After taking a shower and washing off the stench from the sewer, Gu Shi sat on the bed and took out the crystal ball he had received from Field earlier.

This is the other-worldly version of the communicator that Gu Shi has been thinking about for a long time.

As early as the last time he met Wendel to attend the auction, he had considered whether there was a device similar to a mobile phone in the world.

Later, Gu Shi found some time to consult Field and got the crystal ball from him.

Although he had it for a long time, it was the first time Gu Shi used it.

"If I remember correctly, we should just input magic power into it." As he said that, Gu Shi began to inject magic power into the crystal ball.

After about two or three minutes, the crystal ball stopped absorbing magic power and began to flicker continuously.

Gu Shi was a little unsure whether this phenomenon was normal. After all, the frequent flashing of the crystal ball could easily make people think of a malfunction. He thought about his previous operation again and felt that it should be correct.

After waiting for a long time, Gu Shi couldn't help but start to have wild thoughts.

Speaking of which, isn't it a bit rude to disturb the teacher at this hour? Is he probably asleep, or maybe he's working on some important research?

After a while, when Gu Shi began to think about how to interrupt the crystal ball, its flashing stopped by itself, and Field's somewhat sleepy voice came from inside.

"What's up?"

Gu Shi first apologized and then explained his intentions.

"I'm sorry to bother you, Teacher. I'm in Root City and have a small problem that I'd like to ask you about. Is it convenient for you now?"

"It's okay, go ahead. I'm not sleeping, I'm just a little tired from studying alchemy."

After hearing what Field said, Gu Shi briefly recounted what he had encountered in Unique City these days, and then focused on describing the pattern he found in the sewer that was suspected to be a magic circle.

When Field heard Gu Shi say that there might be a magic circle covering the entire city underground, his voice became serious.

"A magic circle hidden in the sewer? Could you describe the appearance of this magic circle in more detail?"

"Due to time constraints, I haven't yet fully explored this formation. What I've discovered is that the main part is a hexagon, with a rune on each corner. They are..."

Gu Shi tried his best to describe these runes in detail with words, but he still couldn't restore their full appearance.

Field obviously knew that he could not make an accurate judgment just by listening to Gu Shi's description, so he decided to go to Root City in person.

"Tell me your current location and I'll go check it out tomorrow."

Gu Shi was a little surprised, but he still obediently reported the hotel's location and room number.

Then Field asked a few more questions with concern, asking whether his journey had been smooth and whether any accidents had occurred.

After chatting with Gu Shi for a few more sentences, they said good night to each other.

After Field ended the call, Gu Shi touched the crystal ball, thinking that he would have to ask him how to end the call later.

He took another look at Shufeng who was sleeping soundly on the soft cushion beside him, then Gu Shi adjusted the quilt, turned off the light, and soon fell asleep.

The next day at noon, Field arrived in Root City as scheduled.

Cheng Xuqing and Zhao Zhize heard from Gu Shi in the morning that his teacher would come over today. Worried that it would disturb their communication, the two of them hid in their room and played poker.

After welcoming Field into the room, Gu Shi got straight to the point and handed Field the map they had drawn these days. "Teacher, this is the magic circle I told you about."

Field took the map, looked at the pattern on it and pondered for a long time, then said, "Take me to the scene."

Gu Shi nodded, and then took Field to the sewer entrance.

Looking at the dirty sewer, Field frowned obviously, but still said nothing. He silently raised the shield and let himself float.

Before leaving, Gu Shi asked, "Teacher, what do you want to see? Is it the circular pattern or other lines?"

Field replied, "Lines will do. I need to research what material it's made of."

After hearing Field's needs, Gu Shi took him to the nearest location.

Looking at the black mud and garbage on the ground, Field waved his staff, and the road was instantly washed clean by the water.

Then he took out his tools, gently scraped off some powder from the black marks, and collected it carefully.

"Okay, let's go back."

After the two returned to the hotel, Field prepared to go back to the Mage Tower with the powder and the map hand-drawn by Gu Shi and others.

Before leaving, he and Gu Shi warned: "Don't publicize this matter, and don't go down the drain again. I will take care of the next thing."

"I understand, teacher."

Field's words undoubtedly confirmed Gu Shi's guess. It seemed that the traces in the sewer were a magic circle, and it was most likely not a good thing.

But since Field said that he would handle the matter, Gu Shi was not so worried. Even if the sky fell, there would be tall people to hold it up. He just needed to take care of his own business.

After Field left, Gu Shiye repeated his words to Cheng Xuqing and Zhao Zhize. The two of them were not the kind of people who didn't understand the situation. Since the strong man had told them not to go to the sewer anymore, they would not force themselves to go.

Cheng Xuqing felt a little regretful. "Alas, it's a pity that we have worked so hard for so long. Gu Shi, if there is any follow-up to this matter, you must remember to tell us."

Gu Shi said, "I know, I know."

Zhao Zhize directly arranged the next schedule.

"Alright, since we can't continue with this sewer thing, you should just do your missions and save money for the trip. We've been staying in the hotel for a while, and our savings are almost gone."

Cheng Xuqing looked as if the sky had fallen, "What! I remember it didn't cost that much!"

Zhao Zhize asked in return, "Don't you have to pay for your meals every day? Don't you have to pay for the hotel room rental? How can we afford to spend our savings that easily?"

Gu Shi raised his hand and said, "Well, how about I help you guys out a little?"

Zhao Zhize refused. "No need. You've already given us a lot. We can still earn this travel fee on our own."

Cheng Xuqing also agreed: "Exactly, and taking on quests in the Adventurer's Guild is also part of experiencing life in another world. It's a super classic adventure element."

Gu Shi smiled and said, "Okay then, but I'll be with you on the next mission. Is that okay?"

Cheng Xuqing made an OK gesture.