Guild points are the equivalent of a player's energy. They are determined by the relevant **.points skill for your guild. Different guilds will use a different **.points skill to determine their overall GP. The **.points skills that don't determine your overall GP will affect how many Guild Points you may used for commands. Learn commands will use GP up the relevant GP (i.e. a magic command will use magic.points GP. How much GP you have in each branch is viewable with the "GP" command.
* Whilst not an official guild, Adventurers still have primaries and a skill that determines their overall GP.