Lu Qing felt that he had been away from his body for to long, and was about to reach his limit.

Originally, it would take a whole day and night to go back and forth to the water ghost lake. Lu Qing calculated the time and arrived on the eve of the battle. After watching the battle, he waited until Lu Chaoxi found the yin-essence water jade. It was time to go back, but after seeing the underground spiritual energy vein couldn't hold back, and went down to explore...

If you don't rely on karma to replenish it, you can't go back.

But fortunately, he didn't have to buy the expensive exchange item [Enlightenment Force]. Lu Qing still had more than 300 karma in his hand, which was enough for now.

So, after thinking for a while, he flew down trying to find the source of the spiritual energy vein.

The deeper he went the denser the spiritual essence got.

Lu Qing was a little surprised, but that was it. There are many places in this world that cannot be explained by the common sense of earth. With spiritual power, spiritual energy, and immortality, all kinds of magical things can happen.

He kept flying along the vein. After a whole day, he had to use the karma replenishment, but he still couldn't find where the source was. As he traveled down, the aura becomes more and more dense. After flying for a day, the water aura escaping from the spiritual vein almost reached the same level as a fourth-order spiritual vein. When Lu Qing was alive, the Yuyan Mountain he cultivated himself was only a fourth-order spiritual vein.

But despite this, he still didn't reach the source, and there is no new sign happening at all. The aura's intensity has been slowly increasing, and I don't know how deep underground this spiritual vein flows.

After thinking for a moment, Lu Qing had to stop.

He has to go back.

As a Golden Core monk before his death, he certainly didn't worry that he would get lost and find his way back. But after all, he is only a spiritual body now, and he cannot leave Yuyan Mountain for too long. If he is too far away, he will spend too much spiritual power for no reason.

He can only regret leaving.

He estimated the time and distance. It has been almost two days since he came out of the mountain. It is estimated that it will take at least two days to go back. It adds up to four days outside, costing him 14 karma...

But not too bad.

Not to mention the secrets in the depths of spiritual vein, just the current discovery is already a great fortune.

There must be some secrets hidden in the depths. Judging from Lu Qing's eyes, it is very likely to be an undeveloped and unknown cave.

If he could go on exploring, he will definitely be able to obtain huge benefits, even far more than a piece of yin-essence water jade. Moreover, Lu Qing believes that this piece of yin-essence water jade might have been formed by gradually leaching of of the spiritual vein over thousands of years.

He is very interested in this, if he was still alive, he will definitely continue to explore.

But the current Lu family obviously didn't have the capital to explore this secret land. Even if they explored it, they couldn't hold back such a large interest.

Not to mention the deeper part of spiritaul vein, even just the part he explored has a fourth-order spiritual vein in it.

Even if it's only the fourth-order spiritual vein, the current Lu Family wont be capable of keeping it.

It's better to let it be buried deep underground. In the future, the Lu family will become more prosperous and qualified to develop this secret, until then it will stay a secret.

However, even at the moment, there are ways to use this underground spiritual vein.

Lu Qing had already figured it out on the way back to Yuyan Mountain.

He has already ascertained the location of Lingxi in the ground. In the future, he can drill a well on the shore of the lake to connect to the underground river, and think of ways to draw water from it.

According to his estimation, when the time comes, next to the Lingjing, he will use the water he pumped up to practice. Even if the loss of water after leaving the Lingxi is included, it is at least equivalent to the effect of the second-order spiritual vein training.

Furthermore, the family has a deeper control over this spiritual vein. From its branch to the ground and infiltrating the lakeshore area, the time will be longer, and the family can have a real spiritual vein at a small price.

Spititual energy is an extremely important resource for cultivaters.

Cultivation requires spiritual energy. And the conventional way to obtain spiritual energy is either to refine it between heaven and earth, or to refine it from spiritual stones.

For a Qi training cultivater, at least one spiritual stone is required for one month of training. If you reach the seventh level or above, you will have two. This consumption standard is necessary to ensure that the progress of one's own cultivation is normal. If it is less than this number, let alone improvement, it is possible for the cultivation to regress.

Without using spiritual stones to practice, you can only refine the spiritual energy of heaven and earth.

Heaven and earth aura is everywhere, but it's not very strong in every place. In ordinary places, the refining speed is too slow to satisfy the cultivator.

Only spiritual veins can support cultivation.

The so-called spiritual channel is the place where the natural spiritual energy converges.

First-order spiritual veins are the most common, maybe there is one in a barren mountain. Many small families and casual cultivators have no choice but to find a place to be built as a cave and cultivate in it.

This kind of lowest level spiritual veins can only support the cultivation of cultivators in the Qi refining stage. If you want to reach the foundation building stage , you still need to use spiritual stones to fill in, at least ten in a month. More than a hundred spirit stones, the time stretched a little longer, and couldn't hold it at all.

So, the foundation-building cultivators had to find the second-order spiritual vein.

The general second-order spiritual veins can actually only support the cultivation of a few foundation-building cultivators. The specific ones depend on the quality of the spiritual veins themselves.

If it exceeds, the foundation-building cultivators will compete with each other for spiritual energy, and they will not cultivate well. After reaching the upper limit of the spiritual veins , at best, bring some other Qi training cultivators, and you can practice with the left overs.

When it's the Enlightenment stage, then a third-order Spiritual vein is needed.

But it's easier to destroy the spiritual veins, then to find one, and it's over if it blows up.

Yuyan Mountain used to be a Tier 4 spirit vein. In the battle that Zhao family came to the door, the core of the spirit vein was continuously bombarded by spells during the battle, causing considerable damage. It was reduced to Tier 2, but compared to other Tier 2 veins it's still top grade, so it can barely support the four foundation-building cultivators.

But nurturing it is to difficult.

For Yuyan Mountain to reach the third level, at least to invest of more than 50,000 spiritual stones will be needed.

But such a investment can never be aforted by the Lu clan, the only other way is to slowly raise it for at least a hundred years before it can reach tier 3.

It's expensive and time-consuming.

But high-level cultivaters must have a spiritual vein, otherwise, in the Enlightenment stage, the cost of spiritual stones for one year of cultivation will easily be one to two thousand. It's not a long time to practice on the Great Dao Road, and it's not unusual for a enlightenment stage cultivator to be in closed door cultivation for ten to twenty years. If there is no spiritual vein, one or two thousand spiritual stones will be spent every year in close door cultivation in the hopes of breaking through the realm. Even with the worth of a Enlightenment stage cultivator, he couldn't stand up to such a cost.

So a spitisual vein is almost a must for a cultivatore, let alone a family or sect.

Now, the Lu family is actually about to face this problem.

It was fine before Xue Ting reached the foundation building realm, but now, the family has four foundation-building and fifty Qi training cultivators, which have exceeded the limit of Yuyan Mountain's spiritual vein. The cultivation of family will definitely be affected. .

Before, Lu Qing was having a headache because of this, but now that he found this underground spiritual vein it solved many of his problems.

"Ready to open a base!"