On a rainy night with thunder and lightning, Nano flew in the air on his back and fell quickly like a meteorite, with a whistling wind in his ears.

The sky here was shrouded in dark clouds, and except for a moment of lightning, the whole world remained pitch black.

On the right, a huge waterfall stretches for dozens of miles, and the waves of the river roll down with the name, being pulled into a white light veil.

On the left, an ancient castle rises from the bottomless ground like an optimus pillar, all the way up until it disappears into the black clouds.

In the distance, there are rolling hills and a large winding river, and the downpour is pouring into the dense forests there.

"What the hell is this place?" Nano looked at the scene in front of him, puzzled even more.

I don't know how long it took, but Nano finally fell to the ground, like a bullet into the mud, and didn't stop until he was twenty meters deep.

Although his whole body was in great pain, Nano crawled out of the ground, dragging his body covered in mud and slowly moving forward under the heavy rain.

The ground here is very soft and a bit like a bath due to the rain that washes it all year round, but it can still support the walking of ordinary animals. Also, the whole land is a little hot.

Even in this environment, there are many plants growing here and there is a dense rainforest. It's just that these tall-looking trees aren't ordinary trees. They have no leaves, and their dense branches are covered with countless delicate white roots.

Na Wu walked forward blindly, and his consciousness was quite vague, and soon he came to a hundred-meter-high giant tree and sat down against the trunk.

Just as Na Wu was about to close his eyes and rest, a bolt of lightning struck, and he accidentally saw a one-man tall skeleton perched on the thick branches above his head, which looked like the skeleton of a bird of prey.

Even if he didn't have a name, he couldn't help but be taken aback by this sight.

"Am I in the legendary hell?"

With a bolt of lightning that he could not see, the big bird suddenly spread its skeletal wings, swooped down, stretched out its claws, and grabbed at a white bony animal like a dog, and then took its prey, flapped its wings and flew to another tree, pecking at it.

Na Wu could clearly hear the whirring wind driven by the skeleton bird waving its wings.

Nano, who was a little sober, had noticed that it was surrounded by such skeleton creatures, large or small, long or short.

Moreover, during this period of unobserved, countless scenes of hunting and hunting were staged. The screams, roars, and screams of countless animals rang in the ears, and it was simply a hellish jungle where the struggle for survival was fiercer than anywhere else.

Soon, Na Wu was surrounded by dozens of ferocious skeletons, and he only heard them roaring in a low voice, but he didn't dare to move forward, observing Na Wu like an alien.

Among them, a twenty-meter-long serpentine skeleton slowly leaned over, and after hesitating for a moment, it suddenly rushed towards Namurai at an extremely fast speed.

At this moment, Nano was seriously injured, and he didn't want to fight with so many skeletons who didn't know what it was, so he jumped out of the encirclement. And when these skeletons saw that they had no name in sight, they all chased after them, behaving like ordinary beasts.

Nano ran all the way, and he didn't know how many skeleton animals he stepped on, and just when his body was almost unable to hold on, Nano saw the lights flashing in the jungle. Nano ran towards the light, and found a wooden house built on top of a large tree, and outside the door, a wooden ladder was wrapped around the big tree, connecting with the ground.

Nano went under the tree and found that all the skeletons chasing him had retreated, as if he was afraid of the lights.

Nano walked down the wooden ladder towards the wooden house, and when he came to the door, he was about to knock on the door, when he heard the voice of an old man from inside the house.

"Come in, young man. ”

Nano pushed open the wooden door and walked in carefully, only to be surprised to find the skeleton of an old man sitting inside.

"Please take a seat!" the skeleton stood up, hunched over his back and on crutches, poured a cup of tea and handed it to Nano, then put on his clothes and hat again, and returned to his seat.

"That should look a little better. The old man straightened his clothes, hiding his body under the clothes as much as possible, and then said, "Forehead...... It's been a long time since anyone from above has arrived. Young man, how did you get to this forest of bones?"

"Are you living creatures or demons?"

"Uh...... Although we can only see bones, the creatures here are actually living creatures of flesh and blood. ”

"Flesh and blood?"

"That's right, it's just out of sight. As you can see, there is never light here. Over time, the animals here no longer rely on their eyes to move. The pigment of the body has also become superfluous, whether it is the skin, hair, internal organs, and even blood has become transparent. That's why it looks like a skeleton. In addition, half of the water flows from the waterfall to the Hidden Water River, and the ground temperature here is high, so the transpiring water vapor has nowhere to go, and when it encounters the relatively cold dome above, this never-ending heavy rain is formed. ”

"What about you? You seem to be able to see things. ”

"We're probably the only creatures here that still rely on the light to act, no, I'm the only creature here that sees the world through our eyes. Everyone else like me is dead. Because we use fire, the eyes are always useful. ”

"Did something happen?"

"No, no, we really don't have enough adaptation to the environment here compared to the other creatures out there. So, many years ago we built the castle that opened directly to the earthly world, and we wanted to get out of here. But before you could use it, it was taken over by the people on your ground. To this day, I'm the only old man left to survive. ”

"You built that castle because you built it, it's a majestic building. ”

"Yes, old man, I was also a hot-blooded young man when I was young, and I always wanted to take back the castle and lead everyone out of here. However, in the end, it failed, and many of your clansmen died at the hands of your earthlings. I hated you when I was young, but now I ...... Now that all the clansmen are dead, it is useless to hate them. In addition, we later discovered that if you were exposed to direct sunlight on the ground, you would get sick and die. Whether it's here or on the ground, it's not a place we can go. The demise of our race may have been arranged by heaven a long time ago. ”

"It's a really sad story. ”

"How did you get to this underground?"

Nano told the old man about being beaten down.

After hearing this, the old man pondered for a moment, and then said: "The three princes of Qiongguo, it was the royal family of Qiongguo who occupied our ancient castle before, and I fought with them when I was young. It seems that you and I are quite fated. In this case, I will teach you our own fist technique, the Shadow Trace Fist. Hope you can help defeat them and rescue your partners. ”

"Thank you very much!"

"You've been using knives before, so you probably don't know much about boxing. I'll start with a brief introduction to the basics of boxing. ”

"Unlike swordsmanship, boxing is characterized by the use of speed and strength to outwit opponents in hand-to-hand combat. And all punches can only be used to their advantage when they are close enough to their opponents. And when the two are close enough, it is difficult for the sword to exert its power. That's why you were defeated by the three princes of Qiong. ”

"This set of Shadow Trace Fists has been mastered by our clan in the fight with other beasts. Ideal for fighting large opponents in the dark. I'll demonstrate it below, you just have to watch, how many tricks you can learn are a few tricks. ”

After saying that, the old man started boxing.

After reading it, Nano practiced it a few times in his heart, and he roughly remembered it.

At this time, the old man handed over another book to Nano, "Take this book too." It is a mental book that has been summarized by generations of our people when they live in this dark underground world. I will give it to you now, and it will not be in vain for my people to go back to this world, and we will leave something for the world to use. ”

At this time, it was late at night on the ground, and there were no names and serious injuries, and under the arrangement of the old man, he quickly fell asleep.