Two giant two-headed monsters, resembling prehistoric Tyrannosaurus from Earth, but now with two heads.

"Roar!"

The monster let out a roar, opened its massive jaws, and bit towards Luo Meng and the others.

Luo Meng gripped his sword with both hands and leaped twenty to thirty meters high, slashing fiercely at the monster.

A killing aura rose to the sky, and a streak of cold light cut towards the monster.

Yang Xiao had thought the monster would be slain by Luo Meng's sword, but out of nowhere, a white light screen flickered in front of the monster.

With a buzz,

Luo Meng's sword struck the white light screen. The screen trembled violently but did not break.

The monster exhaled a whirlwind toward Luo Meng in mid-air, and Luo Meng's body fluttered in the wind like autumn leaves, drifting over a hundred meters back. He managed a backflip and landed on the ground.

At this moment, over a dozen Iron Tower Warriors and three black-cloaked men had run up to begin their attack on the two monsters.

Du Tianxing hesitated for a moment, stepped out of the elevator, drew his longsword, and prepared to rush over.

Yang Xiao grabbed hold of Du Tianxing,

"What are you trying to do?"

"I want to lend a hand; this is a great opportunity to show off. Maybe there'll be unexpected gains, or at least I can appear to join. Shall we go together?"

Du Tianxing was looking for an opportunity to earn favor through scheming.

"If you don't want to die, then go ahead!"

Yang Xiao said indifferently, his eyes focused on the battle scene.

Du Tianxing was stunned on the spot, looking at Yang Xiao and then at the distant conflict, unsure whether to go or not.

Gu Beifeng, who shared the same idea as Du Tianxing,

Just as Gu Beifeng and several others were about to descend into the mine, they saw the battle from afar. With a shout, they charged forward with five men.

Yang Xiao was too late to stop them,

Gu Beifeng was dozens of meters away from Yang Xiao.

"Gu Beifeng, don't charge up there; you are no match for them, retreat quickly!"

Yang Xiao shouted loudly.

Gu Beifeng refused to listen; with a shout, he transformed into a ten meters long Tis City tiger, charging at one of the monsters and striking from the air.

Boom!

Gu Beifeng's massive Tiger Claw struck the monster's white Defensive Light Shield, and he felt a shock run through his body, sending him retreating explosively, vomiting blood.

It was only the monster's recoil that Gu Beifeng couldn't withstand.

Gu Beifeng and the others dared to rush up not because they were overly confident in themselves, but because they saw over a dozen Iron Tower Warriors and three black-cloaked men resisting the monsters.

Knowing the extraordinary combat power of the Iron Tower Warriors, they thought handling two monsters should not be a problem. Rushing in to give the impression of helping, hoping to curry favor, and looking for opportunities for change in their life here.

The other four also used their Soul Skills: python, lizard, Werewolf, and spider, attacking the two monsters.

Over a dozen Iron Tower Warriors and the three black-cloaked men also wielded their longswords, striking at the monster.

The entire mine was instantly filled with killing aura,

Despite being fifty to sixty meters away from the battlefield, Yang Xiao felt a wave of palpitations.

The white light screen before the two monsters trembled violently.

Under the combined attack of the Iron Tower Warriors and the black-cloaked men, it finally collapsed, cracking into pieces.

Just as Gu Beifeng and the others were about to cheer, they felt an omen of doom.

The dozen Iron Tower Warriors and the black-cloaked men suddenly flickered with light, each conjuring a Defense Light Screen in front of them.

Seeing this, Yang Xiao shouted in alarm, pulling Chi Lin and Lao Jiu, who were standing by the well, into the elevator, and hit the elevator button. The elevator immediately started to descend into the mine.

Du Tian was standing in front of the mine, witnessing the moment when the monsters' Defense Light Screen shattered. Both stimulated a burst of golden light.

Boom!

The golden light exploded instantly, a violent storm blasted open, and a cloud of purple dust covered everyone within a hundred meters radius.

Du Tianxing felt the threat of death and immediately turned and leaped into the mine.

At this time, the mine elevator had slid down around twenty meters.

Du Tianxing's body landed on the elevator.

Yang Xiao and the others first heard a thunderous boom from outside, followed by the earth trembling, and the elevator shook violently for a few moments.

Then, intense sounds of combat and monsters' roars came from outside.

The elevator had already descended about fifty meters when a fierce purple storm surged down directly from the shaft's opening.

Zhao Benling took one look and exclaimed:

"Oh no, what do we do?"

There was a speed-up button on the elevator,

Yang Xiao immediately pressed it, shouting:

"Defense Light Shield!"

Du Tianxing and others instantly buzzed, conjuring the Defensive Light Shields above them.

Meanwhile, the elevator was rapidly descending.

Boom!

With a violent explosion, Yang Xiao and the others felt the pit shake, as debris rained down from above.

Fortunately, after traveling a long distance, the storm had weakened significantly by the time it reached this point. Moreover, with the elevator's rapid descent, the Light Shields Yang Xiao and the others had conjured were able to withstand the falling debris without much trouble.

With a thud,

the elevator reached the bottom of the mine shaft, and Yang Xiao and the others immediately jumped out of the elevator, rushing into the vast interior of the mine.

The clamour of debris faded away, a pile of rocks fell, and the outside returned to calm.

Yang Xiao and the others were now hiding inside the mine, still shaking from the close call.

"It seems like there's no more noise outside."

"Has the battle finished?"

"Did the Monsters win, or did Luo Meng and his people?"

"Who knows."

"Should we go up and check?"

"Are you crazy? Are you seeking death? If the Monsters won, wouldn't going up now be suicidal?"

"Then we'll just wait."

...

During the wait, everyone began to observe the interior of the mine shaft.

This mine shaft had already been excavated, with a tunnel about five or six meters wide and three to four meters high, but its length was still unknown.

Every fifteen meters or so within the tunnel was a glowing device, likely intended for illumination, similar to emergency lighting on Earth.

The walls of the tunnel were all composed of purple rock,

the entire tunnel was filled with purple rock, but there were no clear, translucent Crystal Stones.

Some rocks were a lighter shade of purple, others were darker, all opaque.

Yang Xiao picked up a piece of purple rock and felt how heavy it was—the density was quite high, much heavier than a similar size iron block on Earth.

"What kind of rock is this, so heavy?"

Old Ninth picked up a piece of purple rock and weighed it in his hand, saying:

"The density is very high, indeed more than twice that of tungsten metal on Earth."

Yang Xiao was startled,

"How do you know that?"

"I majored in geology and mining in college."

Old Ninth said with a proud smile.

Du Tianxing, who had a master's degree in biology, immediately asked:

"Brother Ma, you studied geological minerals? Then could you deduce what these purple rocks before us are?"

Old Ninth laughed:

"I previously studied Earth's geological minerals; I'm not familiar with the geology of this alien planet. However, based on logical assumptions, these kinds of purple rocks must contain some special elements, and those transparent Purple Crystal Stones are natural crystals of such mineral elements. You know quartz crystals, right?"

Yang Xiao and the others nodded.

Old Ninth continued:

"These purple rocks contain such mineral elements, but they can't be used directly, the purity isn't high enough, or they can't be refined. However, those purple crystalline substances are mineral crystals with very high purity, which can be directly utilized."

Yang Xiao paused,

"Luo Meng and his people seem to attach great importance to these Purple Crystal Stones. What do you think, what could be the use of these Purple Crystal Stones?"

(Today's fourth installment)