Excellent background character. Leaves plenty of room for things to pop-up out of nowhere.
It might be feasible for Corvis sighting rumors to spread. A crazy man in ragged robes with blue eyes spouting inanities in the middle of the street might fit the description of a crazed Corvis. Maybe give him an orb that glows slightly whenever someone shouts around it. Go to Comment
Historicly, we have had plenty of rl groups like the Taliban and the Puritans who supressed anything which was in any way fun. What if there was some group that was the opposite? (which in time would cause problems of it's own for the civilians under their control.)