Normally when you are looking at declaring war you get a tip telling how severe your Warmonger penalty will be for this declaration.

However, when an ally asks you to declare a Joint War, you get no such information (or at least I failed to spot it).

The last time I did this I immediately received a denouncement for being a warmonger, so I assume there is a reasonably high warmonger penalty for it?

Does anyone know how big this penalty is? Is it based on the Casus Belli of the ally asking you to join? Is it just the standard Formal War penalty?

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    The fun part of this is, the country asking you to join them also gives you a warmong penalty that is super high. Your friend asks for help in a war against evil Spain and then denounces you three turns later for being a warmonger. I love Civ6 but their warmonger status needs work :/.
    – Andy
    Oct 31, 2016 at 14:31
  • Yep, Washington asked me to help him against India, and then while I was driving the Indians out of his lands, he denounced me. Nov 10, 2016 at 21:45
  • @Andy. Hilarious! Sounds pretty much like how the UN works...
    – smci
    Jul 8, 2020 at 9:10

1 Answer 1


The Civilization VI ‘Fall 2016’ seems to have changed how the Warmonger penalty works:

"Reduced Warmonger penalties in most instances, and adjusted how this reacts to returning versus keeping a city. The last city conquered from a player now provides a heavy warmonger penalty, even if you have a Casus Belli against this player, because you are wiping out a civilization."


"Players will no longer receive any warmongering penalties from a joint war partner for actions in that joint war."


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    Still doesn't tell me how big the penalty itself is, only that it no longer applies to your joint war partner, but good to know. Dec 2, 2016 at 5:39
  • It seems to vary by civ, and probably by "age" as well, but it seems to be about 20 warmonger points for me.
    – Alan H.
    Mar 26, 2018 at 4:05

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