Ma Dian couldn't help but stretch out his hand and explained: "You must know that the medicinal residue is a very important thing in the medicinal materials, and some medicines, even as long as the medicinal residue, do not use the medicinal liquid, because the medicinal residue is not a leftover thing, but something that is difficult to refine." ”

"In the profession of re-alchemist, there is such a saying: It is better to spend ten years grinding a cup of soup than to refine Baidan in half a ring; ”

"In many cases, the effect of the medicine residue is often more powerful than the potion, but some lower-level alchemists cannot completely turn the medicine residue into a potion, and they cannot exert the medicinal effect of the medicine residue, but even so, a normal alchemist will not easily throw away the medicine residue!"

Hearing this, Xin'er scratched her head in embarrassment, because just now, Xin'er just threw away the separated dregs.

"Turning the dregs into potions is a process from quantitative to qualitative change. Like you, the method of throwing away the medicine residue directly is equivalent to directly abandoning the qualitative change, only focusing on the quantitative change, and the medicinal effect will naturally be much less. Ma Dian explained.

After listening to Ma Dian's explanation, Xin'er lowered her head silently and said with some embarrassment: "Okay." ”

Ma Dian touched Xin'er's head, "Now you should learn magic honestly, and when you master the fire element or wind element, I will teach you to refine medicine!"

"Really!" Xin'er raised her head excitedly, stretched out her little thumb and said, "A word is a certainty!"

Ma Dian also hooked Xin'er with his little finger and said: "A word is a certainty!"

In this way, Xin'er no longer wanted to be the teacher of the alchemist, but wholeheartedly helped Ma Dian grind the medicinal materials, fortunately, it was Nie Haitang who sent the medicine this time, in order to express his sincerity, Nie Haitang specially sent a lot of medicinal materials to Ma Dian, so that Xin'er would not be able to make medicine after being ruined by Xin'er.

Among them, there are many precious medicinal materials that can be used to refine precious medicines, and Ma Dian also accepts them in case of emergency.

After grinding for an hour, a bowl of "Guiqi Tea" was finally made, and the two of them stretched at the same time, preparing to rest, when suddenly, Xin'er felt a vibration in her chest.

Hurriedly took out the mirror in his arms, only to see eight words written on it: Assemble on the battlefield under the wall!

Ma Dian leaned next to Xin'er, looked at the eight big characters, and couldn't help frowning slightly, "What's going on?"

Xin'er shook her head, "I don't know, do you want to go and see?"

"It's so late, forget it, the ghost knows if the person surnamed Yu is not well-intentioned. Ma Dian resisted a little.

"No, Miss Yu, she's not a bad person, she must have made some major discovery when she calls me so late, and she must tell me to my face! No, I'm going to take a look, Brother Dian, you can stay here, lest someone knock on the door and find that we are no longer there, and it will be difficult to explain when the time comes." Xin'er said calmly.

"Then what's the matter, if you want to go, you must go together, if you want to go alone, I don't worry, and it's so late, no one should knock on the door. Ma Dian said.

"Okay, let's go together. Xin'er nodded.

"However, we have soldiers patrolling around here, how can we sneak out?" Ma Dian was a little puzzled.

Xin'er smiled mysteriously, "Hehe, Brother Dian, have you forgotten how I slipped out with Sister Siyu and the others before?"

......

The night is deep, and the moon is like a hook and claw, hooking away the crimson sky and the dark yellow ground, leaving a faint moonlight, drawing a hazy figure in the dim sky.

The mountains and forests are like ink, the clear springs are dim, the breeze and the night dance on the earth, taking away the dust, taking away the warmth, and taking away the light that belongs to the day.

Inside the walls, although you can't feel the night, you can still feel the silence of the night. Whether it is the third floor or the second floor, all the rooms are closed, only a few people patrol the corridors, their steps are very light, their expressions are very lazy, they are affected by the night, somewhat sleepy.

In this lazy moment, no one noticed that Xin'er and Ma Dian's room had been quietly opened and closed not long ago, and in the staircase not far from the two's room, a slight footstep echoed in the corridor, and it didn't take long to disappear, replaced by the sound of birds flapping their wings.

......

Under the wall, there were two men in black, one male and one female, one tall and one short, one plump and one thin, who were clinging to the wall and constantly looking around.

If Xin'er were here now, she would definitely recognize these two people at a glance, it was Yu Ruxue and Shan Maoyan, who had met Xin'er before!

I saw that Shigehiko Yama on the side couldn't help but take off the mask on his face, took out a bun from his arms, and put it in his mouth.

Seeing this, Yu Ruxue on the side patted Shan Maoyan's hand fiercely and said, "Be careful! What if someone finds out!"

Yama Shigehiko was in pain, hurriedly swallowed the bun, and quickly covered his mask.

"I said Sister Yu, is that Wumin really coming back?" said Yama Shigerohiko as he rubbed his hand that had been slapped.

", I've messaged her, she's definitely coming. Yu Ruxue said while observing the surroundings.

"What message did you send her?" asked Yama Shigehiko.

"It's the same as what I sent you, assemble on the battlefield under the wall!"

Shan Maoyan was speechless for a while after hearing this, "I said Sister Yu, have you not been on a mission with outsiders for too long, you are stupid, the battlefield area under this wall is so big, you don't even give people a coordinate, how do you want people to find you." ”

When Yu Ruxue heard this, she patted her head and said, "It's bad, I forgot that she doesn't know how to position, I have to send her the location quickly!"

Yu Ruxue was about to send Xin'er her location when she heard a familiar voice behind her.

"No, I'm here. ”

Yu Ruxue and Shan Maoyan subconsciously turned around, only to see that Xin'er and Ma Dian had already appeared behind them.

"When did you get here? I didn't even notice you. Yu Ruxue exclaimed.

Xin'er didn't plan to tell Yu Ruxue about the treasure she was carrying, as early as after discovering Yu Ruxue, Xin'er took the handkerchief back.

Xin'er spread her hands helplessly and said, "Maybe our sense of existence is too low." ”

Seeing that Xin'er didn't want to say more, Yu Ruxue didn't ask more, but looked at Ma Dian and smiled charmingly: "Yo~ The little virgin is also here? ”

"Get out, who wants to protect you, I warn you, don't be fussy with Xin'er again, otherwise I want you to look good!" Ma Dian shouted at Yu Ruxue.

When Yu Ruxue heard this, she couldn't help but raise the corners of her mouth, licked her lips and said, "Hehe, no, Xin'er, is it okay?"

"Get out!" Ma Dian turned his head in an instant, blushing.

Seeing this, Shan Maoyan on the side couldn't help coughing twice, "Ahem, I said Sister Yu, it's time to talk about business." ”

Yu Ruxue put away her smile at this time, nodded and said, "Okay, okay, I know." ”

"You two, I don't need to introduce this guy. Yu Ruxue pointed to Shan Shigehiko.

Xin'er and Ma Dian smiled slightly, as early as the moment Shan Maoyan spoke, the two recognized him, and arched their hands at him and said, "Brother Shan Mao, please advise!"

Shan Shigehiko also arched his hand at the two and said, "Please advise." ”

"Okay, let's get down to business, Sister Yu, why did you call me out so late?" Xin'er asked.

Yu Ruxue looked around, bent down, motioned for Xin'er and Ma Dian to lean over, and the four of them formed a circle, Yu Ruxue said, "Xin'er, didn't you tell me to go to other areas before?"

"Well, could it be that you've already been there?" Xin'er said in surprise.

Yu Ruxue nodded and said, "Well, not long ago, I just went to look around the nearby No. 6 area with Xiaoshan and found ......"

When Xin'er heard this, she couldn't help but interrupt Yu Ruxue and said, "Wait, wait, how did you get to Area Six, and how did you escape from the underground prison?" ”

Yu Ruxue smiled slightly, "Because, the cage on the basement floor of the Cumming Wall was set up by me." ”

"What? You've also been involved in setting up the underground prison below?!" Xin'er exclaimed.

"What's so strange about this, after all, the main people here are some frontier soldiers who may defect and some Jianghu elements, in order to ensure the solidity of the prison, the emperor specially invited the ten generals at that time to set up an underground prison, I am one of them, when people know the setting of this prison, but also know the organs, as long as I trigger the mechanism, let the two guards who guard me fall asleep, it is not easy to come up with it. Yu Ruxue said with a flat face.

"By the way, Xiaoshan is the chief designer of 80% of the prisons in our empire, and the prisons here are also designed by him as the chief designer. Yu Ruxue added.

Xin'er looked at Yu Ruxue and Shan Maoyan, and was already very surprised in her heart: I really didn't expect that these two people still have this identity, and such an excellent two people were actually sent to be spies, it seems that Zhu Wenxuan really attaches great importance to Ye Chang!

"Huh...... You two...... It's really powerful. Xin'er sighed.

Yu Ruxue shook her head lightly, "Okay, let's get down to business, after Xiaoshan and I checked the battle site in Area 6, we found that the land in the area where the corpses were buried was a little strange, and the soil there was not loose, but very compact. ”

"Out of curiosity, I dug it up and took a look, and when I took it, I found that all the corpses that had been buried had turned into bones! And there were maggots growing between the bones!

Xin'er nodded, "Yes, black maggots are a unique product of the Lewd Yan Sect, so, I guess that this beast tide is very likely to be done by the disciples of the Lewd Yan Sect, and those two disciples of the Lewd Yan Sect are currently hiding in a corner of the forest, observing every move of the wall!"

Saying this, Xin'er subconsciously looked at the dark forest, only to feel that in the swaying leaves, there was a pair of eyes, staring at herself.

Subconsciously trembling twice, Xin'er hurriedly turned her head, and heard Yu Ruxue ask, "Wait, how do you know that there are two people from the Lewd Yan Sect hiding in the forest." ”

"Because I've seen them before!" Xin'er said in a deep voice.

"What? You've seen it!" Yu Ruxue exclaimed.