Steel steam and flame

Cassia thought she would be able to reach her destination in one or two hours. When she learned that it was still nearly three hours away, she could only accept it silently. His mood quickly changed, and he thought it might be a good idea to treat this trip as an opportunity to learn about the underground world firsthand. In the past, we could only build models of the underground world through various materials. Now actually coming to the huge underground cavity is a completely different experience.

The super analytical machine is simulated to run at overspeed, and a more detailed model is in the process of being built. After all, there is a limit to the details in the data, and the situation captured with mental perception needs to be much more detailed.

Moreover, there are two accompanying members who take care of both protection and explanation, so most of Cassia's questions can be answered.

After walking for more than three hours, the solid rock beneath the three people's feet turned into a large undulating mass of tangled roots. I chose to take a short rest at this time. Although the journey was not tiring, the sporadic underground creatures encountered were quickly eliminated. But starting from here, the environment will change dramatically on the way forward, and the number of underground creatures will also increase.

The sticky feeling brought by the pollution under his feet told Cassia this, and he needed some time to observe the large group of tangled tree roots in front of him.

After giving a brief explanation to the escort, Cassia went to the front alone. The roots of the World Tree under your feet are slightly soft, and the scattered spiritual perception can quickly establish a connection with it and expand the perception network into the distance.

After walking a little distance, when there was a slight abnormality in the mental perception exploration, Cassia raised his right hand, and a little light appeared on the tip of his index finger, rising to a height of nearly a hundred meters. Then a strong light suddenly emitted, and for a moment Completely illuminate an area thousands of meters away.

"Oh, it's really not a good idea to save physical strength and reserve energy." In the distance, Colius and Slova, shrouded in light, sighed, "As long as you like it, we still know a little bit about you. In the underground world "Li, you are more terrifying than the underground creatures, and your energy should be inexhaustible. I'm so envious."

Cassia shook her head sheepishly, and then turned her attention to her surroundings.

The roots of the World Tree underfoot are exposed, and most of them are not much different from the roots at the bottom of the pollution purification factory. However, on some rhizomes, small pieces of bark disappeared, revealing gray-white branches covered with gnawing marks.

"The food source for underground organisms is the epidermis of the roots of the world tree." Cassia remembered the information in the information, "Energy substances can be completely provided by pollution, but the substances that make up the body almost come from the bark of the tree."

"I don't eat the tree trunk simply because I can't chew it off?" Suddenly I felt curious. The tree trunk under the bright light was emitting almost black smoke, like a flame that was burning it before it was extinguished. Without any extra thought, Cassia took a deep breath of smoke, only to feel that her body was instantly activated by various stimulations, and it suddenly started to work rapidly.

Pursing her mouth tightly, Cassia carefully tasted the puff of smoke with an uncomfortable expression.

"Hmm, it smells bad." He gave a simple comment.

"The pollution is very strong, and it is indeed more difficult to deal with than on the ground. There are highly toxic substances in the air, and there are also some bacteria that can survive in the pollution. The bacteria are very active and can survive in my body for a few seconds before being killed. . And the intensity of the toxicity should be relatively strong, right?”

Cassia is not sure about the intensity of the toxicity here. For him who has stopped paying attention to biological poisons for a long time, he does lack the corresponding awareness in this regard. In the world of surgeons, biological poisons should be a relatively broad field of application, and he had the idea of ​​​​specializing in research. But various reasons later caused him to lose the opportunity to specialize in research.

Of course, he almost lost the chance of being poisoned. This should be a good thing, he often thought.

"It's also corrosive, but very weak." He didn't forget to add at the end.

At this time, Cassia let the horny body cover her right hand to form a sharp blade, cut off a branch of the rhizome, put it into her mouth as food and ate it. At the same time, thick black sap flowed out from the gap on the rhizome. It evaporated before it could flow far, and the thick black pollution mist of the canopy suddenly rose.

I fanned it with my hand, and the pollution mist immediately became much lighter, and the gap on the branch was filled with a soft substance similar to cutin, which was squirming to fill the gap. In one breath, the cut area was removed. Completely replenished. The texture is also assimilated into the appearance of roots and branches, as if it has not been cut.

While watching this magical scene, Cassia chewed roots and branches that had no taste and were full of various harmful substances.

"It's not very tasty." He commented without forgetting, and then swallowed the chewed branches. This time, the body's reaction was more intense, but it was just more intense. After a few breaths, all the reactions caused by the stimulation disappeared, and it was as if nothing had happened.

Compared to the fragments of the ancient historical World Tree and the roots of the same ancient historical World Tree, its value is far less than the burnt fragments.

The cavity of the underground world should roughly form an internal circulation. Cassia thought at this time that rhizomes can indeed be used as food, but if eaten in large quantities, the rhizome network will definitely produce corresponding defense reactions. Otherwise, with the number and appetite of underground creatures, , the rhizome should have been eaten long ago. The emergence of underground creatures onto the surface will be an event often recorded in history.

Cassia stood up, looked around at the tangled tree roots, and began to think about whether the underground creatures that feed on the roots of the World Tree would bring some of the characteristics of the roots of the World Tree. The blood of polluting organisms contains a large amount of pollution and can be used as a material for purifying pollution columns. So can the bodies of underground creatures, such as blood and flesh, condense something similar to fragments of the ancient historical World Tree?

It does not need to be a substance like fragments of the World Tree, as long as it can be used as fuel for the astrophage, Cassia does not care about the specific form. As a feasible direction, this conjecture became an experiment that needed to be conducted and was written down by Cassia.

"How does it taste? I see you ate a big piece." The sudden voice of inquiry brought Cassia back to her eyes. Collyux and Slova were already nearby.

"It's not very tasty. I originally thought it could be used as food and as an alternative energy source in the underground world." Cassia was quite disappointed. "You haven't eaten it? With your stomach bag and body strength, just a taste, it shouldn't work. has a problem."

Collyux and Slova immediately shook their heads: "I tried it. I went to the hospital and lay there for more than half a month. The cost of treatment made all our tasks for nearly two years in vain." The two shrugged and looked at Cassia His eyes changed again.

Cassia apologized appropriately.