Nota Bene: Do not apply a stat requirement to your guild if it will become an impediment to players gaining a particular guild.
In other words, if your guild is the only way for someone to become a whatever then you should not limit them from doing so with a stat requirement. You can levy a stat requirement for a preferred membership (an officer in the guild or an inner circle member) or for a guild that is not the only way for a player to attain a guild (e.g. if you are another fighters' guild then that's okay, but not if you are the only transmuters' guild).
Statistic Requirements for Guilds
Statistic Requirements for Guilds
"A man may die yet still endure if his work enters the greater work, for time is carried upon a current of forgotten deeds, and events of great moment are but the culmination of a single carefully placed thought." - Chime of Eons