By the clear stream, a grass carp kept struggling and jumping on the bank!
"No..."
When Jia Yan withdrew his proboscis from the grass carp's head.
The grass carp was already lifeless, its massive body lying on the cold sandy ground, breathless!
Jia Yan fell silent for a moment, then shook his head.
After his examination, indeed, he found no existence of any mysterious fluid in the grass carp's brain!
So his guess was correct.
Whether it was the medicine from the Northeast Wild Tiger Factory, the black liquid, or this underground world, they could only promote the mutant growth of insect-like creatures, perhaps even only certain specific species of insects!
What secrets lay within, Jia Yan was still unclear, but at least this most basic rule had been discovered by him!
"I have never even seen a purely successful mutation of a flying insect before. Of course, the giant centipedes of this underground world don't count because they are the natives here, not mutant creatures at all."
"So my mutation will be unique. If my previous guess is correct, it's not that the order Diptera insects cannot mutate, but because their constitution is too weak, too weak to withstand the ravages of the mutation force, leading to inevitable death."
"And precisely because my previous body was so weak, my progress and plasticity are the greatest! The body that has mutated step by step has long since covered up the weak body from before the mutation process, so I will have more growth potential than other robust creatures like centipedes!"
Because of weakness, there is even more potential!
Jia Yan looked around, the ground by the stream was where the red-headed centipedes had died a few days ago. But now there were no bodies of the red-headed centipedes to be seen, and he didn't know which carnivorous animal had dragged them away!
Leaving the large fish there, Jia Yan flapped his wings and flew up from the ground...
In flight, constant analysis.
Some things become clearer the more you think about them.
Jia Yan flew past a thicket!
This thicket, in fact, should be called a bush, but because the vegetation was so lush, it seemed like a large bush, covering a wide area.
It was in this bush that a pair of bulging huge eyeballs stared at Jia Yan's flying figure.
As Jia Yan flew over the top of these eyeballs!
Those bulging eyeballs suddenly turned!
In the next moment, the owner of those eyeballs suddenly spat out its soft, slender tongue!
The tongue was like a flexible little snake, making a piercing sound in the air as it shot towards the flying creature in mid-air!
Jia Yan, in the air, was originally thinking about things. With a human soul within him, he was unable to stop thinking for a moment, so sometimes his vigilance would decrease.
In the instant the tongue shot out, he also saw the attacking object through his compound eyes!
He wanted to dodge, but the tongue was too fast!
Before he could dodge, the tongue stuck to his abdomen, and then a huge force pulled him downwards!
By now, the predator's figure had already been exposed in Jia Yan's eyes, it was a giant toad with disgusting protuberances and bumps all over its body!
This toad was over thirty centimeters in size, lying on the ground like a lump, really huge.
"Hmph, just a giant toad!"
Jia Yan's compound eyes flashed with a strange light, then he flapped his wings hard!
Buzz!
His whole body flew upwards, easily breaking free from the tongue sticking to him.
Having mutated so many times, Jia Yan's strength far exceeded his own body size long ago. He couldn't even guess how strong he was now!
His mosquito body spun in the air and aimed towards the toad below, preparing to attack head-on!
"No! This toad looks poisonous."
In mid-air, Jia Yan looked at the toad covered in bumps, sighed slightly unwillingly, but still flapped his wings to fly away from this thicket!
Even if the toad wasn't poisonous, he didn't want to kill such a disgusting creature.
He doesn't even eat meat, so killing it wouldn't benefit him anyway.
"It seems that I need to try in the future whether my body has resistance to toxins. However, mutation is not omnipotent. Even if the body develops resistance, it is impossible to be immune to all poisons."
The sound of the mosquito flying echoed far in the underground space.
In fact, this space was only about five kilometers long and wide, and if Jia Yan flew at full speed, it wouldn't take long for him to fly from one end to the other.
But he didn't do that, instead, he kept patrolling in the sky.
"There seems to be human world items on the ground over there!" Not long after, Jia Yan saw some shiny things on the ground.
He flew over.
Observing left and right, after confirming there was no danger, Jia Yan controlled his body to land.
It was a mirror, shining on the surface, even after many years, it still clearly reflected Jia Yan's mutated and fierce proboscis.
"It seems that the humans who died in the cave have also been here." Jia Yan looked around, didn't find any more human items, and flew directly into the sky.
There were too many reasons why humans could die in this underground world.
The appearance of those humans was that they were wearing military uniforms and equipped with firearms and ammunition. But in this underground world, there were many terrifying giant creatures, and Jia Yan could move freely now because he had the advantage of flight.
If humans advanced on the ground, encountering giant creatures, the possibility of being killed would be very high.
Of course, for humans with firearms, ordinary giant creatures might not be enough to stop them.
But there was another most powerful killer that would leave even humans with firearms helpless, only waiting for death!
That's the toxins in the air!
Yes, Jia Yan had thought about it. Although he speculated that the key factor in the gigantism of animals in this underground world was the air, it might not be a good thing for humans.
Even for many creatures, this place would not be an easy place to survive.
So the scene from decades ago, Jia Yan could roughly deduce.
The human teams that finally managed to kill some giant creatures, but because of the toxins in the air, they died of poisoning one by one. In the end, when they escaped towards the cave, a large part of them died on the way!
"Then some Japanese institutions discovered that the air in this underground world contains special substances!"
"Immediately afterwards, factories appeared above the cracks connected to the caves. And then, wars broke out in places like factories!"
"It was directly forgotten and abandoned for decades until it was reactivated by the Northeast Wild Tiger using certain means. This... should be the whole process of the event."
Jia Yan felt that his speculation was not far from the truth.
Buzz!
He was still flying in the air.
Sometimes, there were even some huge creatures below that attacked him when he flew at a height of ten meters!
A bug that looked like a bowing beetle, but its body was hundreds of times larger than the usual bowing beetle. This guy thought Jia Yan had invaded its territory, and when Jia Yan flew over its territory,
its head banged on the ground, and its body instantly bounced up, crashing towards Jia Yan in mid-air!
Jia Yan naturally dodged easily, and the beetle didn't even touch a single hair of his.
The number of creatures here is extremely large, but for some reason, food sources are also very abundant.
At least enough to sustain such a large number of creatures here.
They were full of aggression, not to mention carnivorous animals, even herbivorous animals like bowing beetles were extremely brutal!
"Perhaps it is influenced by the special air and environment here, I also need to be more careful..."
Jia Yan felt it necessary to control his impulse to kill, otherwise, what's the difference between him and these wild animals?!
Just as Jia Yan continued to explore this world.
"What's that? Another human item?"
Something lying on the ground, almost half buried in the soil, was keenly observed by Jia Yan's compound eyes!
Jia Yan looked around.
There was a snake over three meters long, coiled on the ground resting.
This giant snake was obviously a cobra species, but its body was directly green, similar to the color of the surrounding vegetation.
Jia Yan hesitated for a moment, then looked at the human item buried less than five meters away from the giant snake.
He was considering whether to go down and investigate this item!
If it was another mirror or a rotten helmet, there was no need to take the risk. Because no matter how you look at it, that giant snake doesn't look like something good to provoke...
"It doesn't seem to be a mirror or a helmet, what is this... a notebook?!"
There was a gleam in Jia Yan's compound eyes!
If it was a notebook, then it was worth taking the risk to snatch it!
Because such notebooks usually record important events. Especially if these humans were soldiers, it might even be official records.
If there were some secrets recorded on it, or other important things these humans discovered here, it would be of great help to Jia Yan.
Although... Jia Yan didn't understand Japanese or anything.
But the Japanese characters were influenced by Chinese characters too much, and a large part of them were Chinese, so even if he guessed and interpreted, there was a great chance he could figure out something!
Thinking of this, Jia Yan made a decision!
The sound of his flight had long alerted the green-eyed cobra below.
At this moment, the large snake was flexing its muscles at the seventh inch, its mouth making a hissing sound, continuously spewing snake letters!
This was a threat to Jia Yan!
"Regardless, I must get this notebook!"
Jia Yan flew towards the giant snake below!