Crusader Kings III 1.20.1.2

Game rules

The 86 rules you set before a game starts, with their 320 settings. The default of each rule is marked; a setting with ✕ disables achievements — all 28 of them in one list.

Crusader Kings III has 86 game rules in 11 categories (Difficulty, AI, Game Modes, Historicity, Health, Titles & Realm and 5 more) with 320 settings; 28 settings of 21 rules disable achievements. Patch 1.20.1.2, from game/common/game_rules.

This section as JSON: /raw/game-rules.json

Difficulty

Difficulty2 of 5 off achievements
- Normal (default)
- Hard
- Very Hard
- Easy ✕
- Very Easy ✕
AI
Random Harm
- Dangerous (default)
- Illusion of Safety
- Safe
- Tragic
- Spiteful
- Tragically Spiteful
Health
Random Harm Target
- Anyone
- Player Only
- AI Only (default)
Health
Conquerors: Frequency
- Default (default)
- None
- 50% Reduced
- 90% Reduced
- 100% Increased
- Default: Strong Only
- Reduced: Strong Only
- 90% Reduced: Strong Only
- 100% Increased: Strong Only
AI
Conquerors: Bonuses
- Default (default)
- None
- Extreme
- Random
- Low Random
AI
Conquerors: Inheritance
- All Heirs
- Primary Heir (default)
- No Inheritance
AI
Black Death Circumstance
- Historical (default)
- Organic
- Random
Health · Historicity
Black Death Frequency1 of 3 off achievements
- Once (default)
- Unlimited
- Never ✕
Health · Historicity
Plague Frequency
- Normal (default)
- Often
- Very Often
- Doomsday
- Rare
- Very Rare
- Disabled
Health
Minor Diseases1 of 2 off achievements
- Default (default)
- Fewer ✕
Health
Elderly Health1 of 3 off achievements
- Default (default)
- Infirm Only
- None ✕
Health
Realm Stability
- AI Only: Lesser
- Lesser
- AI Only: Lesser Limited
- Lesser Limited
- Default (default)
- AI Only: Higher
- AI Only: Extreme
- Higher
- Extreme
- AI Only: Higher Limited
- AI Only: Extreme Limited
- Higher Limited
- Extreme Limited
Tweaks · AI
Mongol Invasion1 of 3 off achievements
- Default (default)
- Never ✕
- Random
Historicity
Casus Belli Costs1 of 2 off achievements
- Default (default)
- No Costs ✕
Game Modes
AI Embarkation Cost
- Default (default)
- None
AI · Tweaks
Domain Limit3 of 13 off achievements
- Default (default)
- -1, player only
- -2, player only
- -3, player only
- +1, player only ✕
- +2, player only ✕
- +3, player only ✕
- -1
- -2
- -3
- +1
- +2
- +3
Tweaks
Scandinavian Adventurers2 of 5 off achievements
- Rare ✕
- Occasional
- Frequent (default)
- Apocalyptic
- Off ✕
Historicity · Flavor · The Northern Lords
Seljuk Invasion1 of 3 off achievements
- Default (default)
- Never ✕
- Random
Historicity · Legacy of Persia
Coronation Laws
- Default (default)
- Crowned Imperial Accession
- No Coronation Laws
Tweaks
Earthquakes
- Default (default)
- Rare
- Disabled
Floods
- Default (default)
- Rare
- Disabled

Game Modes

Gender Equality1 of 4 off achievements
End Date
- 1453 (default)
- No End Date
Same-Sex Relations1 of 2 off achievements
- Default (default)
- Accepted ✕
Same-Sex Marriage1 of 2 off achievements
- Default (default)
- Accepted ✕
Sexuality Distribution
Adoption1 of 3 off achievements
Faith Acceptance1 of 2 off achievements
- Default (default)
- Full ✕
Faith
Randomized Faiths & Rites1 of 2 off achievements
- Off (default)
- On ✕
Faith
Random Ruler Placement2 of 3 off achievements
Unrestricted Dynasty Legacies
Tweaks

Historicity

Tweaks

Legend Spread Chance
Legend Cost
Divergent & Hybrid Culture Cooldowns1 of 4 off achievements
Culture
Branched Rite Amount
Faith
Random Nickname Frequency
Flavor
Culture Conversion Speed2 of 5 off achievements
Historicity · Culture
Faith Conversion Speed2 of 5 off achievements
Historicity · Faith
Diplomatic Range1 of 3 off achievements
Historicity
Generate Families
Flavor
Max Amount of Landless Adventurers
Impact of Advantage
- 1
- 2
- 5 (default)
- 7
- 10

Multiplayer

Multiplayer: Murder Schemes

Source: game/common/game_rules (rules, defaults, settings, flags) and the English localisation, Crusader Kings III 1.20.1.2. A rule is listed under the first category its file names. See also domain, vassal and duchy limits.