Modifier
Hard
hard_difficulty_player
Hard (modifier ID hard_difficulty_player) is a named modifier in Crusader Kings III. It gives Mercenary Hire Cost +50%. No add_…_modifier command in common/, events/ or history/ adds it. Patch 1.20.1.2, from game/common/modifiers/00_basic_modifiers.txt.
Effects
Where the game adds it
No add_…_modifier command in common/, events/ or history/ adds it.
Source: game/common/modifiers/00_basic_modifiers.txt (line 351), the English localisation (hard_difficulty_player, hard_difficulty_player_desc) and every add_…_modifier / remove_…_modifier in common/, events/ and history/, Crusader Kings III 1.20.1.2.