Dozens of Intelligent Rat slaves worked hard. First, Jilasha shoveled the ore loose on the ground, then loaded it onto a small cart, and the Intelligent Rat slaves dragged it to the furnace. The location of the furnace is lower than the river bed. After setting up the wooden planks, the Intelligent Rat can directly push the cart to the feed port. When the cart tilts forward, the ore is easily poured into the furnace. A red light appeared in the thick belly of the furnace. The red light seemed to be reflected through the furnace wall. Even from a few meters away, the heat coming from the furnace could be clearly felt. When the heat subsided, the furnace trembled a few times, as if something was stirring inside. From time to time, gray-black smoke spewed out from the exhaust port, occasionally carrying flames. Then the water outlet was opened, and the red and hot iron water flowed down and poured into the channel. Fifty or sixty wise rat men, each with a wheelbarrow, kept going back and forth between the riverbed and the furnace, barely able to keep up with the smelting speed of the furnace. The molten iron flows down from the head and gradually fills each module. Rob has already calculated that according to the refining speed of the furnace, when the last few rows of modules are filled, the first filled modules will have solidified. The red iron bricks can be easily pulled out of the module with a hook, thus freeing up a new module to accommodate more molten iron without having to shut down the furnace to wait for cooling. The efficiency of the furnace using this method is very high. In just half a day, more than 70 tons of iron bricks have been smelted. However, the energy consumed by the furnace was also astonishing. In just half a day, Rob had already poured more than a hundred first-level magic crystals into the furnace. With Rob's old metal and wood body, these magic crystals could last him more than ten years. If it were before, Rob would have probably stopped doing this kind of energy-intensive work, and seventy tons of iron bricks would be barely enough. But now that he has captured a magical multi-demon core creature like the Old Demon, and the newly harvested more than fifty pieces of fourth-level magic crystals, Rob is confident enough to continue to refine it for several hundred tons. No. 7 swung the drill bit, stabbing it accurately at the most vulnerable point, and large chunks of the river bed were lifted up by it. All over the body, only the joints and soul core, as well as drill bits and shovels are made of ferrous iron. The rest of the body is just ordinary steel, but this is enough. When Rob originally designed this six-legged construct, Sometimes, they are used as digging tools. They do not require high-intensity fighting, so they do not need a body that is too strong. At the beginning of Geracha, it was just a golden wood body, and she did not dig a hundred -meter escape channel. The current steel body is enough for No. 7. And the drill bit and blade are made of ferrous iron, which makes it even more powerful when digging. Once drilled, the river bed immediately collapsed. If it hadn¡¯t been for its soul¡¯s insufficient intelligence, Rob might have even equipped it with a razor blade. The No. 7 drill drilled toward the river bed, easily breaking through the surface layer and going deep inside. It was no different from the previous drill. Halfway through the drill, there was a sudden "ding" sound, a click sound, and the drill bit rotated at high speed. The drill was stuck and stopped, but the high-speed torque did not dissipate. It tilted No. 7's body to the side. After a few puffs, a stream of black smoke came out of No. 7's arm. The drill bit was broken. Hearing the abnormality of No. 7, No. 6 controlled by Rob ran over and saw that the joints were twisted and cracked. Rob held No. 7's drill bit, twisted it in the opposite direction, and pulled out of the ground. Upon inspection, he found that No. 7's entire arm was useless, and the entire transmission structure in the arm was twisted into a ball due to the reaction of the torsion. Twist, on the contrary, the drill bit itself is not too damaged, just a chip at the top. It can crack a drill bit made of Yantie and cause No. 7¡¯s arm to get stuck. It is definitely not an ordinary stone. Rob stopped the furnace temporarily, then summoned Gilasa to clear the area where the drill bit was stuck. The whole body of Jilasha is made of ferrous iron. The body is much tougher than No. 7. Even if it gets stuck, it will not be easily damaged. The drill bit first carefully drilled loose near the hole where No. 7 was stuck, and then the shovel scraped off the loose soil on the surface. After scraping off layer by layer, a pool of blue metal appeared in the ground. The metal has a perfect curvature, and it looks like it is not naturally formed. The metal itself has a dark pattern, which is very beautiful against the blue luster. Rob stepped forward and knocked. Ding, the metal made a very compact sound. Rob had never seen this kind of metal before. It was not like steel. It was very hard. Even a drill bit made of ferrous iron could snap. It was very hard. Probably higher than Yantie. Close your eyes and carefully examine the position where the drill bit is stuck. It is the edge of the metal. At this moment, a clear white mark appears there, but there is no trace of damage to the metal. The white mark is more like that left by the drill bit. Yan iron is almost the hardest and most malleable metal that Rob can find. If the hardness of the metal in front of him is higher than that of Yan iron, then what kind of metal is it? Before Jirasha could take action, Rob controlled No. 6 by himself and carefully drilled on the edge of the metal. The scope of the excavation was expanded bit by bit, and the loose soil was shoveled out layer by layer. The metal buried in the ground slowly revealed its full appearance, a semicircle that was half the height of Rob, with a piece of metal buckled underneath. A cylindrical metal bolt. Although the entire metal bolt has not been dug out yet, Rob is already sure what these things are. They are parts of an arm. ¡ In the laboratory, a six-meter-tall metal humanoid structure hangs on an all-steel shelf. Its proportions are not as stout as No. 5, but very slender, similar to the proportions of an average human body. Every part of the body is made very close to a normal human being. The fingers and toes are all available, and the joints fit together perfectly. If you see such a construct from a distance, it is difficult to tell the difference between it and a normal human being, except that it is larger. But when you look closer, the difference is huge. Just the blue luster on the body is obviously different from ordinary people. This steel structure has been buried under the iron river bed for who knows how many years. Now after it was taken out and the dirt was washed away, it turned out to be brand new and no different. There was no corrosion phenomenon caused by the metal being buried for too long. No scars can be found on the surface of the construct, not even the normal friction marks that metal should have. The surface of the machine body is polished to a matte state, and only when you get very close can you see the blue luster flowing on the surface. Such a construct is simply a work of art, a perfect display of exquisite craftsmanship. Even a senior constructor like Teddy Ross cannot achieve this kind of manufacturing precision.