The blood demon walked to the crowd, and everyone was suddenly silent, this was just a group of disciples in the foundation building period, with Yuan Qian's identity, it naturally made them look respectful, and automatically retreated to the side to make way for a passage, and then listened to the blood demon command in silence.

Lin Feng followed behind the bloody demon, using his mind to control the bloody words and deeds, its indifference was no different from Yuan Qian's, and his demeanor was even more vicious, he went straight through the passage that everyone gave way, and came directly to the boulder.

Lin Feng still followed behind it, his divine sense had already been thrown into the inside of this protruding boulder, and the bloody demon walked to the boulder and stood still, and asked everyone in a cold tone, "What's the matter?"

A monk in the crowd who was in the late stage of foundation building stepped forward and said, "Elder Qiqi Yuan, this fork in the road has just been opened, but after excavating for a few days, I suddenly found this boulder, the texture of the boulder is extremely hard, and the divine sense cannot penetrate it at all, and the disciples are discussing whether to use mana to forcibly take it out, or to go around it and continue excavating." ”

Bloody said: "Hmph, there are precious thunder nitrate sand everywhere here, once it is destroyed by mana, can you afford the loss caused?"

This disciple hurriedly lowered his head and said, "That's why the disciples don't dare to start, but if they go around the boulder and continue to dig in other directions, they are worried that there will be scarce spiritual ore inside or behind the boulder, wouldn't it be a pity to miss it like this?"

Bloody was silent for a moment, and then continued: "This place, I will handle it personally, you all disperse, no one is allowed to enter this fork in the road without my order!"

The disciples of the foundation building period even claimed that they were, and then withdrew from the mine one after another, until they all disappeared into the other mine paths, Lin Feng punched out a dozen array stones at the entrance of this fork and sealed the hole of the fork with a powerful protective array.

Next, Lin Feng personally walked to the boulder, the divine sense perspective had already been opened, this solid boulder was more than ten zhang deep, and the divine sense of ordinary monks could not penetrate it at all, but under the perspective of the divine sense, Lin Feng had a full view of the internal situation!

The whole boulder is composed of extremely dense black rock gold, but the thickness of black rock gold is only less than three feet, and the bottom of three feet is embedded with dense spars like stars in the sky, and each spar is actually made of the polymerization of thunder nitrate sand with extremely high purity!

Lin Feng's emotions stirred up an uproar at this moment, such a huge amount of Thunder Nitrate Flame Sand was enough to turn the entire Bone Demon City into nothing in an instant, if it weren't for the three-foot-thick Black Rock Gold wrapped outside, any slight fluctuation of spiritual power would be enough to detonate this terrifying pile of Thunder Nitrate Flame Sand Crystal Ore!

Thunder Nitrate Flame Sand is extremely rare in the cultivation realm, even if there are ore veins, but it can only appear sporadically in the form of sand grains, like this kind of condensed into crystal ore and gathered into piles, it is simply unheard of, Lin Feng really can't imagine under what conditions it caused such a huge amount of Thunder Nitrate Flame.

Standing in Lin Feng's direction, the whole boulder is like a huge pomegranate, and on the three-foot-thick surface, there is a layer of extremely dense black rock gold, and under the black rock gold wrap, countless crystal clear dark purple ore crystals are deeply embedded in it, like a grain of naturally condensed gems compactly arranged together, these gems are all left-channel materials that make people see the color change: thunder nitrate sand !

Black Rock Gold is also a very rare cultivation material, it has a very good effect in the field of refining, but it is not directly refined into the magic weapon, but a consumable material, its purpose can improve the quality and level of the magic weapon!

In the field of refining, the most important point is the purification and casting of materials, the purity of materials will directly affect the quality and power of magic weapons, and the purification of materials, in addition to relying on the skills of refiners, there is also a special spirit ore in the cultivation world, which can help refiners purify materials more pure!

This special spirit ore is known as the "Extraction and Metallurgy" material in the refining field, it is a rare product that all refiners are treasured, and the black rock gold in front of Lin Feng is one of the extremely high-quality Extraction and Metallurgical Materials!

The black rock gold is melted at high temperatures, and can penetrate into the interior of most refining materials, and the refiner uses his own mana to manipulate the melted black rock gold, and adsorb the impurities inside the material into the black rock gold, making the material more pure!

After the black rock gold extracts the impurities, the adsorption properties will completely disappear in a very short time, so it can only be a ready-to-use consumable, so the time for extracting impurities is very short, and if the refiner's skills are not exquisite enough, it will still not be able to exert its powerful effect.

Another point, black rock gold not only has an extraction effect on impurities, but also can be adsorbed to normal refining materials, if the refiner is not proficient, not only is it difficult to extract the impurities in the material, but will absorb the essence in the impurities, and those essences that are extracted will be completely destroyed because of this, and the losses caused will be incalculable.

Zuihou, the ordinary leyline fire or the body yang fire of the monk, its temperature is simply not enough to melt the black rock gold, and the higher the material level of the black rock gold extraction, the more difficult it is to adsorb impurities, and the more mana is consumed.

The refining of refining materials has always been the biggest problem in the refining field, and the most important foundation for those highly famous refiners to become famous is to have extremely powerful refining skills, and the existence of refining spirit ores will make them feel like a tiger!

However, the Extractive Metallurgical Spirit Ore has rarely been produced in the cultivation realm since ancient times, and there is no vein that specializes in the production of the Extractive Metallurgical Spirit Ore, it only randomly exists in the leylines of the special environment, and it is completely a priceless consumable product, except for the extremely precious refining materials of the Extractive Metallurgy, under normal circumstances, no refiner will destroy the heavens.

Lin Feng stood in front of this huge mine, frowned and stood still for a moment, and then summoned the Ancient Spirit Worm Spirit Devouring Heavenly Bee from the Sumeru Illusion Ring again!

Tens of thousands of Soul Devouring Heavenly Bees, under Lin Feng's instructions, flew onto the boulder and devoured this huge black rock gold ore with all their might, but in just a few hours, a hole half a foot wide was gnawed on the boulder!

A large amount of crystalline thunder nitrate sand was closely arranged together in front of Lin Feng, although he had visited it before with his divine sense, but after really witnessing these mineral crystals, Lin Feng's face couldn't help but be shocked again!

More than a dozen hours later, the Soul Devouring Heavenly Bee gnawed out a wide enough slit in the Black Rock Gold Giant Mine, and Lin Feng walked directly into it, collecting the Thunder Nitrate Sand one by one, and it took a full meal to gradually empty this space more than ten zhang wide.

There are thousands of these thunder nitrate sand crystals, the size ranges from half an inch to more than ten inches, and the purity is several times higher than that of the thunder nitrate sand in the sand state, but to refine it into a shrapnel bomb, it still needs to be purified, but the difficulty of purification is beyond imagination.

The higher its purity, the easier it is to burst under the urging of spiritual power, and the process of refining the thunder bomb is slow and difficult, and if you are not careful, you will be injured by it, or even directly wiped out!

Lin Feng emptied all the thunder nitrate sand and then put away the Soul Devouring Celestial Bee, and then together with the blood demon, he used the magic weapon to forcibly bombard this huge black rock gold giant mine, and after several hours of repeated bombardment, it finally shattered and turned into countless fine black rock gold crystal blocks, Lin Feng had just swept them up from the ground, and a violent vibration came from the ground.

Lin Feng secretly thought that he was done, so he let the Blood Demon remove the Left Dao Imitation Technique, and quickly withdrew it back to the Sumeru Illusion Ring, and then got rid of the array stone behind him, and was about to use the escape technique to escape from the cave, when a huge divine consciousness swept in at this time!

Lin Feng was startled, the escape technique he was about to perform was withdrawn in time, the Bone Demon Sect Ancestor Hu Yanji didn't know when he actually came to the outside of the mine, Lin Feng suddenly remembered at this time that it had exceeded several hours since the seven-day period he had set!

Hu Yanji's tenth-order bone demonic beast should have reached the zuihou stage, and Lin Feng and Yuan Qian had not returned for a long time, which naturally made him suspicious, Yuan Qian was his personal disciple, under normal circumstances, it was impossible not to go to the main hall to report to him before the end of the stipulated period, and Hu Yanji, who was short of time, could no longer have any delay in waiting for the Yin and Yang Nine Bones.

The whereabouts of Lin Feng and the blood demon naturally couldn't hide it from Hu Yanji's other disciples, and the news of their entry into the mine could easily reach Hu Yanji's ears, and Hu Yanjie came in person to ask Yuan Qian what kind of reputation he was doing.

However, as soon as his divine sense penetrated into the mine, before his body could fly in, a loud noise came from underground, and then he saw a shocking wave rushing out of the mine, breaking through a hole hundreds of zhang wide!

Countless gravels burst out from the cave and shot straight into the profound void thousands of zhang high, and what was amazing was that along with these huge stones, there was also an extremely strong earth yin qi!

The aura of the earth yin rose from the cave to the sky, and the damage caused was beyond imagination, and a large area of spiritual energy around it was instantly eroded and engulfed, and where the qi of the earth yin spread, there was no grass in all corners!

Hu Yanji's face changed suddenly, the mine had collapsed at this time, and his divine sense could not detect the internal situation, but the aura of the earth yin that rushed out of the cave made him easily judge that the underground of this spiritual mine was actually connected to the netherworld!

From the beginning of its existence, there have been rumors in the cultivation realm that it is an ancient powerhouse, using superbly powerful mana, in the gap between the netherworld and the human world, to open up an independent area, in some weak links, it is very close to the underworld, once the stratum is dug through, the qi of the earth yin will penetrate up!