Fantasy: The system takes me to refine the magic formula

Yuhu star in the demon world, Li Yun'er, after ascension, because she is a monster in the real demon realm, so after half a year to completely transform the demon energy, she returned to her original realm!
Xiao Hei, Silver Moon Sirius, Violent Behemoth, Golden Eagle Mipeng and other four monsters followed Li Yun'er back to Yuhu Star where Li Yun'er used to be!
But what Li Yun'er didn't expect was that the Yuhu star ten thousand years later was no longer as beautiful as she knew and imagined. On the first day back to Yuxing, Li Yun'er arranged for Xiao Hei and others, so that They waited for themselves, but they wanted to go back to the base camp of the blue-eyed nine-tailed fox first!

"Li Yun'er, do you really not need us to accompany you?" Xiao Hei asked in human form!
"No need for now, I'll go back and check the situation first! The monster energy on Yuhu Star is not bad, you should practice hard, don't embarrass the young master, the young master said that one day he will come to pick us up !"

"Okay, then we'll wait for you here!" The relationship between Xiao Hei and Li Yun'er is very special, and the two of them are not sure whether it is family friendship or something else!
After Li Yun'er left, Xiao Hei worriedly looked at the place where Li Yun'er disappeared, feeling uneasy in his heart!
Li Yun'er is a descendant of a branch of the Nine-Tailed Fox Clan in Yuhu Star. The purpose of going back this time is just to see her mother. Unexpectedly, just after returning to the Nine-Tailed Fox Clan, she was killed by a demon king-level Nine-Tailed Fox Clan. The head of the Weihu family found out, and directly detained him!

"Hehe, you little doll has returned after disappearing for thousands of years!"

"Patriarch! I am Li Yun'er! Why did you arrest me!! Where is my mother?"

"Your mother won't know about your return!" Nine-Tailed Fox Patriarch Hu Zhan said!

"Patriarch! What do you mean!!" Li Yun'er didn't understand the patriarch's thoughts!

"Hehe! Xiong Da, the patriarch of the Xiong Clan, said that in four months, if our Nine-Tailed Fox daughter marries him, hehe, then you can get a million years of worry-free life. You know what I mean! And his request is , the age cannot exceed [-] years old, and at least be a master above the level of a true demon! Tsk tsk, there is no one else in our Nine-Tailed Fox tribe except my daughter Huma, hahahaha I didn't expect you to be here at this time I’m back! God help me! You are the most suitable candidate! Li Yun’er, you should have been punished for leaving without permission, but I want you to marry the bear clan for the stable development of our Nine-Tailed Fox Tribe. , I will forgive you this time! Someone, imprison her in the fox cage!"

"You dare! You can't do this to me! I want to see my mother!!" Li Yun'er looked at the four or five demons surrounding her and knew that she was doomed, but thinking that Xiao Hei and the others were still waiting for her, Long Did Tian also promise to come to them, so Li Yun'er still put in a fight!
It's just that the real demon is still a real demon, Li Yun'er is not Long Tian, ​​and he can't break through the realm leap, so he lost instantly and was caught by someone, and locked in the fox where the nine-tailed fox trapped the prisoner!
A few days passed, Xiao Hei and others did not wait for Li Yun'er's return, they searched for his trace everywhere, and this is the demon world, Xiao Hei and others are not at the level of real demons, they are the lowest level at all, and they are also expensive. It took several days to find out where the gate of Nine-Tailed Fox's tribe opened!

"Golden Eagle, I will sneak into the Nine-Tailed Fox's tribe tonight and find out Li Yun'er's location!"

"Xiao Hei, don't be reckless, you have to know that in the demon world here, any master above the level of a real demon will kill us! Did you forget the young master's order?" Jin Diao dissuaded!

"No, I can't wait any longer! I already feel that something is going to happen to Li Yun'er!"

"Then you can't act rashly. If you put yourself in it, then we will only be in a hurry. At that time, we will not only need to find news about Li Yun'er, but also find a way to save you!"

Xiao Hei was silent, he knew that what the Golden Eagle said was true, but he just had a very bad premonition!
"Then what do you say!"

"Continue to inquire! We have all found the territory of the Nine-Tailed Fox. I think someone must know about Li Yuner's return to the Fox Clan, or Li Yuner also has someone to meet when he returns to the Fox Clan. We can find a way to find it first." Li Yuner's family is making a decision!"

"Hey!"

That night, Xiao Hei still couldn't hold back his heart, quietly left Jin Diao and others, and went to the gate of the Nine-Tailed Fox Tribe alone. Get up and follow behind Xiao Hei!
After all, they ascended together, and they have been with Long Tian for so long, they can't let Xiao Hei take risks by himself!
The Nine-Tailed Fox tribe is located on a mountain full of evil spirits. Xiao Hei quietly came to the side of the gate and observed for a long time, but he did not rush in. He was waiting for an opportunity. Sneak in behind them! !

Sure enough, in the middle of the night, a team of holy beast-level guards patrolled around the gate of the Fox Clan, and then entered the tribe of the Fox Clan through the side door. Xiao Hei quickly followed, and Kuang Diao and others also secretly followed Behind Xiao Hei!