Chương 233: Chapter 234 Upgraded the Doomsday Refuge Again, Acquired New Powerful Abilities

However, as an ultimate econnoisseur, Jack couldn't be satisfied just by getting this information.

Before the system turned off, Jack tentatively asked, "System, can you tell me how many levels my refuge needs to be upgraded to resist the doomsday disaster?"

"If you pursue 100% safety, I suggest you raise the level of the refuge to level 150!"

"When the refuge reaches level 2,000, which is also called grade 20, it will unlock a very powerful function!"

The system told Jack all the information.

"Upgrade to level 150?"

Jack frowned.

It was known that if Jack had to upgrade the refuge, he would have to pay a total of 6,000,000 survival points at one time.

This was not a small number!

After thinking for a long time, Jack gritted his teeth and made a decision.

"System, I want to upgrade the refuge to 150 levels!" Jack said bluntly.

"Okay, I'll start the service now!" The system replied to Jack coldly.