a group of adventurers

There are several types of hierarchies in the adventurers' guild

Wood class adventurers: These are beginner adventurers, those who have not yet completed at least 10 quests.
Stone class: They have completed at least 10 missions and require at least somewhat decent power for the upcoming missions.
Bronze Class: Become a Bronze Adventurer after completing 30 quests of the previous level.
Silver class: (where the adventurers are) is obtained by completing 40 missions of the previous level, and is given some benefits such as discounts in the guild stores
Gold Class: Obtained after completing 45 missions of the previous level, discounts increase and you have permission to obtain magic items in a special store
Platinum class: obtained after completing 60 missions of the previous level and is considered a hero
The last level is the emerald level: here adventurers, now heroes, only get it by destroying or avoiding threats that could cause significant damage to the world.

I clarify that adventurers can advance in class by doing two missions of a higher level