There are some who do not suit the untroubled life of the Artisan, the austere contemplation of the Reeve or the enduring clemency of the Consors. There are outsider castes but they are neither respectful nor respectable. They have their role in our society but we do not consider them. When they are needed, they are needed but it is a matter kept between the closest and most discreet of friends.
In some areas of the Citadel, the rule of Reeve does not apply. There are Artisans in exile who will copy any treasure. The Reeve do their best to cleanse the Citadel but there is only so much time and the tunnels are almost endless.