Zarathu was a man of erudition, whose erudition was reflected not only in his mastery of magic, but also in his deep knowledge of the natural sciences, and because of this, he was given the title of "Polymath" by the academic community. He was undoubtedly talented, but his body limited his agency, and he had to rely on his excellent students to conduct most of the profound magical experiments. Because of this, he founded the "Naturalist Society", a school that is widely known in the academic circles.

Zarathu was very strict with the selection of students, and the total amount of magic that the body can carry was one aspect, and what he valued more was the sensitivity of the students' thinking, their curiosity about all things, and their acceptance of new things. He did not think that ignorance was a very shameful thing, there were times when people were ignorant, and Zarathu obviously had times when he did not know anything about it, but he did not discourage it, but approached everything in front of him with a sense of longing. He wants his students to join him in exploring the ultimate mysteries of the world, the limits of humanity and magic, and all the unknowns of the rest of the world.

His presence was a shock to the whole of Yaris, and to all aspects of society. His students are all excellent, and their impact on people is evident on the streets. Even the most recent new magic communication device was invented by one of Zarathu's students.

When Sheldon was interviewed by an excellent student of Zarathu, the learned man asked him: What is the right adventure you have ever taken in your life? Sheldon replied that his most correct venture was to engrave one of his magic patterns on a chestnut branch. Zarathu continued to ask with interest: Why? What were the results of your experiments? Sheldon's performance was unexpected: he dug his hand into his chest pocket and pulled out a wand that had been wiped clean. He sent a trace of magic power from his fingertips and poured it into the wand in his hand, and the wand suddenly emitted a misty golden light, this magic pattern was actually the same reaction as engraved on the human body!

Sheldon was taken in as a student by Zaratul and delved further into his childhood "adventures", culminating in the conclusion that anyone with powerful magical powers could grant magical powers, even magic patterns, to an objective individual - Sheldon's research team found that by fine-tuning the way magic was manipulated, the magic in one's body could be retained in other animals and plants. Sheldon didn't put his other three patterns in it, but he was able to carve some "temporary" patterns on other objects. It's not actually accurate to call it a magic pattern, it should be said to be a delayed triggering technique.

They started with stones as test carriers, then plants, and later experimental animals. As for the aspect of human experimentation, because most people have engraved magic patterns, everyone's magic has their own innate nature, and if the magic of different phases is allowed to enter a person's body, it is obvious that a rejection reaction will occur. The team made the assumption that if they were to engrave a temporary spell on a person's body, either the person who engraved it would not be able to accept any mana, or the spell should be non-static. Attributeless magic is not so easy to extract, and it is said that the method of using attributeless magic is taught only within the Merlin Sect.

Zarathu's extremely distinctive personal temperament has long been the inquisitive spirit of his students, and each of them has his own style of studying. Sheldon has reached this point, and he wants to be able to accept the knowledge of using attributeless magic so that he can continue his academic research. And this erudite old man is short-sighted, and in disguise, he has a strong desire to control.

In the midst of a dispute, Sheldon decided to leave the school of Zarathu and enter the Merlin Sect. The reason why he prevented Sheldon from entering Merlin was that he believed that the content of Merlin's research was unsubstantiated, and that with the current level of technology, it was completely impossible to touch the origin of human beings and spy on the traces of the creator god Didama. Even if he learns how to use attributeless magic, his future research direction will be changed by the Merlin Sect. More crucially, Zarathu didn't want Sheldon to lose his name and hide his true nature by entering the Merlin Cult.

Although the power of the World Tree is incomparably powerful, Zarathu also secretly studied it carefully, and came to a staggering judgment: the power held by Lux is time, and the connotation of time is not only the past, present and future; The existence of time is multidimensional, assuming that "this now" is a time and space, then "another now" is another time and space, and the sealing of the name is likely to erase the imprint of the name in this time and space, or transfer it - that is, his personality, memory, or humanity will also be affected by the power of the World Tree! He knew that there was a limit to the power that human beings could reach, and that directly touching the power of the World Tree was tantamount to touching the power of God, and that the idea of ascending to heaven in one step was very stupid and dangerous......

Moreover, Zarathu did not know what the real intentions of the Merlin cult were for...... The origins of this sect are unknown, and the number of people is so small that it survived the existence of the Yaris. This is a very ridiculous thing! Selfishly, Zarathu always didn't want his students to run away and be their subordinates...... He had never heard of a precedent for him to be able to retire after entering the Merlin Sect.

All in all, Zaratul was opposed to Sheldon's departure. But he has never restricted the personal freedom of any person in his school, and the human heart cannot be bound, so there is no point in binding a person's body.

Sheldon left after leaving his last letter. Zarathu did not open the letter when he saw it, and there was no resentment in his heart, only sorrow. It was only a day later that he came out of this grief and opened the letter. The letter was probably as follows: Mr. Zarathu, the most profound teacher he had ever met in his life, and he sincerely apologized for going against his will to teach in Merlin. At the end of the letter, he saw a line written in black ink with force: I will be back.

Seven years have passed. In his fourth year, he fell seriously ill, and he was already in his seventies, and he was not in particularly good health, so he stopped accepting disciples and gave only some basic lectures in the society. The rest of the time, he didn't just do the work of inquiring into new subjects – he didn't have that much energy, so he had to leave it to the students——, he had to write books, and he had to do rehabilitation.

Fortunately, in the past few years, Zarathu's body is still quite tough. Every now and then he thought of Sheldon, turning the damp paper back open, the ink on the rough paper smudging several times. There have been many major events in recent years, especially the conflict between the Merlin Cult and the Brotherhood, which made him worry about Sheldon's safety.

Seven years after Sheldon's departure, Zarathu received the first news of his departure from Merlin, and made every effort to inquire about his residence, personally delivering him a letter. The other party wrote back to him much later, but this shows that the other party is still alive and has not ...... And did not forget about himself. And that's a good thing! The fact that he did not return immediately now shows that there is something unspeakable, and that Zarathu himself will not put pressure on him.

Recently, Zarathu received another letter, the second letter Sheldon had sent him after six months or so, in which he said that he would be secretly looking for him recently, about a child. This is the first time that his own students have come to him to talk about children......

He obviously didn't accept apprentices anymore....... However, Sheldon's request for him is not just to take in an apprentice, but to raise him. But reading between the lines, there is a tragic sense of this plea: he is perhaps entrusting everything he has to a child whom Zarathu has not yet known, and begging him to accept this "great" task.