In the grand strategy game Europa Universalis IV, vassalizing a nation is one of the most powerful tools at your disposal. Here’s how to do it. Vassalizing a nation in Europa Universalis IV is one of the most powerful tools at your disposal. It allows you to control their policies and resources, and can even lead to them becoming your puppet state. Here’s how to do it.

  1. Start by selecting a target nation in your empire. They’ll be highlighted in blue on the world map, and you can see their stats and modifiers below their name.
  2. Click on the “Vassalize” button next to their name (it looks like a crown). This will open up a dialogue box where you can specify what kind of relationship you want with them: full vassal, partial vassal, or tributary. You can also choose whether or not you want them to become a republic after being vassaled.
  3. Once you’ve made your choices, click “OK” to close the dialogue box and start the process of making them your vassal state. They’ll start off as a tributary state, but over time they’ll gradually become more loyal to you (and less loyal to their original country). ..

Offering it diplomatically to willing nations Demanding it in war Completely conquering a nation and then releasing them

Method 1: Offering Vassalization

Independent nations can be vassalized diplomatically if:

They have less than 100 development They’re allied with you They have at least 190 opinion of you They must be at peace You don’t own any of their core provinces

Most importantly, they must be willing to become your vassals.

The best way to check this is by using the Production Interface:

Open the Production Interface (hotkey: b) Go to the Diplomacy tab (hotkey: 0) Switch to the Influence actions sub-tab (hotkey: d) Select the “Offer Vassalization” action Choose a nation to vassalize

Vassalization Acceptance

Before you woo a nation and start improving your relations, you should first check if they’ll accept your offer.

In the Production Interface, you’ll see a list of nations and how likely they are to become your vassals.

Hover over each of them to check what’s stopping them from becoming your vassal.

To get them to become willing prospects, all you need to do is add more positive modifiers and remove the negative ones.

Here’s a list of things that can affect vassalization acceptance:

Method 2: Demanding Vassalization

In wars where you’re allowed to take provinces, you also have the option to force an enemy to become your vassal.

This peace term becomes available when you’ve occupied an enemy’s capital. Allies of the enemy war leader can also be vassalized this way.

Nations vassalized in war will have a -200 opinion modifier against you. This decays by 1% per month.

The costs for doing this depends on the loser’s development.

1% War Score per 2 Dev 0. 5 Diplo Mana per 1 Dev 0. 5 Aggressive Expansion per 1 Dev

Since wars are limited to 100% war score, you can only vassalize a nation with no more than 200 development.

However, you can negate the mana cost as well as reduce the AE impact and war score cost with these specific CBs:

Method 3: Releasing a Conquered Country as a Vassal

When a nation only has a few provinces left, it’s better to fully conquer them and then release them as a vassal. This lets you bypass the negative opinion modifier.

Here’s how to do it:

Right-click on your own provinces to open your Diplomacy view Press the “Create Subject” button in the lower-right Scroll all the way down to find your recently conquered foe