Previously blocked by silt, the cold air emitted by the cold iron veins was not very strong.

Zhang Qianren didn't care.

But the moment he broke through the mud and came to the range of the cold iron vein, the incomparable cold immediately invaded him.

Although the oval air shield formed by the water amulet kept the mud around him out, it could not stop the invasion of the cold air.

In the blink of an eye, a layer of frost formed on his eyebrows and the edges of his nostrils.

"Hiss~"

Zhang Qianren gasped from the cold, and hurriedly took out the Dan furnace in the storage ring, turned it into a half-human height and placed it beside him, and used up a talisman to seal the green flames.

As the Dan furnace emitted a wave of heat, he eased up.

In his divine sense, the mud under his feet was where the cold iron mine was.

But when he reached out to dig, he found that the mud under his feet was frozen like gold and iron by the cold air emitted by the cold iron veins.

In desperation, Zhang Qianren could only take out the shovel in the storage ring and laboriously dig up the ore in the mud under his feet.

At this moment, he suddenly recalled the years when he had just joined the Ethereal Sect and was sent to the mine to mine.

"I didn't expect that decades later, the old man would have such a day to return to his old business!"

Zhang Qianren shook his head and smiled bitterly, bowed his head and worked hard.

It was about half an hour before he finally dug up enough cold iron to make a furnace.

The cold aura of a single piece of cold iron ore was not strong, so he picked up a piece and used his divine sense to perceive it carefully.

"Sure enough, as the old man expected, this cold iron ore is not pure."

He sighed softly, and threw the cold iron ore in his hand, as well as the dozen or so cold iron ores scattered at his feet, into the Dan furnace, and while he took advantage of the Dan furnace to smelt those accumulations, he continued to wave the shovel towards the silt under his feet.

After a short time, the sediment in the cold iron ore and the sediment on the seabed were filtered out by the green flames.

Zhang Qianren took out those cold irons from the Dan furnace, and took advantage of the gap where the Ruyi Golden Hoop Rod began to devour, and also rested a little.

After the Ruyi Golden Hoop Stick had devoured more than half of the cold iron ore, he continued to dig with a shovel.

At the same time, Qin Mu was sitting at the head of the bed, looking at the history of this world.

He didn't copy the poems in his memory because the more than 100 poems had already hollowed him out.

At this time, he was looking at the first dynasty recorded in this world.

What made Qin Mu find it interesting was that this dynasty was actually named Qin.

Even many of the records are similar to the Great Qin Empire in his previous history.

For example, the emperor of the Great Qin Dynasty was also called Qin Shi Huang because he set the word emperor.

And...... II died.

It's just that this Qin Shi Huang did not have a son named Fusu and Hu Hai.

He was succeeded by his brother.

However, because this Qin II only cared about pleasure, he only reigned for 21 years, which led to the collapse of the Great Qin Dynasty, which unified Kyushu and the four seas, after only 471 years of existence.

After the fall of Great Qin, the world was divided, and the qi refiners also slowly rose at that time with the power of the heroes.

After tens of thousands of years, the first person to ascend to immortality appeared among the Qi Refiners.

After that, these Qi Refiners called themselves 'Immortal Cultivators'.

When Qin Muzheng saw this, a prompt sound suddenly sounded in his ears about the upgrade of the Ruyi Golden Hoop Stick.

"When you reach level 67 with your Wishful Golden Hoop Stick, you will receive +1 feedback on the Metallic Spirit Root, and you can choose who you want to give feedback to."

After he took the feedback and prepared to read it on.

But it didn't take long for another prompt to sound.

"When you reach level 68 of your Wishful Golden Hoop Stick, you will receive +1 feedback on the Metallic Spirit Root, and you can choose who to give feedback to."

After Qin Mu heard the prompt sound this time, he couldn't help but feel surprised.

Now that the experience of upgrading to a level of Ruyi Golden Hoop Stick is already 6800, it stands to reason that the upgrade speed should slow down.

How did he not even reach half an hour before he was promoted by two levels.

Intrigued, he opened the experience record and took a look.

Immediately, I saw a dense experience to get a record.

"Your wishful golden rod devours cold iron ore, experience +5!"

"Your wishful golden rod devours cold iron ore, experience +5!"

"Your wishful golden hoop rod devours cold iron concentrate, experience +50!"

"Your wishful golden rod devours cold iron ore, experience +5!"

Qin Mu saw the words experience +50 at a glance in a long column of records with experience +5.

"Cold iron concentrate?"

"This iron ore can actually bring 50 experience to the Ruyi Golden Hoop Rod?"

Surprised, he naturally noticed the brand-new ore 'Cold Iron Ore'.

Knowing that this time the upgrade was so fast because after devouring this cold iron ore, Qin Mu subconsciously rubbed his smooth chin.

"This person is in the Ethereal Sect, and he was able to obtain iron ore and heptane gold ore before, so he should have received the help of the sect."

"But the Dayu Imperial Court has restricted the trade of metals among the people, and even those sects can't mine privately, and even the entire Ethereal Sect has been taken away by the people of the Demon Suppression Division."

"How could he still find such a precious ore?"

"Could it really be that the person who got the Ruyi Golden Hoop Stick is actually a person of good fortune, just like what I made up?"

As he thought of this, the chime sounded again.

"When you reach level 69 of your Wishful Golden Hoop Stick, you will receive +1 feedback on the Metallic Spirit Root, and you can choose who to give feedback to."

After Qin Mu accepted this feedback, he suddenly wanted to know in his heart where the person who got the Ruyi Golden Hoop Stick found so many cold iron ores.

The thought only flashed in his mind, and an image suddenly appeared in front of his eyes.

Although it was dark in the picture, there was an undercurrent of "booming."

It was the first time that Qin Mu knew that the Ruyi Golden Hoop Stick was able to record the surrounding environment and broadcast it live to him. ’

His eyes widened in surprise.

Immediately afterward, he secretly guessed.

"Is this in the middle of the sea?"

"Or by the sea?"

While frowning, he glanced sideways out the window.

I saw that the sky had darkened, and a bright moon hung alone in the middle of the sky.

At this moment, a 'hey-yo', 'hey-yo' sound and the sound of gold and iron clashing suddenly sounded in the picture.

After hearing the old tone in the 'hey' voice, Qin Mu returned his attention to the picture in front of him.

When the sound of 'hey' gradually became more frequent, he couldn't help but squint his eyes and move slightly.

For some reason, he always felt that this voice seemed to be heard somewhere.

But for a moment, Qin Mu couldn't remember where he had heard this voice.

After a while, another chime sounded in my head.

"When your Ruyi Golden Hoop Rod reaches level 70, you will receive +1 feedback on the Metallic Spirit Root, and you can choose who to give feedback to."