Fantasy: The system takes me to refine the magic formula

Why is the boss of my own family so humble?Aren't these people just a few little monsters!
"You are too polite, Lord Demon Emperor!" Xiao Hei and others still bowed their heads and talked to the Demon Emperor humbly, but the five of them were about to die of nervousness. This is the Demon Emperor. A few monsters are afraid!
"Hehe! Fengling, I owe you a favor this time, and I will give you a surprise in the future!"

"That's it! Then thank you Long Shaoxia hahahaha!"

"Okay! I won't stay any longer, I have to take them away first!" Long Tian said!
"Okay! Master Long, please!"

"daughter!…"

"Mother! You are waiting for me here. The young master and I will go first. I have already returned to the demon world! This time, the realm is too low, so something happened. I am making great progress by practicing with the young master! Next time I come back, I will let you Mother saw a powerful Yun'er!"

Li Yun'er's mother was very reluctant, but she also knew that what her daughter said was right, so she could only nod her head!
"Yun'er, if your mother doesn't mind, I can go with you and practice in my space!"

"Master! Is it really possible?"

"Yes!" Long Tian was very tolerant!

"Mother, you?"

"Young master! Thank you for saving my daughter and giving her a chance! I won't bother you anymore. I'm used to it here. I just hope that if my daughter does something wrong in the future or contradicts you , please forgive him!"

"Yun'er is my monster, I won't mind! Don't worry!"

"Hehe! Master Long! Don't worry! The future patriarch of this place will be this lady!" Eight-faced Crane hurriedly stepped forward and pointed at Li Yun'er's mother. Li Yun'er's mother instantly erupted with a powerful demonic aura, and then broke through from the sky demon to the top demon king level!

"I can't continue to push the seedlings to grow! If you break through to the Demon Emperor, you still have to rely on yourself! In the future, the patriarch of the Nine-Tailed Fox Clan will be her, you all have to listen to her obediently, otherwise don't blame me for silence!!!" The emperor's words are very shocking, not only increasing Li Yun'er's mother's strength, but also establishing a background for her!

"It's Lord Demon Emperor! Meet the patriarch!"

"Thank you, my lord!" Li Yun'er's mother was a little unimaginable. She was still a master before, but now she has become a top demon king in an instant, and even turned into a master!
"Master! Let's go!" Li Yun'er said!

"Okay!" Long Tian received the five monsters into the system planting space, then bid farewell to Li Yun'er's mother and the Eight-faced Crane, and flew away with the Monster Emperor!
"Fengling Demon Emperor! Thanks to you this time! I, Longtian, can't repay you!" The two were flying, and Longtian expressed his gratitude to Fengling, when suddenly the system spoke again!
"Host! Here comes the way you reported! There are 2 demon emperor inheritances 3 kilometers below!"

"System! Scanning all the time?"

"Yeah! I have nothing to do. Scanning is easy for me, and I am also scanning to see if there is anything important! Isn't it scanned!"

"Hehe! I'll go and communicate with Fengling first!"

Feng Ling looked at Long Tian who suddenly stopped and seemed to be looking for something, and said, "Master Long! You?"

"Hahahahaha! Wind Chime Demon Emperor! I have made a huge discovery, follow me!"

"A huge discovery?" Feng Ling didn't know what Long Tian meant, but turned around and followed Long Tian's pace!
According to the system's instructions, Long Tian flew to the entrance of a cave below. Standing outside the entrance, Long Tian felt something strange!

"Master Long! You?"

"The Wind Chime Demon Emperor! Do you feel any difference in this cave?"

"It seems that there are some secrets. The energy of the monster energy is different. Maybe someone used to practice here!"

"No! Here are the inheritances of the three demon emperors! Look at me! Breaking Heaven Fist!!!" With a random blow, Long Tian opened the barrier on the side of the cave, and an extremely powerful sealing barrier appeared inside. The establishment is very particular, the outside is hidden, and the inside is reinforced!

"This!!!!!! This is!!!!" Feng Ling was so shocked that she couldn't speak!
"This is the mixed enchantment of the three demon emperors, and the three rings inside are the inheritance of the demon emperor, the demon emperor Fengling, this time in your demon world, there will be many demon emperors appearing!"

"A lot of demon emperors? Could it be you, Master Long!!!!!!"

"Hehe, don't worry! I reported these three inheritances to you. You break the seal, and then find someone with high talent to accept the inheritance immediately! Don't worry, even if you accept the inheritance of the Demon Emperor, you are still a junior, right? Your opponent!"

"Okay!" Feng Ling excitedly broke the demon emperor's inheritance, and the third sister was simple, but the ring with extremely powerful demon power appeared in front of the two of them!

"This is Tianfeng! Earthfire! The inheritance of the three great demon emperors of Zhan Lei! My God! This is the inheritance of the three top emperors from millions of years ago! God bless me, the demon world finally has new hope!"

"Hehe! Alright! Go get busy! I'm going back to the Immortal Realm too! Demon Emperor Fengling, you have to hurry up. Although the Demon Realm is targeting the Underworld this time, you are not far from the Demon Realm!"