He does have a second-level promotion crystal core in his hand, which is still red. But this crystal core has impurities... He is hesitant to use it.

If he continues to synthesize crystal nuclei without any impurities as before, he will need 3 crystal nuclei!

In the most unlucky situation - if he has to upgrade all four abilities to the second level before he can be promoted, he will need 12 promotion cores!

This requires killing at least 12 second-level zombies... Where can he find so many second-level zombies!

"How about using one first to try..."

Wang Tao struggled for a moment, and then decided to use this promotion core!

Isn't it just that some impurities accumulate in the body? As long as it is controlled within a relatively small range, it is still very safe.

The main reason is that the gorilla zombie is too threatening. It may come to the base at any time and does not give him a chance to slowly collect crystal cores...

Wang Tao took out the promotion crystal core.

Inside the promotion crystal core, there is a faint "+" shadow, which may indicate promotion.

[Second-order crystal core·Promotion]

[Quality: Excellent (80%)]

[Impurities: 45% (no side effects)]

[Promotion: After fusion, one of the abilities that has been fully integrated can be randomly promoted to the second level]

Wang Tao currently has two abilities that are +10, namely Shock Wave and Copper Skin Iron Bone.

One offense, one defense, no matter which one is upgraded to the second level, he can accept it!

Wang Tao directly put this excellent quality promotion crystal core into his mouth.

After the crystal core entered his mouth, Wang Tao felt that it turned into a gas, filling his limbs and bones in a short period of time.

Wang Tao felt warm all over, with an 80% success rate and no accidents.

“Comfortable~”

After a while, this warm feeling disappeared.

Some of Wang Tao's previous feelings of fatigue disappeared instantly.

He quickly looked at his attributes.

The health bar has not changed at all, it is still 4999, but the blue bar has changed, it was 2500 before, and now it is 2700!

In other words, a second-order crystal core adds 200 mana?

Then, as expected, Wang Tao gained an additional attribute.

[Impurities in the body: 0%]

Seeing this impurity, Wang Tao was a little helpless and hoped that there would be less impurities in the future.

And I don’t know if it’s a psychological effect, but Wang Tao always feels uncomfortable after there are impurities in his body...

As for the key point of this promotion to the crystal core - the promotion's special ability, Wang Tao had already sensed it without looking at the attributes. It was a shock wave.

Looking at his attributes again, the +10 in the lower right corner of the shock wave icon is gone, but there is an extra "two" in the lower left corner, which should mean the second level.

Nothing else has changed.

Wang Tao was going to go out and try out this second-level ability, and he also found an elite zombie to see if he could advance to the second level.

Han Rui was still called, and the two of them walked around outside. They didn't know if all the elite zombies nearby had been killed by Wei Zhenguo and the others, so basically none of them could be seen. Finally, they saw one, or something.

A self-destructor.

But as long as it is an elite zombie, Wang Tao used it to practice.

He carefully sneaked into the vicinity of the self-destructing zombie, used a slime grenade to control the self-destructing zombie, and then hit the self-destructing zombie with an ax in the air.

A shock wave visible to the naked eye appeared from the ax blade, and then hit the self-destructor heavily.

Then.

boom--

The self-destructor exploded!

But the sound was not loud, because it did not explode by itself, but was shattered by the shock wave! Even the solidified white mucus on its body was shattered.

"That's awesome! This is the second-level superpower!"

Looking at the minced meat on the ground, Han Rui exclaimed in a low voice.

And she suddenly thought of a question. If Wang Tao could instantly kill the self-destructor with one blow and prevent it from self-destructing, he would be able to save slime grenades and save a lot of time - walk near the self-destructor and chop with an axe.

It’s done!

This is the suppressive power of the second level on the first level!

"No, to be precise, this is only the power of the second-level superpower. I am not a second-level superpower user yet."

Wang Tao is not happy at all, because he still has not added blood. The most unlucky situation has arisen - maybe he has to upgrade all four of his abilities to the second level before he can advance to the second level...

"ah?"

Han Rui was stunned for a moment, and then after hearing Wang Tao's explanation, she felt a little regretful at first, and then thought of herself.

She currently only knows two powers, namely perception and charge. But she can feel that she can integrate two more powers. In other words, like Wang Tao, she can learn up to four powers.

But if Wang Tao wants to upgrade to the second level now, he may need at least four promotion cores!

If she only knew one kind of power, she might only need one promotion crystal core... Now that she knows two kinds of powers, she only needs two, which is twice as difficult as four...

"There is a price to pay for being strong!"

Wang Tao sighed.

Although the superpowers who fuse four kinds of crystal cores are more powerful, the difficulty of promotion is also doubled!

When he discovered that he could fuse four different types of crystal nuclei, he thought it was too little. How awesome it would be if he could fuse dozens or hundreds of types!

But now, Wang Tao just feels that it's a good thing that he can't fuse so many types of crystal nuclei!

Otherwise, if he can really fuse so much, it will be a question whether he can be promoted to the second level in this life...

"Then...are we still hunting zombies?"

Han Rui looked at Wang Tao and asked.

"kill!"

Wang Tao nodded.

He needs to find crystal cores! At least he needs to get three more promotion crystal cores, and search for second-level zombies.

Wang Tao now knows that there are two second-level zombies, namely the gorilla zombie and the hooded zombie. Even if they can be killed, if they can both explode the promotion crystal core, there will still be one crystal core left...

Moreover, he also needs to upgrade his precision shooting and self-healing levels. One of his two abilities is +4, and the other is still +1... He needs to hunt more zombies to collect first-order crystal cores!

Wang Tao and Han Rui stayed outside until dark before going back. They had bad luck today and found 5 elite zombies in one afternoon.

This is a far cry from the hospital. It's a pity that the zombies in the hospital don't come out.

"Go back and have a good rest."

Wang Tao said to Han Rui who got off the car.

"good!"

Han Rui added a lot of blood this afternoon, and now it has reached 3700! It is not far away from 4000 blood.

However, Han Rui was a little confused about the issue of fusing crystal nuclei. Wang Tao said that he still had a lot of crystal nuclei in his hand. If Han Rui was willing to fuse them, she could ask him for them.

But the more types of fusion crystal nuclei there are, the harder it is to advance. Han Rui is now a little unsure whether to continue fusion.

After all, reality is not about playing games. In games, you can take your time, but reality does not give you time to develop...

…

The next day.

Wang Tao asked Han Rui to go out to hunt zombies again, but this time it was not only Han Rui, but also Ding Yuqin, Gao Hua and Chen Zhuang.

All three of them have more than 1,000 HP. Killing ordinary zombies does not add HP, so you have to kill elite zombies.

Wang Tao didn't take them with him before because they had no experience in killing zombies, so bringing them out would only hinder them. Now after a period of training, he is basically a qualified hunter. Even the most inexperienced Ding Yuqin can hunt alone at the same time.

Let's pick some ordinary zombies.

So Wang Tao took them out to get more familiar with the characteristics of elite zombies, so that they could face them more calmly when they encounter them in the future.

Today's luck is better than yesterday. I encountered 16 elite zombies in one day!

Han Rui directly reached 4000 blood and fell into a deep sleep. Ding Yuqin, Gao Hua and Chen Zhuang also replenished their swords and felt the thrill of killing elite zombies.

After returning to the base before dark, Wang Tao felt that there were many unfamiliar faces today.

He asked Ding Yuqin and others to go back first, and then drove Han Rui, who was still awake, back to her home.

At Han Rui's house, Wang Tao accidentally saw Sun Weiguang.
To be continued...