Disease

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Disease plays a large role in Base icon CK2.png Crusader Kings II, due to the lethality of ailments in the Middle Ages, and generally bad side effects they give to the player character. Most characters are capable of living through the majority of diseases, though some may still die when an outbreak occurs.

All diseases are represented by health traits.

Normal diseases[edit]

Disease Description
Ill.png Generic Illness

The most simple type of "disease," the trait ill reduces martial by 1, health by 2, and fertility by 10%.
Unless the ill person in question is very old, weak, or has another disease, the odds of someone dying from this trait is very low.
Generic illness and pneumonia are mutually exclusive. It is needed to have a health level of at least 3 to recover from this disease.
If DLC icon Reaper's Due.png The Reaper's Due Expansion is active, the illness trait is replaced by symptoms which will be treated by a court physician.

Pneumonic.png Pneumonia

Incompatible with ill, the pneumonic trait is far far more deadly. It reduces all attributes by 2 and reduces health by 4.
It also reduces fertility by 50%, making most characters very unlikely to procreate. The trait is often deadly; do not expect to have player character rulers survive this one every time.
It is needed to have a health level of at least 4 to recover from this disease.

Leper.png Leprosy

Another moderate disease, leprosy makes holding a large kingdom or empire together very difficult.
It reduces diplomacy and health by 2, and fertility by 20%. It also reduces sex appeal by 50, and all vassals opinions of their liege by 20.
Though leprosy has a +10 bonus with other lepers, chances are that a character will not make use of that bonus often.
It is needed to have a health level of at least 4 to recover from this disease.

Syphilitic.png Great Pox

A moderately dangerous disease, syphilis reduces all attributes by 1, health by 2, and fertility by 20%. Furthermore, it reduces sex appeal of the character by 30.
This disease will most likely shorten the lifespan of the player character, though it will not necessarily result in an abnormally early death.
One of the most dangerous features of this disease is that it can be passed down to children if one of their parents has this trait. This makes long-lived heirs more rare if the ruler suffers from great pox.
It is needed to have a health level of at least 6 to recover from this disease. There is a chance to remove this disease by choosing the Theology focus.

Epidemic diseases[edit]

Epidemics begin with an outbreak in one province, and can spread through adjacent provinces on the first day of each month.

When a county is affected by an epidemic:

  • A dark green cloud appears over the city sprawl
  • Characters living in that province will randomly become infected. Characters who have already contracted and recovered from the disease are immune, with the exception of the great pox
  • City tax income is reduced
  • Supply limit is reduced, and attrition is greatly increased for troops in excess of the supply limit. These effects make warfare harder, especially when large armies are required or multiple diseases are present.

Rulers can protect themselves against epidemics by relocating their capital or by sending individual characters to other locations. Children aged 6-15 can be sent for education to other courts. Adults can lead troops or perform council missions in safer provinces. With DLC icon Reaper's Due.png The Reaper's Due, it is worth noting that only land provinces are safe: leading troops at sea while an epidemic ravages your capital is a sure way to contract Scurvy ; going into seclusion can be considered a viable alternative.

Conversely, sending a character to an infected location can serve as a quiet way to dispose of a rival or an unwanted heir.

Outbreaks always begin in coastal cities. Cities with higher income are at higher risk. A capital which is far inland may be safer. The Black Death historically arrives around 1300-1400 AD, though the player can change it on the game rules panel at the beginning of a campaign.

List of epidemic diseases[edit]

Epidemic Contagiousness Outbreak Duration Trait Effects Recovery MTTH
(for 45yo with 5 base health)
Tuberculosis epidemic.png Consumption
(AKA Tuberculosis)
30% 1.2% 30 months Tuberculosis.png -2 health 24 months
Typhoid fever epidemic.png Slow Fever
(Typhoid Fever)
30% 1.2% 30 months Typhoid fever.png -3 health, -10% fertility 4 months
Typhus epidemic.png Camp Fever
(Typhus)
50% 4% 10 months Typhus.png -4 health, -20% fertility 12 months
Bubonic plague epidemic.png The Plague
(Bubonic Plague, Black Death)
95% 1% 10 months Bubonic plague.png -7 health 3 months
Measles epidemic.png Measles 60% 3% 8 months Measles.png -2 health 5 months
Smallpox epidemic.png Smallpox 50% 8% 8 months Smallpox.png -3 health, -25% fertility 5 months
Smallpox epidemic.png Great Pox
(Syphilis)
50% 8%
(Dlc icon sunset invasion.png Sunset Invasion)
8 months Syphilitic.png -2 health, -20% fertility Recovery ONLY with Possessed trait

With Reaper's Due expansion[edit]

With DLC icon Reaper's Due.png The Reaper's Due active, the disease system becomes more complex. Characters will first contract symptoms which will then be diagnosed by their court physician. Hospitals can be built to fight epidemics at the province level and the epidemics also affect the level of prosperity in a county.

An infection can develop after being Wounded or Severely Injured . They can be dangerous as a court physician cannot treat this symptom; the player character may have to make up for the lost health by other means. However, it will heal on its own given enough time, just like other diseases. Counter-intuitively, an infection arising from being Severely Injured is less dangerous than the same trait arising from Wounded ; this is because the infection actually replaced Severely Injured (with no net health decrease), but is added on top of being Wounded .

Outbreaks[edit]

Outbreaks can begin in any province, and may spread through single ocean tiles. Infected provinces tend to lose prosperity and may experience its opposite: depopulation. Basic hospitals provide minor protection from depopulation.

Upgraded hospitals can also prevent the county from becoming infected. This makes them useful not only in your capital but also in provinces near your capital, especially at chokepoints such as the Grisons-Lombardy mountain pass.

Certain events may reduce a province's disease resistance: a smugglers' ring forming and refusal to pay for a hospital's upkeep. High prosperity also lowers disease resistance.

The Black Death is larger and more deadly, and gets a chance of major outbreak to occur 200 years into any game, regardless of start date. (This can be changed on the game rules panel.) After a major outbreak has happened, the disease becomes endemic and may break out again, but likely on a smaller scale. The Black Death has special patterns. It may miss India, Africa, Scandinavia, Britain, or the Steppes. It also has a chance to miss a discontinuous region called the Historical Plague Exclusion Zone. Once you see evidence of which regions it is skipping, try to move your capital there.

Epidemics can never spread to Iceland, because it does not share any sea zones. However, Iceland is a small duchy in a weak de jure empire, so moving your capital there may reduce both demesne levies and vassal levies. Iceland is also far from everything else, increasing the risk of independence factions.

Seclusion[edit]

Rulers receive the option to go into seclusion when an epidemic spreads to counties near their capital. Alternatively, rulers with the Paranoid trait can go into seclusion at any time. Rulers must be landed or patricians to shut the gates.

Once the option to go into seclusion is taken, the ruler is isolated together with their courtiers. All secluded characters receive a -5 penalty to their Diplomacy attribute, and can no longer lead armies (if previously able to) or perform jobs (if they are councilors).

If the period of seclusion is too long, negative events may occur, and may result in characters obtaining the Cannibal trait, becoming Craven and experiencing food shortages. The ruler can also kick out any courtier who displays any symptoms of disease. Seclusion may fail if a courtier is exposed to the outside world or contracts a disease before becoming secluded.

Upon opening the gates, the ruler gets the Abandoned the commoners modifier. While this modifier is active (1 year), they have -10 general opinion and cannot shut the gates again.

Symptoms[edit]

Name Command ID Diplomacy Martial Stewardship Intrigue Learning Health Opinions Other modifiers Possible diseases/Other remarks
Abnominal Pain Abdominal Pain abdominal_pain 215 -1 -10% Fertility Has Slow Fever Camp Fever Flu Dysentery Cancer
Chest Pain Chest Pain chest_pain 211 -2 -10 Personal Combat Skill Pneumonic Consumption Cancer
Cough Cough cough 207 -1 -0.25 -5 Attraction Pneumonic Consumption Measles Flu Cancer
Cramps Cramps cramps 212 -2 -0.5 -10 Personal Combat Skill Food Poisoning The Plague
Diarrhea Diarrhea diarrhea 209 -2 -2 -1 -5 Attraction -20% Fertility
-1 Personal Combat Skill
Has Slow Fever Camp Fever Flu Dysentery Food Poisoning Cancer
Fatigue Fatigue fatigue 216 -1 -1 -0.25 -20 Rationality Consumption Camp Fever Flu Gout Rabies Cancer
Fever Fever fever 208 -1 -1 -10% Fertility
-10 Personal Combat Skill
-10 Rationality
Pneumonic Has Great Pox Consumption Has Slow Fever Camp Fever The Plague Measles Smallpox Aztec Disease Flu Dysentery Gout Food Poisoning Rabies
Headache Headache headache 214 -1 -1 -1 -0.5 -10 Personal Combat Skill
-10 Rationality
Has Great Pox Camp Fever Smallpox Aztec Disease Flu Cancer
Infection Infection infection 218 -3 -3 -3 -3 -3 -2 -10 Attraction -10 Personal Combat Skill None
Can appear while Wounded or Severely Injured ;adds to Wounded but replaces Severely Injured
Malaise Malaise malaise 217 -0.75 Has Slow Fever The Plague Smallpox Aztec Disease Flu Rabies Cancer
Rash Rash rash 213 -0.5 -5 Attraction -10% Fertility Has Great Pox Camp Fever Measles Smallpox Aztec Disease
Vomiting Vomiting vomiting 210 -2 -2 -1 -5 Attraction -30% Fertility
-10 Personal Combat Skill
Flu Food Poisoning Cancer


Diseases[edit]

Name Command ID Diplomacy Martial Stewardship Intrigue Learning Health Opinions Other modifiers Miscellaneous Cost
Aztec Disease Aztec Disease has_aztec_disease 132 -3 -2 -2 -3 -2 -4 -10 Attraction
-5 General
-30 Personal Combat Skill
-20% Fertility
-3 Personal Combat Skill
Epidemic Epidemic (after Dlc icon sunset invasion.png Aztec arrival)
Camp Fever Camp Fever has_typhus 36 -1 -2 -1 -2 -4 -20% Fertility
-40 Personal Combat Skill
Epidemic Epidemic
Cancer Cancer cancer 230 -3 -20% Fertility More likely when old aged
Consumption Consumption has_tuberculosis 34 -2 -1 -2 -2 -25 Personal Combat Skill Epidemic Epidemic
Dancing Plague Dancing Plague dancing_plague 235 -1 -1 -1 -1 -1 -2 -25% Fertility Epidemic Epidemic (rare)
Dysentery Dysentery dysentery 226 -1 -1 -4 -15 Attraction -25% Fertility
-20 Personal Combat Skill
Flu Flu flu 225 -1 -1 -1 -1 -1 -2 -10 Attraction -10 Personal Combat Skill Common and brief
Food Poisoning Food Poisoning food_poisoning 228 -2 -2 -2 -2 -2 -3 -15 Attraction -50% Fertility
-10 Personal Combat Skill
Gout Gout gout 227 -2 -1 -2 -20 Personal Combat Skill
Great Pox Has Great Pox syphilitic 27 -1 -1 -1 -1 -1 -2 -10 Attraction
-5 General
-20% Fertility 10% Inherit Chance -44
Slow Fever Has Slow Fever has_typhoid_fever 35 -2 -1 -1 -3 -10% Fertility
-40 Personal Combat Skill
Epidemic Epidemic
Ill Ill ill 25 -1 -1 -10% Fertility
-10 Personal Combat Skill
With DLC icon Reaper's Due.png The Reaper's Due DLC, the Ill trait is replaced by symptoms
Leper Leper leper 28 -1.5 -15 Attraction
-20 General
-95% Fertility
-25 Personal Combat Skill
Measles Measles has_measles 38 -2 -1 -2 -10% Fertility
-30 Personal Combat Skill
Epidemic Epidemic
Pneumonic Pneumonic pneumonic 26 -2 -2 -2 -2 -2 -4 -50% Fertility
-35 Personal Combat Skill
Rabies Rabies rabies 229 -3 -2 -3 -2 -7 -20 Attraction
-5 Vassal
+30 Personal Combat Skill
-50 Rationality
Scurvy Scurvy scurvy 238 -1 -1 -1 -1 -1 -3 -20 Personal Combat Skill Gained when leading troops at sea.
More likely after 3 years at sea.
More likely when an epidemic is ravaging your capital
-35
Sickly Sickly sickly 144 -2.5 Children can be born sickly.
Removed between the ages of 2 to 6
Smallpox Smallpox has_small_pox 39 -2 -1 -2 -3 -25% Fertility
-100 Personal Combat Skill
Epidemic Epidemic
The Plague The Plague has_bubonic_plague 37 -2 -3 -2 -3 -2 -7 -50% Fertility
-100 Personal Combat Skill
Epidemic Epidemic (nearly mapwide, many special events)


See also[edit]