I was really excited for the addition of casus belli in Civ 6 for a couple of reasons. 1. I was hoping for a significant reduction in war monger penalties for "reasonable wars" such as defending allies or reclaiming stolen territory etc... It seems that the AI still needs adjusting in this regard. The game still devolves into a pit of denouncements. I think a flat war monger penalty is a problem. Different civs should react differently depending on the situation, not just based on the leader's personality. (perhaps they do and I haven't noticed?) For example, there should be little to no war monger penalty from civs that follow the same religion as you do when you use casus belli to declare a holy war on another civ that follows a different religion. Perhaps you should even get a boost in relations and increased likelihood in assistance from fellow believers. Another example might include larger powers penalizing you less for using war of expansion on lesser civs unless they are in their perceived sphere of influence. There are many potential ways that casus belli could be tuned to generate a more intelligent response from the AI that would better reflect the subtleties of the current game. 2. This was more of a long shot but I was hoping that it would be a way for the AI to understand you a little better. I am playing a game where Rome kept converting my cities despite promises not to so I used casus belli to declare a holy war. I razed a few of their cities, including their holy city, and took over 2 more cities including their capitol Rome. I then granted them peace. Literally the next turn, they were at it again. An apostle shows up and converts my city. I request for them to stop and I am right back to them not keeping their promises to stop converting my cities. They should know why I just decimated half of their empire because the casus belli I used should have been clear. Yet they immediately resume the behavior that they should know will lead to ruin. I would like to see the AI "learn" a bit more based on what I am clearly saying to them: "If you convert my cities I will destroy you". With little to no military left compared to the huge military presence I have very close to their borders, there should be no way that they would think converting my cities at this point is a good idea. I still have high hopes for the potential of casus belli. I think some fine tuning would go a long way.