Modifier
warfare_terrain_advantage_modifier
no in-game name
The modifier warfare_terrain_advantage_modifier is a named modifier in Crusader Kings III; the game gives it no name. It gives Enemy Defensive Advantage -10%. No add_…_modifier command in common/, events/ or history/ adds it. Patch 1.20.1.2, from game/common/modifiers/00_martial_lifestyle_modifiers.txt.
Effects
Where the game adds it
No add_…_modifier command in common/, events/ or history/ adds it.
Source: game/common/modifiers/00_martial_lifestyle_modifiers.txt (line 195), the English localisation (warfare_terrain_advantage_modifier, warfare_terrain_advantage_modifier_desc) and every add_…_modifier / remove_…_modifier in common/, events/ and history/, Crusader Kings III 1.20.1.2.