He doesn't have much refined iron right now, so upgrading the Star Devourer's rank basically involves paying the blacksmith to provide the materials.

Senior Xu Wangshan had told him before that because of the malleability of Devouring Star, he could collect special ores for Devouring Star to use.

For example, the weapons Qingyan Tage and Zhu Fengwu are both made of special refined iron with fire attributes, and the swords made from them have a very good restraining effect on alien races.

Jiang Wuyuan looked at the entrance to the vein mine and felt a little tempted.

He carefully held the star-devouring object in his hand and stepped into the dark cave.

This was his first time going down into the mine. The strong smell of earth and ore hit him, making Jiang Wuyuan frown slightly, feeling a little uncomfortable.

The mine was poorly ventilated, so the smell was naturally a bit strange, but it became bearable after a while.

After walking along the tunnel for a few minutes, Jiang Wuyuan finally came across a piece of low-grade refined iron that had not yet been mined.

Like obsidian, it emits a faint fluorescence in the dark.

Adhering to the principle of not wasting anything, Jiang Wuyuan raised his hand and summoned his flying sword.

With a single sword-controlling technique, the low-grade refined iron on the mine wall was immediately mined clean, and Jiang Wuyuan stored it all into his spatial ring.

However, it's not over yet.

After a large amount of refined iron disappeared, Jiang Wuyuan saw the magical beast Mountain Crystal Treasure-Hunting Spider for the first time in the mine where a large pit had been dug out.

They feed on refined iron and live in vein mines year-round, posing one of the greatest dangers to those who go down into the mine.

Because this vein of minerals had been undiscovered for a long time, it had become home to many mountain crystal hunting spiders.

Just now, Jiang Wuyuan peeled off a layer of low-grade refined iron, revealing a dense swarm of spiders.

They have red bodies, eight slender legs, and eight eyes arranged in a row on their heads.

The bodies of countless treasure-hunting spiders piled together, emitting eerie cries.

This scene is truly pushing the limits of human tolerance.

But they are all low-level magical beasts and are not worth worrying about.

Jiang Wuyuan didn't even need to use the Star Devouring Technique; dozens of flying swords under his control went straight forward and wiped out the group of Treasure-Hunting Spiders.

Green blood sprayed out, and a foul stench spread from it.

The smell, mixed with the earthy odor of the mine, became even more unbearable.

But Jiang Wuyuan remained unfazed.

He picked up the blood crystal that had fallen to the ground, then turned and continued deeper into the mine.