Not only was it useful to reconnect the formation, but it was also very useful in artifact forging. The grade of a weapon not only depends on the quality of the material, the refiner's cultivation, but most importantly, the comprehension of the array formation. Whether it was a defensive or an offensive weapon, the main function of the weapon was to see if the formation cast by the refiner was strong enough and if there were any major types of weapons that could be upgraded.

Gu Tianyu had once studied array formations under Sun Wukong's tutelage. Moreover, he had also heard from Sacred Mountain that Lin Ming hadn't been able to gain a better understanding of array formations. Now, Gu Tianyu felt that his understanding of array formations was becoming more and more shallow.

However, these matters weren't what Gu Tianyu was concerned about right now. Gu Tianyu's most important concern right now was to find his Master. As for studying array dao, it wouldn't be as easy as mastering it. It would take a lot more time.

"Martial Uncle, do you know who has the most formidable array dao technique in the Immortal World?" Gu Tian Yu asked.

"This person's cultivation level isn't that high, it's just that he's in the early stage of the Xuan Immortal Stage. Due to his obsession with array dao, he chose an uninhabited planet and continuously calculated and demonstrated the array formations on it. Many experts who don't know what's going on would suffer when they go there, and either get trapped by that person's array, or get their faces covered in dust and their elemental energy will be greatly damaged. This person can be considered a legend in the Immortal World. "

"Martial Uncle, please tell us who that person is. Which planet does he live on and is he close to us?" Gu Tian Yu seemed to understand something and asked anxiously.

"That person's name is Xuan Tianzi. The planet they live on was originally a planet without people, so Xuan Tianzi used his own name for this planet. Profound Heaven Star is about fifteen million miles away from Heavenly Heart Star. You can go there and try your luck, but Xuan Tianzi is a loner who only studies the Dao of formations. He does not lie to anyone. " Demon Ox said.

"Sigh!" I also want to go and take a look, but now it's up to me to find Master first. "

At this moment, Demon Ox saw that Gu Tianyu had changed the topic, so he chuckled and said, "Hur Hur, I'll tell you where your master went to so that you won't feel anxious."

It turned out that back then when Sun Wukong returned from the mortal world, he told a few people that he had gone into seclusion, and only these few people knew of his whereabouts. When Sun Wukong told them about his closed-door cultivation, he also told them about him taking in a disciple in the mortal realm. If not, how would this Demon Ox King know about Gu Tianyu? When he told them where he was going, Sun Wukong disappeared.

Sun Wukong's closed door seclusion was in another galaxy, at least a billion kilometers away from Heavenly Heart Star. Therefore, it was no wonder Gu Tianyu could not detect his master's trace with his spiritual sense.

After bidding farewell to Demon Ox King, Gu Tianyu left the palace. Now that he knew where his master was, Gu Tianyu was no longer anxious. Thus, he began to stroll around Heavenly Heart Star.

Heavenly Heart Star was truly worthy of being the ruling center of the Daoist Sect. The immortals on the streets all came and went, bustling with noise and excitement. The shops on both sides of the street were the gathering point for all kinds of businesses. There were those who sold weapons, those who sold medicinal herbs, and even those who sold all sorts of materials! At this moment, when Gu Tianyu saw this, he couldn't help but think in his heart, "Why are there so many merchants in the Immortal World?"

Walking on the street, Gu Tianyu was puzzled. It was impossible for the Immortal World to be like the Mortal Realm and trade for silver taels. He had only been in the Immortal World for less than a day. Furthermore, he did not ask Demon Ox about this matter back then. Actually, there were different levels of cultivation in the Immortal World just like the Mortal Realm. On the other hand, the large amount of spiritual energy needed for Immortal Cultivation didn't increase at a fast rate due to the immortal spiritual energy in the Immortal World. One would also need the assistance of immortal spirit stones.

Those immortal spirit stones could be mined, but those with status in the Immortal World had special Immortal spirit stones mines, so they could hire a lowly immortal to mine them. However, those immortals with lower statuses could only rely on trading business to exchange for immortal spirit stones.

Thus, Gu Tian Yu wanted to understand why, so he casually walked into a shop. At this moment, the shop owner was a skinny old man with a cultivation level at the late stage of the True Immortal Stage. Seeing that there was someone visiting, he welcomed them with a smile on his face, "Does the customer need to buy some pills? The medicine ingredients in this store are the most complete in the Immortal World. Take a look first, if there's anything I need, I will sell it to you at the cheapest price. "

At this moment, Gu Tian Yu nodded and looked at the items as if he was in the mortal world. The herbs here were truly dazzling in the eyes. However, these things were only ordinary items in Gu Tianyu's eyes. They couldn't be considered as expensive.

As such, Gu Tianyu wasn't interested in this matter at all. He only wanted to know what kind of currency the Immortal World used to trade for it.

However, there was a small jade token in front of each of the ingredients on the table. On it was the words' reconstructing a pill into 50 low grade immortal spirit stones'. At this moment, Gu Tianyu understood the currency used in the Immortal World.

However, what Gu Tianyu didn't understand was what these so-called immortal stones were. Furthermore, they had to be divided into upper, middle, and lower levels. This confused Gu Tianyu, so he said to the skinny old man, "Shopkeeper, please give it a try."

"What do the guests have their eyes on?" The skinny old man said with a smile.

"Yeah, I saw a medicinal herb. However, I would like to ask the shopkeeper first. Are all of these immortal realms being traded for immortal spirit stones?" Junior has just arrived in the Immortal World and is not familiar with it. " Gu Tian Yu asked with a smile at this moment.

"So it turns out that the guest has just arrived at the Immortal World. It's no surprise that he isn't familiar with it. In this Immortal World, immortal stones were used as currency. Immortal stones were divided into low-grade, intermediate-grade, high-grade, and top-grade. "One mid-grade immortal spirit stone can be exchanged for ten low-grade immortal spirit stones and one high-grade immortal spirit stones can be exchanged for ten mid-grade ones. According to this, one top-grade immortal spirit stone can be exchanged for a thousand low-grade immortal spirit stones." The skinny old man patiently explained to Gu Tianyu.

"Oh!" "So that's how it is, then is this immortal spirit stone useful for cultivation?"

"Of course it's useful! However, esteemed guest, you probably don't have any immortal spirit stones for your first visit to the Immortal World, right? "That's not a big deal. Guests can use things to exchange for immortal spirit stones or to dig those abandoned mines. However, those abandoned mines have already been excavated, and the chances of them being excavated are not high. Furthermore, those are only low-grade ones." The skinny old man said in a peaceful manner.

"Thank you, Manager!" Tell me this. How many immortal spirit stones do you think my ingredients are worth? " Gu Tian Yu took out a Grass of Immortality from his storage ring and asked.

"Grass of Immortality? Does the guest have Grass of Immortality? I've been in the Immortal World for thousands of years, but I haven't seen any Grass of Immortality. When the guest first arrived in the Immortal World, he already had Grass of Immortality. Can you tell me how this Undying Grass guest obtained it? " Seeing the Grass of Immortality in Gu Tianyu's hands, the skinny old man couldn't help but exclaim in excitement.

The Grass of Immortality had the ability to revive the dead. Even if one's body was destroyed, the Grass of Immortality could still be used to immediately recover. In the Immortal World, the Grass of Immortality was extremely rare. Even though the Immortal World was vast, there were only two planets with Grass of Immortality, and there were many powerful immortal beasts guarding there.

For most people, even if they found it, it wouldn't be easy to harvest it. The lowest cultivation level of those immortal beasts were all at the Xuan Immortal level, and in addition to the large number of immortal beasts, anyone who wanted to pick them would first have to see their own strength. Many people who wanted to try their luck there died at the hands of those immortal beasts.

"As for where this medicine came from, shopkeeper, you don't need to ask too much. Just tell me how many immortal spirit stones it's worth right now." At this moment, Xiao Yun didn't want to tell him that this was given to him by his master, in case this skinny old man pursued him relentlessly. However, from the little old man's gaze just now, he knew that this Grass of Immortality was definitely worth quite a bit of Immortal Spirit Stones.

"This … Honestly speaking, this Grass of Immortality is considered rare in the Immortal World. It's worth at least two thousand top-grade immortal spirit stones. "If the guest wants to sell it," the little old man said honestly.

"Alright, I'll sell it to you. You just need to give me 500 top grade immortal spirit stones." When Gu Tianyu saw the thin old man doing as he should, he also straightforwardly said.

For others, the Grass of Immortality was indeed precious, but for Gu Tianyu right now, even if he didn't have ten thousand Grass of Immortality in his storage ring, there were at least a few thousand.

"Really?" The skinny old man asked in surprise.

"Of course! Do you think I'm joking with you? " Gu Tianyu affirmed.

"Thank you, sir!" I'll go and prepare some top-grade immortal spirit stones for you. " The skinny old man saw that Gu Tianyu wasn't joking and was immediately excited.

Just like this, Gu Tian Yu's mood improved greatly. Not only did he know that the Immortal World used immortal stones as currency, but he also knew that the things in his storage ring would only cost tens of millions of top grade immortal stones.

But at this moment, for some unknown reason, Gu Tian Yu suddenly heard a strange sound of conversation. Moreover, it was a very confidential sound. This person, Gu Tian Yu was very depressed and didn't understand why he would hear such a damnable conversation.

"Right now, we should take advantage of the time that old black market devil is in closed-door training to finish off the demon realm. What do you think?" A low voice said.

"Highness, will we attract the interference of the Buddhist people if we do this?" Another woman's voice said.

"I don't think so. I think Buddhism should be watching from the side. Actually, it's not like Buddhism doesn't want to attack the devils. It's just that they were afraid that we would take advantage of the situation to take advantage of it, so they decided to endure it. " the man called His Majesty replied.

"Then, how will they deal with us when they take advantage of the fire to rob us? Besides, those old things don't necessarily support us now. At that time, if they were to cause a ruckus, it would not end well. The woman tried to persuade him.

"Humph!" I have long disliked those old things. Relying on my seniority, I have never placed me, the Jade Emperor, or your royal mother in my eyes. We're going to use this opportunity to beat them up. " His Majesty spoke out bitterly.

"Your Majesty, do you have any plans now?" the woman asked.

However, at this moment, he suddenly fell into a period of silence. Gu Tianyu also didn't hear anything. At this time, Gu Tianyu finally came back to his senses. He couldn't help but feel a burst of excitement in his heart. He didn't expect that he would be able to see the Daoist Sect clash with the Devil Realm as soon as he arrived in the Immortal World.

However, based on Gu Tianyu's current thoughts, "Who cares about what those people do, as long as it doesn't involve me, then it's fine. Right now, I should go to Princess Xian Yao's place first and take a look, at that time, I don't want her to say that I'm an ungrateful person."