Legend has it that night and day alternate between this world, sometimes tens of thousands of years of light, sometimes tens of thousands of years of darkness, the war between light and darkness runs through history, when Haotian wins, it is the bright world today, and when Hades wins, it is the arrival of the underworld.

The world has become extremely cold, and the creatures of the earth can only rely on geothermal heat for heating, and at that time, volcanoes, hot springs, and heat currents in the South China Sea will become the most precious resources, and countless wars will take place there.

The war will not last long, and most people will die, because of hunger, because of cold, because of desperate fighting, you must know that it must be an unimaginably cold and realistic world. And after a few decades, the whole earth will become unusually silent, as if it has entered a deep sleep that will never wake up, and only the strongest and most determined will survive, whether human or animal.

These cold and dark times are called the end of the Dharma era in Buddhism, and the Daomen are called the Hades Descending.

In the academy, the master used to call it ...... Eternal Night.

Half of the Daoist was blasted into half a coke, but the matter didn't end there.

It seems that the big picture has been started since 14 years ago.

Otogawa looked at the corpse in front of him, but he kept analyzing the information in his mind about the invasion of the underworld, the arrival of the son of Hades, and the eternal night......

The battle outside Chang'an City naturally couldn't hide from the people at the south gate of Haotian and the cultivators in the academy.

Soon, Li Qingshan, the master of the South Gate, and Yan Se, the rune master, arrived, and in the academy, the second gentleman, Jun Mo, appeared on the barren mountain.

Arrived almost at the same time.

"Mr. B, are you alright?"

Yan Se knew Yi Xiaochuan's strength, looking at the battle screen just now, looking at the chaotic scene around here, this is a battle between the great cultivators of the Five Realms!

"I'm fine, a seriously injured and dying veteran can't bother me. Listen to him himself, it comes from the knowledge of the watch, do you know?"

"Was that light the apocalypse just now?" Mr. Two was wearing a high crown as always, his body was straight, and the sword in his hand was also wide and square.

"It should be. ”

The second gentleman looked puzzled and said, "Then why are there two apocalypse?"

"Because...... There's another one I made!"

“......”

Mr. Two walked in a few steps and looked at the corpse that was scorched by thunder, and said in confusion: "This injury...... It's like being slashed by Uncle Xiao's Haoran sword......"

Yan Se looked at the corpse for a long time, raised his head and said in a deep voice: "This person is a person who knows how to watch and watch, he was severely injured by Mr. Ke back then, but he didn't expect to live to this day, and he still has such combat power." They...... Haven't you been down for more than 20 years?"

"Oh, it turned out to be them! A group of rats dared to appear in Chang'an. ”

"But now it's down, not only coming to Datang, but also preparing to step into Chang'an City. Li Qingshan's expression was solemn, and then he said to Yan Se: "Senior brother, what are you hiding from me?

"It's not a big deal, and there's nothing to hide, I just asked Mr. B to prepare to refine the Tongtian Pill. Master, too, agreed. Yan Se said very lightly.

"Tongtian Pill, that's the non-transmission medicine of Zhishouguan, and there are not even a few pills of Zhishouguan......"

"Since our predecessors can refine it, we can also copy it. Yan Se said.

Li Qingshan's eyes were very different when he looked at Yi Xiaochuan.

......

The mountain behind the academy.

After more than twenty failures, Han Li respectfully placed several small bottles in front of Yi Xiaochuan.

"Master, according to what Chen Pipi said, the elixir refined this time has eighty percent of the medicinal effect of the Tongtian Pill, and as long as you experiment a few more times, you can refine the perfect Tongtian Pill. ”

Yi Xiaochuan took out a black pill, put it in his mouth, closed his eyes and felt it, the Tongtian Pill gradually melted in the abdomen, turning into a spring stream-like fresh medicinal power, flowing slowly in the body, moisturizing the five internal organs and six internal organs, and even knowing the sea and dantian.

"The materials are insufficient, even with the assistance of the Palm Heaven Bottle, one grain can be refined every two days. However, this elixir is really strong, and I have already succeeded in building the foundation, Master, what should I do with this follow-up exercise? I can't learn the snow mountain qi sea of the academy!"

Han Li rubbed his hands together and waited for Yi Xiaochuan's instructions.

"Some of the cultivation theories in the academy are worth learning, although the Tao is different, but you also have to know that all the laws are one, and the different paths are the same, and those theoretical knowledge will be very helpful for you to learn the Tao in the future. You first have a good feeling in the mountains behind the academy, you don't want to make progress in cultivation, there is a panacea, you can't be weaker than others in cultivation, but in terms of comprehension and Dao heart, you need to carve it well, which will be of great benefit to your future development. ”

"Yes, Master, I will study hard!"

Xiao Yi nodded, this apprentice received it well!

Although he has average talent in Taoism, his luck is really strong, and his alchemy talent is not bad, and more importantly, the "Palm Heaven Bottle" is considered to be the main one, and the elixir will be indispensable in the future.

After taking a few bottles of pills, Xiao Yi said again: "Since the Tongtian Pill has been copied, I will take it to the experiment to see what substances promote the change of the qualification of the human root bones, and the effect of the Zhangtian Bottle cannot be mass-produced, and now is the time to use the power of science and technology." More than a month, as little as ten days and eight days, I will be back. The mountain behind the academy will be very safe, and when I come back, we will go to Yue Guo and choose exercises for you......"

......

Penglai in the sea outside the magic capital.

In a well-defended laboratory.

Yi Xiaochuan hadn't closed his eyes for three days and three nights, staring at the experimental data with a pair of slightly bloodshot eyes.

"Eva, are you sure it's the same substance?"

[Master, pregnant women will secrete CPH4 in the sixth week, and the amount secreted is very small. For babies, the energy it contains is like an atomic bomb, and it is this substance that provides the necessary energy for the formation of the skeleton in the fetus, and acts on the development of the fetal brain, which has incomparably magical properties.

It is an important presence that gives the human mind, but for adults it is a drug that kills when inhaled in small amounts.

There is a small amount of CPH4 in Tongtian Pill, which will play a role in secondary evolution and development through unknown auxiliary medicinal properties.

This unknown auxiliary material requires further experimentation......]

"So, can CPH4 be batched?"

[Although the chemical structure of CPH4 is complex, it can also be synthesized, and the Camino people in the Force world discovered and synthesized this substance, but they did not succeed in applying it to human evolution, and almost all experiments failed......]

"But Tsutenmaru succeeded!"

Another day passed, and Otogawa had a small pile of crystalline sapphire-like things in front of him.

CPH4！

It is also the core substance of Tongtian Pill to transform the root bone of the human body.

Otogawa wants to use it, but further research is needed.

For this research process, Xiao Yi decided that he should be more ruthless......