The three of them walked a few miles upstream along the river, and from a distance they saw several Baihuagu disciples on the road ahead.

"This Hundred Flowers Valley owner is really stingy," Gu Qingqiao rubbed his chin. "He sent people to guard everywhere. Are you afraid that we will pull out all the things in the valley and sell them?"

Cheng Yinji has been guarding the law formation for five years, and he has already stepped on this valley, and he is very familiar with people and places. When the disciples saw him, they asked with a smile, "Senior Brother Cheng, where are you going?"

Cheng Yinji saluted and said with a smile: "My two junior brothers are new here. I saw Xiao Heishi yesterday and liked it very much. I want to bring a few pieces back as a souvenir. I will take them to Heishitan."

"Black Stone?" Several Hundred Flowers Valley disciples looked at each other. One of them looked at the stone in Mu Xiyuan's hand and laughed: "Is something worthless worth your so much concern?"

Another person corrected: "Who said it was worthless, I heard that some people liked these stones a few decades ago, and they bought a lot of them from the owner of the valley, and they don't know what to do with them. But now, no one is watching. If you get it, no one cares about it."

The few junior brothers behind him all laughed.

Cheng Yinji chatted with them for a while, and the Baihuagu disciples let go, and the three continued to walk forward.

Walking along the river for a while, a few people gradually approached the cliff at the edge of the valley. Not far away, the river turned into a big bay, passing by a prominent cliff, and a rocky beach was exposed under the cliff.

There are strong colors everywhere in Baihua Mountain, but the rocky beach here is as dark as a shadow. The small black pebble covered the entire area. At first glance, it felt like a deep hole had appeared out of thin air, sucking all the colors into it.

"This is..." Mu Xiyuan looked around, "It seems to be the bottom of a pool of water."

"Well," Gu Qingqiao stepped forward and said: "This river probably flowed out of this pool before. I don't know why the river changed its course and went around from the side, which revealed Tan's bottom."

"Such a round stone should be formed by the scouring of the river all the year round." Qin Le looked up at the cliff.

"I see!" he said excitedly: "The river must have come from upstream, carrying these stones. The stones collided in the river and smoothed the edges and corners. After entering the big pool, the water flow slowed down, and these stones stayed there. here."

Cheng Yinji was fascinated by machinery and was not interested in these natural phenomena, but at this time, seeing Qin Le in high spirits, he nodded and praised: "It makes sense!"

Qin Le grinned happily and said again, "Look, there are traces of running water on this cliff. There should have been a waterfall in the early years. Isn't this the source of the river?"

Several people looked up and saw that the cliff above their heads was a petal of a morning glory.

"It's really possible!" Cheng Yinji visually inspected the location of the cliff and said, "It was probably because the waterfall was relocated and the river was rerouted in order to build the lifting stone slab, and this rocky beach was exposed."

Several people nodded yes. Mu Xiyun walked into the black rock beach, bent down to pick up a few small black stones, and made a sudden movement.

As soon as he moved, Gu Qingqiao's eyes immediately followed him away, and naturally he couldn't escape his eyes.

"Remember what?" he asked softly.

"I remembered. It was in the lake of Dragon Claw Mountain that time. I also saw this kind of black stone."

When his memory came back to his senses, Mu Xiyun held a black stone in his hand and explained, "That's when we went to pick the dragon's whisker grass. On the edge of the barrier, under a bunch of dragon's whisker grass, there was a black stone like this. At that time, I was still Picked up a piece and then lost it at some point."

Gu Qingqiao frowned, took the stone from Mu Xiyun's hand, and pulled him out of the rocky beach.

"What's wrong?" Mu Xiyun and Qin Le were a little puzzled.

"Xiao Le," Gu Qingqiao turned to Qin Le, "the day when you picked the dragon's beard grass, did your senior brother Mu feel sick before going into the water?"

Qin Le shook his head blankly and said, "It's been a good day all the time. We agreed to pick the dragon's whisker grass and send it to the town's medicine hall, and also go to Zuixianju to eat elbows and taste lotus wine."

Gu Qingqiao had a stern face, but after hearing what he said, his face couldn't hold back any longer. He reached out and knocked Qin Le's head, and said with a smile, "what's your reason for judging this?"

"It was originally," Qin Le rubbed his forehead, "my mother said that good appetite means good health."

Several people laughed.

Mu Xiyun already understood, looked at Gu Qingqiao and said, "You are suspicious, it was this black stone that caused the cold poison in my body at that time"

Cheng Yinji was a little stunned. He pulled Mu Xiyun to look up and down, and said with pity: "Oh, why was it poisoned at such a young age? Has it been cured?"

"It doesn't matter if it's in the womb." Mu Xiyun comforted him with a warm voice, "Just be more careful in normal times."

After speaking, he turned to Gu Qingqiao again: "I don't think so. Whether it was last night or just now, I didn't feel any discomfort when facing these stones. Don't scare yourself."

Gu Qingqiao nodded, still worried. He asked Qin Le to draw a few defensive talismans on the spot, wrapped a few small black stones, and found a new Qiankun bag, put the black stones wrapped in talismans into it, and tied them to himself.

The investigation was fruitless, and several people returned to their residences along the way.

Cheng Yinji and Qin Le were in front, and they were still discussing all kinds of machinery along the way. Mu Xiyuan looked at Gu Qingqiao and saw that his face was still gloomy. He gently touched him with his elbow and said, "Don't worry, I really fine."

Gu Qingqiao raised his eyes, "When you go back later, tell me in detail what happened that day."

"Okay." Mu Xiyuan smiled. Suddenly feeling a little itchy on his wrist, he raised his hand to straighten the cuffs, and the small rings made of grass stems were exposed from the cuffs.

"You still have it!" Gu Qingqiao exclaimed softly. He grabbed Mu Xiyuan's hand and pushed up his sleeve. The grass stem had been worn on him for a day and a night, and it had long since become dry and rough, grinding out a red mark on Mu Xiyuan's fair wrist.

"Quickly take it off, your hands are all red." Gu Qingqiao was about to pull, but Mu Xiyuan shrank his hand, snatched his wrist from his hand, and pulled down his sleeve to hide the grass ring.