When Lin Fei was trying to be in the Flame Hell, he had already reached the peak of the twelfth layer of the Qi Refining Period, and he had even obtained an Origin Fire like the Green Flame Fire, although the benefits were great, but it made it extremely difficult for him to break through to the Foundation Building Stage.

Now Lin Fei's purpose in coming to this underwater cave is to find another way, using the spiritual energy cultivation method of dual-line initiation, and trying to break through to the foundation building realm in one fell swoop!

In the previous life, Lin Fei and Gui Qianzang worked hard together to study the method of blending water and fire, although they did not achieve final success, but they simply stimulated each other with the spiritual energy of the two systems of water and fire, and a lot of methods were studied.

Lin Fei was now fused with the Blue Flame Fire, and it was too difficult to get this Origin Fire promoted, but it was relatively easy to cultivate the water system spiritual energy and break through to the foundation building stage in one fell swoop with the help of the Spirit Sea Yuan Sutra.

Once Lin Fei was promoted to the foundation building stage, it would definitely stimulate his attainments in the Great Sun Golden Crow Heart Sutra and accelerate his fusion with the Qing Yanhuo.

For people with insufficient qualifications, it is likely that they will not be able to pick up sesame seeds and lose watermelons, but Lin Fei's body has been transformed by nanoparticles, and it is really a simple thing for him to be a second-line initiate.

Only after breaking through to the foundation building period did Lin Fei have the means to use the scorched wood to refine the healing elixir to save Lao Guo's life, which was the real reason why Lin Fei was in a hurry to come out of retreat.

Of course, even if Lin Fei broke through to the foundation building period, he still had no way to take the Fire Essence Crystal, and it was impossible to refine it into his own natal magic weapon so quickly, unless Lin Fei's cultivation continued to improve, or if he completely mastered a kind of Origin Fire, he would have the means to refine the Fire Essence Crystal, but this was all for later, and now Lin Fei didn't need to be too anxious.

In a place like the Underwater Cave Mansion, it was naturally extremely suitable to cultivate the Spirit Sea Yuan Sutra, and at that moment, Lin Fei did not waste any time, and directly sat cross-legged on the spot, gathering the surrounding water system spiritual energy to help him cultivate.

Previously, Lin Fei had only tried to cultivate the Spirit Sea Yuan Sutra for one night, which could be regarded as laying a foundation for entry, but now the environment for retreat was just right, and with no scruples, he could naturally devote himself to cultivation with all his might.

With the help of the underwater environment, the spiritual energy of the water system is almost endless, and the Spirit Sea Yuan Sutra cultivated by Lin Fei is also the top technique of the water system, is there still a problem with using it to impact the foundation building period?

As time passed, the water-based spiritual energy in Lin Fei's body gathered more and more, further stimulating the fire-based spiritual energy stored in his body before, so that Lin Fei's strength had been steadily improving, and he was only one layer of window paper away from breaking through the foundation building period.

Unconsciously, the time came to May 3997 in the Kunlun calendar, and May 1 was supposed to be Lin Fei's sixteenth birthday, and according to the convention, a coming-of-age ceremony was to be held. But it's a pity that in order to cultivate, this memorable day passed quietly.

On this day, in Lin Fei's retreat in the underwater cave, the surroundings should have been silent, but suddenly the sound of waves sounded, and the sound of waves piled up under the layers, with more and more momentum!

The reason why there was a sound of waves was because the surrounding water system spiritual energy resonated with Lin Fei as the center, which was obviously a sign that Lin Fei was about to break through.

I saw Lin Fei, who had been sitting cross-legged, suddenly opened the storage bag and took out more than 100 spirit stones scattered around his body, and then he completely calmed down, silently guiding the spiritual energy to impact all parts of the body.

Cultivators who absorb spiritual energy for cultivation is a kind of evolution of their own body, and cultivators in the Qi refining period can transform spiritual energy into true qi and fill it with the meridians in their body, thus exerting a power far beyond that of mortals, which is equivalent to raising their lives to another level.

Breaking through from the Qi refining period to the foundation building period is an extremely important link in the path of cultivation, which is equivalent to another evolution of life. The true qi in the body of a cultivator in the foundation building period will condense and liquefy, so that the spiritual energy stored in the body is enough to multiply by as much as ten times, and the transformation of the body will be more thorough, and even the internal energy and external energy can resonate, so as to borrow the power of heaven and earth and use more amazing supernatural powers.

Whether it is controlling the magic weapon to attack in the air, or directly flying into the sky with the physical body, it is the most significant difference between the cultivators in the foundation building period and the cultivators in the qi refining period, and the difference is as big as the era of cold weapons entering the era of hot weapons.

It can be said that in this era of national cultivation, cultivators in the Qi refining period can only be regarded as mortals at the bottom, and only after the foundation is built can they be regarded as true cultivators!

After being reborn, Lin Fei was different from ordinary cultivators, his body was transformed by nanoparticles, so that every cell in his body could accommodate spiritual energy, and was not limited to the meridians, compared to normal cultivators, he could simply use the word "monster" to describe it!

Ordinary cultivators breaking through to the foundation building stage would certainly resonate with the spiritual energy of the outside world, but most of them were just mosquito-like humming, how could they make such a turbulent wave like Lin Fei?

The only explanation is that there is too much spiritual energy accumulated in Lin Fei's body, and the external energy attracted is naturally even more amazing, so that under the superposition of layers, this kind of movement does not seem to break through the foundation building period at all.

As for Lin Fei taking out more than a hundred spirit stones and scattering them around, this is also an indispensable step in cultivation, because once the breakthrough is successful, it is equivalent to the evolution of the body, and a large amount of spiritual energy is urgently needed.

Why can the spirit stone become the hard currency of the Kunlun Realm? It is really because this resource is too important for any cultivator.

Of course, if an ordinary cultivator breaks through to the foundation building period, at most ten spirit stones will be able to meet the energy needs, but Lin Fei is obviously different, so he will take out more than a hundred spirit stones and scatter them around, just in case of emergency.

At this time, the sound of the waves in the underwater cave has roared like a tsunami, which shows that the resonance between the spiritual energy has reached an extremely amazing level, if it is not controlled a little, I am afraid that under such an energy vibration, it is possible to collapse the entire underwater cave!

However, at this most critical juncture, the spiritual energy in Lin Fei's body also reached a perfect cycle with the momentum of water coming into being, and all the obstacles that Lin Fei felt when he was cultivating before rushed through, making the spiritual energy in Lin Fei's body flow freely like mercury!