Mod «Novum Vexillum» for Hearts of Iron 4 (v1.10.1)


This project aims to be a modern era total conversion, starting where Millennium Dawn Classic left off. This mod will initially contain nearly all existing features in MDC, as well as several new features and many graphical improvements. Over time, this will diverge until the point in which all original features from MDC are replaced or overhauled. While we will be adding complex features, such as advanced economy and political systems, many of the significant gameplay changes are planned to be optional or low-impact. We understand many players of modern era mods prefer a military sandbox experience over geopolitical adventures, and we want to cater to both demographics, where possible.

Current Features:

  • Starting decisions for customizable gameplay;
  • Fully integrated and extended MTG naval tech tree;
  • Streamlined tech trees, including new carrier variants for fighters, attackers, and naval bombers;
  • Significant graphical enhancements and better tech icons;
  • About a dozen new decisions, with many more to come;
  • Newly balanced land units and vehicles;
  • Completely integrated fuel system;
  • New industry tech tree.


We have many planned and in-progress features on the way, as we expect the development time of this mod to be many months or years. Our end goal is to create an interesting and accurate depiction of modern geopolitics, international trade, social cohesion and unrest, and warfare. The plans which follow are not necessarily all that will be added, as there are too many to list here.

  • New focus trees to replace all existent ones;
  • Abstract economy and political systems;
  • Advanced internal politics;
  • Social cohesion and unrest;
  • National personalities, adding new possibilities for international conflict;
  • International trade and political agreements;
  • Realistic naval combat and configurations;
  • Extensively accurate vehicle and equipment icons and names;
  • Helicopters;
  • Interactive space program;
  • New 3D models for all in game units.

Mod checked on game version: 1.10.1

  • 1.10 Compatibility
  • Added new Pulling the Strings option to prevent the AI from splitting NATO
  • Reduced Iran’s tech slots from 4 to 3
  • Reduced all estate drift values

Version 11.07.20 for Hearts of Iron 4 (v1.9.3)

  • 1.9.3 Update
  • Moldova and Mongolia updated political info
  • Added cheat to allow all political actions for any ideology: “event cheat.100”
  • Re-added encryption and decryption techs for those without La Résistance


Version 29.05.20 for Hearts of Iron 4 (v1.9.2)

  • 1.9.2 Update
  • Tweaked tungsten in China
  • Added Syrian civil war and ISIS event to 2000 start date timeline
  • Merged with Novum Vexillum: More Ship Name Submod created by Ran Mitake
  • Added Yevgeny Dzhugashvili as communist leader to Georgia
  • US focus to establish a state religion now removes the First Amendment


Version 26.04.20 for Hearts of Iron 4 (v1.9.1)

  • 5% Authoritarian and democratic flip rate will now register as 0% if historical AI focuses is enabled
  • Bougainville Island is now part of Papua New Guinea instead of the Solomon Islands


Version 09.04.20 for Hearts of Iron 4 (v1.9.1)

  • 1.9.1 Compatibility
  • 2016 Start date is back
  • World tension decay has been reduced by 50%
  • Added world tension increase for using nuclear bombs
  • Added Austria-Hungary and Ottoman formable tags
  • Added decision for parliamentary republics and constitutional monarchies to hold snap elections
  • Set some sub-ideologies to never appear randomly
  • Increased cost of recon planes and decreased required numbers for operation, both by a factor of 10
  • Rebalanced UCAVs


Version 18.03.20 for Hearts of Iron 4 (v1.9.0 - 1.9.1)

  • 1.9.0 Husky compatibility
  • New wide octagonal format for the 12 national idea sets
  • New custom game rules to lock Pulling the Strings settings to prevent player trolling
  • Added self-propelled artillery
  • Added AWACS aircraft (Low IC value until rebalanced)
  • Added reformation of Yugoslavia for all former constituents

Due to errors caused by Paradox, there will be some missing localizations. These should be gone when 1.9.1 is released.


Version 24.11.19 for Hearts of Iron 4 (v1.8.0 - 1.8.1)

  • Compatibility update for Hoi4 1.8 Fork
  • Fixed number error in 2006 FIFA World Cup event description
  • Fixed error with aerial minelaying and minesweeping not applying to certain aircraft
  • Improved AI custom rule for Russia to establish the USSR
  • 3 New hidden events for UK name changes based on ownership of Ireland
  • New decision to replace complex country names with simple names
  • New decisions for games with disabled natural estate drift
  • New game rule to force China to go down their aggressive focus path
  • Fixed bug in Iceland’s focus tree where you couldn’t invite Finland to the alliance
  • Fixed PRC being taken over by Taiwan when reuniting, removing the better focus tree and ideas


Version 20.10.19 for Hearts of Iron 4 (v1.7.0 - 1.7.1)

  • New custom game rules for major nations, decide which focus path the AI will take
  • Improved Estate events
  • New aberrant fifth estate event triggers
  • Ideologues will reduce the frequency of aberrant fifth estate shifts of both types
  • Moved city of Kołobrzeg and added Słupsk
  • Reverted AI peace behavior
  • Minor AI peace adjustments
  • Added cheat events to change Estates, check FAQ for names and numbers
  • 3 Options added to event cheat.1095


Version 10.10.19 for Hearts of Iron 4 (v1.7.0 - 1.7.1)

  • New Russian equipment names and icons;
  • New random name pool for Korea and North Korea;
  • Reduced war justification time for extreme/warlike ideologies;
  • Fixed spelling mistake for mountaineer divisions;
  • Fixed numerical error in the “New Logistics” Italian focus.


Version 18.09.19 for Hearts of Iron 4 (v1.7.0 - 1.7.1)


How to install mod?

To install the mod for the game Hearts of Iron 4, unpack the contents of the archive to the folder Documents\Paradox Interactive\Hearts of Iron IV\mod and enable the modification in the launcher.

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Could the Novum Vexillum be update to version X0.67f it was last update on 26 april on steam workshop



Could you make a National Foucus in Czech and Slowak Focus Tree to Reunite Czechoslowakia Please.

Thanks ! 


The Mod Creator/Team are clearly focusing on the naval aspects of this mod which is fantastic but please do not go in to the direction of millennium dawn. It has a lot of stuff but it comes off as shallow. Please add a theocratic Ideology and a fundamentalist/Extremist religious ideology as opposed to Islamist. 


nice mod lol