Marina City, the first power station, the core of the deuterium-ion fusion reactor.

Xu Yongzhi looked at his daughter's figure in the arc in horror. Although he knew that there was no danger in doing so in theory, few people could survive the tens of millions of volts of high-voltage electricity and the deadly radiation that was all around.

Xu Yishan is working on a heat engine exchanger, which is deep inside the reactor. In order to save disassembly time, Xu Yishan simply went in to repair it - she was small anyway. Because of the charm, this critical equipment has an unknown malfunction, and the power of Marina City is cut off.

It took the father and daughter nearly twenty hours to troubleshoot most of the reactor. Today, only this complex heat engine exchanger needs to be repaired and commissioned. But the device is dangerous, with an unrivalled amount of electric current and ultra-high temperature nuclear fuel crisscrossing through its pipelines.

Whether it is an ordinary person or a cultivator, as long as it touches any point, there will be no bones left. But Xu Yishan was not afraid.

Because she designed and built the fusion exchanger, she knew every danger and was able to avoid it cleverly – in theory.

Of course, her dad didn't think so.

"Baby, change me. You take a break and drink a glass of water. ”

"No, Dad. I designed it, you can't handle it. ”

Xu Yishan didn't look up, or rather, she didn't even have room to look up. The interior of the heat exchanger is extremely narrow, and she is in a very awkward upside-down posture at this time. Thousands of test cables filled the remaining space, and finally gathered densely onto the tablet in her hand. It looked as if she was overwhelmed by complex pipes.

She slid across the tablet with one hand and changed the test plug with the other.

"You can't hold it. ”

"I can hold on. ”

Xu Yishan's face was expressionless, and her father could only sigh. Daughters are usually cute and obedient, except during working hours. Whenever this happens, Xu Yishan's identity becomes Xu Yongzhi's colleague, an overly direct colleague, not a dear daughter. Therefore, Professor Xu can't really drag his daughter out of it.

More than twenty hours have passed since the repair, and most of the faults have been resolved. Suddenly, Xu Yishan asked:

"Dad, have you tuned your new weapon? ”

"Well, there should be no problem, you can test it. Xu Yongzhi rubbed his hands, the new weapon was his proud work, "After the power is restored, you can come and take a look." ”

I'm not a useless adult, Professor Xu thought proudly. I've been suppressed by my daughter for a long time, and I must show off this time.

But Xu Yishan is not as laid-back as her father, she is not chatting.

"Dad, I still need 70,000 and 240 seconds to restore the power supply, but Uncle Lu can't last so long. ”

Xu Yongzhi was taken aback: "How do you know?"

They have been staying here to make repairs, and they don't know anything about the battle outside.

"I can hear you. Xu Yishan tilted her head, and she continued to rewrite the vortex stabilization program without stopping in her hands, "When objects of different forms are impacted, they will make different sounds. Based on the loudness, frequency, and timbre of the sound, it is possible to determine what exactly is being impacted. The southern gate had been broken through seven floors, but our side was firing less and less frequently. It seems that it is an enemy that cannot be stopped, and I am worried about Uncle Lu and Brother Lightning, they may be in huge trouble. ”

Xu Yongzhi took a deep breath, calculated for a moment in his mind, and replied: "If you can provide five million megajoules of energy, I think you can try to excite it once." ”

"I can fix a redundant energy channel and take the remaining energy out of the reactor, and in two thousand four hundred and thirty seconds you will have the energy you need. But only once. ”

"Got it. Xu Yongzhi took a deep look at his daughter and turned to leave.

"Daddy......"

"Huh?"

"It's up to you. ”

~~~~~~~~~~~~~~~~~~

Lu Ning was anxious at the head of the city, and the battle was fought from early morning to afternoon, and the five fire-tailed oxen had already broken through the seven-layer gate, and the rest was only a matter of time. If you don't get rid of these thick-skinned behemoths, Marina City won't survive tonight.

For such a long time from early morning to now, the human defenders have really tried everything, but it has no effect at all.

It's not that the Copperhead Irontail is really invincible enough to be immune to all means of attack. During this period, some defenders' shell-piercing armor shells pierced a bull demon, and some defenders used liquid nitrogen to freeze and crack one in the same way. Even in the end, Lao Lu Tijian personally went down and used exquisite swordsmanship to remove the horns of a bull demon. If it was only five fire-tailed oxen, the defenders would have killed them.

The problem lies in that eerie forest. Not only can it shoot dense black fruits to interfere with human attacks on the bull demon, but it also has a powerful recovery function.

No matter how seriously the fire-tailed ox was injured, as long as it rolled back to the forest range, after a burst of green demonic energy, it would immediately return to its original state.

Unless you can completely kill the Bull Demon in one go, all your efforts will be in vain.

Lu Ning didn't think of a way to deal with the forest, but whether it was a cannonball or an incendiary projectile, if it was smashed on the forest, the power would be weakened a lot. A high-explosive, grenade, and grenade can blow up a crater the size of half a football field on the ground. But just like that, a cannonball smashed into this forest, and only a few leaves flew away. The incendiary bomb is even more ridiculous, and if you hit it, you can only emit a puff of green smoke, and you can't see the flames flickering.

This scene is a little familiar to Lao Lu, but he can't remember it. It seems that it is related to the knowledge inherited from the previous era, and he has lost all of it when he destroyed the Dao Foundation.

The most frightening thing is that the forest is getting closer and closer to the city walls. When it first appeared in the morning, it was still more than ten kilometers away. And now, it has spread to a five-kilometer radius.

Because they were close, the defenders could see clearly. The branches on the edge of the trees were covered with the black fruits of the kind that sneaked up on the cultivators. And these fruits will keep falling, and when they fall to the ground, they will grow that kind of small dryad. The trumpet dryad took root and grows, but it will grow and mature in ten minutes, and the branches will bear identical black fruits.

This is how the forest spread step by step to the vicinity of the city walls.

Another round of impact of the fire-tailed oxen was about to begin, but at this time, everyone's morale was lost, and the sound of fire was sparse. This is an invincible enemy. Even the cultivators on high can't do it, and it's too normal for ordinary humans to feel hopeless.

Moreover, even if you can slaughter these five bull demons, the monster forest will spread to the city wall in a while. Many people were holding binoculars to observe the forest, and the gray fog inside was indistinct, but there were still many shadows of demons flashing by.

The large forces of the Demon Generals must be hiding in the forest, and there is nothing humans can do with them!

A fire-tailed ox proudly raised its horns and rushed to the city gate with its hooves. It was getting faster and faster, and the defenders already had a premonition that another gate would be pierced.

But at this moment, a white flash of light flew down from the city, knocking down the bull demon. In the blink of an eye, a giant white wolf bit the bull demon's neck and wrung it to the ground.

The bull demon's eyes were red, and his hooves were slashing to break free from the white wolf's giant kiss. But the power of lightning is not something that a single fire-tailed cow can fight.

Crunch, a huge bite crushed the bull demon's cervical vertebrae. Even though its bones were as golden as iron, it also let out an overwhelmed wail at the moment. But Lightning was still not satisfied, he roared in a low voice, and frantically shook his prey impatiently. Finally, with a bang, the whole bull's head was bitten off by him!