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O'Brien devoted his life to the study of the "elixir of immortality", but it turned out to be a pity: it is said that the "elixir of immortality" was not refined, but he made himself nervous and often made strange theories.

O'Brien once publicly declared that alchemists should abandon the traditional idea of analyzing and reorganizing objective matter, devote more energy to studying the mysteries of the human body itself, and use their own ** and soul as materials for alchemy, so as to achieve the supreme state of immortality.

At that time, his remarks were regarded as a great rebellion by the "Alchemist Federation" and denounced as "heresy", but in Yin Jian's view, O'Brien's thoughts were actually in line with the way of "the unity of heaven and man".

The ultimate pursuit of both cultivators and alchemists is eternal, but they have chosen different paths. The cultivator is liberated by the dual cultivation of life and life, and the alchemist hopes to study the mysteries of the material element itself to obtain the key to open the door to eternal life, which is the "elixir of immortality", which is one of the three major problems of alchemy.

From this point of view, ordinary alchemists are closer to the "Outer Dan School" among cultivators, and O'Brien's thoughts are closer to the "Inner Dan School", so it is no wonder that they are not tolerated by other alchemists, regarded as heretics, and are persecuted.

"Only paranoia can succeed", O'Brien firmly believes that he is right, no matter how others ridicule and suppress, he has never wavered in the slightest, and after thirty years of painstaking study, he finally refined the so-called "elixir of immortality."

The ecstasy of success caused O'Brien to lose his cool, and in his eagerness to prove himself right, he took the risk of taking the "elixir of immortality" before the efficacy could be verified.

It is unknown whether he was immortalized as a result, but according to the Alchemists' Federation, the drug was poisoned and delirious soon after taking the drug, and became an innocent demon, for which he was hunted down by the Federation, and finally forced to hide in a cave deep in the Mysterious Forest.

The alchemists who pursued him followed him outside the cave door, and some of them entered the cave to hunt for O'Brien, only to be poisoned by him, and all of them died quietly in the cave.

The rest of the warlocks did not dare to venture into the cave to chase him, so they tried to force O'Brien out, but this guy seemed to be really immortal, smoked, burned, watered and poisoned, and the warlocks tried their best to force him out, but all of them were ineffective, so they had no choice but to bury a large amount of gunpowder to blow up the cave completely.

Unable to ensure O'Brien's death, the Warlocks placed seals on the cavern ruins and planted "strips of wood" around them in case O'Brien's allies or careerists who wanted to obtain the recipe for the Elixir of Immortality from him came to his rescue.

The warlocks' concerns were by no means unfounded, countless Tromur people had entered this forest with the same ambition for thousands of years, not to mention the "elixir of immortality", the vast majority of them disappeared in the depths of this dense forest, and only a few survivors were the Marquis of Cid and a few others, and they were all frightened, and they never set foot in the mysterious forest again in their lives.

Thousands of years have passed, and the seal of the cave has not expired, unless O'Brien is really immortal, his bones have long since turned into a piece of loess in the cave, but there are still people who remember the legend of the "immortal medicine", and the old man Baartman is one of them.

When Bartman decided to explore the "Demon Cave", he was still very young, and young people often do not believe in evil, but when he followed the footsteps of his predecessors to the mysterious forest, he was dumbfounded on the spot

After thousands of years of reproduction, the "strip tree" has now spread all over the mysterious forest through the root system, and it is impossible to find the exact location of the original "Sealed Demon Cave".

These tree-shaped alchemists are highly aggressive, and outsiders who trespass into the woods will be beaten by them, and most of them will not escape death.

Bartman was not unprepared, as one of the alchemists who had taken part in the hunt for O'Brien had left a record of manipulating the spell of the "Striped Tree", which, according to him, would open a path to the "Sealed Demon Cave" by simply reciting the incantation.

He tried to chant a spell in front of the woods, and the woods did stop attacking, moving away from a winding path.

Bartman and his companions happily walked down the trail, but the good times were short-lived, and when they reached the way, there was no passage in front of them, and the back road was blocked by a strip of woods, and just as they were bewildered, a catastrophe worse than getting lost came......

"The woods attacked us like crazy, and I was the only one who escaped." Recalling that expedition, Old Man Balmain still has lingering palpitations.

That day in the tavern, he especially warned Yin Jian: "Be careful of those crazy dryads, if you really can't think of a way to cross the mysterious forest, you can set fire to them all."

Yin Jian didn't like his Jianyì.

There are not only "trees" in the mysterious forest, this primeval forest stretches for thousands of miles, contains infinite natural resources, like a green treasure house. For a few alchemical runes, a single fire burned the entire forest to ashes? He didn't have this kind of stupid thing of losing watermelons and picking sesame seeds.

And he had two questions.

First, why did the spell that had been handed down by the ancient alchemists fail to control the tree? Is it the ancients playing a prank, or is there some incredible mutation of the "striped tree"?

Second, what happened to the ancient alchemists who originally created only a few dozen trees, but now they are flooded all over the mountains and fields?

Reading the "Notes on Alchemy" by the Marquis of Cide, Yin Jian generally knew how the "strip tree" was made.

First, choose a healthy tree towel soup tree) as the material, then engrave various runes for it, and finally inject the machine spirit to activate it.

According to normal logic, then, the "striped tree" will spread its branches and leaves in the spring, and the seeds will drift in the wind, and the seedlings that fall between the woods should be ordinary poplars, and not "striped trees" - unless an alchemist injects new souls into the seedlings.

In order to solve these two mysteries, Yin Jian decided to find a "strip tree" for field research.

As soon as the thought moved, the shadowless sword was released, and the green light quickly circled around the "strip tree" that smashed the puppet, cutting it off in an instant, avenging the short-lived "Pinocchio".

Yin Jian put away his flying sword and stepped forward, trying to peel off the alchemy runes from the "tree", but the result was a great surprise to him, the "Heluo Heavenly Technique" showed that there was no magic circle on the tree to peel off

released a photo of the Dayan Divine Technique, just now it was obviously a "three-grade tree demon", but now it turned into an ordinary "beech", Yin Jian was suddenly stunned, what is going on?

General Grass squatted down, stretched out his slender hand to caress the low bushes near the stump, concentrating on the spiritual waves of the grass and trees, and after a while, he showed a sudden look, got up and said to Yin Jiandao:

"Master, the 'tree' that you cut down just now is just a temporary alchemy beast, once it is cut down or 'wound', the spiritual energy provided is exhausted, and they will turn back into ordinary trees."

"Who created these temporary strip trees?"

"It's those primitive, permanent stripe trees."

It is not difficult for Yin Jian to understand the difference between a "permanent stripe tree" and a "temporary stripe tree". The rune inscribed on the former is a "self-sufficiency array", which can absorb the free spirit children in the forest to form a spiritual energy cycle, and does not need to provide additional energy; The latter's circle circuit is incomplete, and it is necessary to obtain activation psionic energy from companions through guò "winding", and when the psychic energy is exhausted, it is impossible to continue fighting.

"The question is, how did this weird symbiotic relationship come about?" Yin Jian touched his chin and groaned, "Tiaoshu itself is a kind of alchemy beast, could it be that the alchemy beast will also create the same kind, just like a person bitten by a vampire will become a vampire." ”

This assumption he himself finds ridiculous, compared to demons with independent wills, "alchemy beasts" are more like "machine qì people", most of them do not have complex thinking skills, can only move according to the pattern set by the creator, and are unlikely to reproduce themselves.

General Grass also felt the same way: "It stands to reason that it won't, otherwise this planet would have become the world of alchemy beasts a long time ago."

"Maybe someone or some mysterious force is behind the scenes, trying to deter us from exploring the mysterious forest......" General Juku looked around warily.

"There is also a possibility, the primordial tree, through guò absorbing the essence of the sun and the moon or the soul piercing and snatching away the way to awaken self-consciousness, break away from the alchemy beast, enter the ranks of demons, and it is not surprising that you can use alchemy." General Yoo added that this was the case for her herself.

"Leave that aside for now, Grass, do you have a way to tell the difference between a long striped tree and a temporary striped tree?" Yin Jian asked.

General Grass shook his head and smiled bitterly: "The two trees look exactly the same, I can't tell the real from the fake, unless I cut them all down, the primordial tree will not become an ordinary tree after death, and there should be alchemy runes on its body." ”

Yin Jian felt a headache when he heard this, Xiaocao's method was theoretically correct, but it was not operational at all.

Due to the existence of the trees, the whole forest forms a very tricky "chain effect".

As long as you save a permanent tree, you can turn all the surrounding trees into temporary trees, and the temporary trees can also wind up the surrounding trees, so that the chain is like a plague infection, and it is like a "pyramid scheme", the whole forest is unfolded by the "permanent tree".

For example, the "temporary stripe tree" he cut down just now is powered by the red eucalyptus tree next to it, but the red eucalyptus tree is only a temporary strip tree.

When he was worried, General Liu's eyes lit up: "Master, I have thought of a good way"

"Xiaoyanagi, do you have any good ideas, come and listen." Yin Jian asked curiously.

General Liu smiled mysteriously: "My method is a bit whimsical, let's not say much about it, after verification, the master will naturally understand." ”