Reborn after the apocalypse, my whole family is stockpiling like crazy!

Cha Cha listened to the flattering voice of the Doomsday System and looked over. The Doomsday System then returned to its normal voice: "Don't be angry, Cha Cha. I will never have any more small thoughts. I swear."

Cha Cha: "How many crystal cores do you need to reach the maximum level?"

"Cha Cha, are you asking this to help me contract a new master?"

"Stop talking nonsense and answer my question."

......

Zhi Nanyi looked at Cha Cha's behavior that she had never shown before in front of him, and leaned close to Xu He'an's ear: "Look, Cha Cha is quite cute even when she looks fierce like this!"

"You..."

Cha Cha and the Doomsday System quickly explained the matter. The Doomsday System was very excited: "Really? Are you really willing to sign a contract with me?"

Xu Hean didn't expect that this 'Doomsday System' would be such a chatterbox, and he certainly didn't want to listen to it whining anymore.

"Tell me, how do we make the contract?" Xu Hean spoke directly to stop the 'Doomsday System' from continuing to hum.

The 'Doomsday System' was a smart guy. It could see that Xu Hean didn't like its appearance and had wasted its time in the world of Tongzi for so long, so it immediately became obedient.

"Host, as long as you are willing to make a contract with me, I will take care of the rest!"

Xu Hean nodded and signaled for the 'Doomsday System' to begin.

After getting Xu Hean's confirmation, the 'Doomsday System' was afraid of losing this opportunity and immediately began to sign a contract with Xu Hean.

Xu Hean soon heard a voice in his mind: [Ding, host, please confirm whether to bind with the system? ]

"Yes."

[Congratulations to the host for successfully binding to the Doomsday System. The system contains an exchange mall. The higher the system level, the more goods can be exchanged. ]

"Tell me everything you know about the Zombie King."

The 'Doomsday System' was stunned for a moment. Now it understood why it suddenly made a contract with itself. It turned out to be for this.

But since he was already bound to Xu Hean, and with Cha Cha supervising him, he could not afford to be petty, and the 'Doomsday System' could only answer obediently.

[Return to the host. When you reach the maximum level, you can unlock the Doomsday Manual and the Ultimate Weapon in the exchange mall. The manual records all the zombie types and abilities that have appeared in the universe. The Ultimate Weapon is used to deal with the Zombie King. This weapon can not only kill the Zombie King, but after being used proficiently, you can even control the Zombie King and make him serve you from now on.]

[However, the specific level of proficiency depends on the host's personal talent. ]

"How many crystal cores are needed to reach the maximum level?"

[Upgrade? Upgrade to the maximum level? ?] Doomsday System asked again in disbelief.

"Yes, it's fully upgraded."

After confirming it personally, the 'Doomsday System' didn't expect that good things would happen to it one after another. It had been upgraded to the maximum level. That was a full level upgrade. It had been thousands of years since it was created by the main system. This was the second time it had a chance to be upgraded to the maximum level. How could it not be excited?

It has been 982 years since it last reached the maximum level. It still remembers that after it reached the maximum level, its host at that time became a centenarian with many merits. Originally, it and its host at that time should have disrupted that world, but it did not expect that the host would eventually become the savior of that world. Not only did he develop a specific medicine for the zombie virus, but he also saved the remaining humans in that world.

It was only one step away, just one step, from retiring and living a happy life with everything it wanted in the universe. Unexpectedly, it was almost punished in the end because of the host's great merits. Fortunately, those crystal cores were of great use to the main system, so it was exiled back into the universe and began its wandering days.

Cha Cha saw that the 'Doomsday System' fell silent after hearing these words, so with Xu He'an's permission, she quietly hacked into the memory storage hard drive of the 'Doomsday System', and then she knew why it was like this. But at the same time, Cha Cha also confirmed one thing, that is, this 'Doomsday System' is not as the legend said, in fact, it is both good and evil, and it mainly depends on how its owner uses it.

Cha Cha knew all this, and Zhi Nanyiyi and Xu Hean also knew it at the same time. Now Zhi Nanyiyi’s worries were finally put to rest.

The 'Doomsday System', which was lost in its memories, had no idea that its past was completely known by the 'Two-in-One' in front of it.

"How many crystal cores are needed to reach the maximum level?"

Cha Cha's words brought the 'Doomsday System' back to reality. It was afraid that Xu He'an and Zhi Nanyi would regret it, so it immediately responded to Cha Cha's words.

"Wait a minute, I, let me calculate it!"

30 seconds later, the 'Doomsday System' finally figured out how many crystal cores were needed. It had never calculated it before, and now it suddenly needed a total number. The 'Doomsday System' discovered that it was a really large number.

[Host, um, you need a total of level 2 crystal cores. If you have level crystal cores, the number can be reduced by at least half. If you have level crystal cores, the number can be reduced even more.]

"You actually need more than two million crystal cores. You are definitely a scam!"

[Host, I am really wronged. This is the setting of the main system, and I have no way to change it.] The 'Doomsday System' cannot tell the host why it needs so many crystal cores. What it doesn't know is that Cha Cha has already understood it very clearly.

Cha Cha knew that this time the 'Doomsday System' did not lie, the number was set by the Doomsday Main System, and the Main System needed the energy in those crystal cores, so she whispered to Zhi Nanyi: Master, it did not lie, it really needs so many crystal cores.

Zhi Nanyi nodded to Xu Hean, then said to Cha Cha: "Then let's count and see how many crystal cores we have now."

In fact, Zhi Nanyiyi had quite a few crystal cores. Ever since he had agreed with Song Chengyang on the crystal core liquid, Song Chengyang had given two-thirds of the crystal cores in the Black Wolf Gang to Zhi Nanyiyi for exchange. Zhi Nanyiyi directly gave Song Chengyang enough crystal core liquid for two years. Song Chengyang was so happy that as long as he got the crystal core, he would immediately give it to Zhi Nanyiyi.

Cha Cha quickly counted the number of crystal cores in the space: "Master, we now have level one crystal cores, level two crystal cores, 3251 level three crystal cores, 126 level four crystal cores, and 5 level five crystal cores."

"I suggest that the master keep the fourth and fifth level crystal cores, and the others can be used to upgrade it."

Zhi Nanyi: "Okay, I understand. Thank you, Cha Cha."

Xu Hean looked at the 'Doomsday System' and pointed at the crystal cores on the ground: "Are these enough?"

Doomsday System: [Host, wait for me! ]

After a quick calculation, the Doomsday System spoke: [Host, if I use all of these crystal cores, I can upgrade to level 8. The maximum level is level 10, and I need more crystal cores.]

Zhinanyi:.......

I really doubt it. This is not a system, it is a glutton.