When Aslan returned to the castle, the first thing he did was to go back to his father's library in the basement.

When Aslan walked into the library, his scalp tingled.

This library is really large, fifty or sixty square meters, and it is densely packed with all kinds of books.

To find something that could replace the Shuyan Stone in so many collections of books, for Aslan, who didn't like to read in his previous life, it was even more uncomfortable than killing him.

But Aslan was stunned for only a few seconds, and then he walked in and began to look for something that could replace the Shuyan stone, and the rest of the sulfur and charcoal were prepared by Simalan.

The days flew by, and when Aslan heard that the feudal era had been successfully upgraded, his face immediately showed great joy, but soon his surprised face also collapsed.

"Congratulations to the host for successfully upgrading the feudal era, and reward a random primary treasure chest. ”

"Because of the increase in the strength of the host, a mysterious force has descended on its surroundings to balance the world. ”

"The countdown to the arrival of the mysterious force is ten, nine, and eight...... Three, two, one......"

Regarding the birth of the mysterious force, Aslan just raised his head and glanced at it, and then continued to bury his head in the book.

The reason why Aslan didn't care about it was because he had already heard the key to the words of the Endless Lord System, the mysterious force, balancing the world, that is, it was not necessarily his hostile force, since it was not his hostile force, naturally he didn't need to worry, Fan Gu Zhai has always maintained a hegemonic position within a radius of a hundred miles, and they absolutely do not allow any forces that challenge their authority to exist, and when the time comes, the two tigers will fight, and there will be an injury.

During this time, he didn't find anything to replace the Shuyan Stone, but he asked Aslan to find a book about magic swordsmanship, so that he could finally get started with magic swordsmanship, which he could only rely on groping.

After Aslan roughly finished reading the book of the Magic Swordsman, he got up and accidentally hit the bookshelf, only to have the highest book on the bookshelf fall into the sky and smash it on his head.

"Damn, it's really unlucky!"

The book is ten centimeters thick, the size of A4 paper, almost more than ten pounds, and it is a problem if it is smashed on the head without any defense.

The book on the ground quickly turned its pages until one page was painted with strange stones.

Aslan picked up the book, looked at it casually, and was stunned.

"Burning Stone!"

After reading the introduction of Shuyan Stone, Aslan was stunned for a moment, and immediately picked it up and looked at it carefully.

The stone is also known as the flame stone. Colorless, white or gray crystalline, with glass luster, easy to ignite, doped with unknown materials will produce violent explosion, belongs to dangerous materials.

Although I am not sure whether the Shuyan Stone can replace the Shuyan Stone, from the above introduction, it should be similar, but in general, you still have to try to know.

As Aslan left the room, a black figure appeared on the bookshelf just now, and the black figure quietly looked at Aslan's back.

"Young Master, do you have anything to do with me?" asked the Butler Michelo.

Aslan said, "We don't have Brimstone and that Sulphur Stone in our inventory in Sky City. ”

Butler Michelo thought for a moment and said, "No, young master, you want these two things to do, that Shuyan stone is very terrifying, and if it is not handled properly, it is very likely to cause a big explosion." As for the brimstone, we have not used it. ”

"No, I want these two things to be used for some other purpose. Is there a way you can get these two things, the more the better. Aslan asked.

The housekeeper of Michelo thought for a moment and said, "Because we are very poor in Flying City, there were no merchants who came here to do business more than ten years ago. But if you go to the cities next door, there should be ores like sulfur and squeal stone, which are not very rare. ”

Aslan hurriedly said: "Then you hurry up and arrange people, no! It's better for you to go in person, or not, now the construction of Flying Sky City is inseparable from your guidance from Grandpa Michelo." Aslan kept shaking his head and arranged for the Michelo housekeeper to go, for fear of delaying the construction of the Flying City, after all, Jace's status in the Flying City is not as high as the Michelo housekeeper, and the area in the center of the town is fine, but in other places, no one will give him face.

Now the food and management of Flying City are all guided by the Michelo housekeeper.

As for arranging for others to go, he himself was a little uneasy.

"Young Master, if you are not in a hurry, we can inform some caravans and tell them what you want, and they should send it over. The Michelo butler suggested.

When Aslan heard this proposal, he thought it was a good idea, and he asked, "Then how long will it take?" ”

The Michelo butler counted his fingers and said, "This, we will arrange for someone to inform, and then they will arrange for a merchant to come and inquire about the situation, goods and quotations." After that, they go back to prepare the goods and send them over. The nearest city to us will take about twenty days to a month. ”

"A month! It's too long, I can't wait. Aslan directly rejected the proposal, now what he lacks most is time, he can't afford to delay too much time on such an important matter.

Aslan thought for a moment, then patted his head and said, "Then I can only go by myself." ”

After thinking about it, only he has the most time and the most suitable time to go, but now he thinks that he still lacks helpers by his side, and when he needs to use people, there are only these few.

When the Steward of Michelo heard Aslan's thoughts, he exclaimed, "How can this be done? As the lord of this territory and the lord of Flying City, how can you leave Flying City, and what if you encounter any danger on the road." ”

Aslan said, "It's okay! Just because I'm the city lord, there are some things that I still need to do myself." ”

"However, your safety ......" the Michelo butler was still a little worried.

"It's okay, don't worry, I'll take some of the recruits as guards. Aslan said, "You better quickly arrange for me someone who knows the route and knows how to do business with the caravan." ”

Butler Michelo sighed, "Okay, young master, when are you going to leave?" ”

Aslan thought about what he needed to do, and said, "When I arrange the things in the city first, I'll set off, about two or three days." ”

The Michelo butler nodded: "Okay, I'll arrange some of your trips." ”

"Okay. ’

This time, he will really go to see the outside world.

In the past few days since Michelo was arranged, Aslan has been studying the book of Magic Swordsman Essentials in the City Lord's Mansion, and he doesn't dare to do anything except eat and sleep, which is a bit of a magic barrier.

Aslan knew very well that since he was going to leave Flying City to go to the outside world, the stronger he was, the better, at least in the face of danger, he still had the power to protect himself.