Could you please give more insight to each of the roles?
I get that a judge 'judges' people, but when, where, and why?
Assassins assassinate people, but why and when would they be needed?
Spies spy on people, but for what reason? How would that even work?
And a guard, well, guards, but what do they guard?
There should also probably be a few more roles than just four, but it is a good start, I would just like to know more.