It triggers after about 200 days and you also need about 20 renown. It will start automaticaly once you fulfill all those conditions.
Viewing post in Sinathir 0.29 - Bestiary and more comments
Oh alright, that's nice to know.
Another question, will having visible mutation do anything to my encounter later with Mr White? The bonuses with having mutation seems like not a bad idea but with some people not liking mutation I was thinking if Mr White was the same as those people who hates mutants
Edit: Also will my role as cult initiate effect any encounter? or is the role stuff still under development?
White doesn't care about mutations at all. He will even encourage you to get them in the future.
I think there is one encounter that gets affected by being initiate, but I don't remember the details. Other than that, the rank itself does nothing. It's the uniform that matters.
Wearing the uniform will make pretty much everyone offer you a discount when trading. It will also make Billy talk to you if angered him before.