Steel steam and flame

Cassia found an entrance and exit, the muscles in her throat squirmed, and a powerful penetrating sound was inspired. Layers of ripples appeared in the air, spreading outward for dozens of meters before stopping. And all around Cassia, especially in the fan-shaped area in front, the moist, rotten leaves split silently, turning into boiling and beating fragments on the ground.

The sound cannot be heard by the ears. It carries heavy power and is transmitted along the network of underground passages. Cassia continues to make sounds in an established pattern and maintains the existence of the source, which allows Cassia to locate and get here faster. The tunnel network is too vast. If it weren't for Cassie Hei controlling and intimidating other second-type creatures with his dragon-like aura, this underground tunnel network would definitely be a place where a large number of creatures gather.

Two or three minutes later, Cassia leaned close to the ground to get vibration and sound feedback. Ten minutes later, with a rumbling sound, a huge stone slab was pushed open, and fallen leaves were flying all over the space. Some fell back to the ground, and more fell on Cassie Hei's fingertips. On that ferocious head covered with black scales.

No matter how you breathe, or if you open your mouth slightly and make a sound like "ah, oh, oh,", the hot air spurts out and blows away the fallen leaves. In just a few seconds, the dead leaves have been cleared away, revealing a large area of ​​tree roots that are exposed and entangled. The black wet ground comes.

Cassia came out of the exit, shaking his body from time to time. A large amount of dry soil and debris fell like hail, and Cassia had to step back to avoid it. He didn't bring the giant sword with him, but several years had passed. The growth rate of dragons of the same age was far beyond the growth rate, and the giant sword originally made had lost its due effect.

"Dagger?" It would be better to call it this way. After all, compared to Cassie Hei's body length of more than 140 meters at the moment, after a little time, maybe the contact test of this pollution was successful and a large amount of food was obtained. It can reach a body length of more than 150 meters. At that time, Cassie Hei will also officially reach the fourth stage and become a high-stage dragon.

"Ah, gah, gah gah, ah, gah, gah, gah, gah, gah," Cassia turned around. Even though his huge head was already on the ground, it was still much taller than Cassia. The roaring sound vibrated the air, and there was a faint sound of explosions. But fortunately, the dragon's field of vision is almost 360 degrees, and it can see Cassia standing in front of its head.

The smell and appearance are different from a few months ago, but they are the same as nearly three years ago. This is the simple basis for its judgment.

"I have grown up a lot!" The mental perception described Cassie Hei's body shape at this moment, Cassia sighed, and listened to what Cassie Hei said in dragon language. It’s not a lot of content, it said a lot, but it can be summed up into one thing——

There are many tunnels, the tunnels are big, the tunnels are very long; there are many tree roots, the tree roots are big, the tree roots are very long,,,

At the same time, there is also fear and questioning inside. Cassie Hei felt a very dangerous aura a long time ago, but it disappeared quickly. He also said that he went there again later, but did not find Cassia, so he returned here to wait, and would go there again from time to time. He also said that he had been digging here for a long, long time.

Cassia could only answer in simpler language with emotion, saying that she was delayed by many things and could not return here in time. But in the future, I will probably be able to see myself more often...

Soon after, Cassia jumped on Cassie Hei's head, one person and one dragon got into the tunnel network, and quickly went under the ground with the sound of rumbling.

It was still the part of the visit that Cassia had expected. The tunnel network was Cassie Hei's interest, and perhaps it was also the reason why he felt somewhat safe hiding underground when he was attacked by the surgeon. The voice not only seemed happy, but also excited. From its perspective and understanding, it explained that the tunnel network could go to many places, how long it would take to complete the longest one, and so on.

When the stone slab was covered, to Cassia's surprise, the channel network deep underground was no longer the dark version of a few years ago. The passage is obviously much larger than before, and its depth is also much deeper. There is a weak fluorescence at this moment, a light green to light blue color, coming from the fluorescent moss that appears on the inner wall of the channel from time to time.

It's a big area and can't be seen everywhere, but it is enough for the extremely strong low-light vision possessed by Cassia and Cassia.

Cassia asked in simple words at this time. Cassia stopped and looked at it before replying, I don’t know how long it took for these things to appear, and it doesn’t know the specific time...

Faced with an answer that was not an answer, Cassia could only assume that Cassia went to a place with such mosses and brought them back by scratching them with his claws or body scales.

"Maybe it's because of the roots of ancient trees." Where the fluorescent moss is, there are exposed tree roots nearby. Only these places can maintain a long-term moist environment. With Cassie Hei's current body temperature of 80 or 90 degrees, the temperature in the tunnel network cannot be said to be very high, but it is warmer than the autumn temperature on the ground.

"But fortunately it was not contaminated." At the same time, Cassia was silently thankful in her heart. When he first saw the light green to light blue fluorescence, he immediately thought of uranium-gold radiation. After not feeling the contamination of radiation, I relaxed and started to visit the channel network at a good speed with Cassie Hei as my guide.

After walking through one passage after another, and passing through dozens of huge underground cavities serving as transfer stations, Cassia not only saw the large amount of spare materials piled up by Cassia - polished entrance and exit covers stacked one after another I also saw rocks used for throwing attacks that were much larger than a few years ago...

There was a big pile, and it seemed to be arranged neatly, and there were corresponding reserves in each underground cavity. There are also, but are not limited to, sword-shaped weapons made of rocks, of various lengths and sizes, all of which are marked with strange characters and symbols using their claws. There are also weapons made of ancient tree trunks, dozens of meters in length, which have become dry, and some have a lot of cracks.

Some of them were used, and Cassia saw the gap after being chopped. There are also some that have never been used. They are probably like rocks and are used by Cassie Hei as a spare. But now, the weapons made from the trunks of these ancient trees have become supports for underground cavities. Is it caused by like attraction to each other? Many tangled tree roots have climbed up above, and fluorescent moss covers most of the area, giving it the feeling of a vertical lamp.

A tenacious and exquisite life, Cassia sighed at this time.

After advancing in the tunnel for more than ten minutes, Cassia felt that after walking a long distance, Cassia suddenly roared, with a smell of wanting to share good things, but being afraid.

After listening carefully, Cassia gave a roughly certain answer, and then hit the scales under her body hard - a surgeon's way of comforting dragons. If the force is too light, they can't be felt - so Cassia didn't have to. Worry.

"That piece of ancient historical world... that piece of wood you found when you were digging a tunnel a few years ago?"