I have an idea for a new type of casus belli. From what I've been reading about medieval history, many wars were fought over personal matters, such as some sort of slight. So there should be another kind of casus belli, which I think has been implemented in the Elder Kings mod. Certain actions will be considered insults, such as divorces, excommunications, killings, imprisonments, that kind of thing. If a character commits an insulting action on another character, the victim and their relatives and friends will receive an honor casus belli on the offender and their liege, which can be of two types. The first type, a minor slight, such as imprisonment or verbal insult, will allow those receiving the casus belli to demand a certain amount of gold for compensation relative to the offender's base income. The second type, a major slight, such as the killing of a relative or friend, will allow the user of the casus belli to imprison the offender, whether they be a landed noble, or a minor courtier, to do with them what they wish, and a possible sum of gold for compensation from the person on whom war was declared, unless that person was the offender, in which the gold would be demanded from their heir. A succesful execution of the major casus belli might also result in the deposation of the offender.