From the publisher:
Some craftspeople are more than just workers for a wage.
For those who are driven, who have devoted their lives to the study of a craft, an opportunity might become available to develop it further. More than just a manufacturer, they become akin to an artist in their chosen medium. Their least of constructions is as good as the master craft of other craftspeople.
They might learn one of three paths: the Arcane, the Pious or the Technical; and each in turn have advantages in terms of development and ability. Their abilities are of little value in a brawl, but they can influnce powerful people and even entire cultures by their work.
The talented and driven of craftspeople are the Artisans.