Chapter 694: Tremor in the dark

Shortly after Arnold and others left the camp, Joan, Hailar, Audrey, and Holden also broke away from the big force that was about to return, and continued to explore.
Joan used the "navigation compass" to survey the surrounding terrain. Within half an hour, he found three tunnels leading to the deep underground space near the camp.
According to the three-dimensional picture displayed by the navigation compass, Joan carefully compared the three tunnels, and finally chose the one with fewer twists and the safest appearance, and led his teammates to drill down from their corresponding "ground navel" and embark on an underground exploration journey of.
In the early stage of the "ground navel", the tunnel space is still relatively wide, allowing four people to walk side by side.
As it continues to go deeper into the ground, the tunnel gradually narrows, and many places are barely accessible to one person.
For safety reasons, Hailar walked at the forefront, Holden followed, Joan walked in the middle of the team, and Audrey was responsible for breaking.
The four ride the lizard on the ground and walk through the dark tunnel.
The area outside the miner's lamp shines completely covered by darkness, making people gradually forget the passage of time.
The tunnel is like a necklace, linking countless high and low underground caves in series. Flocks of bats hung upside down on the cave dome, disturbed by the light from the miner's lamp, sometimes flapping their wings and swooping down, flying back around the dome in a circle above Joan.
Joan led the reins and drove the lizard slowly through the rugged tunnel, sometimes looking up at the cave dome.
Among the four-person team, only the magic miner's lamp was not installed on his helmet.
With the "dark vision" enchanted by the prosthetic eye, he can see the scene in the cave clearly without lighting.
The trajectory of the bat caused Joan's curiosity.
These nocturnal people who live in the dark have poor eyesight and very sharp hearing.
Joan had seen such a statement in a book: when flying, the bat will continue to make a sharp cry, and then collect the echo through the ear, according to the echo to determine the location and size of nearby objects, and whether the object is moving .
With echo positioning, bats can fly at high speed in the dark without hitting any obstacles.
If this statement is true, Joan naturally has an association: as long as the mouth of the bat is blocked so that they can not make a sound, they will lose the ability to discern the direction.
Just as Joan thought, a bat flew past him.
Joan raised his ears and listened carefully.
It's a pity that there are only the sounds of bats flapping their wings, but they can't hear the tweets they rely on for positioning.
Joan frowned and could only think that his hearing was not sensitive enough.
Fortunately, he knows that a spell can make the senses, including hearing, particularly sensitive.
Thinking about it this way, Joan chanted a start-up spell symbolizing the "horn" softly.
"Róma!"
The 3-ring prophecy spell attached to the prosthetic eye, "tremor perception", quietly turned on, and Joan's skin and senses immediately became very sensitive, and he could clearly sense the slight ripples in the surrounding air.
When the bat flew past him again, a miracle appeared!
Joan actually heard high-frequency sound waves emitted from the mouth of the bat-under normal circumstances, human ears can not hear sound waves at such a high frequency.
Joan simply closed her eyes and felt the outside world through her ears and skin.
After closing your eyes, the outside world loses its color and becomes clearer and more vivid.
All creatures in bats, fireflies and rats digging out of the ditch are releasing waves to the outside world, causing light or heavy tremors in the air.
Joan can feel these wonderful tremors, and even like a bat, he can push back the outline and location of the creature according to the tremor-causing waves.
It is difficult to describe in words the "wonder" of the surrounding environment with the body, not the eyes.
Apart from the lack of color, everything is perfect.
At this time, an unusually strong airflow suddenly blew from the cave in front.
Joan's ears twitched slightly, and a slight shudder appeared on the skin.
The air tremors indicated that a large group of bats were flying head-on along the winding tunnel. At the same time they sent out sounds of detection, they also revealed their own existence to Joanne.
"Shock perception" is like a meticulous brush, which sketches the outline and location of the group of bats in Joan's mind.
These bats are stronger than their close relatives.
A pair of needle-shaped tusks growing on the jaws indicate that they are extremely fierce predators.
"Beware!"
Qiao An opened his eyes suddenly, and reminded his companions with a deep voice.
"At 60 yards in front of the tunnel, a large group of vampire bats are approaching us!"
Hailar, who was at the forefront, stopped immediately, staring at the front alertly, and he heard the sound of flapping his wings.
Just a few seconds later, a group of dark-red bats rushed out of the darkness, screamed into the search range of the miner's lamp, like a circling blood cloud, flew against the light.
"Alcar!"
Hailar, who had already been guarded, chanted spellcasting spells and raised a colorful cone of light.
The narrow tunnel was almost completely filled with "colorful jets" from Hailar's palm in an instant.
The vampire bat hit the colorful cone of light head-on, before being exposed to fangs, it was deterred by the spell, and it rained and fell into the sky.
At the same time when Hailar cast his spell, Holden, not far behind, pulled out his sword, like a ray of light smoke drifting past her, wielding his sword in a row.
Several cold lights suddenly flashed in the dim tunnel.
Those blood-sucking bats in mid-air who had just been shocked by the "Colorful Jet" were cut in half by the fast-paced dagger before they landed.
"Little hooligan, your swordsmanship is not bad." Hailar glanced at Holden. "Unfortunately gorgeous, but not practical."
"I don't like to hear your words! Swordsmanship is also an art. In my opinion, "gorgeous" and "practical" do not conflict." Holden retorted rhetorically.
"The pretty words on the bare mouth are useless. Just a big bat came across from the other side. Let me show you what is really suitable for actual combat!"
Hailar held the wave-bladed sword behind his back with his backhand, illuminating the tunnel with the light beam projected by the miner's lamp. An extraordinarily large black bat was fast approaching, and half of his mouth flashed his fangs.
"Treasure fan sister, be careful! It seems to be a'violent bat'!" Holden's face slightly changed.
Hailar smiled confidently, calmly drawn his sword, and struggling towards the fierce bat that was rushing towards him.
In her expectation, this sword was enough to split the ferocious bat in half, but did not pay attention to the terrain restrictions. The giant sword just stuck to the top of the head and was stuck by the stone crack!
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