Although there is no sunlight coming in the cave leading to the underground palace, it is still very bright, but this light has a very obvious blue color.

If you look closely, you will find that there are many stones emitting blue light on the walls on both sides of the cave. This is a very common thing called blue fluorite on the earth after the New Era. It can shine and is very beautiful. It is usually used as an ornament or light.

"There are so many blue fluorites here, and the demonic energy is really strong." Liu Yun looked at the blue fluorites and said, "Do you know the real function of this stone?"

"The real effect?" Wang Hui really didn't know.

"You have joined Shangqing Sect. Don't just go to the classic library to read it well, and you won't waste too much time." Liu Yun curled her lips and said, "Blue fluorite was originally an ordinary stone, but because it absorbed the ultimate evil demon fire for a long time and was constantly tempered, it became like this. You must know that this stone is more useful to cultivators than water spirit stones or fire spirit stones. Whether using water or fire magic, it can greatly improve its power, and it will also bring the special effects of the ultimate evil demon fire."

"No, then we have so many blue fluorites here, won't we release them?" Wang Hui knew the value of the fire spirit stone. It was a spirit stone containing the fire spirit energy. For cultivators who practice fire cultivation techniques, it was a treasure, much better than ordinary spirit stones.

"No prospect, a little blue fluorite will make you envious of this. These are just low-quality blue fluorites. If you want to really make a fortune, you can only find high-quality blue fluorites in the underground palace." Liu Yun glared at Wang Hui and said.

Wang Hui curled his lips disapprovingly. He is different from Liu Yun. He is just a warrior, but Liu Yun is a cultivator in the Golden Pill stage. The two are far different in terms of knowledge. Liu Yun can give him a treasure weapon at will, but he can't even give him a magic weapon. This is the gap in financial resources.

"By the way, if the Supreme Yin Demon Fire in the Blue Fluorite is extracted and can be used to refine special magic weapons, it is a flame of the same level as Samadhi True Fire, and the magic weapons refined are also extraordinary." Liu Yun continued.

"This thing is so useful. It is really a waste for those mortals and rich people to make jewelry with it." Wang Hui sighed.

"There are many differences between the cultivation world and the mortal world. Since you have become an immortal, you should have a good idea. The same item may be useless to mortals, but it may be a treasure for cultivators. So it is right to read more books to avoid missing a good thing." Liu Yun sighed.

"I understand, senior sister!" This time Wang Hui was sincerely taught. When he first entered Shangqing Sect, he only thought about practicing with all his heart. He turned a blind eye to those books introducing knowledge of the cultivation world. Now it seems that it is really inappropriate.

While thinking, he continued to walk deep into the cave. He did not encounter any danger within the range near the entrance of the cave, so he also had time to think about life.

"Wait a minute! Something is coming!" After walking about two hundred meters, you could vaguely see the entrance of the underground palace. Liu Yun grabbed Wang Hui's clothes and said.

Wang Hui was almost pulled down directly, but his eyes were still looking in the direction Liu Yun was looking. A big guy who almost blocked the entire cave road quickly squirmed over, and his whole body emitted a more dazzling blue light than blue fluorite, which looked very beautiful.

"Blue Firefly Snake!" Liu Yun blurted out, "The strength of the first level ninth level is just a small guy, kill it! Don't waste too much time!"

Wang Hui nodded without saying much, and rushed towards the blue firefly snake with the ghost-headed thunder knife in his hand. When he was about to meet the blue firefly, he suddenly used a flash of lightning to change his position and slashed the blue firefly snake's neck with a knife.

The blue firefly snake is made of blue fluorite, which is very hard. However, the ghost-headed thunder knife in Wang Hui's hand is a treasure weapon. It is naturally very easy to cut down, just like cutting frozen tofu, and it doesn't take much effort.

The blue firefly snake was cut off its neck, but it did not die. Instead, it turned into two smaller blue firefly snakes and attacked them from both sides.

Wang Hui was not panicked at all. The ghost-headed thunder knife was still slashing at one of the blue firefly snakes, but this time it was time to make a special "poisonous dragon drill". The ghost-headed thunder knife made a loud sound, and the blade body continued to rotate, as if it had formed a lightning drill bit, which directly drilled the blue firefly snake from head to tail into powder, and there was no possibility of resurrection again.

Another blue firefly snake did not seem to have escaped because of the death of its companion, and still bit Wang Hui, spitting out blue flames, obviously very angry.

It was only about half a foot away from Wang Hui at this time, and Wang Hui's ghost-headed thunder sword could not be retracted in time because it dealt with another blue firefly snake. It seemed that its attack was about to succeed.

But this blue firefly snake never dreamed that when it was about to bite the man, it actually pinched it with one hand. The extremely terrifying true energy penetrated out of its hands, and instantly it lost any consciousness.

Wang Hui's body is a magic weapon, and it is not a piece of cake to deal with a monster of the first level ninth level. Since the other party was pinched by him, it would be impossible to escape and die.

Looking at everything in front of her, Liu Yun was a little surprised. Although the blue firefly snake was simply not worth mentioning to her, she could kill it even if she breathed a breath, but Wang Hui, a warrior, killed the blue firefly snake so easily, made her feel a little incredible, especially the action of pinching the blue firefly snake to death with her bare hands in the end. Although she was a little awkward, she was very domineering.

"Have you ever eaten something? Why are you so skilled? And the body of a mere warrior can withstand the ultimate demon fire? What's going on?" Liu Yun asked curiously.

Wang Hui had already thought of the words, so he was not panicked and laughed softly and said, "Senior Sister, you know. I have been a mortal for more than ten years. Even I don't know what good things I ate. Perhaps in the eyes of me, an ordinary person, it's just a food that is so ordinary that I can't answer this question."

"Forget it, it doesn't matter what you eat, it's okay for me. Let's continue moving forward. This blue fluorite is garbage, but once you enter the underground palace, you have to be careful. The weakest monster there is also a level ten level, which is equivalent to the tenth level of the Martial God stage among you warriors. Never be confused because of this small victory." Liu Yun was not curious, but she had seen too many strange things, and it was not bad for Wang Hui, so there was no need to break the pot and ask the final question.

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