Bai Yi's eyes were staring at the strange entrance of the cave, and the white bone path on the mud outside the cave was too weird, giving people an eerie feeling.

The cave was gray, it looked deep and treacherous, and it was impossible to see what it was, if other monks saw the cave, they would definitely be far away, but Bai Yi stopped because of this, and a strange color gradually appeared in his eyes.

"Dark bone crocodile, Tiangang Rock, I didn't expect to encounter this kind of material. ”

Talking to himself in his heart, Bai Yi cautiously exuded his spiritual sense, perceiving the white bone path outside the cave, and finally took a long breath.

The cave is indeed a cave, but the white bone path outside the cave is not a path, but an extremely rare fifth-level demon beast, the tail of the Dark Bone Crocodile!

The fifth-level demon beast of the Dark Bone Crocodile is very strange, the body is like a giant crocodile, the tail is like a bone sickle, it is not a worm demon, it likes to bury its body deep in the ground, it will not climb to the ground easily, and it sleeps all year round, and it likes to swallow a rock called 'Tiangang Rock' the most.

Tiangang Rock is a kind of peculiar rock containing the wind of nine Tiangang, which is condensed by the sand Shuo that has been floating in the air for a long time, and has been blown by the Ganggang wind for many years, once it falls, it will sink deep into the ground, which is extremely precious.

Tiangang Rock is not only the favorite food of the Dark Bone Crocodile, but also a very cherished refining tool and array material, many strong people who are proficient in the wind system Dao method, have been looking for Tiangang Rock all their lives, if Tiangang Rock is refined into a magic weapon, their own strength will immediately increase.

Tiangang Rock contains very little power of Gangfeng, and Gangfeng is the strongest form of the Wind Dao Method, refining the Tiangang Rock into the magic weapon, this magic weapon also contains a trace of the power of the Gangfeng, which is urged by monks who are proficient in the Wind Dao Method, and is extremely powerful.

Not only magic weapons, but also some extremely powerful puppets also need Tiangang Rock, such as the highest-level thousand-machine puppet.

Once the high-level thousand-machine puppet is refined, its own power is capable of fighting Jindan, Tiangang Rock is an important material for refining high-level thousand-machine puppets, and when the trace of Tiangang Rock is found, Bai Yi's heart is overjoyed.

Bai Yi's greatest joy was not that he was expected to refine a high-level Thousand Machine Puppet, but that the material of Tiangang Rock could arrange the Dry Wind One of the Ten Great Formations of the Ancient World!

The names of the ten great arrays of the ancients, even the Jindan monks know unknown, from the ancient monks, those ten kinds of battles are terrifying formations that can destroy the gods and even the combined powerhouses, and the fierce names are famous, and they are powerful through the ages.

With Bai Yi's current realm, there is no ancient battle, but when encountering this rare material, there is no reason to let go, although no shadow of Tiangang Rock has been found, Bai Yi can conclude that there must be Tiangang Rock in the cave where the dark bone crocodile is hidden.

Retracting his spiritual sense, Bai Yi had already sensed that the huge white bone tail of the Dark Bone Crocodile was completely angry, this was not a sign of the death of the Dark Bone Crocodile, but that the Dark Bone Crocodile was falling into a long sleep, as long as he didn't wake up this fifth-level demon beast comparable to a Yuanying Monk, he would have the opportunity to obtain the Tiangang Rock in the cave.

In a few vertical jumps, Bai Yi sensitively stepped on the white bone path and came to the entrance of the cave, not directly into the cave, but raised his hand to pinch the spell, and with a burst of cold air, ice began to form on the white bones.

The use of the Ice Dao Method completely froze the tail of the Dark Bone Crocodile, and Bai Yi was not worried about waking up this demon beast, because the colder it was, the stronger the drowsiness of the Dark Bone Crocodile would be.

Looking at the frozen white bones, Bai Yi nodded with satisfaction.

Since entering the cave, Bai Yi's feet have always been uneven, and what he is doing under his feet is not earth and rocks, but the huge back of the Dark Bone Crocodile.

Walking more than a dozen feet away, a strange rock appeared in front of me, and from the outline, it could be seen that it was the head of a giant crocodile.

Bai Yi used his Dao technique again, wrapped the entire Dark Bone Crocodile with ice and snow, and then ignored this terrifying fifth-level demon beast and continued to move forward, as long as he didn't make a thunderous movement, the Dark Bone Crocodile would not wake up easily.

After walking less than a hundred feet, the cave opened up in vain, and here was a great grotto, the ground was muddy, covered with a thick layer of green moss, and seven or eight tall stalagmites hung overhead.

The hanging stalagmites seem ordinary, but they give people the feeling that they are about to fall, as if these stalagmites have been smashed directly into the ground from an extremely high altitude, with an indescribable sense of impact.

"Sure enough, it's Tiangang Rock!" Bai Yi raised his hand and touched a huge stalagmite, and said in a low voice.

Tiangangyan may be unfamiliar to others, but for Bai Yi, the former scattered immortal, he is really familiar, after determining Tiangangyan, Bai Yi took out Liuyanding from the storage bag, urged it with spiritual power, and began to refine.

Tiangang Rock is too hard, it can't be cut with magic weapons, only magic weapons can do, Bai Yi doesn't have magic weapons now, so he has to use the slowest method, using earth fire to slowly refine.

Fortunately, I bought a Liuyan Ding in the deacon's hall last time, if I didn't have the power of earth fire, I would have to empty the treasure mountain this time, the hardness of Tiangang Rock, even if it was a void tripod, it couldn't be refined, unless it was to give birth to Danhuo.

In the cave, Bai Yi slowly refined the Tiangang Rock, in this dim underground world, the other disciples were facing all kinds of dangers and insect demons, the disciples of the three sects had fallen to the ground by nearly 10,000 people, and in less than a day, there were already less than half of the disciples sleeping here.

Some disciples were devoured by terrifying insect demons, some were drowned in the mire, but the disciples who died in the underworld were killed by their own clan.

In order to survive longer, this underground world has become a battlefield for snatching spirit stone magic weapons, everyone knows that if there are no weapons and spirit stones, they will definitely not be able to get out of here, only the people with the most spirit stones and the most advantageous weapons can survive to the end.

If it were in other dangerous places, the disciples of the three sects might be deceitful when they met, or they might look at each other coldly, and rarely do it directly, but in the underground world, the monks have no scruples, and for the sake of their own life and death, people don't mind killing their fellow clans first.

As time goes by, the darkness of the underground becomes more cold and depressing, even between the same doors that do not know each other, there is also a bloody sword shadow, once you can't get out of the underground for a long time, without the appearance of insect demons, the monks themselves will fight each other to the end.

Bai Yi spent a full day refining in the cave, used up all the earth fires in the Liuyan Ding, and finally collected hundreds of fist-sized Tiangang Rocks.

If Liuyanding loses the earth fire, it is useless, and Bai Yi can only leave the cave.

There were still four stalagmites on the top of his head, Bai Yi secretly said that it was a pity, so he didn't linger, walked out of the cave, and continued along the river.

The road ahead became gradually narrower, and after walking for more than an hour, Bai Yi returned to the kind of passage that extended in all directions, but fortunately, the river was still flowing, and the direction of progress was always correct.

Along the underground river, Bai Yi shuttled through the dim passages until a miserable wail came from afar.

The footsteps didn't even pause, Bai Yi still moved forward, that short and miserable wail could only indicate the loss of a life.

With the aftermath of the screams, the front opened up again.

This is a spacious passage, like the shape of a gourd, appearing between the vine-like passages, the passage exudes hundreds of strong or weak aura fluctuations, actually standing full of disciples of the three sects, but these disciples are not snooping on other people's magic weapons and spirit stones, they are all staring at the stone wall above their heads as if they are facing a great enemy, and their eyes are full of endless horror.