Unlike in most wars, any territories belonging to either warleader that are occupied in a war using the Imperial Challenge wargoal are immediately annexed (by the other warleader) without any need to demand it in a peace, at the cost of 0.75 aggressive expansion (adjusted by the aggressive expansion impact modifier) and 0.30 war exhaustion per territory. The Imperial Challenge wargoal is also used by the special event A Chance to Strike for the 20px Parthian invasion of the Seleukid Empire and given as a reward against Carthage for one of the tasks of the Roman mission tree The First Provincia. Countries that are at the center of a horde invasion - the recipient of the Rise of the Dahae events and any country that forms 20px Yuezhi - will also get access to this wargoal against major powers and higher. This war goal is unlocked by the Winning Land by the Spear Oratory invention and can be used on any major power or great power.

Demanding territory with this war goal has a +1000% (11 times) warscore modifier for the attacker, making it very inefficient to use this casus belli for conquest. Ticking war score will apply if one side is blockading enemy territory while the other is not. This war goal is available as long as both the potential attacker and defender have a coast, even without a casus belli, and the objective is to show superiority in naval battles. Demanding territory with this war goal has a +150% (2.5 times) warscore modifier for the attacker, making it suboptimal to use this casus belli for conquest unless it is impossible to obtain a claim. Once over 10 war score from battles is achieved, the extra ticking war score will begin to apply. This war goal is always available, even without a casus belli, and the objective is to show superiority in battle. Demanding territory with this war goal has a -25% warscore cost reduction for the attacker, even for unclaimed territories. A conquest war will automatically end if the entire war goal is held by either party for 1 year + 180 days per rank - either a white peace if the defender has managed to completely hold it, or ceding the contested province to the attacker if they have managed to occupy it for long enough. The war goal is to completely control the province, and the attacker will only gain ticking warscore if they occupy every territory in the province, while the defender only needs to make sure they control at least one territory to gain ticking warscore for their side. If a country has a claim on a province held by another country, a conquest war can be declared over that province. There are several different war goals in the game: Not fulfilling it will give ticking warscore over time to the defending side, while a fulfilled war goal will instead give ticking war score to the attacking side. Inventions: Some casus bellis are unlocked after adopting certain inventions.Д®very war has a certain war goal defined by the casus belli used to start the war.Events: Certain special events allow a country to immediately declare war using cbs that they might not otherwise be able to get.Demanding Military Access: A country can declare war on another country if it refuses to grant military access.Broken Alliances: A country will receive a time limited casus belli against a country that dishonors its alliance towards them.Broken Subject Statuses: A country will receive a time limited casus belli against a country that breaks a subject relationship with them.Insults: A country will receive a time limited casus belli against a country that has sent an insult to it.Supporting Rebels: A country is always considered to have a casus belli against someone who supports rebels inside it.Claims: The most common casus belli, a country is considered to have a casus belli against another country if it has a claim on a territory that the other country owns.Casus belli come in a variety of forms, including:

Casus belli crusader kings 2