What is recorded in this jade slip is not only a Dan Fang, but also a passage left by the owner of this secret realm, telling about one of his adventures. The master of this secret realm calls himself the Lord of the Underworld, a tenth-order monk, and an eighth-order Dan master. After years of tracking, he found that sword whales often live in the deep sea below 10,000 feet and do not easily surface, so people have always thought that it is relatively rare. The sword whale is a sea beast that belongs to the existence of the ocean overlord, not only large, but also swims extremely fast, and the impact is also strong, it often lurks in various seaweed bushes, coral holes and other places on the bottom of the sea, and when it finds prey, it jumps out, either stabbing the opponent with a spear-like bone spur with a sharp head, or slapping the opponent with a huge tail to stun the opponent, or the body rotates rapidly in the water to form a turbulence to affect the opponent's swimming, and then it takes the opportunity to attack the opponent. The sword whale is very alert, and after launching a round or two of attacks on the opponent, it will accelerate its swim away and avoid the opponent in search of the next prey. At such a deep seabed, the actions of human monks are greatly affected, even the late-stage power of the spirit building like the Lord of the Underworld cannot teleport, and can only rely on swimming to move forward, and if it is not a water monk, the resistance of the sea water is extremely great, and the speed is also greatly reduced, unless there is some magic weapon to avoid the water to ignore the resistance of the water. The most important thing is that even if it is a spiritual cultivator, it is impossible not to breathe at all, it is okay to stay in the water for a day or two, but after staying for a long time, you must breathe, these factors greatly restrict the effect of the Lord of Hades to observe and study the sword whale, which makes it very troublesome. In order to solve this problem, he returned to the mainland in search of a magic weapon to avoid water or an elixir that could prolong his underwater stay.

He almost ran all over the four domains, looking for a variety of magic weapons and elixirs, but they were not too ideal, and the most effective was only to allow him to stay underwater for a longer time, but not to greatly improve his underwater speed. Just when he was at a loss, he met a "madman", this crazy guy was also a Danshi, and the two met at a small exchange meeting held between Danshi. At that time, the man was recruiting Danshi as a partner, saying that he had a very powerful idea that could greatly improve the abilities of human cultivators, so that the ontological abilities of humans could be infinitely close to the ontological abilities of demon beasts. This person was only a seventh-order cultivator and a sixth-order Dan master, so his remarks were considered crazy and unrealistic by other Dan masters, especially high-level Dan masters. But the Lord of Hades heard something that matched his own assumptions, and he found the man privately, and talked with him for a long time, until at last the two found a common voice, and succeeded in coming together.

The two stayed together and studied for hundreds of years, killing tens of thousands of demon beasts in order to test the medicinal properties, and finally found a way out from repeated failures, and successfully refined an elixir: according to the different ingredients used, it can be transformed into different demon beasts for a period of time, and temporarily have the ability of this demon beast. It's a pity that the two of them can only refine the highest-level seventh-order elixir in the end, and transform themselves into seventh-order demon beasts, and the maximum strength they exert is only equivalent to the seventh-order demon beasts, which is indeed a great help for the madman who has not yet built the spirit, but it is a little too much for the lord of the underworld in the late stage of spirit building. However, even so, it would be of great help to the Lord of Hades to study the sword whale, at least he could turn himself into a sea beast and move freely in the water and stay for a little longer. Even, he tried to refine a few elixirs that could transform into sword whales, transformed himself into a sword whale, and personally experienced the life of a sword whale. There is another disadvantage of this transformation elixir, that is, the body size of the demon beast will change, and it can only become a demon beast about three times the size of the human monk's body at most, small, small is no more than three times the size of the human body, and large, no more than three times larger. The Lord of Hades was transformed into a miniature sword whale, and when he appeared in the form of a sword whale, he really attracted the strange eyes of many other sea beasts.

With the passage of time, the two continued to improve the efficacy of this pill. That madman was too focused on creating all kinds of strange pills, which delayed his normal cultivation, and he couldn't even succeed in building spirits, and he died early. By the time the Lord of Hades was approaching, he had already improved this pill a lot by himself, for example, the person taking the pill could control the body shape at will, and it could change into the same size as the target demon beast, but the duration might be much shorter, and the specific duration was related to the person's own cultivation and mental strength. The refining process has also been simplified a lot, and some unnecessary steps and dispensable materials have been eliminated, which has greatly increased the success rate of this pill.

After reading the origin of this Dan Fang named "Bailing Transformation Pill", Lu Yi withdrew his spiritual power from the jade slip and let out a long sigh. This lord of the underworld is really a freak, his style of acting is indeed an unusual person, probably only such a persistent and crazy person, can continue to innovate, just like the white madman he came into contact with in his early years, isn't he also obsessed with the formation for many years, and only then did he create a strange formation like the iron wall and the end of the world?

Next, Lu Yi began the process of comprehending the Bailing Transformation Pill, because Lu Yi had already learned about the birth process of this Danfang from the account of the Lord of the Hades, so many things were relatively simple to understand, plus the experience of the Lord of the Hades for the previous improvements of this Dan Fang, Lu Yi had a quick grasp of the refining steps of the Bailing Transformation Pill, and he also had a general understanding of some deep meanings and subtle changes. I don't know how long time has passed, when Lu Yi woke up from the enlightenment again, he was already forty percent sure that he could become a Dan, the only thing he lacked was strength, this Bailing Transformation Pill was a seventh-order Dan formula, if Lu Yi was now a seventh-order Dan master, he would have at least sixty percent of the certainty of becoming a Dan.

Lu Yi looked at the Dan furnace again, it stands to reason that this level is undoubtedly about to become a Dan, but Lu Yi feels that he doesn't seem to be able to complete this challenge, it is a seventh-order pill, and he is not sure at all. He squatted in front of the Dan furnace with a sad face, while stroking the Dan furnace with his hand, while pondering there, even if this Dan furnace is a treasure weapon, which can increase a certain chance of becoming a Dan, but first, the refining process of the Bailing Transformation Pill is very complicated, and it requires a lot of mental power, and it will definitely be difficult for him to support it without any supplement;

Lu Yi suddenly thought of Nan Qingyun at this time, and had a different opinion in his mind, not all the people who came to this secret realm were Dan masters, if people who came didn't understand alchemy, how could they break through? Could it be difficult to be trapped here alive, no, the Lord of the Underworld must have other arrangements. Before, my thinking was fixed on the existing train of thought, and I only thought about things related to pills, but this secret realm was not only for Dan Master, there must be other way out!

Thinking about this, Lu Yi felt that his thinking suddenly became clear, so he entered the secret room in the early stage and placed so many elixirs and pills, if he didn't get it, it would be some kind of reward, so that later generations could bring out some of the secret recipes of the Lord of the Underworld to continue to carry them forward. Thinking of this, Lu Yi couldn't help but make the same old mistake again, and regretted that he couldn't bring those treasures over.

Lu Yi began to circle around the only two items in the Dan room, trying to find some clues. First, I came to the big box that Lu Yi couldn't open, this box was not gold, not jade, not wood and not stone, I don't know how many kinds of materials were made of composite materials. Lu Yi tried to lift the lid of the box again, but found that his efforts were still in vain, the lid of the box did not move at all, and the spiritual power could not penetrate into it, did he really want to mobilize spiritual power? But how to use spiritual power to open this thing? Do you instill spiritual power into it? Lu Yi stroked the entire box up and down, but did not find any tricks, he couldn't help but be a little discouraged, stretched out his palm heavily and slapped the lid of the box, muttered a sentence in his mouth, and returned to the Nadan furnace again unwillingly. Since the box can't be opened, let's study this Dan furnace again.

Lu Yi stood on the edge of the Dan furnace and looked up at the Dan furnace that was a head taller than him, for the maker of this Dan furnace, it was a five-body throw to the ground! The material of this Dan furnace is unknown, eight feet one inch high, six feet four inches thick, this size has been carefully measured, no more than one point, no less, containing a certain amount of heavenly way. The furnace has nine ears, carved nine lifelike dragons respectively, and the teeth and claws are inlaid on the top of the furnace lid to represent the head of the sun, making a shape of nine dragons competing for the sun; What's more amazing is that these dragons and phoenixes on the Dan furnace not only play a decorative and load-bearing role, but also the fire control center of the entire Dan furnace: the beaks of the four Tianfeng are facing the center of the bottom of the Dan furnace, and the Tianfeng opens its mouth to make a chirp, which is the fire point of the entire Dan furnace, and the four phoenix beaks should be able to switch the fire on and off separately to adjust the size of the fire and the temperature; Lu Yi has also used a lot of superb Dan furnaces, but the Dan furnace with such an ingenious design is still the only one Lu Yi has seen in his life.

"It would be nice if I could take it as I already have it!" Lu Yi looked at this peerless treasure in front of him greedily, and couldn't help but let out a sigh, but as soon as the words came out, Lu Yi immediately jumped in shock!