Yu Qing explained a wave to everyone, and seeing that everyone around him didn't mean to speak, he probably understood, so he waved his hand at Erica and left the square.

Time is pressing, I still have important things to do, and I don't have the time to waste all my time here.

Erica's small mouth opened wide, her expression was sluggish, and she looked at Yu Qing's back stupidly, and after Yu Qing left more than ten meters, she reacted, and hurriedly trotted behind Yu Qing, and asked in disbelief: "How did you know about those things just now?"

Yu Qing wondered: "Aren't these all basic theories?"

Erica: "......" is based on your size.

When Yu Qing left the square, everyone in the square came back to their senses from the shock: "Who is this, is it the alchemy master of Evergreen University?"

"Wait a minute. Can anyone tell me what exactly a mixed stream is?"

"It's not going to be a technology that this man created himself. ”

"No, I've heard the name Mixed Stream, but hasn't this method been phased out a long time ago, how can it still be used?"

Zhou Anhai also smiled helplessly: "Yu Qing, this guy...... He won't really become a master of alchemy, but even if he is not a master of alchemy, the amount of knowledge in this knowledge base is already very amazing. ”

......

"Erica, can you help me buy a few Dan furnaces, the one with the highest quality. Walking on the road with Erica, Yu Qing asked in a low voice.

Although the Thunder Martial Arts Hall also has Dan furnaces for sale. But the quality is not as good as that of Eldis University, since it is necessary to refine the elixir, it is natural that it cannot save money on the Dan furnace.

"Do you want to refine the elixir?" I don't know why, Erica's attitude towards Yu Qing is a little different, not as big as before.

"Well, a couple of good ideas. Yu Qing said.

Erica then asked, "What type of elixir do you want to refine?"

"It's not...... I didn't mean to probe your elixir ideas, it's just that if you want to refine the Fa Dan, it's best to go to the school's professional alchemy room to do so. Erica whispered.

"Why?" asked Yu Qing.

Erica glared at her eyes and replied, "Because the process of refining the Fadan is very dangerous. It's easy to explode, and while building an alchemy room in your attic will keep the information from leaking, there's no guarantee of security. ”

Yu Qing nodded, it seemed that this was indeed the truth.

"You can help me buy three Dan furnaces first, I need to study it first, and when will I really go to refine the Fa Dan, and then go to your school's alchemy room." ”

"Okay. ”

Erica used her points to help Yu Qing exchange for the three highest quality alchemy furnaces of Eldis University, and Yu Qing used federal coins as payment to return the money to Erica.

After getting the alchemy furnace, Yu Qing said goodbye to Erica and returned to the attic, transforming one of the rooms in the attic into a small alchemy room. When he was at Evergreen University, he carried out this kind of transformation in his own home, so it went well.

And then.

Yu Qing began the retreat.

First of all, it is determined that the prescription of Fa Dan, the corrosive nature of the Netherworld Qi is too strong, once it comes into contact with the elixir, it will destroy the elixir instantly, and it is necessary to find a way to suppress its effect.

Therefore, it is also necessary to choose a main medicine to suppress the death qi of the Netherworld.

"Ssangyong Ganoderma lucidum is not good. ”

"Nine days of ginseng is not good. ”

"Neither can pine and green leaves. ”

"To the car tree...... No, it doesn't. ”

“......”

Watching the elixirs being destroyed by the Netherworld Qi, Yu Qing felt a little painful, these are all elixirs, each one is worth dozens of federal coins, even if he is ...... No matter how rich Lin Yicheng is, he can't afford to be so ruined.

"Finally found it. ”

Yu Qing looked at the changes in the elixir that was taking place on the experimental table, and his heart was happy.

"The Ice Spirit Crystal can actually absorb Netherworld Qi. ”

Yu Qing thought about finding an elixir to neutralize the effect of the Netherworld Qi, but he didn't expect that the Ice Spirit Crystal would actually absorb the Netherworld Qi.

On the test bench, there was a blue crystal the size of a baby's fist, which seemed to be extremely cold, and the temperature of the surrounding air decreased, and fog appeared around the crystal. And in this ice spirit crystal, a black netherworld aura flowed slowly, and the two fused very harmoniously.

After determining the two main medicines for refining Fadan. Yu Qing began to conceive of Fadan's Danfang.

Before I knew it, three days passed.

Yu Qing stretched his waist at this time, pondering: "Fa Dan's thinking is very clear, if you want to give full play to the ability of the Netherworld Evil Qi, in fact, you don't need too many medicinal reactions, as long as you use a few potions to urge the Netherworld Evil Qi to the extreme in an instant, there will be no problem." ”

"There are currently three ways of thinking about Fadan, but this time the elixir, how to determine the prescription?"

"After the experiments of the past few days, Wudao tea is indeed the best medicinal fusion agent, but the main drug must be replaced, otherwise the efficacy of the Huiling Pill will be reduced. ”

After another three days, Yu Qing preliminarily determined the prescription for the Hui Ling Elixir before he used the communicator to contact Erica: "Erica, I want to borrow an alchemist from Eldis University, can you help me?"

"Okay . . . Let's meet in the square halfway up the mountain. Erica replied cheerfully.

After putting away all the things in his private small alchemy room, and asking Caesar to take care of the house honestly, Yu Qing left the attic and walked towards the place agreed with Erica.

Ten minutes later, the two met, and Erica asked, "Yu Qing, what elixir do you want to refine, is it Fadan?"

Yu Qing nodded: "Yes, it's Fadan." ”

"Then you'll have to use the highest-level defense alchemy room, I'll use my account to apply for you. Erica said.

Yu Qing smiled and thanked: "Erica, thank you so much." ”

Erica applied for an alchemist with the highest level of defense through the school's website, and then walked towards the Alchemy Pavilion with Yu Qing.

"Because refining the Fa Dan is very dangerous, the high-level alchemy room is not in the Alchemy Pavilion, but on the North Mountain, and each alchemy room is independent, so no matter how loud the sound is, it will not affect the refining work of others. ”

"And this alchemy room is absolutely safe. It can defend against the normal attacks of the God of War Realm without worrying about danger. ”

Erica said to Yu Qing.

Yu Qing was a little puzzled: "If Fadan explodes in the alchemy room, then the alchemist will be very dangerous." ”

Erica shook her head, very confident, and said, "If you find that the situation is not good, just put Fadan into the pill recovery equipment in the alchemy room, there will be no danger." ”

Come to the alchemy room.

Erica watched Yu Qing walk in and said in the back, "You refine the pill first, I'll wait for you here." ”

After Yu Qing walked into the alchemy room, Erica got up to the net with nothing to do.

Five minutes later.

The door to the alchemy room opened.

Yu Qing's figure burst out.

Erica beckoned to Yu Qing: "It's been refined so quickly, has it succeeded?"

Yu Qing's face was serum, and he didn't reply, but burst out at the highest speed, rushed to Erica at once, picked her up lazily, and ran immediately.

Erica's white face instantly turned pink: "Yu Qing, it's not good at this time......"

"Bang!"

Behind them, the alchemy chamber of Eldis University's highest defense level suddenly exploded.

The roofs were all toppled by the violent currents.

Erica's face turned pale.