The merit value required for each upgrade of the prison space is thirty times, plus the various buildings in the space are upgraded, the final merit value required is not much different from all the current total of Zheng Dong, and in addition to the merit value required for space promotion, another consideration is the completion of the Heavenly Dao task.

Because he inadvertently helped Heavenly Dao capture two immortal servants who were at the peak of the void, Zheng Dong inadvertently met all the prerequisites for promotion, and now the biggest obstacle that restricts him from raising the prison space to the fourth order itself is the three mandatory tasks, as well as the base treasure required for each new building.

After the Heaven and Earth Prison Space was promoted to the third order, Zheng Dong had not upgraded those buildings because of the lack of merit points at hand, and now he was considered wealthy, so he naturally upgraded all the buildings with 50,000 merit points.

If you want to upgrade the prison space to the fourth order, in addition to the merit points and the amount of tasks completed, you also need to build two more basic buildings, the Law Decree Honglu and the Drifting Station, the former is what Zheng Dong desires the most, and can use the powerful soul spirit as a raw material to continuously refine the evolution treasure.

Heaven and Earth Prison was promoted to the fourth order, and the Heavenly Dao Capture was promoted to the title of Capture Fast, and the Heavenly Dao task performed was no longer once a year, but changed to once every ten years, of course, the difficulty of the task performed was also greatly increased, and it was no longer limited to the world to which it belonged, and it was possible that several Heavenly Dao Catchers would work together to complete it.

The Drifting Station is a means of passage to other worlds, of course, the premise is that there must be a ticket to carry out the Heavenly Dao mission before you can pass and set off.

Unlike the previous upgrades to those buildings, if you want to build the Law Order Honglu and the Drifting Station, you must need a base treasure, and the base treasure is exactly something that cannot be exchanged in the altar, in addition to completing the task Heavenly Dao reward, you can only rely on chance to touch.

Because it is already a five-element immortal body, in order to exert its combat power to the limit, in addition to the existing fire and wood dual-system exercises, Zheng Dong also has to exchange the three-system exercises of gold, water and soil, and at the same time, Zheng Dong must also exchange the two-fold flesh cultivation method of refining dirt and essence.

After the completion of the exercises. Zheng Dong exchanged a few bottles of the best true yuan elixir and five bottles of soul cleansing pills during the foundation building period, the pills that increased the true yuan were not expensive, but the five bottles of soul cleansing pills cost Zheng Dong 10,000 meritorious points, if he didn't get a million meritorious deeds at once, Zheng Dong would not be willing to be so extravagant.

The best aspect of the Dharma body realm is the transformation of the soul, the soul cleansing pill is the best medicine to refine the soul, the effect of one pill is equivalent to Zheng Dong's penance for a month, each bottle has ten, five bottles of the soul cleansing pill can save Zheng Dong four years of penance, just if you want to complete the transformation of the soul. Zheng Dong estimated that he would have to take at least fifty bottles of Soul Cleansing Pill.

Even with the help of the Soul Cleansing Pill, Zheng Dong can digest and absorb one at most in a day, that is to say, with the help of the Soul Cleansing Pill, Zheng Dong can advance to the Ten Levels of the Law Body Realm in a year and a half, which is enough to make the vast majority of body cultivators cry.

Even in the Middle Ages, when all kinds of spiritual objects were not scarce and extinct, ordinary body cultivation wanted to leapfrog from the ninth level of the Dharma Body to the tenth level. It will take at least ten or twenty years, and from here you can see the benefits of having the Heavenly Dao as a backing, and the resources in the Heaven and Earth Prison make Zheng Dong's ascension speed ten times that of ordinary monks.

After completing the building upgrade and mixing the elixir, Zheng Donggang wanted to leave the prison space. Suddenly remembered Ao Jia who was trapped in the prison, thinking that he didn't have any grudges against himself, and he captured it here in order to complete the Heavenly Dao mission, and it was not the same thing to keep him in prison all the time.

Look at the pitch-black sea outside the island. Zheng Dong's heart suddenly moved, and he opened his mouth to ask the prison spirit, "Can the sea around the island accommodate living beings, what will happen if I put Ao Jia here?"

"The sea around Prison Island looks like seawater, but in fact it is a regular evolution, and ordinary creatures will immediately melt and decompose when they enter it. However, if you want to put Ao Jia into it, it is not completely impossible, but then you need to turn it into an island protection spirit beast, and the main body can only be imprisoned here, but if you pay a certain amount of merit, you can take his clone out of the world to help you do things. The prison spirit said with a flick of his tail.

"A dragon at the peak of the demon general, the combat power is dispensable for me now, and its doppelganger is estimated to be weaker than the main body, in fact, I just can't bear it a little bit. Zheng Dong said casually.

"After becoming an island protection spirit beast, Ao Jia will be blessed by the power of the laws of heaven and earth, and he will be able to rise to the realm of demon handsome in an instant, and I said before that those seawater looks like sea water, but in fact, it is formed by the laws of heaven and earth, Ao Jia has stayed in it for a long time to comprehend the law of the Great Dao, and the promotion speed is estimated to be faster than you, and he is expected to advance to the realm of the demon king within a hundred years, although the doppelganger only has seventy percent of the combat power of the body, but it is also very considerable. The prison spirit rolled his eyes and said disdainfully to Zheng Dong.

Zheng Dong listened to the words of the prison spirit, his mind moved, the whole body had disappeared in place, and when he reappeared, he had already reached the last cell, after several years of recovery, Ao Jia's injuries had healed, but because he had been locked up, the whole spirit looked very sluggish.

Seeing Zheng Dong appear, Ao Jia's spirit was suddenly shocked, ignoring the electric shock of the lightning law of the prison fence, he was covered in scorched black smoke and walked in front of the fence and said eagerly to Zheng Dong: "You said that if it is possible, you will release me, I am going crazy to stay in this small space, I miss the sea, I want to go out, as long as you let me go, I will agree to whatever the conditions." ”

"I also want to release you, but it's a pity that you are designated by Heaven to arrest, and I'm only an elite hunter now, unless I reach the first level of Xiaoqianban, I have the right to judge low-level prisoners, but if you want to be promoted to Xiaoqianbantou, the most optimistic situation is estimated to be a thousand years, but if you want to leave here, it is not that there is no chance at all, it depends on whether you are willing or not. Zheng Dong then told him about the guardian spirit beast.

Ao Jia's face was blue and red for a while, and he couldn't make up his mind for a while, but the limited freedom was exchanged for his lifelong imprisonment, but being promoted to the demon king within a hundred years was also a huge temptation for it.

"Isn't it true that no matter how high my cultivation is, there is no hope of breaking away?" Ao Jia asked with some bitterness after thinking for a long time.

Zheng Dong focused his gaze on the prison spirit, apparently asking it to give Ao Jia an answer.

"There are two opportunities for you to get rid of, the first is that you can continue to refine the bloodline and evolve in the sea area transformed by the law, when you advance to the Demon Emperor, the bloodline will automatically evolve from the dragon to the divine dragon, and you can get out of the prisoner status and be given the subordinate Heavenly Dao capture identity to get out of here, or Zheng Dong can be promoted to the head of the Xiaoqian class and upgrade the prison to the fifth order, or you can also be given a subordinate capture fast identity to let you get out of here. (To be continued......)