บท 216: Chapter 151 I Help You Buy Time_2

"To upgrade to Level 4 Authority, one must thoroughly crush an Abyss Calamity of at least 13th Rank that their civilization has encountered."

...

Aside from the initial greetings.

Jiang Chen and Lan Yi didn't avoid the other two mecha pilots when exchanging information about Purgatory levels and civilization levels.

These two mecha pilots were also members of the Order civilization and Fire Transmitters, with a relatively friendly attitude.

Moreover, the four of them were in a team, so they naturally joined the information exchange.

They added plenty of details for Lan Yi and offered quite a bit of information as well.

Unfortunately, although they were willing to share some information.

As for how to upgrade to Level 5 Authority, they only provided a hint—

"To upgrade to Level 5 civilization authority, one cannot achieve it through normal means but requires special materials."

As for what those materials or methods are.

The answer was that they didn't know.