The corridor is very deep.

And from the very beginning of the entrance, the volume has increased and decreased, and the smallest height requires people to bend down to pass through. The big place is three meters high like the entrance of the cave, twisting and turning, the more you go inside, the higher the temperature, fortunately, the ventilation in the cave is smooth, and Tang Xiao's body surface temperature is only slightly higher.

Cautiously, he crawled for half an hour, just when Tang Xiao wondered in his heart, where did the danger of suffocating himself come from......

There was a turning point in the deep cavern ahead. And there seems to be a heat source behind the turn, flickering.

Turn the head of the snake.

According to the method just observed, look in the direction of the turning point.

Red!

The overwhelming red heat source is densely distributed on the opposite soil wall, like the snow is sprinkled with moving sesame seeds, slowly moving......

It's a swarm of ants!

They are not very large, much smaller than the ants, and there are no thick and sharp weapons on their front jaws, but their bellies are invariably a little swollen, and their whole bodies are red.

This kind of ant, even Tang Xiao, who has rich experience in surviving in the wild, can't tell what kind of species it is for a while.

"The heat sources are not emitted by them, they just seem to be ...... Nibbled? ”

Tang Xiao slid over, even without the snake scale armor, these little ants couldn't break through the snakeskin defense that had reached level 6 at the moment.

Click!

Seeing a giant creature approaching, the ants scattered and burrowed into an unknown corner below.

"It turns out that this is not a dirt wall, but something like that...... Something like visceral secretions? Tang Xiao approached, spitting out the letter.

The strong sour smell came again.

In front of him, it was not the earth wall that sealed the corridor, but a thick layer of blood-red secretions, like the internal organs of some creatures, which at first glance seemed to still have life.

It was mottled with what appeared to be the feces of some kind of animal, from which the heat source emanated.

"Animal droppings?"

Tang Xiao frowned.

At this moment, he didn't care about nausea, shook the snake's tail, and whipped violently towards this layer of viscous secretions.

Gollum –

There was no crisp sound, like a wooden pestle stirred into the sticky paste, Tang Xiao's tail was dented in, but it was quickly bounced out again.

Tang Xiao's body was hot.

It is a cold-blooded animal, and the temperature in its body will change with the temperature of the outside world, and when the snake's tail is slapped on the secretion just now, the temperature inside can be clearly felt.

From the point of view of touch, this layer of secretion is not hard, and the thickness of this layer of material is only about a few centimeters at most, it is not aggressive, but it is extremely tense, and the blow just now is enough to stun an adult rabbit, but the secretion of this closed tunnel is unscathed.

Look around.

If you want to move on, you have to destroy the secretions that block the road, or turn into insects and rats and burrow through the ground.

Take advantage of those ants?

Tang Xiao thought of his queen ant skills, which was a good method, but now he wanted to try it again.

From the edge of the secretion, Tang Xiao opened his fangs.

Although the snake's bite force is not strong, its fangs are also sharp, and he wants to see if he can bite through it directly.

Hiss!

A piping hot feeling.

The fangs pierced into the secretions, and Tang Xiao shook his head, wanting to puff up his breath and directly cut a hole.

But it's strange to say.

I don't know what this secretion is, but just like my original jelly body, the scratched place is quickly filled by the surrounding substance.

There is no way around it.

"There's a new hint for the adventure area."

A voice came from the system.

Tang Xiao looked at it from his mind:

"The droppings of a fire bat."

"The fire bat, a special bat infected and mutated by a fire-based treasure, has a certain fire-based damage ability."

"Expedition progress is 30%, and the map of the expedition area is opened."

Then, next to the coordinates sent by the guide at the beginning, a square flat map appeared here.

After glancing at it, Tang Xiao analyzed it.

In the middle, there is the location of the skull, where the treasure and guardian monster are located, and it is on a slightly higher level than here, probably in the middle of the waterfall, at a level position.

The red dot, representing himself, is behind the treasure, similar to the location of a back door, but it has been blocked by secretions, but in the display of the map, it can go straight to the treasure.

There were several other similar forks around the treasure, all of which were marked with question marks, and I didn't know where to enter, and I didn't know if I could resist the middle position.

Directly above, there is a very conspicuous main road, which is obviously the main entrance to the treasure burial place, but it is ......

Tang Xiao put the two maps together, and the more he looked at it, the more he felt that something was wrong!

But just when he was about to come up with the answer......

Sa!

The sound of breaking wind came from the direction of the corridor behind him!!

Is there a situation?!

Tang Xiao hurriedly turned around the snake's body, staring vigilantly in the direction it came, it was puzzled in its heart, starting from the cave, there was no fork in this underground passage, and he could be sure that there were no other creatures along the way.

Alien creatures?

Unless there was the same test subject, who jumped from the top of the waterfall and crossed the dangerous little lake like himself, there were no living animals in this area.

Finally......

What is it?

It's fast, and there's no noise of rubbing on the ground......

Less than ten seconds later, a few red dots appeared in Tang Xiao's sight!

In mid-air!

Three bats with red wings, pointed ears, and a head like a mouse appeared in Tang Xiao's field of vision.

Although their mouths were open, they seemed to be screaming intimidatingly at Tang Xiao, but the surroundings were still quiet.

No wonder, I didn't find any signs along the way.

The sound produced by these bats is ultrasound, which ordinary animals simply cannot accept, and they only care about probing ahead, but neglect to constantly turn their heads to look behind them.

"It's not like an ordinary bat......" Tang Xiao's heart tightened.

On closer inspection, the lower abdomen and wings of these bats contain extraordinary heat, at least ten times warmer than the rest of their bodies.

This is absolutely impossible for mammals.

"This is the fire bat in the system prompt." Tang Xiao was sure in his heart.

Since the other party had a certain ability to control fire, Tang Xiao stretched out his body to prevent the next possible attack by concentrated fire, and at the same time, the snake scale armor and mixed venom were ready at the same time.

Because the opponent has its own air mobility that is difficult to reach, it is very important that the first encounter can inflict heavy damage on this fire bat!