Lucien picked up a quill and drew two lines on the paper. "First of all, I admit that the system of relativity is very imperfect. It cannot explain inertia. It is also limited to the uniform-speed reference system and cannot be extrapolated to the uniform accelerated frame of reference."

"However, regarding the question that you presented, it is not a paradox in this case. Here are the timelines of the brothers, let's analyze them respectively. For the elder brother to fly away with a speed close to that of light, he would need an acceleration from stillness to his eventual speed, which is a process that cannot be neglected. If he intends to return, there would be another acceleration process in the opposite direction. It has to overcome inertia and cannot be neglected, either. In the meantime, considering the principles of relativity, the younger brother never overcame inertia…"

While analyzing, Lucien calculated with hypothetical data. The simplest approach was to explain inertia and gravity with the general theory of relativity, but Lucien couldn't do it just yet. He could only slightly introduce the concept and then calculate the two timelines with his knowledge in calculus to reach a result.

"… Therefore, the elder brother would be younger than the younger brother. To be more exact, his body changes were slowed down…" Lucien concluded.

Oliver rubbed the quill and read Lucien's calculation carefully. In the end, he nodded, "It was immature of me to have overlooked acceleration and deceleration. However, if his brother does not return but keeps wandering in space, after he reaches a stable speed, which one of them would be younger?"

"It's a moot question. If the elder brother does not return or meet his younger brother, they would be in two different reference systems and could not be compared, like two people living in two utterly unrelated worlds. They have their own lives, but they do not depend on each other." Lucien smiled and pointed at the air nearby. "Perhaps, there is such a real material world right next to us. It overlaps our world, but they have absolutely no influence on each other. Chances are that some people are holding a lively ball exactly in this place of that world."

Fernando did not find anything wrong with Lucien's explanation. However, he became solemn after hearing the random example that Lucien came up with. "That's a strange thought. If such a world does exist, our studies on time and space will be only at the beginning phase, because it's hard to imagine that two overlapping worlds that are both made of materials do not affect each other."

Lucien hurried to shake his head. "It's just a random thought. There's no need to ponder on it. It is not of any theoretical background or actual significance."

In his carelessness, Lucien proposed part of the content of a certain view on time and space in the spirit library. However, it was just an unproven speculation that was not appreciated by the mainstream.

"Then, we will move on to the next question…" Oliver opened his mouth again.

After extensive communication, since the relativistic effect had been proved by the accelerated particles, Oliver accepted the system for now, but he also reached a consensus with Lucien and Fernando that it was still an imperfect theory. Being that according to the theory, time flows slower on artificial planets than it does on the ground. However, according to actual data, the opposite is true.

"In any case, we have finally made a huge step on this path. I have a feeling that it will be a major reform in the macroscopic field, and we need to direct other arcanists carefully. Hehe. Lucien, you've shown remarkable abilities in both microscopic and macroscopic fields. It will be a dilemma for you to choose your legendary class. Other people's problem is that they can't find or construct a legendary class that befits their cognitive world, but you are wavering between two choices. How they will envy you!"

Oliver praised him, "I'll submit the matrix of transformation as soon as possible so that it will be published in the next issue of 'Arcana'."

Lucien had been cautious about the problem and explained everything based on experimental results and actual phenomena. After all, it was possible that the relativistic system or the quantum mechanics system suddenly proved unfit for the law of this world.

Soul, spiritual power, space barrier, world feedback, magic models and everything else reminded him that this was a world which seemed the same as Earth but might differ greatly in critical fields.

However, since he could find better approaches to study them, Lucien could only slowly grope forward on his current path.

After ensuring his relationship with Natasha, Lucien had a more detailed plan about his future path. He was planning to adopt a more conservative attitude. After all, he was no longer alone. Which meant that he would focus on quantum mechanics and use relativity only as assistance during the construction of his cognitive world later, and that he was ready to modify the theory of relativity anytime according to quantum mechanics.

At least, according to Lucien, quantum mechanics was the only theory that could explain the differences between the two worlds, including magic, spiritual power and bloodline assimilation, when they had a lot of identical parameters.

Now that he was taking a bet, Lucien preferred quantum mechanics to the general theory of relativity!

Of course, the gravity control and time control that the general theory of relativity brought were something that Lucien could not abandon, either.

"The new alchemy is not perfected yet, and the construction of a legendary class is far away. I haven't thought much of it yet." Lucien speculated that the legendary class should be something like 'Atom Control', which would lower the demands on his studies of 'fission' and 'fusion'. Chances were that 'Atomic Fission' and 'Eternal Blaze' would be the fundamental magics of the class, like 'Spirit Confinement' for Demigod-lich and 'Element Disintegration' for Hathaway.

Lucien did not say anything else. He suddenly changed the topic. "Your Excellency Oliver, I'm told that you were studying the Dark Dragon Lord. Have you found anything?"

Since Lucien proved himself to be a master of the field after submitting 'Report on the Changes of the Godhood of Ell', Oliver did not hide anything but said directly, "I met many problems. The moment the Dark Dragon Lord leaves his alternate dimension and enters the main material world, his godhood will decline. It seems that the power of faith cannot be imposed on him against the space barrier. So, he can only resort to his previous accumulation."

"But why is the Saint Truth not affected at all? Is this the difference between the Fake Gods and the True God?"

Although he was talking about the True God, Oliver showed no reverence. God for him was just a noun and a target to research on.

Lucien did not understand either. Recording what Oliver said in his note, he bid him farewell, ready to leave 'Thunder Hell' and went to apply for the files.

"Evans, wait a moment." Oliver suddenly stopped Lucien.

Lucien looked at Oliver in confusion. He was not familiar with the guy. What else could they talk about?

Oliver smiled, "I made certain mistakes recently. Therefore, I intended to write an opera as an apology for Florencia. Evans, you are the best musician. I want to cooperate with you. The tunes and melodies of the operas in the past were hardly satisfactory."

"I'll try when I have time." Lucien intended to build up his friendship with Oliver. It was always better to have one more supporter than one more enemy in the Highest Council.

Also, Lucien was also planning to write an opera as a gift for Natasha in the anniversary next year. Although he had the spirit library as his reference, he was hoping to adapt the works on a large scale. After all, it would seem more genuine if the gift that he offered to his love was actually created by himself. He could use Oliver's advice.

Receiving an affirmative answer, Oliver left in satisfaction, promising that he would send the script to Lucien in a few days.

After he left, Fernando scorned, "He will die in the hands of a woman someday. I'm even suspicious that Florencia will give him a critical attack when he is asleep after she is done tolerating him."

"A legendary sorcerer cannot be killed so easily…" Lucien was not worried about Oliver's safety.

Fernando did not say anything else. He turned to Lucien and said, "Don't speak to anybody after your relationship with Natasha. Take it slowly."

Although somebody could've guessed that Natasha celebrated with Lucien for his birthday last night from their traces, it remained obscure how close their relationship was since she left at dawn. Also, Lucien exposed his own traces on purpose, because he could've returned under a transformation mask.

...

In the Affair Committee, Lucien found Thompson.

"You want the files of the clergy of the Holm parish? Since when have you been interested in politics?" Thompson was rather surprised. In his eyes, Lucien was an ascetic sorcerer who was not interested in the outside world at all, as proved by the fact that he did not even have a partner.

Lucien smiled, "We all live in the Kingdom of Holm after all. If we want to run experiments in peace, we cannot ignore politics. Thompson, I believe I have the clearance, right?"

"Of course you do. Your clearance are only second to the members of the Highest Council now." Thompson asked his subordinates to find the files and gave them to Lucien. "You can't take them away or copy them but can read them here."

Lucien browsed through them and focused on the people who were willing to get in touch with sorcerers, recording the names on his spirit library.

"… Cardinal Richard, level eight, spoke that God loves people and cares about what they do but not who they are in his public sermon…"

Rubbing the name with his thumb, Lucien had a target.

...

In the Nekso Palace, Natasha met the nobles large and small according to the previous routine.

Although a brief conversation was not enough for her to grasp what everybody was thinking, it was something worth doing because it could deepen her impression on the nobles and their reverence for the crown deep in their hearts.

"Your Majesty, I have a summer resort in the suburbs. Would you honor us by your presence?" Duke James changed his previous rejective attitude and said to Natasha rather flatteringly.

Natasha smiled, "I will visit it if I have time."

As she expected, after her birthday celebration for Lucien was discovered by them, the liberals suddenly became much more enthusiastic and supportive of her.

After the baldy James bid farewell respectfully with a smile, Natasha finally asked Camil who just entered the hall. "Aunt Camil, what's the reaction of the Church?"

The Holm parish's reaction would be Sard's reaction!