Enable it through either an ability during the Age of Reformation (replacing Mercenary Discipline or Powerful Tradeships) or a general option to convert provinces you do not own yourself.
Missionary strength malus -2%
Converting a province you don't own gives the owner of that province a retaliation cb where the war goal is to defend the province that is being converted, making it less attractive to target inland provinces and giving the attacker an inherent bonus since he's the one being attacked in the first place.
Missionary strength malus -2%
Converting a province you don't own gives the owner of that province a retaliation cb where the war goal is to defend the province that is being converted, making it less attractive to target inland provinces and giving the attacker an inherent bonus since he's the one being attacked in the first place.
