For him now, that memory is too far away, after all, it was three hundred years ago.

But at this moment, the dream encounter in that fantasy realm reappeared as if it were yesterday.

Tianzun told him that there were two kinds of illusions, one of which was destructive, and the other was self-destructive.

But Su Lin knew that this statement was no longer applicable to the current situation, and the third situation had already appeared, which was a special case that was different from what Tianzun said.

At that time, Tianzun was based on the offensive illusion and distinguished the types of illusions, but the illusion created by the mixed yuan dao body obviously did not belong to this category, and the true martial arts Daluo Tianzhenjun who left this exercise was by no means left behind because he wanted to see all the people who saw the exercise explode and die, so he left it.

The purpose is different, and therefore the method of differentiation is also different.

The secret book is to convey information to the reader, to teach the reader something, not to let the reader die, so what exactly does this exercise want to teach him when this premise is established?

Why go through the illusion? What knowledge cannot be transmitted through language, but must be taught through illusions? What is the difference between fantasy and written knowledge?

Extremely close to the real situation, realistic test, this is the biggest difference Su Lin can think of.

If ordinary written knowledge is "to help the fallen grandmother to get up", then the illusion is to really let an old woman fall in front of you, and then remind you to "see the fallen grandmother to help up", and try to cover up the essence of its test, with the bargaining chip of life and death, so that the trapped person can look at the test with the most real attitude.

This answer surfaced almost instantly, and the moment Su Lin realized it, a strong intuition told him that this was the correct answer, and he had already gained insight into the psychology of Zhenwu Daluo Tianzhenjun when he wrote this strange exercise.

And the proposition of this exam is undoubtedly the truth of the five elements, how to use the power of the five elements to be correct, is the question that this illusion asks him, and how much he is willing to pay in order to practice is the key to whether he is qualified.

The scenes of the past experiments flashed in front of Su Lin's eyes one after another, the thousands of people who had transplanted the fourth Five Elements and died.

He once thought that since the five elements restrain each other, adding a fourth of the three attributes that can maintain balance will result in inevitable death, so what if the other two are added at the same time, so that the five elements are all complete in a short period of time?

In this way, can the human body achieve a harmonious and perfect natural cycle?

At that time, the view was tried many times in the past ten years, but without exception, the people who transplanted the last two attributes at the same time died, and the death was faster than the transplantation of the fourth one, which was also the main reason why Su Lin fell into a bottleneck.

But now, Su Lin saw his mistake, he actually regarded everything he experienced in this illusion as a method that could also be imitated in reality, so that he had always felt that Luo Tianzhenjun had integrated the method he realized into the illusion with symbolic means.

But the purpose of the illusion is not to teach people to cultivate, the knowledge of cultivation can be expressed through ordinary words, the illusion is more of a test of the determination to practice knowledge, so what determination does Luo Tianzhenjun want to let himself practice?

Su Lin got up and walked to the door, the moonlight outside the window was like water, the night breeze was slow, and he recalled his life in this illusion one by one, from the initial medical skills, to the later acupoint dissection, organ transplantation, and astrological research, everything revolved around the five elements.

The word mixed yuan seems to have revealed everything.

The next day, Su Lin set out on a journey to find his apprentice, and he found the reclusive disciple at the place agreed upon at the earlier separation, and told him his last thoughts.

And his disciples, like him, also accepted his own disciples to inherit the techniques of organ transplantation and maintain his own immortality, which was exactly what Su Lin wanted, he wanted to transplant the last two attributes of the organ at the same time, and there was just a shortage of manpower.

"Teacher, are you really going to do this? We've tried it countless times!"

"Needless to say." Su Lin spit out four words and looked at each other calmly.

He saw the other party's sad eyebrows, his eyes burst into tears, Su Lin patted his shoulders and comforted, "Life is in the world, there is life and death."

A lie, given to the disciples who have accompanied him for more than a hundred years, he is not only Su Lin's assistant, but also a partner in experiments, a companion who heals each other when he is injured or sick.

Even if people play games, they will have feelings for the NPCs in it, not to mention that the illusion is so real, life is so real, and the illusion of more than 300 years is far beyond the ephemeral self.

However, Su Lin did not waver, the weight of things cannot be compared with the length of time, even if the memory of reality is like the past for Su Lin today, ethereal as smoke, like layers of mist, but he still has to go back.

After all, this realm is temporary, and behind you is the place to return......

In the next few days, his apprentices and grandchildren arranged everything, Su Lin lay on the white bedcloth, a smooth bronze mirror hung above it, and he watched as the two of them cut through the skin with sharp iron blades, stimulating acupuncture points with exquisite techniques to maintain the vitality of the flesh.

The heart of the chest was beating, the kidneys and liver were carefully removed, Su Lin felt the three five elements qi bypassing the missing organs, and completing the new circulation through several acupuncture points, he was already used to this kind of surgery that did not match common sense.

From time to time, he spoke softly, instructed the other, and finally watched as the two internal organs were put into his body.

In an instant, the five elements were chaotic, and the tyrannical qi of the five elements flowed everywhere in the body, and the qi of mutual restraint was entangled with each other, turning into wisps, and the smoke without any attributes left the body, and the vitality began to flow like a waterfall gradually thawing.

Su Lin knew he was going to die, just like anyone in the experiment.

But he has no regrets, he trusts his own judgment, and he believes that death is rebirth......

The sour eyes slowly opened, and what caught his eye was those writhing strange words, and the wax and oil piled up like a hill under the lamp next to him, this completely unfamiliar scene made Su Lin mistakenly think that he had fallen into another new illusion, and the return after three hundred years made him completely forget the scene of this cave.

The dim, rancid, withered vine-filled cave made him curious, but he subconsciously turned around, but was stopped by a pair of warm hands, itchy hair fell down his cheeks, and a gentle and unfamiliar voice sounded in his ears: "Welcome back."

Greetings are like comfort, from strange to familiar.

Tears flowed silently like a trickle, and many of the three hundred years of phantom travel were erased, and the past was still blurred, but just like the departed returned to their homeland, and the regretful got what they wanted, Su Lin also understood that he had returned to the relationship he had been longing to exist, and that he was in the center of the silk net of fate involved in these people and things.

"I'm back." He replied.