This is the hub for Millennium Dawn’s unique systems. The custom modifier reference lives here; scripted effects, how-to guides, and the deeper subsystems each have their own page, linked below.

Note: This is not fully up-to-date. For the latest systems, check the codebase directly.

Quick Reference

Custom Modifier Categories

The full modifier tables are on this page:

Economic Modifiers - Money, taxes, productivity, trade
Law Modifiers - Government spending, law costs
Migration Modifiers - Population migration
Influence Modifiers - Foreign influence mechanics
Energy Modifiers - Power generation and consumption
Political Modifiers - Party popularity mechanics
Counter-Terror Modifiers - Counter-terrorism
Missile & Space Modifiers - Missile/satellite production
Nation-Specific Modifiers - Country unique modifiers

Scripted Effects

Effect snippets (treasury, debt, buildings, factions, influence, party management) live in the Scripted Effects Reference:

Building Effects - Add buildings with costs
Economic Effects - Treasury, debt, productivity
Internal Faction Effects - Faction opinions
Influence Effects - Influence actions
Political Effects - Party management
Special System Effects - EU, Energy, Cartels

How-To Guides

Scripted Effects Reference - the full effects library and how-to guides
Dynamic Modifiers - applying modifiers through tooltips and dynamic systems
Code Stylization Guide - formatting and code structure
Search Filters - focus search_filters reference

Modifiers

Modifiers in Millennium Dawn follow standard HOI4 syntax but include many unique economic, political, and energy systems.

Economic Modifiers

These modifiers affect the economy, taxes, trade, and productivity.

General Economic

Modifier	Description	Notes
`interest_rate_multiplier_modifier`	Adjusts interest rate	Whole numbers only
`personnel_cost_multiplier_modifier`	Military wages
`army_personnel_cost_multiplier_modifier`	Army wages
`navy_personnel_cost_multiplier_modifier`	Navy wages
`airforce_personnel_cost_multiplier_modifier`	Airforce wages
`equipment_cost_multiplier_modifier`	Equipment upkeep
`bureaucracy_cost_multiplier_modifier`	Bureaucracy spending
`police_cost_multiplier_modifier`	Police spending
`education_cost_multiplier_modifier`	Education spending
`health_cost_multiplier_modifier`	Healthcare spending
`social_cost_multiplier_modifier`	Social spending
`tax_rate_change_multiplier_modifier`	Tax law change PP cost
`projects_cost_modifier`	Economic project costs
`civ_facs_worker_requirement_modifier`	Civilian factory workers
`mil_facs_worker_requirement_modifier`	Military factory workers
`offices_worker_requirement_modifier`	Office workers
`agriculture_district_worker_requirement_modifier`	Agriculture workers
`microchip_plant_worker_requirement_modifier`	Microchip plant workers
`composite_plant_worker_requirement_modifier`	Composite plant workers
`synthetic_refinery_worker_requirement_modifier`	Synthetic refinery workers
`buildings_worker_requirement_modifier`	All building workers
`tax_gain_multiplier_modifier`	All tax income
`population_tax_income_multiplier_modifier`	Population taxes
`corporate_tax_income_multiplier_modifier`	Corporate taxes
`return_on_investment_modifier`	International investment ROI	Use decimals (0.02 = 2%)
`productivity_growth_modifier`	National productivity	Keep small to avoid snowballing
`state_productivity_growth_modifier`	Per-state productivity
`country_productivity_growth_modifier`	Country productivity growth
`international_market_income_modifier`	Equipment sales income
`international_market_purchase_modifier`	Equipment purchase costs
`inflation_cost_multiplier_modifier`	Inflation costs

Exports & Resources

Modifier	Description
`resource_export_multiplier_modifier`	All resource exports
`oil_export_multiplier_modifier`	Oil exports
`steel_export_multiplier_modifier`	Steel exports
`aluminium_export_multiplier_modifier`	Aluminium exports
`tungsten_export_multiplier_modifier`	Tungsten exports
`chromium_export_multiplier_modifier`	Chromium exports
`rubber_export_multiplier_modifier`	Rubber exports
`microchip_export_multiplier_modifier`	Microchip exports
`composite_export_multiplier_modifier`	Composite exports

Industry Productivity

Modifier	Description
`agricolture_productivity_modifier`	Agriculture productivity
`microchip_plants_productivity_modifier`	Microchip plant productivity
`composite_plants_productivity_modifier`	Composite plant productivity
`synthetic_refinery_productivity_modifier`	Synthetic refinery productivity
`civilian_factories_productivity`	Civilian factory productivity
`military_factories_productivity`	Military factory productivity
`dockyard_productivity`	Dockyard productivity
`offices_productivity`	Office productivity

Industry Income Taxes

Modifier	Description
`office_park_income_tax_modifier`	Office tax income
`agriculture_district_income_tax_modifier`	Agriculture tax income
`microchip_plant_income_tax_modifier`	Microchip plant tax income
`composite_plant_income_tax_modifier`	Composite plant tax income
`synthetic_refinery_income_tax_modifier`	Synthetic refinery tax income
`dockyard_income_tax_modifier`	Dockyard tax income
`military_industry_tax_modifier`	Military industry tax
`civilian_industry_tax_modifier`	Civilian industry tax
`agriculture_tax_modifier`	Agriculture tax
`microchip_plant_tax_modifier`	Microchip plant tax
`composite_plant_tax_modifier`	Composite plant tax
`synthetic_plant_tax_modifier`	Synthetic plant tax

Campaign Costs

Modifier	Description
`salafist_outlook_campaign_cost_modifier`	Salafist campaign cost
`nonaligned_outlook_campaign_cost_modifier`	Nonaligned campaign cost
`western_outlook_campaign_cost_modifier`	Western campaign cost
`emerging_outlook_campaign_cost_modifier`	Emerging campaign cost
`nationalist_outlook_campaign_cost_modifier`	Nationalist campaign cost
`propaganda_campaign_cost_modifier`	Propaganda campaign cost

Investment Modifiers

Modifier	Description
`investment_duration_modifier`	Your project duration
`receiving_investment_duration_modifier`	Foreign project duration
`investment_cost_modifier`	Your project costs
`receiving_investment_cost_modifier`	Foreign project costs
`internal_investments_pp_cost_modifier`	Internal investment PP cost
`internal_investments_money_cost_modifier`	Internal investment money

Workforce & Labor

Modifier	Description
`total_workforce_modifier`	Total workforce
`high_unemployment_threshold_modifier`	Unemployment threshold
`agriculture_workers_modifier`	Agriculture workers %
`resource_sector_workers_modifier`	Resource sector workers %
`gdp_from_resource_sector_modifier`	GDP from resources
`border_control_multiplier_modifier`	Border control effectiveness
`civilian_chip_consumption_modifier`	Civilian microchip use
`industry_chip_consumption_modifier`	Industry microchip use

Upgrade & Special Costs

Modifier	Description
`econ_cycle_upg_cost_multiplier_modifier`	Economic cycle upgrade cost
`cyber_cost_multiplier_modifier`	Cyber system cost

Education

Modifier	Description
`literacy_rate_education_modifier`	Literacy/education rate

Law Modifiers

These modify political power costs for changing government laws.

Modifier	Description
`expected_adm_modifier`	Bureau/Government spending
`expected_police_modifier`	Internal Security spending
`expected_education_modifier`	Education spending
`expected_healthcare_modifier`	Healthcare spending
`expected_welfare_modifier`	Social Spending
`expected_mil_modifier`	Military spending
`corruption_cost_factor`	Corruption change cost
`economic_cycles_cost_factor`	Economic cycle change cost
`internal_factions_cost_factor`	Internal faction change cost
`bureaucracy_cost_factor`	Bureaucracy change cost
`trade_laws_cost_factor`	Trade law change cost
`Conscription_Law_cost_factor`	Conscription change cost
`migration_rate_value_factor`	Migration law cost

Migration Modifiers

These affect population migration.

Modifier	Description
`base_migration_rate_value`	Base migration rate (law only)
`maximum_migration_rate_value`	Maximum migration rate (law only)
`migration_rate_value_factor`	Migration rate multiplier

Influence Modifiers

These affect the foreign influence system.

Modifier	Description
`foreign_influence_modifier`	Influence action effectiveness
`foreign_influence_defense_modifier`	Defense against influence
`foreign_influence_auto_influence_cap_modifier`	Auto-influence slots
`influence_coup_modifier`	Coup success rate
`foreign_influence_continent_modifier`	Cross-continent influence
`foreign_influence_home_continent_modifier`	Home continent influence
`foreign_influence_monthly_domestic_independence_gain_modifier`	Monthly independence gain
`foreign_influence_monthly_domestic_independence_gain_factor`	Independence gain factor

Energy Modifiers

These control power generation and consumption.

General Energy

Modifier	Description
`energy_gain`	Flat energy gain
`energy_gain_multiplier`	Percentage energy gain
`energy_use`	Static energy use
`energy_use_multiplier`	Total energy consumption
`renewable_energy_gain`	Renewable energy specifically
`renewable_energy_gain_multiplier`	Solar/wind energy multiplier
`resource_storage_gain`	Energy storage gain

Population Energy

Modifier	Description
`pop_energy_use_multiplier`	Population energy use
`non_electric_fuel_consumption_modifier`	Direct fuel consumption

Fossil Fuels

Modifier	Description
`fossil_energy_gain`	Fossil fuel energy gain
`fossil_pp_energy_generation_modifier`	Fossil fuel plant output
`fossil_fuel_consumption`	Fossil fuel consumption
`fossil_pp_fuel_consumption_modifier`	Fossil plant fuel use

Nuclear Energy

Modifier	Description
`nuclear_energy_gain`	Nuclear energy gain
`nuclear_energy_generation_modifier`	Nuclear reactor output
`nuclear_fuel_consumption`	Nuclear fuel consumption
`nuclear_fuel_consumption_modifier`	Nuclear fuel use multiplier

Building Energy Use

Modifier	Description
`energy_use_modifier_civs`	Civilian factory energy use
`energy_use_modifier_mils`	Military factory energy use
`energy_use_modifier_offices`	Office energy use
`energy_use_modifier_agriculture_district`	Agriculture energy use
`energy_use_modifier_microchip_plants`	Microchip plant energy use
`energy_use_modifier_composite_plants`	Composite plant energy use
`energy_use_modifier_synthetic_refinery`	Synthetic refinery energy use

Renewable Infrastructure

Modifier	Description
`hydroelectric_energy_storage`	Hydroelectric storage
`hydroelectric_power_generation_modifier`	Hydroelectric output
`geothermal_power_generation_modifier`	Geothermal output
`state_renewable_capacity_factor_modifier`	State renewable capacity
`state_renewable_energy_generation_modifier`	State renewable generation

Battery & Storage

Modifier	Description
`battery_park_construction_cost`	Battery park costs
`battery_park_storage_size_modifier`	Battery storage size

Political Modifiers

These affect internal politics.

Modifier	Description	Notes
`popularity_attack_modifier`	Party attack effectiveness	Not percentage (2.0 = 2x)
`popularity_boost_modifier`	Party boost effectiveness	Not percentage (2.0 = 2x)

Counter-Terror Modifiers

These affect the counter-terrorism system.

Modifier	Description
`terror_threat_detection_modifier`	Threat detection chance
`terror_threat_base_detect_modifier`	Base detection value
`terror_threat_base_defense_modifier`	Base defense value

Missile & Space Modifiers

These affect missile and satellite production.

Modifier	Description
`olv_production_speed_modifier`	Orbital launch vehicle
`gnss_production_speed_modifier`	Navigation satellites
`comsat_production_speed_modifier`	Communications satellites
`spysat_production_speed_modifier`	Spy satellites
`killsat_production_speed_modifier`	Kill satellites
`nuclear_reactor_fuel_production`	Nuclear fuel production (base, kg/week)
`nuclear_reactor_fuel_production_factor`	Nuclear fuel production factor (percentage multiplier)

Nation-Specific Modifiers

Czech Republic

Modifier	Description
`CZE_skoda_superb_productivity_modifier`	Škoda productivity

Italy

Modifier	Description
`ITA_ageing_population_drift_modifier`	Aging population drift
`ITA_reform_expectance_drift`	Reform expectation drift