New players are automatically placed in a rookie guild (R class). The guild battles that take place here are "mock battles" and do not award Arthur medals.
After reaching level 20, players are transferred to a standard guild at 3:00 AM (PDT/PST) the following night.
Standard guilds' classes are assigned based on their guild battle ranking, with S being the highest class followed by A, B and C.
Currently, there are only B and C classes.