I can gather experience beads

"Tell me what your plans are next." Wu Qingxuan readily accepted the storage bag containing 10,000 spirit stones and spoke.

Cao Rui said, "Based on the sales volume of the Lingyin Jade Pendant in Qingling Market, I think the time to deploy the signal tower has almost arrived."

"It's time to refine the signal tower and spread the signal of the Lingyin Jade Pendant throughout the southwest of Yunzhou."

"Next, I hope that you, Master Wu, can help me refine the signal tower."

Wu Qingxuan nodded, "No problem."

"But the signal tower is a first-level magical tool after all. Including me, there are only seven or eight people in the weapon refining academy who can refine a signal tower."

Cao Rui heard this and said, "It's not a first-level magic tool, but a second-level magic tool."

"A second-level magical tool?" Wu Qingxuan was surprised when he heard that.

"Second-level magic tool, are you sure you have so many spiritual pattern crystals to use?"

For a second-level signal tower, the amount of spiritual pattern crystals required will increase several times. One signal tower will require at least several hundred kilograms of spiritual pattern crystals.

Cao Rui glanced at the spiritual pattern crystal in the storage bag and nodded: "It's enough. If it is arranged into a second-level signal tower, the transmission distance of the signal tower will be longer, and the number of signal towers can be reduced accordingly."

If thousands of signal towers were deployed as before, it would be difficult to deal with human damage, and it would not be in line with Cao Rui's plan.

There is no shortage of independent cultivators or evil cultivators who do bad things in the world of immortal cultivation.

Cao Rui is not planning to deploy signal towers in all areas.

In Cao Rui's vision, signal towers will be distributed linearly in all places in the southwest of Yunzhou where signals are necessary.

Then, according to their own plans, they formed interest relationships with local cultivation forces.

They were given the right to top up, and every Lingyin point they sold could earn them 10% to 20% of the profit...

No one would refuse a free lunch that falls from the sky.

Moreover, in previous lives, mobile communications were unable to reach some remote areas, but that did not prevent people from using mobile communications.

Because people will never go to those remote areas, and even if they go, they will be mentally prepared in advance.

For the world of immortal cultivation, this is a much easier problem to solve.

Apart from connecting areas where immortal cultivators are active, such as markets, sects, immortal cultivation families, ruins and spiritual places, there is no need to build signal towers in other areas where mortals live.

Most immortal cultivators will also take the initiative to avoid the mortal world where spiritual energy is thin.

In this way, coupled with the upgrade of signal tower level, the number of signal towers required by Cao Rui will be greatly reduced.

Cao Rui made a rough estimate and found that according to this method, the number of second-order signal towers needed to connect the entire southwestern immortal cultivation forces of Yunzhou would be less than a hundred.

If the signal towers are refined to be better, even fewer signal towers will be needed.

"The cost of a second-level signal tower is around three thousand spirit stones. It will cost three hundred thousand spirit stones to deploy one hundred second-level signal towers."

"It seems like a huge expense, but the investment is totally worth it, and half of the cost is on the spiritual pattern crystal. The actual number of spiritual stones required will be less." Cao Rui estimated in his mind.

After pacing back and forth for a while, Wu Qingxuan said, "According to your plan, the second-level signal tower can be engraved with the second-level [Remote Transmission]. I haven't fully mastered the second-level [Remote Transmission]. It will take time for me to master this array."

"Moreover, the refining of the second-level signal tower requires a cultivator in the foundation-building stage. I am afraid that I am the only one in the entire refining institute who can help you refine it."

Cao Rui nodded and said, "After returning from this trip, I will retreat with you, Master Wu, to refine weapons and learn magic arrays."

Wu Qingxuan said, "Since you have this intention, I am happy to accompany you."

The two looked at each other and smiled.

So, Cao Rui and Wu Qingxuan began their retreat in the Equipment Refining Institute.

The two of them each had a weapon refining room, and when there was a problem, Cao Rui would humbly ask Wu Qingxuan for advice.

Wu Qingxuan had already figured out the materials for the second-order signal tower, so there was no need to make any major changes.

What Cao Rui wanted to learn during his retreat was the second-level weapon refining technique and the second-level [remote transmission]; Wu Qingxuan had already made some progress in the second-level weapon refining technique and only needed to hone the second-level [remote transmission].

Wu Qingxuan generously taught Cao Rui a second-level weapon refining technique [Spiritual Pattern Casting Source Technique].

This is a very superior second-level weapon refining technique.

"Spiritual patterns" represent the unique techniques of incorporating spirituality and magic arrays into the refining process.

Using this refining technique to engrave runes will make it more powerful.

"Casting the source" means to forge a magical instrument containing the power of the origin by refining materials and fusing elements, so that the magic weapon not only has a powerful external performance, but also contains a deep inner foundation.

This second-level weapon refining technique is quite profound.

Wu Qingxuan has only achieved some minor success in his practice so far.

However, after it is mastered, it can greatly improve the speed of refining, the success rate and the quality of the refined magic tools.

Cao Rui quickly condensed the experience beads of [Spiritual Pattern Casting Source Technique].

Cao Rui felt that he could integrate the basic weapon-refining techniques he had previously practiced to the perfect level into the [Spiritual Pattern Casting Source Technique].

Without any hesitation, he immediately supplied the perfect level of basic refining techniques to [Spiritual Pattern Casting Source Technique].

The added experience points are just enough to get started with the [Spiritual Pattern Casting Technique].

Afterwards, Cao Rui combined the weapon refining plans in the weapon refining academy, processed them himself, and customized a cheap second-level magic weapon for himself - a disposable second-level auxiliary magic weapon, the hidden weapon blasting needle, with a total cost of no more than a hundred spirit stones.

This explosive needle is ingeniously designed. Once fired, it will explode, releasing powerful force and causing considerable damage to the enemy.

However, for Cao Rui, this level of power was not of much practical use.

The power of Cao Rui's golden sword is greater than that of the exploding needle.

But if a cultivator in the Qi Refining Stage uses it, it will become a terrifying weapon.

Of course, for Cao Rui, the plan for refining this second-level magic weapon was not for actual combat, but to gain experience points for his [Spiritual Pattern Casting Source Technique]!

By constantly practicing and using the [Spiritual Pattern Casting Source Technique] to refine the second-order blasting needle, Cao Rui can accumulate more experience in refining equipment, thereby perfecting the second-order refining technique and using the perfect [Spiritual Pattern Casting Source Technique] to refine the signal tower.

Then it is time to engrave the second level [Remote Transmission].

The second-order [remote transmission] is much more complicated than the first-order [remote transmission].

However, Cao Rui made rapid progress by engraving experience points on metal plates.

in this way.

Three months passed in the blink of an eye.

Cao Rui consumed more than 50,000 spirit stones to purchase the raw materials for the explosive needle. After more than 500 times of refining, Cao Rui's experience beads in refining techniques increased rapidly.

In his initial attempts, Cao Rui inevitably failed in refining.

However, with the passage of time and the accumulation of experience, he gradually mastered the refining techniques and continued to improve them.

Finally, when he practiced the [Spiritual Pattern Casting Source Technique] to the level of minor success, major success, and even perfection.

The second-level explosive needle he refined is not only powerful, but also has a success rate of 100%.