I really like what they are doing with introducing a casus belli system to civ 6 and it seems to be something very interesting to use in a single player game. But I do wonder if the casus belli system has it's used for a multiplayer game. Like in a single player game you would get warmongering penalties which affects your diplomatic relationships with other AI, but if you for example played a game with only human players does this system have any other effect other then that? Cause pretty much nothing is going to stop any player to just declare surprise wars the whole game if that is the case. I really hope I'm wrong though cause I really do want the casus belli system to be just as important in a multiplayer game as it is in a single player game.