has a keen nose. Following the scent, it led Su Yu through the forest, deeper and deeper. Soon they discovered a pool of bright silver blood, which was indeed from a unicorn.

Su Yu squatted down and observed that only part of the blood was putrid and looked relatively fresh, probably left not long ago. However, it could no longer be used to fill the magic patterns on the moonstone.

Just as he was about to continue the pursuit, suddenly, with a whoosh, two arrows came flying from nowhere. They were so fast that Su Yu knew without thinking that they must be arrows from the centaurs.

The last time they entered the Forbidden Forest together, the centaurs also shot arrows at them, but that time it was just a warning, and the arrows were aimed at the ground beneath their feet.

This time was clearly different. The centaurs were targeting him directly, which felt completely different from the last time. The arrows, carrying a sharp killing intent, made Su Yu's heart skip a beat.

One arrow was aimed at Coal Ball, and the other at Su Yu. Coal Ball was extremely fast, and with just a slight twist of its body, it dodged the arrow's attack.

Su Yu's reaction was much slower. By the time he made a move, the arrow had already triggered the defensive alchemical artifact on his body, and a white light barrier enveloped him.

Ding! The arrow hit the light screen and bounced off, causing a faint ripple to appear on the screen, and its color dimmed slightly.

Su Yu was awake and dared not hesitate. He drew his wand with his right hand and put on another layer of armor to protect himself. He raised his left hand high, revealing the bracelet that Ferrenze had given him.