Modifier
Experimental Brew
experimental_brew_prestige_negative_modifier
The brewmaster has put together something truly unique and memorable, though... Not necessarily good.
Experimental Brew (modifier ID experimental_brew_prestige_negative_modifier) is a named modifier in Crusader Kings III. It gives Monthly Prestige -5%. No add_…_modifier command in common/, events/ or history/ adds it. Patch 1.20.1.2, from game/common/modifiers/00_court_position_modifiers.txt.
Effects
Where the game adds it
No add_…_modifier command in common/, events/ or history/ adds it.
Source: game/common/modifiers/00_court_position_modifiers.txt (line 13), the English localisation (experimental_brew_prestige_negative_modifier, experimental_brew_prestige_negative_modifier_desc) and every add_…_modifier / remove_…_modifier in common/, events/ and history/, Crusader Kings III 1.20.1.2.