After leaving the dining hall, Lei Yu returned to his residence. After today's scene in the dining hall, Lei Yu's determination to become stronger became even stronger. He needs more strength to improve his cultivation, so that he can win in the life and death platform half a year later.

The stream flows, the hut is tranquil, the wildflowers bloom, and the fragrance comes in, making it a complete paradise. It's just that at this time, Lei Yu didn't have the heart to appreciate it, but calmed down and cultivated, completely immersed in cultivation.

In the practice room, all sides are made of fine iron, which is very strong. Lei Yu was wearing a strong suit and sat cross-legged on the ground. He urged the magic trick, and there were five-colored rays of light flowing on his body, gold, blue, blue, red, and gray, and the five-colored light continued to flow, covering him perfectly.

He calmed down, immersed himself in cultivation, and was not aware of everything in the outside world. At this time, only himself was left in his heart, and everything else was left behind. The five elements of thunder energy continued to pour into his heavenly ** aperture, transforming into his own thunder power and consolidating his physical body.

There are thunder veins in the ground here, although they are small, they contain very strong thunder energy, which can be used for Lei Yu to cultivate. But as time passed, Lei Yu's speed of absorbing the surrounding thunder qi became faster, and the thunder qi supplied around him could not meet his needs at all. His heavenly ** aperture is like an endless black hole, continuously absorbing the surrounding thunder energy.

So much thunder qi gathered, but Lei Yu was not satisfied in the slightest. His appetite was huge, and the thunder around him was completely unable to satisfy him. If he continued to absorb it like this, the surrounding thunder energy would be completely absorbed by him sooner or later.

"No, the Five Elements Thunder Qi here is still too weak to reach the standard of the Five Elements Thunder Sutra cultivation at all. Lei Yu stopped his cultivation with a little frustration on his face. The cultivation he had just now was the "Five Elements Thunder Sutra" given to him by Elder Tongxuan, but the thunder energy required for this "Five Elements Thunder Sutra" was too much, making him a little unbearable.

"Five Elements Thunder Sutra", known as the cultivation to the extreme, can cultivate the Great Five Elements Thunder, this is more advanced than Zixiao Thunder, once practiced, with the unfathomable mystery of ghosts and gods. However, the cultivation of this "Five Elements Thunder Sutra" has a flaw, that is, it requires infinite Five Elements Thunder Qi, and the amount is amazing, and it is difficult for ordinary people to collect it all.

Since the battle between Lei Yu and Li Tiannian, Lei Yu has also been much clearer about his weaknesses. After all, "Aoki Thunder Jue" is too low-level and too weak, and it is not suitable for him at all.

In the battle with Li Tiannian, although Lei Yu relied on his strong origin thunder power to defeat Li Tiannian, it was only a narrow victory, and the main problem was that Aoki Lei was too weak to be of great use against Haoyang True Thunder.

Then, his gaze couldn't help but turn to the body of the "Five Elements Thunder Technique". This ** is advanced**, and the power is infinite, but the shortcomings are also obvious, that is, it needs enough five elements thunder qi, and this is what Lei Yu lacks.

The Five Elements Thunder Qi is simple to say, it is everywhere in the Thunder Continent, and it is very common. It's just that the five elements of thunder qi needed to cultivate the Five Elements Thunder Sutra are too terrifying, and even if Lei Yu completely absorbs the thunder vein he is in, I'm afraid he won't be able to advance one of the five elements thunder qi to a higher level.

Aoki Supreme Thunder, Golden Iron Qiankun Thunder, Heavenly Fire Black Plains Thunder, Clear Water and Blue Sky Thunder, and Thick Earth Boundless Thunder, these are all very powerful Qi Thunder. The thunder qi needed to form a kind of strange thunder made Lei Yu sigh, not to mention the five kinds of strange thunder, Lei Yu had a feeling of being overwhelmed.

"It seems that I still have to find the Five Elements Thunder Vein, otherwise, I won't be able to successfully evolve the Five Elements Thunder Seed at all. Lei Yu knew it in his heart, but he was not ready to give up, but wanted to find the thunder vein and gather the thunder qi, which could be used for the evolution of the five elements of thunder.

This plan is very huge, but with Lei Yu's current strength, it can't be completed, he just planned it, and he will talk about it later. It's just that there is a more important thing now, and that is to be promoted to the fourth order of thunder qi.

Thunder Qi Third Order, Lei Yu has stayed at this pass for a long time, and has reached the level of the peak of the Thunder Qi Third Order, and he is only one step away from breaking through to the Thunder Qi Fourth Order. Moreover, because of the battle between Lei Yu and Li Tiannian, his thunder power was refined to a pure point, and he could impact the fourth order of thunder qi.

A gray pouch appeared in Lei Yu's hand, and as soon as his mind moved, a piece of golden light emerged, and dozens of golden Lei Yuan stones appeared in front of Lei Yu. Some of these Thunder Source Stones were given to him by Elder Tongxuan, and some were the rewards he received when he entered the inner gate, and there were more than sixty of them.

As soon as so many Lei Yuan stones appeared, the practice room was suddenly full of golden light, surrounded by thunder energy, very full, Lei Yu felt a burst of comfort in his body when he took a sip, which made him enjoy it very much.

"These should be enough!" Lei Yu said secretly. After the Nine Shadows Body broke through, his Origin Thunder Power was much stronger than that of ordinary cultivators, but it also brought some difficulties, such as this advanced difficulty being one of them.

Lei Yu had tried to impact the fourth order of the Thunder Qi Stage many times, but they all failed due to the insufficient supply of thunder qi. And now, Lei Yu has made sufficient preparations, just to break through the fourth order of the Thunder Qi Stage with one blow and improve his cultivation again.

Secretly muttering to himself, Lei Yu took out a few medicine bottles from the space bag. These medicine bottles are filled with Lei Yuan Dan, which can replenish thunder qi. This is also Lei Yu's preparation when the thunder qi is insufficient, he has been frightened by the thunder power needed to break through the realm, and he cannot afford to lose.

"This time it has to be successful. Lei Yu said confidently, having made such full preparations, Lei Yu did not believe that he would fail, and was full of confidence.

Running the "Five Elements Thunder Sutra", thunder energy continued to gush out of the thunder source stone and rushed to Lei Yu's body. Suddenly, all kinds of thunder qi gathered on Lei Yu's body, and a strange color flashed on his body, and the colorful light was extremely gorgeous. It's just that Lei Yu didn't care about this, guiding these thunder qi into his body.

After all, the "Five Elements Thunder Sutra" is much more advanced than the "Aoki Thunder Jue", and the speed of absorbing thunder is much faster than that of the "Aoki Thunder Jue". Moreover, the thunder power consumed by the operation of the meridians has also been greatly reduced, and more thunder qi has poured into the heavenly aperture.

The Heavenly Aperture is correct, and all the thunder qi that enters the Heavenly Aperture is stored here, which is very huge. It is a bottomless pit, no matter how much thunder gas is filled, it will not cause any ripples, and it will never be filled.

The thunder qi runs in the heavens, and gradually transforms into pure thunder power and turns it into one's own use. Lei Yu felt that there was an explosive force gathering in the heavenly aperture, which was extremely vast, but Lei Yu didn't care about it at all.

More than sixty Thunder Source Stones supplied Thunder Feather, and thunder energy continued to pour out from the Thunder Source Stone, entering Lei Yu's body, and transforming into pure thunder power again, Lei Yu was waiting for an opportunity, an opportunity to break through the fourth order of the Thunder Qi Stage in one fell swoop.

The thunder is surging more and more, Rao is thunder source stone contains rich thunder energy, but it can't withstand the absorption of Lei Yu like this, and gradually the thunder source stone cracked, turned into mortal stone, and shattered into a piece on the ground.

In a short period of time, more than a dozen Lei Yuan Stones in front of Lei Yu had been shattered, and the thunder power gathered in his body had also reached a point of expansion, which was very terrifying. In this regard, Lei Yu ignored it completely, he continued to absorb it, and he wanted to completely absorb the thunder qi contained in these thunder source stones, leaving nothing behind.

Half an hour later, there were only more than thirty Lei Yuan Stones left in front of Lei Yu, and nearly half of them were consumed, all of which were stored in the Heavenly Aperture. And an hour later, the Thunder Source Stone in front of Lei Yu had completely become a fragment, all over the ground, and all the thunder qi was lost and entered Lei Yu's body.

Lei Yu was like a balloon about to explode at this time, as long as he touched it lightly, it would explode. His face was a little ugly, as if he had been propped up. It's no wonder that so much thunder energy has gathered in his body, and he also feels a little uncomfortable, but more of it is excited.

"Success or failure is here!" Lei Yu urged his own thunder power to rush towards the fourth acupoint, the rolling thunder power was incomparably immense, and he rushed to the fourth aperture on the edge of the heavenly ** aperture, and the impact was endless.

"Boom, boom!" waves came, and the fourth ** trick was buzzed, as if it was about to break through. So much thunder surged at once, like a monstrous flood, with boundless momentum, under the full impact, it was difficult for anything to resist.

Lei Yu mobilized the thunder power of his whole body to impact the fourth ** trick, and he had already pressed all the energy of his body on it, and he couldn't afford to miss. The thunder power was vast and endless, and the power of more than sixty thunder source stones was exerted to the limit at this moment, as if it was about to explode in his body.

Lei Yu tried his best to control it, and used all these forces to bombard the fourth ** trick. Each bombardment will have a very big impact on the fourth ** point. The fourth ** trick is crumbling, and there is a danger of being blasted open at any time, but whenever Lei Yu thinks that the fourth ** trick is about to be broken, there is a huge force that blocks it and cannot be broken.

Lei Yu calmed down, responded calmly, and urged Lei Li to bombard the fourth ** trick even more frantically.

A stick of incense, half an hour, an hour, two hours, Lei Yu bombarded with all his might, he was almost exhausted, and the thunder power contained in his body was about to be exhausted. He had run out of oil, but the portal of the fourth ** trick was about to open, and he was only one step away.

"I didn't expect so much thunder to be needed. Lei Yu smiled bitterly, but he poured out a few white pills from the medicine bottle, and there was a medicinal fragrance that rushed out, with extremely strong thunder power.

Lei Yuan Dan contains powerful thunder energy, which can replenish the thunder power consumed by cultivators.

Lei Yu couldn't care about anything else, so he swallowed these Lei Yuan Dan. Suddenly, a thunderous force emanated from the elixir, which was very strong, and then rushed towards his heavenly ** aperture.

Lei Yuandan's medicinal power was revealed, and such a new force was added. Lei Yu once again gathered the thunder power of his whole body and launched a fierce attack on the fourth ** aperture.

"Boom!" The thunder was surging, and the attack launched was also overwhelming, just one blow, and the fourth ** trick was opened to communicate thunder. Suddenly, Lei Yu felt a burst of relief, and a new thunder qi entered his body, he only felt that his fatigue was much less, and his spirit had recovered a lot, and he officially became a fourth-order thunder qi cultivator.