A certain Hogwarts professor of runes.

However, no matter how little he knew about the plot, he still understood some of the most basic things.

For example, Harry Potter's adventures in his previous life were made into eight movies. If we assume one movie per school year, that's eight years in the wizarding world. This fits Felix's imagination: seven years of adventures within the school, plus a year after graduation to completely defeat Vader. Perfect.

Very rigorous reasoning.

A school year has already passed, and if nothing unexpected happens, Voldemort will be completely dead in seven years.

Thinking of this, Felix felt somewhat relieved.

He is certainly no match for Voldemort now, but the future is uncertain.

Felix went out and walked the streets of London, pondering his future strategies.

Half an hour later, he stood in front of a dental clinic—the very one he had discovered a month earlier.

Felix pushed open the door and entered, the bell at the door ringing crisply.

A middle-aged man in a white coat peeked out from the inner room, glanced at Felix, and asked, "Are you here for a dental checkup?"

Felix replied briefly, "I want to get my tooth filled."

The dentist nodded and led him to a chair. "Please sit down. My name is Will Granger, you can call me Dr. Granger."

“I am Felix Heap.”

Dr. Granger had him lie down in a chair and examined Felix's mouth with something like a searchlight, looking somewhat puzzled. "Mr. Hyp, your teeth are in very good condition, very clean, very straight, and very symmetrical in size..."

Felix pointed to the upper left side of his cheek. "I want to get a wisdom tooth fixed."

Dr. Granger paused, this was indeed a strange request; wisdom teeth weren't particularly useful. He said sincerely, "Mr. Hyp, I don't recommend you get a wisdom tooth filled, because..."

Next, Dr. Granger demonstrated his professionalism by giving him a full twenty-minute lecture on dental knowledge.

During this time, a little girl with fluffy hair walked in. She was about twelve or thirteen years old. She glanced at the two of them, and especially when she saw Dr. Granger's incessant talking, she showed a look of utter despair, as if to say, "Here we go again."

Finally, Felix had to interrupt him, "Dr. Granger, how about this, you can make the tooth for me first, and I'll decide whether I need it filled after I've tried it."

Dr. Granger thought about it and agreed that it made a lot of sense. He took out a pen and paper to record the dimensions of Felix's mouth, and after comparing and contrasting them on the paper, he quickly confirmed the size and shape of the wisdom tooth.

He then went into the inner room and began to work.

Felix looked around the clinic with great interest, especially at one wall covered with small cabinets, through which enlarged dental models could be clearly seen.

Just as he was engrossed in watching, a confident voice appeared to his left.

"Filling a tooth is not the best option, especially for a wisdom tooth that is not essential."

Felix turned his head to look at the little girl, and then heard her add, "It will hurt a lot."

"It hurts a lot? How much does it hurt?"

"First, we need to drill a hole in your gum with a small drill bit, then drill a hole in your artificial wisdom tooth in the same way, connect it with screws, and then fix and adjust its position."

Felix suddenly started to have a toothache...

The little girl continued her explanation: "Even after a filling, it's not a permanent solution. On the contrary, damaged gums are more susceptible to further damage. If you have poor oral hygiene habits, it can even lead to gum decay and plaque buildup, causing existing teeth to loosen and fall out, requiring further repairs..."

"Stop talking!" He already had a picture in his mind.

Although he can use magic to heal and relieve pain, his heart is now wounded.

Seeing Felix's uncomfortable expression, the little girl tossed her fluffy long hair and ran to a corner to read a book. It was clear that she was in a very pleasant mood.

Nearly twenty minutes later, Dr. Granger came out again.

He held a silver-white tray in his palm, on which was an artificial, polished, and refined tooth.

“Looks great, doesn’t it?” Dr. Granger praised his own skills.

However, Felix simply nodded; he was startled by what the little girl had just said!

Following Dr. Granger's instructions, he tested the artificial wisdom tooth, without drilling or wrapping it with wire, simply to test its comfort.

“Very good!” Felix praised. “However, I’ve decided not to get any more fillings.”

"Really? It seems you made the right decision." Dr. Granger wasn't angry about losing a business deal; instead, he was happy for him.

However, the customer made a new request: "I want to buy this tooth as a souvenir."

"A memorial?" Another strange request, Dr. Granger thought to himself. Even the little girl who was quietly reading a book next to him looked up at him.

"That's right, a commemoration."

“Alright.” In the end, Dr. Granger only charged for the materials.

As Felix walked out of the clinic, Dr. Granger still felt something was off. He complained to his daughter, "A very strange guest, don't you think, Hermione?"

Hermione Granger looked up at Felix's figure disappearing around the street corner, shook her head, and lowered her head again to read her book.

Chapter Ten: Felix's Wisdom Tooth

Back home, Felix went to his workbench and began modifying the tooth:

First, drill a hole at the bottom of the tooth to make a small opening;

Secondly, smooth out the small hole;

Next, place it under a microscope and use a carving knife purchased from a micro-carving merchant to carve out neat ancient magic runes, which are nested together to form a circuit.

This is a delicate task—constructing magical runes within an extremely small space. It's safe to say that very few in the entire magical world can achieve this. But Felix, with his professional engraving tools and the latest generation microscope purchased at a high price, reduced the difficulty of the entire magical process by two-thirds.

This is one of the results of his theory—the combination of Muggle wisdom and magic.

The so-called Muggle wisdom is not just about their ingenious ideas; the tools they use to study and transform the world are equally fascinating.

In the wizarding world, very few people can do this.

Leaving aside pure-blood wizards, some of them despise Muggles, while others at most don't reject them;

Wizards of mixed race, or those from Muggle families, may be more familiar with the Muggle world, but during the crucial period between the ages of 11 and 18, their energy is primarily focused on magic. Once they reach adulthood, their thought patterns are already fixed, making it impossible to deeply combine the strengths of both approaches.

……

It wasn't until the afternoon of the following day that Felix finally completed the construction of the twelve sets of magic rune circuits. Each circuit contained anywhere from three to five ancient magic runes to more than ten. As the last ancient magic rune was completed, he carefully connected the twelve sets of circuits, forming a unified whole.

One by one, the magic circuits were lit up, and the radiance of magic bloomed in the narrow space!

As the last circuit lights up, the entire set of twelve circuits finally closes completely, forming a continuously evolving whole and transforming into a bright and unified mysterious pattern.

The small hole inside the tooth began to expand without leaving a trace, quickly becoming the size of a suitcase. And this expansion did not end. Felix waited quietly, savoring the results of the day and night, a satisfied smile on his face.

Finally, the internal space of the tooth expanded to almost half the size of a room. Then, the concealment circuit began to activate, rapidly reducing the surging magical fluctuations until they were almost imperceptible; the stabilization circuit began to solidify the entire rune structure, and the fortification circuit made the tooth, the carrier, extremely strong and resistant to wear...

The most crucial part is the activation circuit, which will only be activated according to the conditions it sets.

Felix smiled with satisfaction. The third cave was complete!

He took out his briefcase and transferred the things he had prepared beforehand into the tooth hole. Felix considered it a "portable storage room for spare supplies." Inside, there were not only seven or eight wands (obtained from the dark wizard), but also various magical potions, flying brooms, tents, and other items.

Having done all this, Felix put the teeth back into his mouth and fixed them with magic.

He smacked his lips, nothing seemed amiss, and then licked the wisdom tooth deep inside his mouth with his tongue. Hmm, it wasn't much different from a real tooth. Dr. Granger's technique was really good!

Felix sat quietly at his desk, his gaze calm and lingering.

Most of his belongings, the most commonly used and unimportant ones, were in his briefcase;

The important items, which served as his backup supplies, were divided into three parts, a strategy known as "a cunning rabbit has three burrows."

First Cave: A gemstone ring on his left hand contains some of his precious materials, potions, books, and some of his research results, and is engraved with hidden magic runes;

The advantage is that it is portable and convenient for daily use;

However, the downside is that if it is used too often, it will inevitably be noticed by others and it will be difficult to escape the sight of a master wizard.

Felix positioned it as an everyday item, and something to be displayed in the open to attract attention.

In the second cave, the magic rune circuit on the right wrist only stored one spare wand;

Its greatest advantage is its extreme concealment, making it almost impossible to detect by conventional means;

Felix sees it as a powerful tool for turning the tide in desperate situations!

The third cave, "Felix's Wisdom Tooth," stores a large amount of conventional and strategic supplies.

Its advantage is also its extreme concealment;

Felix's role for him was to provide him with ample supplies when he faced a major crisis and had to go into hiding.

"That should be enough to make it safe."

Felix believed that people with such a strong sense of crisis were extremely rare in the wizarding world. Perhaps some experienced Aurors had the same mindset, but their methods were definitely not as good as his.

In particular, he was proficient in the technique of brain oppression, and conventional torture could not make him reveal his secrets!

Of course, this is the worst-case scenario, and Felix doesn't think he'll end up in that situation. But things are unpredictable, so it's always good to be prepared.

In the coming years, the shadow of "Voldemort" will loom over the British wizarding world.

Felix never dared to underestimate him. Perhaps this second-generation Dark Lord had intellectual problems, but he was definitely a magical genius, and he had spent far more time studying magic than Felix himself, not to mention that his research topic was the unorthodox and evil "killing and death".

With less than a week until the start of the new semester, Felix was ready to relax; he had been exhausted lately!

He could watch movies, attend concerts, and enjoy delicious food—after all, he still had £100,000 in his account! He'd be spending most of his time in the magical world, and he couldn't convert all of that money into Galleons anyway; keeping it would be a waste!

Felix spent a lot of pounds on a range of Muggle gadgets as entertainment in his spare time.

In particular, he spent eight thousand pounds on a small projection system, the kind used in cinemas, along with copies of classic films available on the market. As for the rule that Muggle items cannot be used at Hogwarts?

Is this a problem for him?

Similarly, music is also essential. Felix considers himself a typical Slytherin and enjoys it as much as possible.

With the start of the school year approaching, Felix tidied up his room, packing all his magical items into his suitcase—if a thief came and took one or two magical items, it would be a considerable problem.

"Is there anything else that needs to be prepared?"

Felix thought for a long time, then suddenly slapped his clever little head, "That's it, books!"

He recalled the principal's hint during the interview, so he first bought several pairs of wool socks in different colors, and then began a shopping spree at various bookstores.

He had both items for himself and Christmas gifts he had chosen for the professors, preparing them regardless of their usefulness.

Felix was preparing to give his former dean a copy of "A Guide to Common Experiments for Middle School Students," the kind with lots of illustrations.

I hope he'll like it.