Casus Belli

Aside from claims, make tributary, faction cbs, vassal-liege cbs and excommunicated ruler, the Seven Kingdoms mod removes all the vanilla casus bellis and adds 3 unique casus bellis. An exception is made for Beyond The Wall old Gods and White Ones, who still use vanilla holy wars and vanilla pagan conquest for some reason. This might be due to a bug.

County Conquest
The County Conquest cb is usable by any ruler against other adjacent independent rulers and costs 50 prestige to use. Content characters can't use this cb. Upon winning, the attacker usurps the targeted county, if the target is of a different religion, the holdings will also be usurped. It incurs a 5 year truce.

Coastal County Conquest
Some rulers can use county conquest on any coastal county. The ruler must be either:
 * Drowned God Religion group
 * Iron Islander Culture group
 * Pirate culture
 * Primary title is: Empire of the Iron Islands, Kingdom of the Iron Islands, Kingdom of the Shields, Kingdom of Evenstar, Kingdom of the Arbor, Kingdom of the Sisters, Kingdom of Fair Isle, Kingdom of the Stepstones, Kingdom of Andalos, Kingdom of Stone, Kingdom of Dragonstone, Duchy of Dragonstone, County of Dragonstone, County of Driftmark

Duchy Invasion
Rulers who are higher than Duke-tier can use this cb against other independent adjacent rulers. Content characters can't use this cb. It costs 500 prestige to use. Upon victory, it subjugates the target duchy(vassalize if possible, usurp if they hold land outside target duchy). It incurs a truce of 5 years.

Kingdom Subjugation
This cb can be used by kings against kings or lowers, and can be used against any ruler by an emperor as long as the target is adjacent. Content characters can't use this cb. It costs 1500 prestige to use and the ruler must have at least one of these traits: Upon victory, the attacker subjugates the target kingdom, usurping equal rank titles, vassalizing if possible, usurping titles of rulers who hold titles outside of the target. The newly vassalized rulers get +40(Subjugated) opinion bonus on the subjugater. It incurs a truce of only 1 year.
 * Brilliant Strategist
 * Ambitious
 * Sociopath