Chapter 315 Control Rune.

Inside Tianji Fortress, at the core of the fortress formation.

Cao Rui stood among them, his eyes attracted by the countless circles entwining around him, and he couldn't help but feel dazzled.

He exclaimed: "It's really terrible!"

He secretly speculated in his heart what level Tianjizi's formation attainments had reached.

At this moment, the core of the formation he saw in front of him was a huge sphere with a diameter of about ten feet.

This sphere is the core of the Tianji Fortress. It floats quietly in this space, constantly emitting various signals and energy, thereby accurately controlling the operation of the entire Tianji Fortress.

The arrays on the surface of the sphere are densely packed and intertwined, one after another, like a complex maze.

For outsiders, if they don't get any guidance, it's almost impossible to figure out how these magic circles work.

Baby Tianji flashed and came to the ball. He pointed at one of the areas and said, "This is the central control function of Tianji Fortress."

Then, he continued to explain: "If you want to change it, you must erase this magic circle, but at the same time, it cannot affect the normal operation of other parts of Tianji Fortress."

Cao Rui nodded slightly to express his understanding, and then stared closely at the extremely complex magic circle ball in front of him, observing it carefully for a long time.

After a while, he slowly said: "Then can I completely erase it and then rebuild it?"

Hearing this, Baby Tianji couldn't help but be stunned for a moment, and then exclaimed:

"Have you seen its size, and the number of magic circles it covers is extremely terrifying!"

"The fortress's ability to transform, absorb the spiritual energy of heaven and earth, and randomly teleport, etc. all require complex formation skills to create, but the control center is relatively simple!"

"But..." Tianji Baby changed the subject: "If anyone else had said that, I would definitely think he was crazy."

"But for a rune genius like you, it may be possible. It's just that this task is too difficult and requires a lot of time and energy."

"It took my father hundreds of years to refine the Tianji Fortress back then, and the renovation took longer than the new construction. So I think that by the time you complete the renovation, a long time has passed, and the demon invasion will not wait for you. , by the time you finish everything, the day lily will be cold."

After hearing this, Cao Rui nodded thoughtfully and said softly: "That's true."

"Just take it step by step."

"Baby Tianji, please help me formulate a plan first, select the magic circle runes to be changed in the first step, and gain control of the Tianji Fortress as the main task."

"Understood."

Baby Tianji started his brain and began to analyze the magic circle on the ball.

The main thing is to distinguish which part can be erased and which part can be superimposed and inscribed.

Three days later, Baby Tianji felt dizzy.

"Cao Rui, it's too difficult. There's no way to start. Many of the runes in the control center are integrated with other runes, basically affecting the whole body." Baby Tianji said.

Cao Rui looked at the modified plan drawn by Tianji Baby. With his knowledge of formations, he could naturally understand Tianji Baby's thinking.

After thinking for a while, Cao Rui pointed to several rune formations and said, "We can abandon the levels in Tianji Fortress."

Cao Rui has already obtained everything in the level, so it doesn't matter if he gives up.

The space in the level is freed up, and you can keep it for other purposes later when your magic circle attainments improve.

In fact, a large part of the runes in dozens of levels have expired because the level rewards have been exhausted.

The few remaining ones are nothing more than jade slips.

After Tianji Baby heard this, his eyes lit up and he continued to analyze the ball.

Cao Rui's decision greatly reduces the difficulty of changing the control runes of the running core.

After all, there are more than thirty levels, and there are too many runes intertwined with each other on the ball. Looking forward and backward, you will inevitably feel like you have no idea where to start.

This time, it only took half a day.

Tianji Baby completed the analysis and created a new plan.

Of course, Cao Rui has not been idle during this period, and has been practicing the knowledge of magic circle runes given by Tianji Baby.

Only after using experience beads to upgrade them to the perfect level can Cao Rui start the formal changes.

"Cao Rui, look." Tianji Baby handed the plan to Cao Rui.

"The formation here is the control rune of Tianji Fortress. It is composed of three fifth-level runes. You erase them all, and then construct the control rune in the same way. You only need to change these few points. ..., you can control the entire Tianji Fortress.”

With the help of Tianji Baobao, the traitor, Cao Rui's process of controlling Tianji Fortress became much smoother.

"I understand." Cao Rui nodded slightly.

"However, after such erasure, the most core level-breaking function of Tianji Fortress will really disappear. This is almost the same as erasing all the magic circle runes on the core." Baby Tianji sighed.

When Tianjizi built Tianji Fortress, the main purpose was to break through the barrier and find the successor.

Cao Rui spread his hands: "There is nothing we can do about this. Does the fortress's thirteen-state teleportation function still exist?"

Cao Rui asked.

"I haven't touched these runes for the teleportation function. If nothing else, they should be retained." Baby Tianji said.

Cao Rui nodded slightly, that would be no problem.

"Before I erase the control runes, I have to understand them."

Cao Rui took the crystal plate and began to copy the three fifth-order runes that Tianji Baby pointed out on the sphere, the control runes.

Although Tianji Baby knew about this control rune in his mind, he was not proficient in it.

Therefore, he could not engrave it on behalf of Cao Rui.

Cao Rui could only rely on the experience beads to slowly practice, improve it to the perfect level, and then engrave it himself.

This practice took more than half a year.

Even with the experience beads, Cao Rui had plenty of rune experience.

But the control rune created by Tianjizi, which could control this huge space, was still too difficult.

It took Cao Rui three months to condense the experience beads of the control rune.

After condensing the experience beads, it was a little easier.

Twenty days to get started, one month to achieve minor success, and forty days to achieve major success.

Two months to complete.

For a full eight months, Cao Rui engraved this control rune for eleven hours out of twelve hours every day, and finally cultivated it to the perfect state.

While Cao Rui was practicing, Tianji Baby was teleported back to the Spirit Beast Sect and continued to refine the Lingyin Jade Pendant for Cao Rui, in order to give each Yunzhou cultivator a Lingyin Jade Pendant as soon as possible.

"The control rune has been completed. Next, I will erase the control rune on the Tianji Fortress and engrave my own." Cao Rui's eyes flickered.

After completing the control rune, the experience memory in his mind made Cao Rui understand it clearly.

He also thoroughly understood the principle of Tianjizi's fusion of runes to create such a powerful control rune and the principle of setting control rights.

Cao Rui also had some ideas about the changes to the control rune on the Tianji Fortress, and decided to take the opportunity to add some of his own ideas to completely build the Tianji Fortress into the core tool of his future mysterious organization in the world of immortal cultivation.

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