Regarding the secrets of the cosmic starry sky cage, Lin Fei knew something.

Therefore, when the black-haired boy said these things, Lin Fei was not surprised at all.

And when the prison clan was mentioned, Lin Fei showed a hint of surprise.

What surprised Lin Fei even more was that the earth once again became the focus.

"What race are the Prison Clan? Why is it on Earth? ”

saw the black-haired boy smile slightly.

"The question of the free gift has been answered, no other questions can be commented!"

Lin Fei frowned when he heard this.

After working for a long time, the thing left by this martial ancestor was a answering machine similar to 100,000 whys.

This made Lin Fei a little unbelievable.

"So how do I get the chance to ask questions?"

The black-haired boy's face turned amiable this time.

"That's a good question, and I can answer it for you for free! You only need the four secret realms of wind, rain, thunder and sky, a total of thirty-six spaces, and every time you break through a layer of space, you can get a chance to ask a question! ”

As soon as he finished speaking, the black-haired boy turned into a puff of smoke and disappeared without a trace.

"Coming and going without a trace? Even the big octopus is gone......"

Lin Fei's soul swept away, and the entire space was empty, where was there still the shadow of a big octopus.

With the disappearance of the Great Octopus, the third layer of the Thunder Secret Realm became empty.

This time, Lin Fei ascended the Triple Thunder Mountain and became unhindered!

The thunder and lightning continuously released on the Thunder Mountain also weakened Lin Fei's oppression and attack a lot!

Soon, Lin Fei climbed the Triple Thunder Mountain!

As before, the Void Portal to the 4th Layer of Space has quietly appeared!

Lin Fei slowly stepped into the Void Portal, and in the next moment, he entered the 4th layer of space!

When I entered the 4th floor, I saw that the world had changed dramatically!

It is no longer as desolate as the first three floors of space, but everywhere the grass grows and warblers fly, full of all kinds of rare plants, birds, animals, flowers, birds, insects and fish, it is simply a paradise!

Above the sky, it is like a sapphire, crystal clear!

"This is the 4th layer of the Thunder Secret Realm, is this a 4-star rune?"

Lin Fei stretched out his hand, and a ball of lightning appeared in his palm!

This is a rune-shaped lightning bolt, which began to struggle continuously after appearing in Lin Fei's hand, and it seems to have spirituality.

"The structure of this four-star rune is too complicated, and it seems that the knowledge of basic rune introduction is completely insufficient! I can't read the proof rune at all! ”

Lin Fei at this moment, just like a primary school student who has just learned addition, subtraction, multiplication and division, to show him a college advanced function problem, it is naturally like reading a book from heaven!

This four-star rune, although it is only one level more than the three-star rune!

But its principle and structure have indeed changed dramatically!

At the level below the three-star rune, the rune is two-dimensional, and it can be parsed on a flat surface!

And the four-star rune, the five-star rune and the six-star rune, this is a three-dimensional rune, and the amount of information contained in the rune itself has an extra dimension!

In addition, the principle and basic score of the three-dimensional rune structure are completely different, and it contains the trajectory of the operation of the laws of the universe!

Therefore, in order to understand the four-star runes, you must have a certain understanding of the laws of the universe, at least be able to see the trajectory of the laws of the universe!

Fortunately, Lin Fei's eyes have changed now, and it is not a problem to see the trajectory of the laws of the universe!

But this didn't mean that Lin Fei could understand the four-star runes!

It's like you can see an apple fall to the ground and understand that it is the effect of gravity, but you may not be able to understand the formula of gravity!

That's the difference between knowing what it is and knowing why it is!

"Since you can't understand it, let's take a closer look first, it shouldn't be too difficult to copy it!"

"I have a rune world, and if you want to simulate a four-star rune, you don't necessarily have to understand it, you just need to be able to draw it!"

Lin Fei's mind moved, and the rune world began to condense a four-star thunder rune prototype!

However, before this four-star thunder rune could take shape, it collapsed directly!

"Alas! Still failed! But don't worry! I can keep trying! ”

Lin Fei made persistent efforts and began to continue trying to condense the four-star thunder rune!

The four-star thunder runes in the rune world continue to evolve!

In the outside world, Lin Fei continues to explore the fourth dimension!

In this fourth space, there is a scene of birds singing and flowers, and the scene of paradise.

There are no thunderbeasts to be seen.

I've been looking for a long time.

Lin Fei finally found the Thunder Mountain in this fourth space.

"Finally found the Quadruple Thunder Mountain!"

In between, a thunder mountain was suspended in the void.

This Thunder Mountain, like a suspended island, is made of jet-black rocks.

There was a constant roar of thunder, striking on the suspended thunder mountain.

At the moment when Lin Fei approached Thunder Mountain, the originally silent world suddenly became noisy.

In the surrounding void, strange beasts continue to appear.

These strange beasts appeared without warning.

After suddenly appearing, he directly attacked Lin Fei.

"I'll go! The strange beasts that appear here are all legendary! ”

As far as the eye can see, there are no less than thirty legendary-level beasts.

Each Legendary Beast is as tall as a giant mountain.

"The alien beasts here are no longer limited to thunder beasts! It seems that, like that Zhangzhang Star Beast, they all have an independent soul consciousness! ”

These strange beasts are no different from the real strange beasts in the outside world.

However, Lin Fei felt a little weird.

"Could it be, the strange beasts here are all fake? It's all transfiguration, right? ”

Lin Fei conjured up a thunder knife in his hand and swung it out.

The sword tore through the void, and after mixing with the power of thunder, it directly tore a strange beast in front of him in half.

At this time, Lin Fei carefully observed the changes in the system.

"There is no change in the phylogenetic value, the alien beasts here are all fake!"

At that moment, Lin Fei seemed to understand something.

"Butterflies can't turn into caterpillars anymore! These are just fake shells, not real legendary beasts! ”

With an understanding in his heart, Lin Fei quickly made a decision.

With a movement of his mind, the three-star thunder rune condensed a thunder enchantment, sheltering his body in it.

Then, cast a thunderbolt.

In the next moment, Lin Fei's body turned into a flash of lightning and went straight to the Levitating Thunder Mountain.

Then, those legendary beasts followed behind, chasing after them.

Fortunately, Lin Fei's thunder escape technique was extremely fast, and Rao was chased by these strange beasts, but he didn't catch up.

Wait for Lin Fei to step on the top of the Quadruple Thunder Mountain.

All these chasing beasts disappeared one after another.

Sure enough, the rules haven't changed! As soon as I set foot on the top of Thunder Mountain, these strange beasts will disappear! ”

"Now, shouldn't I ask the fourth question?"

Lin Fei looked around, but he didn't see the black-haired boy.

At this time, a number appeared in the void.

"Thirty-six!"

That huge number was suspended above the Thunder Mountain.

Let Lin Fei look at it for a long time, and he didn't know why.

"Could it be that the number thirty-six has something to do with the portal to the fifth dimension?"

"Could it be that I was asked to kill thirty-six legendary beasts?"

Lin Fei's eyes widened suddenly, and a guess came to mind in his heart.