Zhang Bin bargained with the Dragon Vein, and finally reached an agreement.

Twenty thousand top-grade spirit stones in exchange for one person's worth of dragon marrow.

In essence, it means that in the future, when Zhang Bin can refine dragon marrow, he can refine to his heart's content until he can no longer refine it.

If the Taiqing Sect also finds another genius who can refine dragon marrow, they can also refine it. Similarly, it would cost twenty thousand top-grade spirit stones per person.

Both parties were very satisfied with the result.

For Zhang Bin, because he could freely enter and exit the Dragon Blood Forbidden Zone, he could naturally collect countless top-grade spirit stones, so for him, acquiring top-grade spirit stones was no different from acquiring top-grade spirit stones. Hence, he felt he got a great deal.

As for the Dragon Vein, being able to obtain top-grade spirit stones, which only exist in the Immortal Realm, allowing itself to grow rapidly, was worth any cost.

The Dragon Vein quickly devoured all the top-grade spirit stones, embedding them all in its heart.

It then taught Zhang Bin a particularly complex sharp edge array.

However, Zhang Bin soon became furious because the formation was too complicated for him to set up.

In other words, his spiritual power was still too weak.

"You're deceiving me, give me back my top-grade spirit stones." 𝕗𝐫𝐞𝕖𝕨𝐞𝗯𝚗𝕠𝘃𝐞𝚕.𝐜𝗼𝚖

Zhang Bin jumped up and shouted.

"Hehehe… the deal is already done. I've taught you the formation. You can't set it up yourself; can you blame me?" the Dragon Vein said with a sly smile.

"But you didn't mention it before?" Zhang Bin stubbornly said, "I want to set up a very powerful sharp edge array within my body to deal with powerful enemies."

"You don't recognize the value in your hands. This sharp edge array is a second-level formation. On Earth, or any other planet, there are no second-level formations at all. Second-level formations are too precious, far exceeding the value of twenty thousand top-grade spirit stones. The formations you now know are all first-level, and their power is too weak," said the Dragon Vein.

"Second-level formations? Are there third-level formations too?"

Zhang Bin asked in astonishment.

"Third-level formations do exist, and they would be considered Immortal Arrays," the Dragon Vein said, "Actually, second-level formations can also be considered low-level Immortal Arrays. Obtaining an Immortal Array means you've made a huge gain."

"Gain my foot, a formation I can't set up is useless to me," Zhang Bin said frustratedly, "In the future, when I'm in the Immortal Realm, I can naturally learn countless such second-level formations. Knowing now doesn't help me at all. Unless you help me set it up."

"To be honest, second-level formations must be set up on extremely hard materials, which are actually Immortal materials. If you cultivate a Dragon Body, your body would be comparable to Immortal materials. Then setting up a second-level formation would be no problem. But now your body is too fragile, it can't withstand a second-level formation. Even if you set it up, it wouldn't be useful; it would collapse in half an hour," the Dragon Vein said.

"It would collapse in half an hour?"

Instead of being disappointed, Zhang Bin's face was filled with intense joy, his eyes radiating excitement, "In that half an hour, would it have super strong combat power?"

"Before it collapses, it'll be extremely sharp. It can break the defense of a high-grade magical artifact," the Dragon Vein said, "However, at the time of collapse, your hand would explode, possibly killing you in the process. So, it's better not to set it up."

"A mere formation could explode?"

Zhang Bin was astonished, almost suspecting the Dragon Vein was talking nonsense.

"The terror of a second-level formation is not something you can fathom," the Dragon Vein said, "How about this: provide an exceptionally hard material, and I'll set up a second-level sharpness formation on it, making a great weapon? But this weapon will only last a few days."

"That's a good idea," Zhang Bin said happily, and immediately took out many materials and treasures from his Space Ring, piling them on the ground.

"Trash…"

The Dragon Vein said disdainfully, "Only your dragon claw from the Dragon Pool can have a second-level formation set up on it, but it can only last for three days."

"How can you see through my Dragon Pool?"

Zhang Bin's face showed surprise and puzzlement.

"Dragon Pool—Dragon Pool—having a 'Dragon' character in its name, naturally can't hide from my probing. I'm a future True Dragon," the Dragon Vein said proudly, "However, if in the future you become a True Dragon, I won't be able to see inside."

"Uh…" Zhang Bin rubbed his forehead, "The dragon claw is too big and too heavy, I wouldn't be able to lift it after setting up the sharpness formation."

"Haven't you mastered so many formations? Just set up a Weight Reduction Formation, a Shrinking Formation, and a Vajra Formation inside, and you'll be able to use it," the Dragon Vein said.

"Damn… have you been peeking at my Jade Scroll, learning all the formations from it?"

Zhang Bin jumped high in surprise.

"Uh… I indeed didn't know formations before. Just now when you read the Jade Scroll, I read it too. I learned all the formations, and it awakened some inherited memories in me, reminding me of a second-level sharpness formation…," the Dragon Vein said a little embarrassingly.

Zhang Bin was utterly speechless. It turns out that while cultivating here, the Dragon Vein could know almost all of his cultivation secret techniques.

It seemed he suffered a huge loss.

However, he didn't dwell too much on it, having also gained a lot of benefits from the Dragon Vein.

In the future, he might also become a True Dragon and be like family with the Dragon Vein.

He immediately took out the dragon claw and said regretfully, "Such a huge dragon claw is an excellent artifact refining material. Setting up a second-level sharpness formation, and then having it collapse in three days, is a real pity."

"Why feel sorry? The dragon claw is just a slightly better piece of trash,"

the Dragon Vein said indifferently.

"Do you mean to say that this dragon in life reached the Ascension Realm and might have even become a True Dragon Bone, and its claw is trash?"

Zhang Bin asked in astonishment.

"True Dragon Bone? You are too naive," the Dragon Vein said, "Since Earth's formation, countless civilizations have been nurtured, including the Flying Dragon Civilization. But no dragon has ever cultivated into a True Dragon Bone. Otherwise, I would definitely sense it. True Dragon Bone isn't something easily cultivated; it requires endless years and numerous fortuitous encounters. Without my help, there's no hope at all. According to your Jade Scroll's data, at most, this dragon claw can be refined into a high-grade magical artifact. In terms of hardness, it can't compare to Heavenly Treasures. But True Dragon Bone is far harder than Heavenly Treasures, comparable to Immortal materials. So comparing this dragon claw to True Dragon Bone is like comparing mud to steel."

"Uh…"

Zhang Bin rubbed his forehead, feeling a bit of a headache. Now he finally understood how difficult it was to cultivate into a True Dragon Bone.

He also realized that the dragons in the Dragon Blood Forbidden Zone were Tianlongs, not Earth Dragons. Even if they had cultivation techniques to become True Dragons, they couldn't become True Dragons.

Perhaps if they went to the Immortal Realm, they'd have a slight chance.

As for himself, cultivating into a Dragon Bone would also be extremely difficult.

He had the help of the Dragon Vein but lacked the cultivation techniques to become a True Dragon.

Even with a cultivation technique, achieving a True Dragon Bone was extremely difficult.

To temper the bones inside his body to a hardness surpassing Heavenly Treasures, comparable to Immortal materials, would be unimaginably challenging.

The Dragon Vein would need tens of billions of years to cultivate.

Heavenly Treasures would require Heaven and Earth to nurture for hundreds of millions or even billions of years.

He shook his head and stopped thinking about it, saying, "Even so, this dragon claw is the best material I can get. Wastefulness is shameful."

"How is it wasteful? Even if the dragon claw becomes fragments, they're still good materials, and can be melted with flames in the future, naturally being refined into a powerful magical treasure again!" the Dragon Vein said indifferently.

"Makes sense," Zhang Bin laughed joyfully, realizing he'd been smart all his life but confused for a moment.

(Six chapters sent, asking for recommendation votes, thank you.)