Original Guide by GamerBlurb.com | Published on 11/04/2025 at 11:23 PM CST
Europa Universalis V
When you want to expand in Europa Universalis V, you can’t just declare war for fun. You need a Casus Belli, the game’s built-in reason for conflict. It’s tied to Parliament now instead of basic spy actions, making it more political than ever.
How To Get Casus Belli
Open your Government tab and head to Parliament. Look for a proposal to Fabricate Claim or to declare a hostile stance. Approve it by spending Spy Network points and government power. When the motion passes, the Casus Belli appears under Diplomacy for the target nation.
Attacking without one wrecks your Stability, spikes War Exhaustion, and tanks your reputation. The game heavily punishes blind aggression, especially early on.
Main Ways To Gain Casus Belli
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Pass a Fabricate Claim or Declare Hostile proposal through Parliament
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Unlock temporary claims from scripted events like the Hundred Years War or Rise of the Turks
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Earn religious or ideology-based Casus Belli from estate policies or societal values
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Gain unique CBs from missions, character stories, or government reforms
Key Details On Claim Creation
Fabricating a Casus Belli through Parliament costs 20 Spy Network points. The wargoal changes based on the type. Conquest lets you seize land, Subjugation forces vassalage, and religious CBs push faith conversions. Each Casus Belli expires after roughly four years if unused.
Event-based ones like Claim Throne still exist but may bug out at times. Some players can’t trigger union options even when the CB is valid. The game now ties these systems more tightly to political power instead of just spywork.
Final Blurb
Casus Belli in Europa Universalis V turn war planning into a political game of timing. Managing Parliament and Spy Networks keeps your conquests legitimate and your empire stable. Rushing in without cause might win land, but it’ll cost your crown its sanity.
FAQ
How do I create a Casus Belli in EU5
Open Government, enter Parliament, and pass a Fabricate Claim or similar proposal. When it’s approved, you’ll gain a valid Casus Belli.
Do Spy Networks still matter
Yes, you still need at least 20 Spy Network points to fund a claim through Parliament.
How long does a Casus Belli last
Usually about four years before it expires.
Why doesn’t Claim Throne work
It’s a known issue where event-based Claim Throne Casus Belli don’t trigger the personal union option properly.
What happens if I declare war without one
You’ll lose Stability, gain Antagonism, and suffer extra War Exhaustion. Not worth it unless you enjoy rebuilding broken empires.
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