Crusader Kings III - Casus Belli Guide - MGW | Video Game Guides, Cheats, Tips and Walkthroughs

Crusader Kings III – Casus Belli Guide

Crusader Kings III - Casus Belli Guide

A casus belli (abbreviated as CB), sometimes abbreviated CB and meaning “Cause for War” in Latin, represents a justification for war that is recognized as legitimate by other characters. A ruler must have a valid casus belli in order to be able to declare war upon another ruler and can only gain from a war what the casus belli specifies.

 

Each casus belli will cost 1 81 Prestige and/or 2 19 Piety. If a character cannot pay the cost it can pay with a Level of Prestige or Level of Devotion instead. Declaring war against a character’s Head of Faith costs 500 Piety if the Head of Faith is Spiritual and 100 Piety if Head of Faith is Temporal.

 

Casus belli costs can be removed via one of the game rules.

 

casus belli

Requirements

Cost

1 82 Enforce Demands effect

2 20 White Peace effect

3 4 Surrender effect

Independence War  Target is the Liege  500 Prestige if not Tribal

250 Prestige if Tribal

Attacker becomes independent Attacker stays a vassal Attacker stays a vassal
Defender imprisons the attacker
Defender gains title revocation reason
Seize the County  De Jure Duchy of target County  100 Prestige Attacker gains the targeted County Defender keeps their titles Defender keeps their titles
Attacker must pay war reparations
Seize the Duchy  De Jure Kingdom of target Duchy  100 Prestige per County Attacker gains the targeted Duchy Defender keeps their titles Defender keeps their titles
Attacker must pay war reparations
Claims  Claim on the target  100 Prestige per County (own claim)

200 Prestige per Duchy (own claim)

400 Prestige per Kingdom (own claim)

800 Prestige per Empire (own claim)
250 Prestige per County (other’s claim)
500 Prestige per Duchy (other’s claim)

1000 Prestige per Kingdom (other’s claim)

3000 Prestige per Empire (other’s claim)

Claimant gains the targeted Titles Defender keeps their titles Defender keeps their titles
Claimant loses the Claims used
Subjugate  One of the following

  • Tribal government
  • Eastern religion
  • Temporal Head of Faith
 1000 Prestige if not Tribal

500 Prestige if Tribal

Attacker becomes the defender’s liege Defender stays independent Defender stays independent
Attacker’s Factions gain Discontent
Raid for Captives  Faith has the Human Sacrifice tenet  80 if faith has the Armed Pilgrimages tenet

100 if faith hasn’t the Armed Pilgrimages tenet

Attacker imprisons 3-5 of the defender’s courtiers Attacker gains no prisoners Attacker gains no prisoners
Excommunication War Same faith
Target has the Excommunicated trait
None Defender is Deposed Defender keeps their titles Defender keeps their titles
Defender loses the Excommunicated trait
Attacker loses Opinion with Head of Faith
Ducal Conquest of County  Conquest lifestyle perk  350 Prestige if target’s title rank is Count

750 Prestige if target’s title rank is above

Attacker gains the targeted County Defender keeps their titles Defender keeps their titles
Attacker’s Factions gain Discontent
Forced Vassalization  Forced Vassalage lifestyle perk  125 Prestige per County Attacker becomes the defender’s liege Defender stays independent Defender stays independent
Attacker’s Factions gain Discontent
Laudably Conquer County  Request Claim on Ireland decision  150 Prestige if Feudal and different faith

75 Prestige if Tribal and different faith

100 Piety if Feudal and same faith

50 Piety if Tribal and same faith

Attacker gains the defender’s titles Defender keeps their titles Defender keeps their titles
Attacker’s Factions gain Discontent
Mongol Invasion of Kingdom  Mongol Empire title

Tribal government

 200 Prestige Attacker gains the targeted Kingdom Defender keeps their titles Defender keeps their titles
Attacker’s Factions gain Discontent
Restore Imperial Province  Roman Empire title

Duchy was part of the Roman Empire

Religion is Christian or Greco-Roman

None Attacker gains the targeted Duchy Defender keeps their titles Defender keeps their titles
Attacker must pay war reparations

 

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    He is the founder and editor of Magic Game World. He loved gaming from the moment he got a PlayStation 1 with Gran Turismo on his 7th birthday.

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