When Liu Zhengyang left, the city defense system had just been developed, and it was very different from the current city defense system.

From the appearance alone, the city defense system has undergone certain improvements.

He just didn't see the specific data, and Liu Zhengyang didn't know what the current capacity of the urban defense system was.

There is no danger to this advance team right now, and Liu Zhengyang doesn't care about watching it for a while.

"Sure enough, the same as last time!"

Polly watched his tribe attack the shield, and silently wrote down the frequency and amplitude of the shield's shaking. I have to say that under such an attack, the shield was quite stable.

At least the critical value has not been reached.

However, Polly is different from the ordinary royal family. When he comes into contact with human technology, he is very addicted.

As a royal family, Polly's memory can be said to be very outstanding. Taking advantage of the opportunity of the Black Soul invasion, he already has a complete set of scientific theories, and he has already studied them all.

It's just that his actions are quite despised by other royal families.

In their view, they have absolute strength and can completely handle what humans call science and technology. Under such a situation of crushing, there is no need to learn!

Polly's mind was quite tough, and others disapproved of him and ignored him, and after others laughed a few times, they lost interest.

After all, Polly is a well-known stranger in the family.

However, Polly's strength is still very tyrannical, otherwise he would not be valued by Poles.

"Listen to my orders for a while!"

Polly spoke suddenly.

The Meng Tan family frowned, but after all, Polly was the current commander in chief, and Polly was writing quickly when the protective shield was opened the first two times.

He couldn't understand what it was, anyway, but last time under Polly's command, he almost broke the **** protective shield.

Now that they heard Polly's order again, although these people hesitated, they still waited obediently instead of attacking randomly.

Polly muttered to himself.

"Resonance! Resonance can definitely cause problems with this protective cover!"

Seeing that the protective shield kept shaking under the attack just now, now that the attack stopped, the fluctuation range began to weaken.

And at this moment, Polly suddenly said, "Shoot!"

The giants of the Meng Tan family waved their fists and slammed into the protective shield almost at the same time.

The protective cover that was already going to calm down suddenly shook, and the amplitude of its tremor was even more violent than when everyone attacked together!

Although Liu Zhengyang cooperated with the demon emperor and handed over the city defense system to them truthfully, these demon races only have basic usage at all, and they don't even know what the flashing red light on this city defense system means!

A look of joy flashed in Polly's eyes. Although the city defense system has not been breached, the intensity of the shaking of the protective shield at the moment is enough to show that his guess is correct!

"Prepare!"

Polly's breathing became a little heavy, his eyes fixed on the jitter frequency of the protective cover, and then he waved his hand: "Hit!"

After this attack, the city defense system that was protected among the advance team suddenly emitted a puff of blue smoke, and then the lights began to flicker.

At this point, even fools know that there must be a problem with the city defense system.

"I know that human things are unreliable! Brothers, prepare to fight to the death!"

The tauren who had just praised the city defense system turned his head and began to belittle it, which can be said to be very realistic.