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There are several CBs based around changing realm laws, both crown and succession law. When pushing a vassal's claim and losing you'll have to pay concessions. If you win you'll gain the county as a vassal, or if you were pushing the de jure claim for someone else they'll gain the county as a vassal, have their opinion of you increased by 100, and you'll gain 100 prestige. Losing a war merely means a loss of 200 prestige, while you'll still keep the de jure CB. Unlike regular claims, de jure claims cannot be lost unless you lose control of the duchy. Even if the other realm holds more than one county you can only push a single de jure CB at once. If you or a vassal hold a duchy, where part of this duchy is owned by another independent realm, you can push a de jure claim upon one of the counties held by the other realm. If the claimant loses he or she loses the claim they pressed, some gold and some prestige, and the successful defender gains some gold and some prestige. If white peace occurs the claimant loses prestige and the defender gains prestige.
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If the claimant wins he or she will gain the contested title, plus some prestige, and the loser will lose prestige. Kingdoms and empires do not provide de jure CBs. Even if the other realm holds more than one county/holding you can only push a single de jure CB at once. If you or a vassal hold a duchy or county, where part of this duchy/county is owned by another independent realm, you can push a de jure claim upon one of the counties/holdings held by the other realm.