In Zhao Mubai's study, after having a hasty dinner, Zhao Mubai sat in the study, and specially instructed Deliana not to let people disturb him if there was nothing extremely important.

The clock on the wall was slowly turning, and the hands were less than a minute before nine o'clock.

Zhao Mubai clasped his hands together and rubbed them slowly, he was a little eager to take a look at what the updated system would become.

When the hour hand pointed to nine o'clock, a cold mechanical sound appeared in Zhao Mubai's mind.

"Drip, the system update has been completed, please pay attention to the host, this update takes four hours"

Immersed in it, the light blue page with a sense of science fiction reappeared.

The whole page has become more concise than before, and compared to the previous interface that was split in two, after this update, a third branch of the system has appeared.

"Class advancement?" The huge text made Zhao Mubai even more confused, and with curiosity, Zhao Mubai clicked on the new page.

The huge page was transformed like a page, and all the troops that Zhao Mubai had recruited from beginning to end appeared on the page.

"System, this class is advanced, what's going on with falling to the ground?" Zhao Mubai already had a certain conjecture vaguely, but he still needed to confirm it personally through the system.

"Drop, the advanced branch of the class that appeared in this update is a new branch to allow the host to improve the combat effectiveness of the soldiers under his command more quickly."

"Through class advancement, the troops previously drawn by the host will have the possibility of improving their strength, and at the same time, through this advancement method, the troops under the host's command will also have more possibilities!"

The cold voice of the system echoed in Zhao Mubai's mind, and after hearing the system's explanation, Zhao Mubai fell into a state of excitement and ecstasy.

The appearance of the advancement of the class is really like the existence of timely rain, and the zombies and mutant beasts improve their strength very quickly, and epic mutant beasts have appeared in just half a year.

The previous system restricted the development of all classes, resulting in the current Black Iron level troops such as Silver Hand Recruits, which have no use at all

can only be reduced to the guards of the gathering place, and even now, except for ordinary people, even the Chosen One cannot effectively organize confrontation.

In addition to the Silver Hand recruits, other units such as the Wolf Cavalry, Phantom Marksman, Terran Machine Gunner, and the main ship scout team are almost on the verge of obsolescence.

But now, the emergence of the advancement of the troops allows these troops to rejuvenate a second spring, how can Zhao Mubai not be excited.

"After the advanced branch of the drop and the class appears, the system will close the host's extraction permission for the black iron and bronze level troops, and the host can only extract the matching level troops in the future, please pay attention to the host!"

Zhao Mubai was slightly stunned and turned off the extraction permission for the black iron and bronze level troops, is this to prevent himself from extracting troops in large quantities, and then using the troops to advance and improve his strength?

While his heart sank, Zhao Mubai continued to ask, "System, is there anything else that has changed in this update?" ”

"Drop, this update has adjusted the number of gold-level and above troops, including the gold level, and has greatly enhanced the number of individual gold-level troops, still maintaining its uniqueness, but it can be resurrected for high energy points, and the resurrection cost is proportional to the number of resurrections, and each increase is N*1000"

Zhao Mubai thought for a moment, the system's adjustment of the gold-level troops and above seems to be quite subtle, in addition to a large-scale increase in the number of troops, it has also added a resurrection mechanism?

Doesn't this mean that as long as he has enough energy points, he can resurrect those classes without limit?

With anticipation, Zhao Mubai asked again, "System, if I want to resurrect Freddy, how many energy points do I need for the first and second time?"

The system quickly gave an answer, but the answer given by the system completely dispelled Zhao Mubai's previous thoughts.

"Drop, Freddy is a gold-level class, and the first time it needs to resurrect energy points is 10 million, and the second time is 10 billion!"

The first resurrection costs 10 million, although this number seems huge, but it is not impossible to achieve, but the second resurrection actually needs 10 billion!

That's 10 billion, even if Zhao Mubai makes people desperately hunt mutant beasts and zombies to get energy points, I'm afraid they won't be able to reach this amount in this life!

The little thought before suddenly disappeared, and Zhao Mubai could only comfort himself, it would be good to be able to resurrect once, don't be too greedy.

"System, how many energy points do I have left?" Zhao Mubai asked in a deep voice.

Since he went to Changbai, he hadn't paid attention to his energy points, and before leaving, he specially asked Darius to lead the second battle group to harvest zombies and mutant beasts, and he didn't know how much he had accumulated in the past month.

"Drop, the host now has a little bit of residual energy with 9868211 points!"

With nearly 10 million energy points, Zhao Mubai subconsciously asked again, "How much?" ”

Thanks to the fact that the system itself is not a human being, if it were a human being, I am afraid that I would have expressed impatience with Zhao Mubai a long time ago.

"Drop, the host now has 9868211 remaining energy points!"

With nearly 10 million energy points, Zhao Mubai instantly had the feeling of turning over and becoming a landlord, this was the first time he had accumulated such a huge amount of money since he had a system!

Zhao Mubai immediately became high-spirited, didn't he still have four chances to draw the lottery, and this time he also had to spend a lot of money.

But before that, Zhao Mubai was still going to take a look at what was going on with that class advancement.

On the branch page of the troops, all the troops that Zhao Mubai has drawn are listed here, and there are nearly twenty different types of troops from low to high.

Clicking on the advanced tree of the Bronze Hand recruits, Zhao Mubai felt as if he had discovered a new continent.

Silver Hand Recruit

Grade: Black Iron Grade

Progressable branches: Bronze-level class, Silver Hand Senior Squire, Silver Class Bronze Hand Knight

The cost of energy points is 50 per unit

After seeing that the energy points needed to spend only 50 points, Zhao Mubai breathed a sigh of relief, the system was still relatively conscientious in this regard, although the energy points required had more than doubled the energy points of the previous conscription of the unit.

But compared to recruiting a bronze class, it's a lot cheaper.

And after seeing that the advancement of the Bronze Hand recruits was only bronze, Zhao Mubai had another doubt.

"System, can the advanced class be advanced again?"

The answer to the system of "drop, each unit can be advanced twice in a row" can be said to be quite straightforward.

It's only twice, Zhao Mubai is a little dissatisfied, two times means that the Silver Hand recruits will at most advance to the silver level, and when converted, it will be comparable to the Moonlight level Heavenly Chosen One, and it will reach the limit.

In fact, if you think about it carefully, the rules of the system are still very reasonable, just like humans, the troops recruited by the system also have potential.

Otherwise, if Zhao Mubai's energy points are enough, he will forcibly raise the black iron level troops to the gold level, which will make there is no need for other levels of troops to exist at all.

Although he advanced the other troops one by one, Zhao Mubai completely satisfied his curiosity.

Terran machine gunner

Grade: Black Iron Grade

Progressable branches: Terran Storm Gunner, Terran Star Commando

The cost of energy is 60

Phantom Shooter

Level: Silver

Progressive: Phantom Marksman, Phantom Jungle Assassin, Phantom Ranger

The amount of energy required is 160

It can be said that all the troops under Zhao Mubai's command at this stage all have different advanced branches, and so many choices make Zhao Mubai a little difficult to choose.

After all, unlike the previous class of troops, the class itself has a strong randomness, and Zhao Mubai has no way to decide to fall to the ground and draw that class.

But now it's different, he can choose a variety of different advanced directions at will, so he needs to choose more carefully.

"System, can I choose two different progression directions at the same time?"

"Drop, yes"

The system's answer made Zhao Mubai very satisfied, which represented more possibilities, but how to choose, he also needed to refer specifically to the commanders of each army, after all, in terms of familiarity, the commanders of those various arms were much stronger than Zhao Mubai.

Imprinted all the advancements of all the troops in his mind, Zhao Mubai, who had advanced to the epic level, already had the so-called ability to be well-read and memorized.

A lot of things can be remembered just by looking at them once.

Recording these advanced troops one by one on paper, Zhao Mubai put on his coat and walked out of the villa.

Came to the secluded and uninhabited Changbai Mountain, the wind at the top of the mountain was even worse, and Zhao Mubai's windbreaker was blown to hunt.

Immersed in the system, Zhao Mubai became a little expectant, now he still has four opportunities to draw troops, I don't know what kind of gold-level troops he will draw this time.

"System, carry out gold-level class extraction!"

"Drop, start randomly drawing gold classes"

"Drop, the gold-level class has been drawn!"

On the huge turntable, four different classes are evenly distributed throughout the turntable.

"Spiritual Mentor - Yuri"

"Mewtwo Clone Legion"

"The Medicine Clan of the Ancient Eight Tribes"

"Kassel Academy Students"

The turntable began to rotate rapidly, and Zhao Mubai's heart began to tangle with the turntable.

"Drop, congratulations to the host for extracting the medicine clan of the ancient eight clans!" The cold chime of the system sounded again!

PS: After reading everyone's book reviews, the suggestions put forward by the book friends are very good, and after careful consideration, such a modification was made, and the appearance of the system will be improved, and the advancement of the troops will be more diversified.

If you have a lot of suggestions, I will choose to refer to them one by one.