As a very rare refining material in the immortal cultivation world today, heption silver is specially used to increase the hardness and sharpness of the refined artifacts. That is to say, a magic weapon or magic weapon can add a little heptane silver, its hardness, sharpness, and then when it is against the blade of the same level, it can be sharper, harder, and easier to defeat the opponent's blade.

This kind of refining material called "Gengyin", Sun Fengzhao is no stranger, when Lu Wantian taught him the theoretical foundation, he mentioned that there is such a genius treasure in the immortal cultivation world, but the current reserves are very scarce, and it is rare to see.

Why can it be called a "genius treasure", because this is simply the famous "treasure of refining weapons" in the immortal cultivation world, which is rarely seen, and as long as such a small bit of heptosilver material is mixed into sword magic weapons and magic weapons, and then cultivated a little, then this magic weapon or magic weapon will be doubled in power. It is definitely a monk who uses magic weapons and magic weapons such as flying knives and swords, and regards it as if it were his life.

Sun Fengzhao once obtained several pieces of refining materials from Ji Congliang, and in terms of value, the value of Gengyin is far above these materials, and it cannot be said to be the same.

But I've never heard of using a whole piece of Gengyin to make a blade, and in today's immortal cultivation world, how many spirit stones is this sword worth?

"Ancient monks are really extravagant!" Sun Feng sneered, and began to figure out the refining method of this dragon-shaped magic sword again.

This dragon-shaped magic sword seems to be made with a grinding tool, and then directly poured into it with melted heptogin, and after cooling, it is made into such a complete "magic sword".

What level this dragon-shaped magic sword has reached now, with Sun Fengzhao's current cultivation, it is no longer possible to determine. Sun Fengzhao only knew that this dragon-shaped magic sword looked very imposing, and at the same time, it also had a guarantee of solidity and sharpness.

The magic sword that Sun Fengzhao imagined seemed simple, but in Sun Fengzhao's mind, it was absolutely impossible to imitate it now!

To create this kind of dragon-like Gengyin magic sword, the monks of today would never directly use the molten Gengyin to grind it so luxuriously!

Don't say that there is not so much Geng silver in the immortal cultivation world now, and even if there is, no monk is willing to waste such a good refining material.

However, another problem immediately bothered Sun Fengzhao, looking at the ancient monks' refining methods, most of them were so rough carved and refined with whole pieces and whole superb materials. Although Sun Fengzhao has not yet figured out that the ancient battlefield he is in now and the underground Ancient Monk Immortal Cave Mansion are from that era, judging from this labor-saving process, this may be an ancient period that lacks rich refining methods.

So how did they use this seemingly simple superb refining material to eliminate the impurities in it? If they just poured and polished it directly, they might be able to make a magic weapon, but the materials in it would inevitably be mixed!

What's more, on the surface of the dragon-shaped magic sword, there is no polished appearance. In other words, it is definitely not tempered by the refiners with advanced craftsmanship.

If you can't think of it, you don't want to!

The more Sun Fengzhao went deep into the core area of this ancient battlefield, the richer his vision, the increase in experience, and the more he gained, the more questions he accumulated.

"Don't worry about a lot of debts!", the more Sun Fengzhao asked, the more unwilling he became to think about it. Anyway, these questions have little to do with Sun Fengzhao.

Without thinking too much about the many questions left by the ancient monks, Sun Fengzhao immediately put his mind on the newly acquired dragon-shaped magic sword.

"I'm not sure what level this dragon form belongs to right now, but I can always try its power, right?"

Not daring to blindly inject mana like opening the ebony red box just now, Sun Fengzhao took the dragon-shaped magic sword, and without injecting mana, he slashed at a corner of the stone platform.

Sun Fengzhao didn't hear any sound, but he felt that the dragon-shaped magic sword that waved in his hand didn't meet any resistance, as if a sharp blade cut close to a piece of tofu, and the stone at the corner of the platform quietly broke away from the stone platform and fell into the underground swamp.

"Wow, the magic sword made of Gengyin without injecting mana is so sharp, and injecting mana can probably cut through this cave directly, hehe...... Found a treasure...... Let's take a look at another ......"

But when Sun Fengzhao was in a hurry to lean out to retrieve another ancient treasure in the storage box, he caught a glimpse of the edge of the platform that had been cut off by the Gengyin Dragon Sword.

"It's wrapped in a separator?"

Sun Fengzhao, who was constantly shocked, was once again shocked by the luxury of the ancient monks. It turned out that these stones that Sun Fengzhao had never carefully inspected along the way were all mixed with the isolation stones that Sun Fengzhao had seen at the peak of Song Gaozong's medicine in the interior of the boulder.

I don't know if the refining process of the ancient monks is not in place, so they can only mix the precious isolation stone into these ordinary stones and use them to build this underground facility.

The most well-known characteristic of the Isolation Stone is that it blocks the penetration of divine consciousness and mana, and of course it can also insulate heat. But this place is not an earth-fire alchemy room like the peak of medicine.

So what did these ancient monks who didn't know the age want to hide or hide, they actually used such a large number of partition stones as ordinary stones to build this underground world. This is probably the reason why they went to war, so who are the "they" mentioned in the last words of the ancient monk surnamed Long? Shouldn't immortal cultivators be the top existence in this realm in the present or in ancient times? So who is the ancient monk fighting against?

I couldn't understand that he couldn't take away these raw materials mixed with stone separation, so Sun Fengzhao once again turned his attention to another ancient treasure in the storage box. Taking out this ancient treasure, Sun Fengzhao didn't look at this ancient treasure so much at first glance. Because this ancient treasure turned out to be a gold brick.

"This ancient monk is really interesting, then this kind of mortal treasure is collected as an ancient treasure!"

As he spoke, he picked up this golden eye-catching gold brick, and after getting it, Sun Fengzhao knew that it was not an ordinary gold brick.

The strong sense of spiritual power fluctuations and the heaviness of the hand all indicate that this gold brick is also refined with high-grade immortal cultivation materials. Similarly, there is not even a single crack on the four sides, only the two ends of the rectangular gold bricks are engraved with two runes that Sun Fengzhao could not read.

It's just that Sun Feng can't see that this is that kind of material, and that's because of his shallow experience in cultivating immortals. I don't know the two runes, and Sun Fengzhao is not in a hurry to figure out the material and meaning of the runes of this gold brick. At this time, what he was eager to try in his heart was the power of this gold brick, which was the main topic Sun Fengzhao was thinking.

This time, it is impossible to smash the stone platform in the body, so throw it and look at the bulging black soil mounds underneath to see if it can smash out a huge pit that Sun Fengzhao has seen on the ancient battlefield above.

"Whew!"

The gold bricks infused with a little mana were directly thrown down by Sun Fengzhao, and because of the guidance of mana, the gold bricks accurately shot at a pile of black soil that rose on both sides of those swamps.

"Poof!"

Sun Fengzhao, who shrank into his head and body, even released an orange shield in anticipation of the earth-shattering storm of gold bricks.

But judging from the fluctuations in sound and spiritual power, it seems that there is not much movement below.

"Huh?"

Quickly float up and see the effect of the brick smash from above.

But before Sun Fengzhao flew to the best angle to watch the situation in the swamp below, but in fact, only when Sun Fengzhao flew away from the stone platform and swept his eyes down, he held his breath and stared at the scene in front of him.

Sun Fengzhao even pinched himself hard, making sure that he was not dreaming, and only then did he be convinced of the facts he saw.

The gold bricks actually smashed a huge hole underneath, yes, a cave indeed. The pile of disappearing black soil proves what Sun Feng saw.

Sun Fengzhao flew down the swamp again under the protection of the shield and the green tea magic weapon flying around his side, standing on the edge of the cave, and casually glanced at the white stone pavilion just now, but unexpectedly found that the gold brick that Sun Fengzhao thought had fallen into the cave just floated back into the white stone pavilion, looking like he was moving east and west, and he couldn't find a place to stay.

Sun Fengzhao was surprised for a while, and then took out the ebony storage box again, sent it to the white stone pavilion with mana, and grunted, the gold brick was like finding his mother's arms, and after the ebony storage box automatically opened the lid, it flew in.

After Sun Fengzhao recalled the storage box again, after opening it, as soon as his divine sense poked into the box, he saw that the Gengyin Dragon-shaped magic sword and the gold bricks were lying quietly in the wooden box, as if it was born there as if it was their place of refuge. This made Sun Fengzhao blink his eyes, not understanding what was going on.

With new doubts, he returned to the edge of the cave again, and when he looked down, he was swept across his cheeks by a burst of red light. Frightened, he instinctively stepped back, then released his divine sense to go deep into the cave again, checking the situation of being smashed out of the cave by the gold bricks.

I immediately understood the power of the gold brick that I had misunderstood, this seemed to be an artificially dug cave, not smashed by gold bricks, but just happened to open an entrance.

The roof of this cave is in the shape of a garden arch, and it is at least dozens of zhang away from the ground where Sun Fengzhao is standing, and the fluctuation of spiritual power proves that this is another part of the underground world built by an ancient monk.

And the area of this cave is too large to be estimated, at least Sun Fengzhao's current divine sense, once he probed the past, at least more than a mile long, and he hadn't even touched the end......

Although Sun Fengzhao's divine sense was powerful, it was so profound that he couldn't detect it. Standing on the top of this cave, Sun Fengzhao not only felt the powerful spiritual power fluctuations, but also saw the flowing red light prohibition more truly. Here, this kind of red light is forbidden, flowing regularly in the cave layer by layer, and it actually forms a shield-like magic circle.

When Sun Fengzhao saw this, he couldn't help but be stunned, then retracted his sense, took out the ebony storage box again, took out the gold brick, and muttered to himself: "Could it be that this gold brick magic weapon is actually a key to open the ancient monk's deeper underground ancient immortal cave mansion?"