This was a place similar to the flea market. Normally, there would be people setting up stalls here to trade all sorts of things. However, most of the time, there were very few people here.

At the entrance, there were two rows of armored soldiers guarding it as well. They were responsible for collecting spirit stones to pay for entering the Pill Exchange. Therefore, every year in Pinglan City, the Pill Exchange would also be an opportunity for the Pinglan King to ama.s.s wealth. He would receive hundreds of thousands of spirit stones.

"Two people."

After Ye Zilong brought Lin Feng to this place, he immediately paid his twenty spirit stones:

"Let's go in and take a look."

After entering, Lin Feng's gaze started to size them up. The whole Pill Exchange was like a village market on earth. There were dozens of places the size of football fields divided into different areas.

It was just that almost all of them were trash.

After looking around, Lin Feng sighed helplessly.

At first, he had hoped to obtain some good immortal medicine or some rare treasures that could be used to refine the sword. However, after looking at them, he became incomparably disappointed.

Although the place that he had turned into was only a small one, just by looking at this one area, it was enough for Lin Feng to make a judgement on the situation in the Pill Exchange.

"It's a treasure that has just been made. This is a treasure that I took my life out of the Qilin Valley to obtain."

The disappointed Lin Feng was quickly pulled to full attention by a shout.

Following the source of the voice, they saw a young man with a sharp mouth and monkey cheeks squatting about ten meters in front of them. In front of him was an object that glowed with lightning.

As the streaks of lightning flickered, sizzling sounds would also be emitted from the stone the size of a claypot. It was as if the stone was being pierced by electric currents.

"Brother Lin, you can't have set your eyes on that thing, right?"

"This is w.a.n.g Pao Monkey, a disciple of the Golden Winged Sect. Every year during the Pill Exchange, he would come up with some strange things to trick some rogue cultivators who don't have much power."

"That thing is merely an ordinary lightning stone. There are a lot of them in the Thunder Valley. There is as much as you want."

There were a lot of people who didn't know about thunderstones, especially in places like Ping Lan. From the looks of it, lightning was flickering around his body and seemed to contain a strong power of lightning that could temper his body. However, in reality, these were merely appearances.

The purple light that was flickering on it wasn't some lightning bolt, but something unique about this stone.

As if he had never heard of it before, Lin Feng slowly narrowed her eyes. She stared at this piece of rock that was completely covered with lightning bolts, and started to carefully size it up.

However, as soon as his voice sounded, a young man of similar age walked over and jokingly scolded:

"w.a.n.g Pao Monkey, you're f * cking using this again? What high grade thunder crystal? This is just an ordinary thunder stone from the start, there are trash everywhere in the lightning valley. Hurry up and put away this s.h.i.+tty thing, don't continue to trick people here. "

"What do you know? These are high-grade thunder crystals." w.a.n.g Pao Monkey scolded with dissatisfaction. His face was filled with the embarra.s.sment and anger of having his lies exposed.

"Is that so? Do you want me to go to the Thunder Valley and bring out a bunch for sale here? "

"Scram! Quickly scram! Stop delaying my business!"

"Ha ha!" The young man didn't continue to pester him but left while laughing out loud.

Lin Feng's gaze landed on this piece of stone that was flickering with lightning radiance, and quickly fell into a daze.

It was rare for him, who had always been calm, to become so agitated.

"Sky Profound Thunder Crystal!"

"I never thought that I would actually meet something like a Sky Profound Thunder Crystal in this kind of place!"

Sky Profound Thunder Crystal was a special kind of energy crystal. The lightning energy it contained was extremely terrifying. If an explosion were to occur, the power of thunder and lightning to be released would be comparable to the power of over a thousand lightning bolts to explode at the same time.

Not only could it be used to temper one's fleshly body, it was also used to refine magical equipment.

Just this one piece was enough to refine a Chaotic Element Flying Sword to the limit. Most importantly, it can also bestow a special attribute to a Chaotic Element Flying Sword's lightning attribute.

"Holy s.h.i.+t, you really have your eyes on those thunderstones!"

Seeing that, Ye Zilong quickened his pace and followed.

"Little brother, you have good eyes." Seeing someone coming over, w.a.n.g Pao Monkey laughed excitedly: "I don't need over ten thousand Grade One Spirit Stone s or even over a thousand grade two spirit stones for this piece of Superior Grade Thunder Crystal."

"A thousand. As long as it's a thousand Grade One Spirit Stone, take it away."

"Courting death?" w.a.n.g Pao's face turned cold as he angrily said, "The one in the lightning valley is a thunderstone, I am a high-grade Thunder Crystal!"

After angrily berating Ye Zilong, w.a.n.g Pao Monkey hurriedly turned his gaze towards Lin Feng: "Little brother, don't listen to that brat's nonsense. The thunder stone is only a slightly special stone, while the thunder crystal is a special energy crystal."

"The value of a single high-grade Thunder Crystal would require at least ten thousand Grade One Spirit Stone. This means that I am in a tight spot right now and am in a hurry to sell it for some Spirit Stones in exchange for some Spirit Stones to save me. Otherwise, don't even think about the price of a thousand Grade One Spirit Stone. "

"Continuing to hoodwink!" Ye Zilong scolded angrily, his face was filled with urgency as he continued: "Brother Lin, do not listen to his nonsense. If it really was a high-grade Thunder Crystal, let alone a thousand Grade One Spirit Stone s, even if it was three thousand, five thousand, I wonder how many people would come to buy it."

Lin Feng smiled slightly.

High-grade Thunder Crystal was nothing compared to the Sky Profound Thunder Crystal.

If the Sky Profound Thunder Crystal's value was said to be tempered steel, then the value of high-grade Thunder Crystals were ores just dug out from the mountains. There was an insurmountable chasm between the two. The difference in value was like heaven and earth.

"How about we exchange it for the Heaven Origin Pill?" Lin Feng asked.