"The underwater Dragon Palace of the Four-Winged Earth Dragon."

  Du Mu Xing Ling's eyes lit up, and he hastily said: "What are we waiting for? Let's set off now. The Four-Winged Earth Dragon is an existence comparable to a Saint, dominating the Tian Mo Ridge for hundreds of years, accumulating a staggering amount of treasures. If we obtain its treasure trove, our cultivation will undoubtedly advance by leaps and bounds."

  "It's not going to work, we'll have to wait a bit longer."

  "The Tongming River crisis is heavy, and the underwater dragon palace has not been opened for 500 years. We need at least three months to prepare in advance." Zhang Ruochen said.

  Huang Yanzhen also nodded, saying: "My current martial arts cultivation has reached the extreme realm of the earth, if I want to go to the underwater dragon palace, I must let my cultivation break through another boundary. Three months' time should be enough."

  Duanmu Xingling sighed: "Alright, indeed need to prepare more, I also want to continue to improve my cultivation."

  Huang Yanchen said: "There are only three of us now, and we still lack three people. Who do you plan to let join?"

  Zhang Ruochen's eyes narrowed, saying: "To join in, one must have strong power, and the martial arts cultivation cannot exceed the Tianji boundary. I happen to have three candidates, I will take some time to talk to them."

  "Alright then, let's prepare separately. Three months later, head to Tongming River and charge into the underwater Dragon Palace." Huang Yanchen said.

  Zhang Ruochen planned to wait until three months later before going to the underwater Dragon Palace, actually also wanting to take advantage of this period to cultivate the fifth palm of Longxiang's Banruo Palm to great perfection, making his own strength even stronger.

  After parting with Huang Yanzhen and Duanmu Xingling, Zhang Ruochen first went to the Merit Tower to exchange for four bottles of third-grade healing medicine and twenty pieces of Tempering Body Refining Tendon Dan, spending a total of 20,000 merit points.

  He then went to Tongsheng Mountain again, entered the ground-level gravity training secret room, and continued to cultivate "Xiangli Jiuzhan" while tempering his physical body.

  Last time he cultivated, he refined ten Tempering Bone and Muscle Pills, causing Zhang Ruochen's physical strength to rise from the early stage of Tianji Realm to the middle stage of Tianji Realm.

  This time, Zhang Ruochen exchanged twenty Tempering Bone and Refining Muscle Pills, just to further increase his physical strength once again.

  Martial arts originally cultivate both body and skill.

  Kung fu is important, but physical body is equally important.

  After his physical strength increased, Zhang Ruochen decided to challenge a more cruel cultivation environment and entered the Earth-level cultivation chamber, directly walking to the deepest part.

  Practicing palm techniques under thirty times gravity.

  Gravity increased tenfold, and pressure also increased by a large margin. Ordinary people can't survive in such an environment at all.

  "Hong Hong"

  The Gravity Training Room, where the sound of clapping hands never ceases. A new round of arduous training has begun.

  Half a month later, Zhang Ruochen walked out of his training chamber.

  Palm law, further enhanced.

  Can unleash eight palms at once, bursting out with eight times the power of Palm Technique, only one step away from mastering Palm Technique.

  At the same time, after refining twenty Bone Tempering and Muscle Refining Pills, Zhang Ruochen's physical body also showed significant improvement. Of course, it was still far from reaching the strength of a late-stage Tianji Realm warrior.

  After reaching the extreme boundary of heaven, the span of the boundary will become larger and larger, and the role of elixir in enhancing the flesh body will also become smaller and smaller.

  According to Zhang Ruochen's estimation, at least ten more Tempering Marrow and Tendon Pellets were needed to enhance his physical strength to the level of the late stage of Tianji Realm.

  Half a month of cultivation, Zhang Ruochen had already completely stabilized the boundary of his breakthrough and could freely control the increased power at will. Even without using the spatial domain, he didn't have to worry about his aura leaking out.

  "Whoosh"

  Zhang Ruochen's body flashed and he directly disappeared from Tongsheng Mountain. Not long after, he was standing outside the gate of Xiufu Secret Mansion, as if he had appeared out of thin air.

  "The speed seems to have increased again, with the fastest burst reaching 293 meters per second. Even compared to the top ten martial artists in the world rankings, I estimate that there is not much difference."

  Every time I level up, there's an indescribable sense of pleasure. As long as my strength is constantly improving, it means that my efforts haven't been in vain.

  Back at the Xiu Lian Secret Mansion, Zhang Ruochen prepared to rest for a period of time before heading to Tong Sheng Mountain to cultivate his palm techniques.

  Anyone who has been under several dozen times the gravity for a long time will be unbearable, and Zhang Ruochen doesn't want to practice palm skills and hurt himself, leaving hidden dangers.

  Cultivation requires gradual progress.

  During this period, Zhang Ruochen entered the inner space of the Time and Space Crystal, beginning his research on the Time and Space Secret Classics.

  Pick up the spacetime secret book on the silver paper placed on the stone platform, and slowly flip through it. With Zhang Ruochen's current realm, he can already read to the sixth page.

  As for page seven, no matter what method Zhang Ruochen used, he couldn't turn it over.

  According to the records of the Time and Space Secret Book, Zhang Ruochen can now begin to cultivate "Time Imprint".

  Time is much harder to control than space, with many uncertain factors. Zhang Ruochen does not plan to cultivate "time imprint" for the time being, and will wait until he reaches the Tianji boundary, when his cultivation is stronger, before starting to study it again.

  Now, the main effort should be put into the study of spatial memory.

  Due to time constraints, Zhang Ruochen has only learned twelve spatial seals so far.

  Zhang Ruochen decided to start learning a defensive intermediate spatial rune, the Cosmic Rune.

  Intermediate-level soul seals are more than ten times harder to master than basic ones, and they're extremely intricate and complex. If your spiritual energy is even slightly insufficient, the seal will fail, resulting in a complete waste of effort.

  Generally speaking, only warriors with spiritual power reaching the 30th rank can successfully engrave intermediate-level seals.

  The intermediate-level glyph of the spatial system is even more difficult and requires at least a spiritual force of thirty-five levels to have any chance of successfully inscribing it.

  Of course, the power of intermediate seals far surpasses basic seals.

  For example, a basic "Power" rune can only increase the weight of a war soldier by 100 catties.

  A mid-grade "Power" rune, yet it can increase the weight of a battle soldier by one thousand catties.

  In the martial arts world, what is most important?

  Of course, saving one's life is most important.

  Just like the black market Tianji boundary warriors who fought with Zhang Ruochen at the beginning, almost all of them had protective treasures. Once they encountered a life-threatening crisis, the protective treasure would form a defense and save their master's life.

  The protective treasures sold by Wu Shi Zhong are almost all made by the hands of master craftsmen, extremely rare and expensive.

  Buying a protective treasure costs at least 10 million silver coins, almost half of the wealth of an early-stage Tianji realm warrior. Moreover, most of them only have a one-time protective effect and cannot be used for the second time.

  Zhang Ruochen studied defensive intermediate spatial runes and also wanted to refine a protective treasure.

  The intermediate pattern is much more difficult to engrave than Zhang Ruochen imagined, taking half a month and wasting 10,000 sheets of spiritual paper before finally completing the recording of that one intermediate pattern.

  "Finally completed the first step, one big step closer to success."

  Apart from that one intermediate spatial rune, Zhang Ruochen also learned three basic defensive spatial runes.

  With his current spiritual power intensity, Basic Space Engraving can be said to be effortless, and it's easy to engrave successfully with just a light touch.

  Zhang Ruochen decided to engrave the defensive talisman on the surface of the space ring, making the space ring a defensive treasure.

  Engraving the first defensive space ring is the most critical, so Zhang Ruochen appears particularly careful.

  Despite this, Zhang Ruochen still wasted seven jade rings before successfully refining the first defensive space ring.

  This space ring is the most perfect spatial treasure that Zhang Ruochen can refine at present, with a storage space that is hundreds of times larger than all previous space rings.

  Moreover, it also has a recognition function, even if the space ring is lost, other warriors cannot open the space ring.

  The strongest is defensive power.

  Zhang Ruochen recorded three intermediate defense system talismans and thirty-three basic defense system talismans in the space ring. The power of these talismans alone was comparable to that of a ninth-grade true martial treasure.

  According to Zhang Ruochen's calculations, the Space Ring has a triple defensive effect, and at its strongest, it can withstand a full-force blow from a Tianji Realm Grandmaster.

  In other words, as long as Zhang Ruochen wears the Space Ring, he will have at least three chances to escape with his life unless he encounters a powerful opponent who has reached the Tianji Boundary's Great Perfection.

  Spending another three days, Zhang Ruochen successfully refined nine space treasures in one breath, which were three space rings, three space bracelets and three space pendants.

  In addition, the first space ring he refined had a total of ten space treasures.

  That's right.

  The space ring that Zhang Ruochen is currently refining can be considered a spatial treasure. Moreover, it's the lowest grade of spatial treasure.

  Those previously refined can only be considered as storage tools.

  Zhang Ruochen took out the two spatial wristbands and three spatial rings he had previously refined, tossing them to the ground as if they were a pile of trash.

  "For me, these spatial bangles and rings are nothing but trash, but for other warriors, they're priceless treasures. If I were to take them to the auction house in Tianmo Martial City, I should be able to get a pretty good price for them."

  To venture into the underwater Dragon Palace, many preparations are needed. Just having a defensive space ring is far from enough.

  Zhang Ruochen was just about to go to the auction house to bid on some top-notch defensive and offensive treasures.

  He did it as soon as he said it, Zhang Ruochen picked up the two spatial wristbands and three spatial rings on the ground, put them in his arms, and then walked out of the practice mansion.

  Before going to the auction house, Zhang Ruochen decided to go find Lei Jing for help first.

  So he came again to the Silver Robe Elder's Hall.

  When he saw Zhang Ruochen, Lei Jing's mood was excellent, but he still maintained the demeanor of a master, and said with a hint of arrogance: "Zhang Ruochen, what do you want to ask for help from your master again?"

  Zhang Ruochen clasped his fists together and bowed, smiling: "Master indeed has a good eye for things, your disciple does have something to ask of you."

  Lei Jing lightly raised her eyelids and rebuked: "What is it?"

  "I want to ask Master to come out and send a few things to the auction house in Tianmo Martial City for auction," said Zhang Ruochen.

  Zhang Ruochen absolutely cannot let outsiders know that the five spatial treasures were taken out for auction by him. Having Lei Jing take the lead is the best, at least no one dares to provoke Lei Jing.

  Of course, Zhang Ruochen can also hide his identity and take the five spatial treasures to an auction house for consignment.

  However, the Tianmo Martial City is not comparable to the Yunwu Commandery. There are many masters here, and there are no shortage of legendary martial artists at the Tianji boundary. If Zhang Ruochen is slightly careless, his identity will be exposed, and it will backfire.

  Lei Jing's eyes widened and he said: "This trivial matter, you also come to disturb the old man. It's just a few things, can't you just send them to the auction house yourself?"

  "Master, take a look at these few auction items first, and it's not too late to make a decision afterwards."

  Zhang Ruochen took out three spatial wristbands and two spatial rings and placed them in front of Lei Jing.