Advance
Prussian Bishops
We shall grant further rights and privileges to our Prussian bishops, ensuring their loyalty in all matters.
TeutonsCountrypotentialAdvance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Reformation tree itself.
Modifiers
Definitionin_game/common/advances/country_TEU.txt:66
67content_priority = 400