If you look down from a high place, the Bianhe River enters the city from the southwest, turns eastward, and then turns northward, winding and twisting in the huge Biancheng, nourishing the hundreds of thousands of residents.

If the Bianhe River in the south of the city is still rugged and magnificent, it is a straight line in the north-east of the city.

In fact, the Bianhe River came out of the city from the northeast, but with that great change, the city in the east turned into a cloud of smoke, and even the lower reaches of the Bianhe River disappeared.

The city lord of Biancheng at that time, seeing that the river water had accumulated into a disaster, swung his sword and slashed, and a sword mark facing straight north became a new channel of the Bianhe River.

The remnant city of Biancheng is divided into north and south by the east-west Baizhang Street that Xu Chen went to that day, and there is also a wide street in the north-south direction, but now it has already become a remnant city, and it is no longer the grand occasion of the year.

10,000 years ago, Biancheng faces south and north, east and west symmetry, Biancheng City Lord's Mansion is located on the central axis of the whole city, the original majestic palace is the symbol of the City Lord's Mansion, and it is also the most magnificent building in Biancheng. It's just that now, the eastern part of the palace has long been blank, and the remaining western part has also been divided into a ruined city.

Today's City Lord's Mansion is only the remnants of the west building, although it has never been expanded over the years, but the emaciated camel is bigger than a horse, and the City Lord's Mansion is still the largest building complex in Biancheng today.

Today's city lord's mansion is located in the northeast of the remnant of Biancheng, the south gate is facing Baizhang Street, but the north gate is directly the north gate of Biancheng, this city gate is usually forbidden to pass, a side gate open in a place in the west is the city gate for the people to enter and exit.

Now in the central area of this complex, in a relatively tall hall, Zhao Bancheng, the city lord of Biancheng, is holding a hollow steel pipe at the moment, looking at it attentively.

"What can this thing be for?" Zhao Bancheng muttered to himself.

He lowered his head again, looked at the drawing that Xu Chen had drawn by himself in the blacksmith shop, and thought: "This style of painting, it seems that I have seen it somewhere......"

"Where the hell is it?"

Such hesitation should not have appeared on Zhao Bancheng's body, and the cultivators in the foundation building period could already be unforgettable, and Zhao Bancheng, who was a great monk in the late Yuan Infant period, would never forget what he had seen!

But now...... Zhao Bancheng is really a little blurry!

It's rare, but it's not impossible. Either the thing you see everywhere has a mysterious formation itself, and you can forget it when you see it, and you can only leave some vague traces in your mind with your advanced cultivation, or the things you saw at the beginning are recorded on the same amazing thing.

Either way, those things are absolutely extraordinary!

"It seems that this kid is really hiding a lot of secrets!" Zhao Bancheng muttered.

"Big brother, why are you so diligent today?" With a light laugh, a woman walked in from outside the temple.

The woman looks no more than cardamom years, her eyebrows are like distant mountains, her eyes are like morning stars, her long hair is shawl, tied with red rope at will, and she is dressed in a long aqua blue dress, slim and elegant.

"Ruoxi, can you not arrange your eldest brother?" Zhao Bancheng said with a blank look at the girl.

"Hehe, big brother, you're still embarrassed!" the girl smiled.

The girl stepped forward, hugged Zhao Bancheng's arm affectionately, and leaned her head over: "Huh, big brother, when did you become interested in these paintings?"

"What did you say?" Zhao Bancheng hurriedly grabbed the girl, shook Xu Chen's drawing, and asked, "Where have you seen something like this?"

The girl was caught, her eyebrows furrowed, and she cried: "Big brother, you hurt me!"

"Oh!oh! It's not good, tell me, where have you seen this thing?" Zhao Bancheng hurriedly let go and said apologetically.

"Hmph!" the girl glanced at Zhao Bancheng and said angrily: "My hand hurts, I can't remember!"

"Xiaoxi, my aunt, don't make trouble, okay?" Zhao Bancheng smiled bitterly.

"Forget it, you can find someone who doesn't mess around, I still have something!" said the girl, turning around.

"Qiushui Sword!" Zhao Bancheng said helplessly.

When the girl heard this, she really stopped, turned around, and said shyly: "People are girls, it's not good to dance swords and make swords......

The corners of Zhao Bancheng's eyes twitched, and he continued: "Add a whole set of Xuan Pin equipment!"

The girl hurriedly slapped Zhao Bancheng's hand, and said quickly: "Deal!"

Zhao Bancheng: "......"

"Hehe, isn't this a relic of the first generation?" the girl smiled when she saw that she was good.

"First relic?" Zhao Bancheng asked.

"Yes, I've seen it in one of the original codexes, but that codex looks a little strange, I've read it many times, and I can only remember some generalities, and I can't figure it out every time......" The girl picked up the drawing drawn by Xu Chen, looked at it, and said in surprise: "Huh? This thing is newly drawn?"

"Big brother, where did you get that?"

The girl knew that this drawing could never come from his lazy big brother.

"It's going to be similar to the original...... Who the hell is this kid!" Zhao Bancheng forgot to answer the girl's question for a while, but was immersed in the shock brought by Xu Chen.

The first generation in the mouth of the two is the first generation of "Bancheng King", that is, 10,000 years ago, when the great change came, the Biancheng City Lord in the late stage of Lian Xu, passed down from generation to generation, and now Zhao Bancheng is the seventh descendant of the Zhao family to inherit the "Bancheng King".

Plane paintings, from two-dimensional to three-dimensional, are not enough to add a few more lines, but without years of accumulation and the inspiration of Tianzhong's talent, it is difficult to make a breakthrough even if it is tens of thousands of years.

Nowadays, the paintings in the world of cultivators are not much different from the outside world, they are all two-dimensional, if they are ordinary people, living like slaves, how can they have the leisure to paint? That is, in Biancheng, there will be some painters from ordinary people who make a living from this. If a cultivator paints, after performing the spell, the things on the paper can even jump out vividly, so it doesn't matter if it is two-dimensional or three-dimensional!

And now that the things painted by Xu Chen are similar to the relics of the first "Bancheng King" 10,000 years ago, how can Zhao Bancheng not be surprised?

"Big brother, big brother!" the girl kept shaking her hands in front of the stunned Xu Chen.

"Huh?" Zhao Bancheng came back to his senses for a long time.

"Big brother, what do you want?" The girl was also curious about Zhao Bancheng's distraction.

"Oh, nothing!" Zhao Bancheng replied.

"Really?" The girl looked at Zhao Bancheng suspiciously, and then asked, "Big brother, where did you get this thing from?"

"Hehe, it's nothing, some things sent by the shadow guard just now!" Zhao Bancheng didn't tell the truth, and said casually.

"Oh?" The girl was still suspicious, but when she saw that her eldest brother said the word "shadow guard", she stopped asking.

"By the way, the second brother will be back tomorrow!" the girl said.

"Oh, so fast?" Zhao Bancheng was slightly startled.

"It's almost time, the second brother has been gone for more than half a month, okay? Anyway, if the second brother doesn't come back, everyone will be tired and lie down! With a big brother like you, people can be regarded as having fallen into blood mold......

The girl cried with tears in her eyes and complained about Zhao Bancheng's destruction of her, but Zhao Bancheng just smirked on the side and didn't dare to answer a word.

Seeing that the eldest brother didn't react, the girl also lost interest in the performance, and snorted angrily: "Hmph!

"Auntie, I also have to have the capital to be 'energetic'! the treasure house is about to be emptied by you, so ......"

The wail in Zhao Bancheng's heart, Xu Chen didn't know anything, at this moment, he was carrying a large bag with Yang Ziyun, and rushed back to Yun Ye's compound in a hurry.

"Yo! Xiaochen is back?"

"Huh, this is Xiao Chen's daughter-in-law, right?

"Look at this watery look, Xiao Chen, you are blessed!"

……

As soon as the two entered the hospital, in the front yard, as soon as they got off work, the housewives who were having dinner gathered around.

This was the first time Yang Ziyun appeared, and when she woke up in the morning, everyone had already gone to work.

In the face of so many enthusiastic aunts' jokes, even if the girl is tough, she bows her head shyly at the moment.

"Haha, look at this little couple, did you go shopping just now? Buy so many things? Come!

"No! no!" Xu Chen hurriedly refused with a smile: "There are not many things, I can afford it!"

"Ahh

"Ahh

"Yes, yes, yes, cook first, and when we eat, the two of us will definitely come to the door!"

"That's all right!"

"Say it! Say it!"

Xu Chen was in a hurry to go home for the experiment at the moment, and he really didn't have time to parry this group of enthusiastic aunts.

After supporting the aunts and aunts, Xu Chen hurriedly took Yang Ziyun back to his house, and plugged in the door bolt as soon as he entered.

"Haha, this Xiao Chenzi is really anxious! It's not dark yet, so he closed the door!"

"It's normal to be anxious!"

The same families saw Xu Chen's actions and hurriedly made fun of them.

"You...... This is...... Want...... What are you going to do?" Yang Ziyun in the house heard the words in the courtyard, her face turned red, she lowered her head, twisted her fingers, and asked shyly, as if she had a hint of expectation.

"Come and help!" Xu Chen didn't have the heart to guess what Yang Ziyun was thinking, and was busy taking out all the items in the big bag and small bag.

Black charcoal, yellow sulfur, and colorless and transparent saltpeter powder were placed on the desk by Xu Chen one by one.

A medicinal mill for grinding medicinal materials was quickly pushed up by Xu Chen, charcoal and sulfur were beaten into powder, mixed with saltpeter powder, and according to the optimal ratio, egg whites were added and stirred to form crystals.

Nowadays, I don't have many tools at hand to make the best granular gunpowder, but it's better than nothing, and when you run out of hand and thunder, you always have to do a few more defenses, right?

However, Xu Chen did not directly fill the can, but scooped a spoonful of black finished crystal particles and placed them on the floor.

Immediately, the lit torch was brought up, but there was no response!

"That's ......," R1058