AdvanceChanged this version
Strength of the Boyars
The Boyar class is in many ways the foundation of Russia, but just as we need to strengthen the Boyars, we also need to control them. We must protect seats for the Boyars in the Duma, but also to make sure that they are dependent on us to further their influence.
MuscovyCountrypotentialAdvance 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_MOS.txt:40
41content_priority = 500