Some buildings have a new quality, previously unseen in Total War games, called 'religious osmosis' (separate from religious influence).
Maybe I'm missing something obvious here , but what is it?
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Sign up to join this communityTurns out, it's the amount of religious influence exuded to neighboring provinces.
The ability fora majority religion to gain followers despite already being a majority, IE you have 70% relgion of your faction in your province osmosis would increase conversion to your religion