There are many different societies in Magistream, some larger and some smaller. While the main guilds are quite selective of who can join their ranks, and barring access from those who are already part of another guild, there are also smaller, more specialized groups, called Associations, that are ready to welcome anyone.
Head over to Synara City to embark on a quest to gain access to one such Association.
At the moment you will not be able to leave an Association once you've joined it.
Discussion and questions can be directed at the thread in the Community Discussion: 8-community-discussion/208467-new-type-of-guilds-the-associations.html