A mage's guild is a type of building owned and operated by Karaten. They are useful for mages that need to stock up on supplies or looking for colleagues, and to everyone else, the portals are very useful, enabling quick travel to other mage's guild all over the world for a fee. They exist on all known major continents, sometimes in multiples, with the exception of Egwyn.
Portals have a few restrictions, however. Number one, no more than four people can be transported in one 'go' (many adventuring parties like to use this number as a guideline). Second, depending on the activity of Iahsus, portals may not be used as a safety precaution. Mage's Guilds also maintain a healthy line of communication with the local government, to prevent criminals from using them as escape tools.