Back in the courtyard, Xiang Fan laid out the materials one by one. The ground was covered with broken parts, looking like they had just been looted from a garbage dump. He squatted on the ground, studying the blueprint for a while, gently patted the core of the spiritual weapon, and muttered to himself, "Old friend, this time, let's see if you can save my face."

He carefully disassembled the spiritual weapon's core. The spiritual patterns along the cracks were distorted, like they were drawn by a drunk. Xiang Fan frowned and took out a carving knife. As he redrawn the spiritual pattern, he muttered, "Who made this? It's a disgrace to a weapon refiner. Even an amateur like me can't stand it." After carving, he slowly injected a trace of spiritual power. Finally, the spiritual weapon's core lit up with a faint blue light. He grinned, "Not bad. It's barely alive."

Then, he crouched beside the mech to repair the conductive wiring. The wiring was broken and tattered. Xiang Fan looked at the cracks and couldn't help but sigh, "Is this used for conduction? It's just a funnel. Can it even conduct spiritual energy?" His chisel moved swiftly, inserting spiritual pattern material into the broken wiring, repairing each one. During the test, spiritual energy flowed along the wiring, and the faint light points flowed like a stream. He patted the mech with satisfaction, "Alright, spiritual energy flows smoother than me climbing a mountain."

The armor repair process was more like a jigsaw puzzle. He used tools to cut the armor fragments into irregular shapes and pieced them together on the mecha's hull, giving it a new coat of armor like a patch. He patted the assembled armor, which made a dull "thump thump" sound, and nodded with satisfaction. "It looks like a pot of stewed iron, but at least it can still withstand a few hits."

Finally, he turned to the sensor. As he inserted the fragment of the aura mirror into the console, he grumbled, "It might be junk, but at least it's sharper than my eyesight." After connecting the wires, he tested the aura sensor with a tester. The response was even faster than he'd expected. He couldn't help but raise an eyebrow. "It's truly a prime piece of junk! This performance makes me wonder if it's a spy in disguise in the junkyard."

Working late into the night, Xiang Fan collapsed on the ground, exhausted, looking at the mecha's brand-new appearance. He reached out and patted the mecha's shell, his tone filled with pride: "It's a little ugly, but at least you look like a mecha now. Don't let me down, old friend. Tomorrow we'll see if you can move."

As night fell, Xiang Fan was the only figure in the courtyard, toiling away under the lamplight. The flickering light of the oil lamp illuminated his earnest expression, making it seem even more determined. His forehead was beaded with sweat, his fingers stained with spiritual pattern powder, making him look like he had just crawled out of a pile of flour. But his eyes sparkled with the excitement of a mechanical tinkerer.

The old mech stood quietly nearby. Though its shell was still battered and tattered, the faint glow and reconnected wiring seemed to announce that it was gradually coming back to life. Xiang Fan looked at the mech and smiled with pride. "It may look like a piece of iron, but at least it's somewhat presentable."

He sat cross-legged and carefully injected a trace of spiritual energy into the mecha's power core. A faint blue light flashed across the spiritual pattern lines, flowing like a stream. But within a few seconds, the blue light suddenly weakened at several nodes, and it seemed to be extinguishing.

"What's wrong with this?" Xiang Fan frowned, leaning in closer to examine the circuit. He quickly discovered the problem: some of the old spiritual pattern materials were too incompatible and simply unsuitable for the high-end quality of the mecha circuit.

He pinched his chin and pondered for a moment, like an inventor working late into the night, muttering to himself, "The spiritual patterns aren't compatible, maybe interlacing them would be better... After all, we just have to make do with each other, as long as it works."

He immediately took up his chisel and began redrawing the spiritual pattern onto the line. Each stroke was like embroidery, delicate and precise. Hours later, when the final stroke was placed, the blue light illuminated once more. This time, the light flowed smoothly, like a fluid tango within the mecha.

"It's done!" Xiang Fan couldn't help but cheer, patting the mecha's shell, and his palm suddenly felt a pain. "This piece of iron is so hard, it hurts so much..."

Next, he turned to debugging the control system. After inserting the fragment of the spiritual mirror into the core position, the light screen finally lit up. However, when he tried to control it, the system's response speed was as slow as if it were stuffed with dozens of tons of spiritual talismans.

"What's going on? Is this a slow-motion performance?" Xiang Fan couldn't help but complain, then realized the problem was the mismatched array patterns on the sensor's interface. He dug out spare materials from his storage bag and began to re-carve the interface array patterns, muttering, "A mismatched array pattern is like a shoe that doesn't fit. Do you think I'm modifying the shoe or the mecha?"

After completing the adjustments, he injected spiritual energy into the system again to test it. The control system finally ran smoothly, and the spiritual energy transmission speed increased significantly. He leaned against the mecha with satisfaction. "It's troublesome, but the effect is amazing. Sure enough, there are benefits to tinkering around."

Finally, Xiang Fan set about perfecting the mecha's defenses. He pieced together fragments of spirit stone armor onto the mecha's hull and painted defensive formations in key areas. The entire mecha resembled a patchwork suit of armor, both comical and majestic. Looking at his "masterpiece," he couldn't help but comment, "It's a bit artistic, but never mind the aesthetics; it just needs to block the spirit talisman cannons."

After completing this, he initiated a simple defensive test. A simulated talisman cannon blasted the mecha's hull, and the armor's surface flashed with light, successfully blocking the attack. Xiang Fan clapped his hands excitedly, but soon realized the weight of the armor was a problem. "While it can block the attack, I'm guessing it'll be slow enough to catch up to a turtle."

He patted the mecha and sighed, "Forget it, I'm fat, at least I'm safe. We can talk about losing weight later!"

Repairing the cracks in the energy core was the most difficult task, as he couldn't afford the standard tools available on the market. He could only use the crude tools he had made himself to repair the core surface bit by bit.

The tools in his hands made a harsh creaking sound, but Xiang Fan was completely focused, sweat beading on his forehead. He used fine spiritual pattern materials to fill the cracks, while carefully inspecting every seam.

"Although it's rough, as long as it can be restored to normal operation, it's fine." Xiang Fan breathed a sigh of relief and installed the repaired core back into the mecha.

As the test began, psychic energy slowly flowed through the core, and the mecha finally gained initial operational capabilities. Xiang Fan smiled and patted the mecha: "Next, it's the final adjustments and testing."

It was late at night, and the courtyard was completely silent, with only the mecha emitting a faint glow. Xiang Fan sat on the ground, looking up at the half-man-high mecha, his eyes filled with satisfaction and anticipation.

"There's still a little way to go, but it's almost there..." he murmured.