Thinking about it, the rumbling sound around him sounded again, but Lin Mo did not act immediately, the failure of several previous attempts, and the black wave began to attack this illusory fortress again, made Lin Mo realize that he did not have much time.

There was no time to try too much, but Lin Mo had some guesses in his heart.

The Mirror of the Universe is associated with cause and effect, and the sigil of the cause and effect spell written on the Mirror has made this illusory fortress stronger and re-expanded.

Illustrates that the sigil of the causal spell has an effect.

But at this time, all the runes of the cause and effect spells that Lin Mo had mastered had been written, and it was useless to write repeatedly, which made him a little troubled.

It's useless to write, and if you don't write, it doesn't seem to work.

Although he didn't know what would happen to this illusory fortress after it was broken by that black wave, Lin Mo was sure that it would definitely not be a good thing for him.

"The runes have been written, these runes are already all the runes I have, the runes are useful, but looking at the current situation, it is obviously not enough, is there anything that the old man has not taught me?"

"No, I've read all the classics of the master's sect, as well as the ancient books that record these cause and effect spell sigils, that's all, no less."

Problems arise easily, but if you want to solve them, it is not so easy.

"Bang"

"Click"

Just when Lin Mo used all his brain cells to think about this matter, the black wave slapped on the illusory fortress again, this time the wave was higher and more powerful.

But there was still a rift on this illusory fortress.

The power of the black wave became more and more ferocious, and this illusory barrier obviously had no way to protect Lin Mo for a long time, Lin Mo understood that he couldn't exert any power at this time, and everything he originally relied on was just empty talk at this time.

If he wants to be safe in this place all the time, he can only rely on this illusory fortress, so that this fortress will continue to be strengthened and expanded, until the black wave is completely dispersed.

But if he wanted to strengthen this illusory fortress, Lin Mo had only one way, and that was to write the rune of the cause and effect spell on this huge mirror, and most importantly, it could not be repeated!

All the cause and effect spell sigils that have been mastered have already been written, and now if you want to continue writing, and you can't do the same as before, then there is only one way left - Lin Mo must create a new cause and effect spell sigil!

"These causal spells were originally comprehended by the predecessors, and then they were constantly improved, and they became these relatively subtle runes, but this is just the foundation, any spell is not used to apply a rune, but a combination of runes constructed with spiritual power, this is the essence of spells."

All the runes drawn before, in the cause and effect spell, can only be regarded as a foundation, and what Lin Mo has to do now is have two things.

The first thing is to use these sigils, through different combinations, to write spells on this mirror, that is, spell formulas from the sigils alone, which is like a mathematical problem, arranging and combining countless things, and matching the sigils together.

In the past, Lin Mo only knew what the rune was and how to use it, so that it could be turned into a spell, which was completely a way to read the book and use it directly.

Today's situation is different, Lin Mo needs to combine all these runes in turn through writing and pass them on to this mirror.

There are a lot of basic runes, but if you want to completely strengthen this illusory fortress, it is obviously not enough, but if these runes are combined, and the two runes are fused together to become a new rune, the number has already multiplied by a square multiple, and if it is three, the number will be multiplied by a cubic multiple.

In this way, when all the changes are completed, the new spell sigils formed can be combined again, and it can be called endless.

Lin Mo's eyes flashed with light, excitement arose, his sore arm had recovered, but there was motivation in his mind, and the whole person seemed to have a new life.

"Bang"

There was another loud bang, a spiderweb-like crack appeared on the illusory barrier, and the sound of shattering called Lin Mo back to his senses, he glanced at the illusory fortress that had been compressed to the extreme, and without hesitation, his hands began to dance again.

The end of one rune became the beginning of the next rune, and Lin Mo directly overlapped the two runes according to his previous thoughts.

A golden light shone, and the newly formed rune disappeared in an instant, blending into the mirror, and then appeared outside Lin Mo, flowing into the illusory barrier like a drop of water, becoming a part of it.

"It's done!"

Seeing the success, Lin Mo's joy could not be concealed, which already represented the success of his idea.

If such a rune is accepted, then the next thing will be simple, as long as Lin Mo draws, keeps drawing, and combines all the rune combinations, this illusory barrier, the illusory fortress will be strengthened without limit.

Lin Mo's hands waved, and his arms turned into afterimages again, and he began to write quickly.

One after another the recombined sigils flowed out from under Lin Mo's fingertips, and the pale golden light continued to shine, submerging into the mirror.

The illusory barrier that shrouded Lin Mo was also repairing little by little as the number of sigils increased.

Although the black wave outside the barrier was still surging, it did not make the barrier crack at all.

Thinking continued to run, more and more runes appeared, and with the shaking of the illusory barrier, the cracks that appeared on the barrier before disappeared completely, and a faint colorful light slowly emerged.

Lin Mo's movements were getting faster and faster, and the runes appeared faster and faster, with an excited figure on his face, the illusory barrier seemed to be standing in response to Lin Mo's mood, and the colorful light trembled slightly, becoming brighter and brighter.

More and more, more and more, and the illusory barrier was soon filled with pale golden sigils.

"Boom"

With a loud bang, the illusory barrier expanded in all directions again, this time with more strength than before, and this time the momentum was also extraordinary.

It's just that such a shock actually overturned the monstrous wave directly, but Lin Mo didn't seem to know anything about everything.

Everything around him is changing, Lin Mo is also changing, but he doesn't seem to have changed anything, his eyes slowly close, but his two hands have not stopped, and the speed of writing has not only not slowed down, but has become a little faster.

Five meters, ten meters, twenty meters...

The illusory space is getting bigger and bigger, and those pale golden runes seem to be the source of power for this illusory barrier, and with the increase of pale gold runes, this illusory barrier is slowly becoming full, and a majestic momentum is slowly accumulating.

At this time, Lin Mo's side became different again, originally it was just the arm that turned into an afterimage, but later, those afterimages turned into phantoms, and then they seemed to be condensed into substance.

As soon as the space turned, in this illusory barrier, several Lin Mo appeared at the same time, each facing one direction, they all closed their eyes, their fingers kept writing on the mirror, writing, still writing, their movements were fast, and faster and faster.

One, two, three, four...

There are more and more spaces in this illusory fortress, and there are more and more figures of Lin Mo inside, everyone looks like they are the same, but their movements are different, different sigils are formed from under their fingers, submerging into the mirror, and merging into the illusory barrier.

At this time, the illusory barrier can no longer be called an illusory barrier.

With the convergence of pale golden runes, this fortress has completely changed into another appearance, the accumulation of mountains and stones, turning the virtual into reality, and the illusory barriers, with the help of one rune after another, continue to solidify, turning into a mountain that exudes colorful light.

This mountain envelops all the forest ink in it, and with the drawing of the forest ink sigil, it continues to expand and grow taller.

"Bang"

There was another loud bang, but it was not the waves that crashed on this rune mountain, but the rune mountain pierced the sea, the top of the mountain had come to the sea, and a colorful light shone out, and in the dark world, light appeared, and this light was becoming intense...