After a period of alchemy, Lin Yuan's alchemy attainments have improved a lot.

That second-level spirit grass was enough for him to refine five pills.

After refining, he took a pill, sat down, ran the immortal cultivation method, and began to try to break through the bottleneck of the foundation building period.

As soon as he started, Lin Yuan discovered that the elixir refined with the second-level spirit grass was really extraordinary.

The aura in this elixir was not only larger, but also more refined, and the quality was much stronger than that of the elixir refined with first-grade spirit grass.

As soon as he absorbed it, Lin Yuan felt that the calmness of the foundation building period seemed to loosen a little!

However, after a while, it still can't break through!

It seems that the power of this elixir alone is not enough to help Lin Yuan break through!

So, following closely, Lin Yuan took out the medium-grade spirit stone again and put it in his mouth.

He had already tried it before, and the medium-grade spirit stone also helped to break through the bottleneck of the foundation building period, if it was used with a second-grade pill, he might be able to get better results, and even directly help him break through to the foundation building period!

After a while, Lin Yuan noticed that after adding the medium-grade spirit stone, the bottleneck in the foundation building period was indeed more loose!

It's a pity that it still can't be completely broken!

So then, Lin Yuan frowned, took out a snake gall bladder, and swallowed it in one gulp!

This snake gall is the snake gall in the body of the black python in the late stage of qi training, which contains very powerful power.

Lin Yuan had not been willing to use it before, just to wait until the critical time to use it.

After the power of the snake gall is added, the bottleneck in the foundation building period has really loosened more, and even there are already signs of crumbling!

Now, with only a trace of missing, Lin Yuan will be able to break through to the foundation building period!

However, it is this gap that is like an unbridgeable gap for Lin Yuan at this moment......

"Still can't work!" After trying for a while, Lin Yuan stood up with a frown.

He finally gave up.

This attempt still ended in failure.

The second-grade elixir, the medium-grade spirit stone, and the snake gall in the late stage of qi cultivation were still not enough to help him break through to the foundation building stage.

Now, he needs another opportunity!

Or rather, some external stimuli to stimulate his potential!

"External stimulus, it seems that we have to find some stimulus......" Lin Yuan frowned slightly, and said secretly in his heart, with a thoughtful look in his eyes.

Then, he took the three flat-headed brothers, got on the flying boat, turned into a blue streamer, left Lingshan, and went straight to the depths of the mountain range.

If you want to find excitement, you have to find a strong opponent and practice your hands!

This mountain range is very vast.

Perhaps, in the depths of this mountain range, Lin Yuan will be able to find a person to practice.

After leaving Lingshan, Lin Yuan and the three flat-headed brothers sat on the flying boat, constantly scanning the scenery in the mountain range.

After being strengthened by the mysterious pool, Lin Yuan's eyesight has now reached a very astonishing level, and he can penetrate many mountains with a big eye.

And those three flat-headed brothers are born with some special abilities, whether it is looking for spirit grass or demon beasts, they are all good hands.

It was precisely because of this that Lin Yuan came out this time and brought them up.

"Huh? That's ...... Pangolin!" Not long after flying, the white light flashed in Lin Yuan's eyes, and suddenly in the wall of a certain mountain, he saw a pangolin with a foot of three meters long.

It's a pity that this pangolin, with only a mere cultivation in the middle stage of Qi cultivation, can't be Lin Yuan's opponent at all, so Lin Yuan didn't bother to pay attention to it, and continued to urge the flying boat to fly forward.

Lin Yuan came out this time, and he needed to find some opponents who could fight him, or even threaten him!

At least it has to be a demon beast in the late stage of Qi training.

The demon beast with too poor strength can't have the purpose of practicing at all, and it can't give him any stimulation at all, it can only be a waste of his time.

"Well, yes...... What a big wild boar!" After flying for a while, Lin Yuan suddenly saw that in a small forest in a mountain col, there was a huge black wild boar six meters long, with a mouth full of sharp white fangs.

At this moment, this wild boar is eating a green python.

"Late stage of Qi training? Very good!Second Senior Brother, I'll use you to practice today!" After seeing the cultivation of the black wild boar, Lin Yuan couldn't help but show surprise in his eyes, and then he immediately urged the flying boat, turning into a blue streamer with an astonishing speed, and went straight to the grove below.

"Roar!"

At this moment, the black wild boar in the woods below also discovered Lin Yuan, an uninvited guest who had fallen from the sky, and immediately opened its mouth, revealing a mouth full of white fangs, and let out an angry roar.

As a powerful demon beast in the late stage of Qi training, this black wild boar has been the king and dominate this area for a long time.

This radius of more than ten miles is regarded as its own territory.

All the demon beasts that stepped into its territory basically became its blessed Chinese food.

Therefore, it was not afraid of Lin Yuan, who also only had a late stage of Qi cultivation, and even wanted to eat beef stew today!

As for that, following Lin Yuan, the three flat-headed brothers who came down from the blue flying boat were not taken seriously by the black boar at all.

It's just a demon beast in the middle of three mid-stage qi training, and it can easily bite and kill in minutes.

"Moo!"

At this moment, after Lin Yuan got down from the flying boat, he roared directly, and then rushed up with four hooves, directly hitting the black wild boar with his horns.

If he used a spirit weapon, he could easily kill this black pig demon.

However, he's here today for excitement.

Kill your opponent too quickly, and it won't do him any good.

He needed this boar to make him feel threatened, even his life!

"Roar!"

Seeing this, the black wild boar was not to be outdone, and with the same roar, the four hooves rushed up wildly, and directly stabbed Lin Yuan with the fangs in its mouth.

"Bang!"

A moment later, Lin Yuan collided with the black wild boar solidly!

As a result, Lin Yuan's bull head was stabbed by the fangs of the black wild boar, and a blood mark was removed, but it did not cause him multiple injuries.

And his hard bull's head directly shattered the fangs of the black boar!

At the same time, the terrifying bull energy all over his body directly knocked the black boar that was not strong enough to fly out dozens of meters away!

"Waste! give you a chance, you don't use it!" Seeing that the wild boar could not pose a threat to himself at all, Lin Yuan couldn't help frowning, and his eyes showed anger.

"Whew!"

The next moment, he suddenly took out the green flying sword, turned into an incomparably sharp green sword light, and directly cut the black boar that was still rolling in mid-air into two with a single sword!