Through the "Eye of Insight", Cao Fan saw that almost all of these empty ships had a rune array hidden inside.

There are many kinds of rune arrays, some can be used to fight enemies, some can be used to extract spiritual veins, some can be used to move mountains and seas, and some can be used to break the formation.

As a quasi-fourth-level formation master, Cao Fan recognized this rune array almost at a glance as being used to fire rune cannons.

Its principle is to convert the energy generated after the formation runs into a rune cannon to bombard the opponent.

The larger the rune circle, the higher the level of spirit stones used, and the greater the power of the rune cannon transformed.

The rune arrays in these empty ships of the Qingtian Sect each have a square circle, which is relatively large.

Moreover, Cao Fan also noticed that the spirit stones of these rune arrays were all used in medium-grade spirit stones, and their power should not be underestimated.

"Fill the Spirit Stone Warehouse immediately, the next wave of enemy attacks is about to begin!" Cao Fan immediately issued a warning to the Cangyun Sect monks who were guarding the spirit stone warehouses at each node.

At this time, Wei Chiguang was also giving an attack order to the air ships, "Activate the rune magic array and prepare for the first round of bombardment!"

Soon, the rune arrays that were originally hidden in the empty ships were lifted to the deck.

Around each rune array, there were several disciples of the Xuan Array Hall who were quickly activating the formation and adjusting the direction of the attack.

With Wei Chiguang's order, the light of the rune magic arrays on the more than thirty empty ships flickered, and a large amount of formation energy quickly condensed and transformed into rune cannonballs, and then flew out with a "bang".

The Rune Cannon does not have a fixed shape, but is a highly compressed energy body. Once it collides with the target, the energy inside will burst out violently, turning the target into ashes in an instant.

Of course, this is only against units that do not have any protective measures. And this time, these rune cannons were facing a third-level peak protector array with excellent defensive ability.

Thirty-four rune cannons quickly slammed into the defensive shield of the large array, and the energy inside was suddenly vented, producing a powerful destructive force.

The spirit stones in the spirit stone warehouses of each node were rapidly consumed, and a wave of bombardment came down, and the spirit stone warehouses that had just been filled had been reduced by forty percent of the spirit stones.

The power of these rune arrays in a volley almost reached the effect of breaking the formation on a scale of 1,000 people before.

After a round of attacks, the spirit stone warehouse of the rune array bottomed out all of a sudden.

With such a salvo, the total consumption of medium-grade spirit stones by all the rune arrays has exceeded a thousand.

As the saying goes, "When the cannon sounds, there are ten thousand taels of gold", a round of bombardment of these rune cannons is equivalent to consuming more than 100,000 ordinary spirit stones.

This is also the reason why Yu Chiguang did not choose to use the rune cannon to bombard the Cangyun Sect in the first place.

The advantage of the rune cannon is that it has a long range, is powerful, and there will be no casualties.

However, the disadvantage is that it is extremely depleting of spirit stones, and the power of all the monks of the Optimus Sect to attack together at the beginning is also much better than the destructive power of the salvo of the rune cannon.

Wei Chiguang just didn't expect that the counterattack of the Cangyun Sect would be so decisive and sharp, and their casualties would be so heavy.

At this time, even if he was reluctant to spend spirit stones, he could only consume them head-on.

"Immediately replenish the spirit stones and launch a second round of attacks!" Yu Chiguang continued to give the order without hesitation.

The annual funding of his Foreign Affairs Hall is only one or two million, and even if he is allowed to use it to fight rune cannons, it will only be about ten rounds.

Of course, this spirit stone can't all be produced by the Foreign Affairs Palace, and the other three halls must also participate in the equal sharing.

After all, the benefits are shared equally by everyone, and this is also for the benefit of the sect.

As soon as the rune cannon was fired, blood was dripping from the hearts of the high-level leaders on both sides.

It costs money to beat someone, and it costs money to be beaten.

The cost of beating is even greater.

Ten rounds of rune cannon fire attack resisted, and the Cangyun Sect had already consumed more than 400,000 spirit stones.

The spirit stones that had lost more than one million dollars on Yu Chiguang's side still did not change, and when he was about to give the order to continue the next wave of attacks, the other three hall masters had already stopped him.

The one in front was the spirit stone of the Foreign Affairs Palace, and they were not distressed. But then they had to use the spirit stones of their three halls, and Tong Song, the hall master of the Xuanzhen Palace, stopped doing it first.

Among the four halls, the funds of the Xuanjin Hall are the most tight, and the external speed of the array is far less than that of alchemy and refining, and it is not as good as the foreign affairs hall with strong financial resources. After all, if people just find a third-level sect to destroy from the beginning, they can make a lot of money.

"You can use the rune cannon, and my Xuanjing Hall will produce a maximum of 300,000 spirit stones, if there are more. Tong Song said categorically.

"My Spirit Pill Hall can take 600,000 spirit stones out. In recent years, the sales of pills have been a little sluggish, and many commercial buildings have also lowered prices...... "Gao Xin, the hall master of the Lingdan Palace, said very seriously, as if the landlord's family had no surplus grain.

Pu Guangcheng, the hall master of the Treasure Palace, saw Yu Chiguang looking at him, and hurriedly said: "Recently, the materials have not been easy to collect, and the amount of artifacts produced here has decreased sharply. However, it is our duty to support Brother Wei Chi and the sect, and my treasure hall is also willing to give out 600,000 spirit stones. ”

Wei Chiguang was very angry in his heart. When discussing the spoils of the Cangyun Sect, they were more active than anyone else, and when it was time to come out of the spirit stones, they cried poorly.

Tong Song saw that Wei Chiguang's face was a little wrong, and hurriedly said: "There are formation talents in the Cangyun Sect, and with the rune cannon alone, I am afraid it will be difficult for us to break through their Sect Protector Array." ”

Yu Chiguang's expression lit up, "You mean we take people to kill again?"

Tong Song nodded, "I calculated just now that we can consume about forty percent of their Spirit Stone Warehouse reserves by firing a rune cannon. The rest of us are attacking the big formation with all our might, and we can also consume two or three of their protective power in the big array. In this way, it would definitely be difficult for them to keep up with the speed at which they replenished the spirit stones, and it would be much easier to break the formation. ”

Going down to attack the Great Array would naturally speed up the speed of breaking the formation, but it would also inevitably increase the casualties of the Heavenly Sect cultivators again.

Wei Chiguang weighed it, nodded and said, "The greater the resistance we encounter in breaking the formation, the more we will benefit after entering the Cangyun Sect." Let's do it together, for the sake of the dead fellow sect, for the sake of the interests after the formation is broken, and for the sake of my Qingtian Sect, we will destroy the Cangyun Sect in one go!"

Neither of the other two hall masters objected. So far, every hall has paid a huge price, and if it is so fruitless, there will be no way to explain it to the sect master in the future.

The rune array was still roaring, firing rune cannons to impact the Cangyun Sect's Sect Protector Array.

The last more than 300 Qingtian Sect monks flew out of the empty ship one after another under the leadership of their respective hall masters, and once again slaughtered towards the mountain gate of the Cangyun Sect.