Several people lay down next to a slag pile for a long time, and finally waited until the aliens had finished transporting all the evil iron ore. Under the command of the alien leader, cart after cart of ore was pulled into the giant cave. Although Xiao Rui and the others were still outside the cave, they could still hear the sound of the giant bellows pulling inside, and there was also a tinkling sound from deeper inside.

Following the foreign leader to the cave, Xiao Rui and others carefully lurked in the shadows.

This is a huge artificially dug cave, with a smelting field near the entrance. Dozens of giant blast furnaces are burning with blazing flames, and the evil iron ore in the crucibles above is melted into evil green molten iron.

Each blast furnace has a bellows, whirring air into it. The fuel in the furnace emits a bright red flame, and the naked laborers continue to add fuel to the furnace.

Xiao Rui and the others were observing from the shadows, when a group of alien guards patrolled towards the entrance of the cave. The leader was a black mecha, which was exactly the same as the one Xiao Rui saw with Wu Mashan three years ago, especially the bat logo on the shoulder.

The commander in charge of the smelting site saw the patrol guards approaching and went to say something to the black mecha. At this time, they used a language that Xiao Rui had never heard before.

The mecha stood up and seemed to salute a military salute, then led the patrol in another direction.

After observing for a while, Xiao Rui made a forward gesture toward the depths of the cave. Long Siyuan understood it, and the three of them moved carefully.

After bypassing one blast furnace after another and avoiding patrolling guards, Xiao Rui and others came to a gate. This giant iron door has been hung high on huge hinges. There are two guards in iron armor at the door, holding an exaggerated axe.

Xiao Rui and the others were lurking in the shadows, thinking about how to get through the door.

After a while of silence, Xiao Rui said that he had used something to make a strange noise, attracting the two guards to check, and then took the opportunity to pass through the gate.

This proposal was approved by the other two people. After some discussion, it was decided that Long Shun would lead the guards away, while Xiao Rui and Hei Siyuan took the opportunity to enter. The deeper investigation was completed by the two of them. After Long Shun lured away the guards, he lurked outside to take charge of the response.

Long Shuan walked around to the opposite side of Xiao Rui and observed his surroundings. There was a blast furnace that was out of flames. Long Shun reached out and pushed the crucible above, and made a"good" gesture to Xiao Rui, who nodded.

Long Bo put the sword on his back and pushed the crucible with all his strength. The crucible fell to the ground and made a"rumbling" sound. Sure enough, the two guards heard the sound and walked towards this side with axes in hand.

When Long Shun saw the guards coming, he fled elsewhere and watched from a distance.

After the guards left, Xiao Rui and Hei Siyuan took action immediately and quickly passed through the gate.

As soon as I walked through the door, waves of heat hit me, and the huge banging sound was deafening. This is a forging room, where the molten evil iron is pulled and forged into iron ingots.

There are dozens of anvils here, and in front of each anvil are two shirtless alien blacksmiths. The exposed muscles show explosive power. One of them is responsible for clamping the iron block with large iron tongs, and the other is beating it with a hammer, making a clanging sound.

Observing while moving forward in the shadows, the guards here are relatively less strict. Apart from the patrolling mecha, no other supervisors are seen!

The two walked around the forging ground and didn't find anything special. They just saw a small passage on the right side. Small is only a relative term. Compared with the heights of Xiao Rui and Xiao Rui, it is still quite large.

After waiting here for a while, the mecha guard came with a patrol team and stopped at the entrance of the passage for a while. The mecha guard led the two people towards the passage, while the others continued to patrol the forge.

Hei Siyuan gave a questioning look, and Xiao Rui nodded. After the other guards left, the two hung behind the mecha guard and followed it toward the passage.

The passage was winding and winding. After walking for a while, after passing a corner, I saw that the mecha guard had arrived in another workshop. After they walked away, the two of them also came to the workshop.

There are also some blacksmiths here, but compared to the forge, there are obviously a lot less here. There are more civilian mechas. They are responsible for hammering and shaping here, and the evil iron ingots transported are processed into mecha parts here.

Rows of mecha parts of various shapes were piled on the ground, at least hundreds of them. In the depths of this workshop, various parts were assembled to become semi-finished mechas. Finally, an energy core was added, and a mecha with explosive combat power was successfully produced.

Deeper down, a majestic mecha is displayed here. Although it is just a shell and has no energy core injected into it, their chilling aura can still be seen.

Opposite these mechas, the energy cores glowing green are stored in the grids on the wall. Those green lights contain a huge amount of energy, which is the key to the combat effectiveness of this mecha.

Compared with the magic core used by the Zenas Empire mecha, this energy core that absorbs evil energy brings a stronger visual impact. Only Sarangye Iron, using his affinity for evil energy, can truly withstand the power of this evil energy.

As for the source of evil energy, the empire currently does not have much information. Some say it is the power of the void absorbed, some say it is the original power of the universe, and some say it is the power of demons from other worlds. In short, this power is very evil. The body of a person or creature killed by evil energy will be destroyed into powder by this energy, and the soul will become the source of evil energy. The entire continent is forbidden to study evil energy, so Sarangye Iron's ability has not been discovered before.

Now, there are so many evil mechas here. Xiao Rui roughly counted them, and there were more than fifty. If they had really been brewing for decades, how many mechas would there be, and how terrifying the combat power they formed would be!

"You must report this to your father immediately."Xiao Rui said softly

"Yes, my dad needed to take action immediately."Hei Siyuan nodded.

The two of them observed for a while. The investigation task this time has been completed. The two of them were ready to return along the original road and leave here.

Just when the two of them walked to the entrance of the passage, Xiao Rui saw something on the ground. A small part, the size of a finger, similar to a bolt. He reached for it, preparing to take it back as evidence.

Before Hei Siyuan could stop him, Xiao Rui had already got it.

"alarm! alarm! Intrusion alert!"There were piercing sirens all around, and red lights flashed on the walls.

"You've been discovered, run away!"Hei Siyuan pulled Xiao Rui and rushed into the passage.

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