I'm thinking that this class could have a couple of slave-specific talent trees and a couple other fixed talent trees. The rest of the talent trees can be either (1) semi-random, (2) chosen, or (3) semi-randomly chosen. I don't know if I would prefer (1), (2), or (3) yet (or none of the above). If the race of the character is magical, then perhaps they could have access to some magical trees. Non-magical races would not have access to magic. I have a couple ideas floating around about what the slave specific talents could be and how to structure semi-random talent trees, but I'm interested to hear your ideas.You were born into slavery and you know one thing: survival. Many masters have used you, abused you, and then sold you to your next master. You have finally gained your freedom after many trials and tribulations, and you are eager to explore the world. You were never properly trained; instead, you have a hodgepodge of semi-random talents and techniques that you have learned in order to survive. It is time to exact your revenge.
I think this class should be focused on Constitution and Willpower. The third main stat would depend on other talents and how the player decides to play.
Oh, and obviously the slavers compound could be of special significance to this class.
Sorry this isn't very well fleshed out--I kinda have a different project I'm working on right now