The cave was very dim, but Su Yi's cat pupils were very suitable for the night, although it did not reach the level of seeing the night as day, but he could see things clearly.

The cave is long and cluttered.

It looks like it's not just a spirit stone mine, it's also the thunder bear's lair.

Walking to the middle, Su Yi saw a few crystal clear stones, looking at the color, there was not much difference between them and those taken out by Lei Xiong before, but the size was very different.

When I got closer, I suddenly felt the aura come alive.

"Is this the spirit stone?" Su Yi looked at the stone and said in his heart.

After counting, there are about eleven spirit stones, but the aura is uneven, and it has obviously not been professionally corrected.

"Also, this is a spirit stone mine, and it is estimated that only some untreated raw ore can be mined. ”

After a moment of silence, Su Yi placed the spirit stone around him and began to cultivate.

In the past, when he cultivated, he extracted energy directly from food and refined qi.

However, in the process of practicing, I will occasionally swallow some of the surrounding aura and integrate it into my body.

And now, although it is still the same action, because of those spirit stones, the surrounding aura has increased significantly, and the efficiency has suddenly improved.

Su Yi tried it, and basically the closer the spirit stone was to Su Yi himself, the higher the efficiency of absorbing the spiritual energy.

From this point of view, the best way to absorb the spirit stone is to swallow the spirit stone.

However, considering the material of the spirit stone in front of you, and the size of your fist......

Su Yi gave up this choice.

Su Yi picked up a spirit stone and tried to use his true qi to channel the aura inside.

After trying it a few times, the aura was exported by Su Yi, and after some of it escaped, most of the remaining true qi was inhaled into Su Yi's body and replenished into his body.

The true qi in his body has recovered a lot—this is the true qi he fought before.

It is said that human beings have a spirit gathering array that specially guides the aura in the spirit stone, but I don't know if it is a similar principle.

Su Yi just tasted it, then put those spirit stones into the storage bag and continued to move forward.

He didn't know how many spirit stones he needed to advance, but he thought about it, the more the better.

Su Yi didn't want to encounter the dilemma of insufficient spirit stones at a critical moment.

He moved on.

This is a mine cave, but it is said to be a mine cave, in fact, looking at the claw marks around, Su Yi feels that this is more like a bear hole dug by Lei Xiong himself.

The height is relatively high, but this mine is just a straight road directly into the mountain, and there are various gravel walking around.

Su Yi had never been to the mine in his previous life, but thinking about it, there shouldn't be a worse mine.

"The Immortal Cultivator's mine should be much stronger than this. Su Yi looked around and was speechless.

The scientific and technological level and humanistic system of the demon clan are too far and far worse than that of human beings.

Like this mine - is there normally a mine that leads to the end?

Shouldn't there be a few more branching routes?

Forget it, I'm just going to give it a try anyway.

Su Yi walked all the way to the end, and in the deepest part, he found some spirit stones that had not been completely stripped from the mountain wall.

"Let's start digging spirit stones!" Su Yi revealed his glittering claws.

Miner cat Su Yi is online!

......

Su Yi started mining, mining experience +1......

Ahem, well, the above is a joke, in fact the mine is not that easy to dig.

It is not difficult to dig out the spirit stone, but the spirit stone is also a stone, although the hardness is a little higher, but it is also easy to destroy.

So this requires him to be extra careful.

It took Su Yi about ten minutes, using his claws to peel off the surrounding dirt little by little, before digging out a spirit stone from the mountain wall.

This was still the case when he had already discovered the spirit stone.

"It's a little slow......" Su Yi squinted his eyes and said secretly in his heart.

Normal digging spirit stone must be digging the spirit stone completely embedded in the mountain stone, you need to lock the spirit stone, dig up the surrounding soil, if it is far away from the spirit stone, you also need to dig out a passage close to the spirit stone......

As an existence that is about to be promoted to a demon, he also has some perception of aura, and he can roughly lock the location of the spirit stone within ten meters.

If you are far away from the spirit stone, you can exert more strength, and you can dig carefully near the spirit stone.

But it's also a lot more troublesome, far more troublesome than digging a cave.

"If you're unlucky, you may not be able to dig up a spirit stone ......in three or four hours," Su Yi sensed the situation of the surrounding spirit stone divisions, and calculated in his heart.

The density of the spirit stones here was very small, and Su Yi only felt the existence of one spirit stone.

If you want to get more spirit stones, you need to dig deeper and farther.

If you're unlucky, you might not even be able to touch the spirit stone all the time.

What Su Yi didn't know was that this spirit stone mine could not actually be regarded as a spirit stone mine.

The density of spirit stones is too low, and the efficiency of producing spirit stones is far lower than that of authentic spirit stone mines, so the powerful forces can't look down on it, so it fell into the hands of the Thunder Bear clan.

Of course, it can still produce a few spirit stones, at least enough for the cultivation of a monster-level demon clan.

"If you want to advance, you can't miss the spirit stones, although I don't know how many you need, but it's best to prepare more than twenty. ”

"No, it's better to prepare a little more, the Thunder Bear clan doesn't know when they will find me, the sooner the better......"

Su Yi squinted his eyes, his method of digging a pit obviously would not be a human method.

Human monks mine, there are props that specifically lock the spirit stone, and there are spirit manuscripts with various spells attached, and the speed is not slow.

Of course, the demon clan is not slow.

Unlike humans, who are not naturally good at digging holes, there are many races of demons who have 'burrowing' skills.

Su Yi also has a lv1 burrowing skill, which is no less efficient than human monk mining.

But helplessly, the big forces are mining, and they all start work together in a group of people, but Su Yi only has himself.

Even if you don't count the gap between the spirit stone mines, there is also a considerable difference in the efficiency of the two sides.

After a moment of silence, Su Yi said, "Upgrade, dig a hole!"

Consumes 10 evolution points, digging Lv1 → Digging Lv2.

Consume 100 evolution points, digging lv2 → digging lox3.

Now Su Yi has no evolution points, but what is lacking is true qi!

Even if it is a burrowing skill that is rarely used, he can invest 100 evolution points without care!

"Then, let's get started!" Su Yi smiled.

......

With the Lv3 burrowing skill, Su Yi's efficiency almost tripled.

At the same time, he also called Bai Fei outside the cave and asked her to bring her clansmen over to mine together.

Rabbits also have a talent for mining, and digging spirit stones is not difficult for them.

Of course, the speed is incomparable to Su Yi.

When the Cloud Rabbit clan saw the thunder bear that fell outside the cave, they were so frightened that their little hearts were about to jump out.

That's a high-level demon clan!

Kill him, and the Thunder Bear will definitely be looking for trouble!

However, after killing Thunder Bear, Su Yi's majesty also increased a lot, and after looking at them with a cold face, the rabbits suddenly got a 'fear' buff, and the mining efficiency was greatly improved.

With the efforts of more than a dozen rabbits and Su Yi, who had upgraded his skills, a day and a half later, Su Yi finally got his goal together.

Twenty spirit stones lay there quietly, and there were a few spirit fruits stored by the thunder bear around them.

"It should be almost......" Su Yi squinted his eyes and said secretly in his heart.

He then banished the rabbits from the mine.

There is a lot of aura here, and he is ready to ...... here

Promotion!

......