Plagues of Nurgle
Nurgle's factions build their own plagues. A plague is 3 symptoms side by side in the symptom web, plus up to 3 mutations; it costs 200 Infections and goes onto one of your armies or settlements, or to a Plague Cultist who carries it to the enemy. Here is every symptom and mutation as the game's tables have them, patch 9.0.4.
How it works, in the game's numbers
- The plague panel opens after 200 Infections gained.
- A plague costs 200 Infections; a used symptom rests for 3 turns.
- The symptom web is reshuffled every 3 plagues created.
- At the start Liquifying is unlocked and Atrophied blessed (Ku'gath also Flaccid).
- A blessed symptom has stronger effects, shown under each symptom.
- The technology Come to Grandfather allows one more blessed symptom.
Blessed symptoms per faction
Ku'gath gains one more for every 10 ranks.
Battle symptoms (7)
Effects on infected armies and garrisons in battle.

Bleeding
Heart
Your forces
- Melee defence: +4
Blessed- Melee defence: +8
Enemies
- Melee defence: -4
Blessed- Melee defence: -8

Weeping
Ears
Your forces
- Armour: +15
Blessed- Armour: +30
Enemies
- Armour: -15
Blessed- Armour: -30

Violent
Sores
Your forces
- Missile resistance: 10%
Blessed- Missile resistance: 20%
Enemies
- Ammunition: -20%
Blessed- Ammunition: -40%

Necrotising
Pox
Your forces
- Melee attack: +4
Blessed- Melee attack: +8
Enemies
- Melee attack: -4
Blessed- Melee attack: -8

Sweating
Glands
Your forces
- Weapon strength: +10%
Blessed- Weapon strength: +20%
Enemies
- Weapon strength: -10%
Blessed- Weapon strength: -20%

Rotting
Tongue
Your forces
- Attribute: Vanguard Deployment for all units
Blessed- Attribute: Vanguard Deployment for all units
- Speed: +15%
Enemies
- Speed: -15%
Blessed- Speed: -30%

Shrunken
Lungs
Your forces
- Bound spell: "Fleshy Abundance" (Lord)
Blessed- Bound spell: "Fleshy Abundance" (Lord)
- Number of uses: +1 for bound spell: "Fleshy Abundance" (Lord)
Enemies
- Battle healing cap: -50%
Blessed- Battle healing cap: -100%
Army symptoms (6)
Effects on infected armies in the campaign.

Feverish
Skin
Your forces
- Winds of Magic power reserve: +5 per turn
Blessed- Winds of Magic power reserve: +10 per turn
Enemies
- Winds of Magic power reserve: -5 per turn
Blessed- Winds of Magic power reserve: -10 per turn

Acrid
Organs
Your forces
- Winds of Magic cost: -10% for all spells
Blessed- Winds of Magic cost: -20% for all spells
Enemies
- Winds of Magic cost: +10% for all spells
Blessed- Winds of Magic cost: +20% for all spells

Liquifying
Appendage· Unlocked at the start
Your forces
- Casualty replenishment rate: +10%
Blessed- Casualty replenishment rate: +20%
Enemies
- All units suffer attrition
Blessed- All units suffer attrition
- Attrition: +50% casualties suffered from all attrition

Inflamed
Eyes
Your forces
- Campaign movement range: +15%
Blessed- Campaign movement range: +30%
Enemies
- Campaign movement range: -15%
Blessed- Disables March, Tunnelling and Teleportation stances for the target
- Campaign movement range: -30%

Festering
Mouth
Your forces
- Recruitment health: +10% for all units
Blessed- Recruitment health: +20% for all units
Enemies
- Local recruitment capacity: -1 (local province)
Blessed- Local recruitment capacity: -2 (local province)
Festus the Leechlord has his own version:
Your forces
- Recruit rank: +1 for all units
Blessed- Recruit rank: +2 for all units
Enemies
- Local recruitment capacity: -1 (local province)
Blessed- Local recruitment capacity: -2 (local province)

Flaccid
Limbs· Ku'gath: blessed at the start
Your forces
- Upkeep: -15%
Blessed- Upkeep: -30%
Enemies
- Upkeep: +15%
Blessed- Upkeep: +30%
Settlement symptoms (5)
Effects on infected settlements.

Atrophied
Tongue· Blessed at the start
Your forces
- Growth: +25
Blessed- Growth: +50
Enemies
- Growth: -25
Blessed- Growth: -50

Leaking
Bowels
Your forces
- Nurgle corruption: +4
Blessed- Nurgle corruption: +8
Enemies
- Nurgle corruption: +4
Blessed- Nurgle corruption: +8

Dripping
Intestines
Your forces
- Cycle time: -1 for Basic Military buildings
Blessed- Cycle time: -1 for Advanced Military buildings
- Cycle time: -1 for Basic Military buildings
Enemies
- Construction time: +50% for all buildings
Blessed- Construction time: +100% for all buildings
Festus the Leechlord has his own version:
Your forces
- Construction time: -50% for all buildings
Blessed- Construction time: -100% for all buildings
Enemies
- Construction time: +50% for all buildings
Blessed- Construction time: +100% for all buildings

Swelling
Orifices
Your forces
- Construction cost: -15% for all buildings
Blessed- Construction cost: -30% for all buildings
Enemies
- Construction cost: +15% for all buildings
Blessed- Construction cost: +30% for all buildings

Crumbling
Brain
Your forces
- Income from all buildings: +10%
Blessed- Income from all buildings: +20%
Enemies
- Income from all buildings: -10%
Blessed- Income from all buildings: -20%
Mutations
| Mutation | Level 0 | Level 1 | Level 2 | Level 3 |
|---|---|---|---|---|
| DurationHow long a plague lasts on selected target | 3 turnsfree | 4 turns50 Infections | 5 turns100 Infections | 6 turns150 Infections |
| ImmunityDuration before a target can be infected by another plague | 5 turnsfree | 4 turns50 Infections | 3 turns100 Infections | 2 turns150 Infections |
| SpreadChance for plague to spread per target each turn | 25%free | 35%50 Infections | 45%100 Infections | 55%150 Infections |
Duration: how long a plague lasts on its target. Immunity: turns before a cured target can catch another plague. Spread: chance per target each turn (plague_parameters). Costs from each level's resource cost in Infections.
Source: plague_components, plague_component_setups (set nurgle_new; Festus: festus), plague_effect_setups, plague_effects, plague_parameters, plague_component_types, the Nurgle plague rituals' costs, and the campaign script wh3_campaign_nurgle_plagues.lua (panel unlock, starting and blessed symptoms, reshuffle), patch 9.0.4, from the WH3-Dump export. The twenty older named symptoms and the five recipes remain in the tables only in an unused test set.