A coronation system, which requires feudal kings and emperors to hold a coronation - an event which invites not only vassals but nearby independent rulers and relatives - which will solidify their rule.

A deceptive ruler may attempt to take their captive when they arrive and offer you them to you in exchange for a hefty ransom. Only if they raise sufficient funds will they be able to form a host, and the size of the host will depend on the amount of coin they raised as well as their individual prowess.

A more logical system for adventurers - adventurers will travel around to nearby kingdoms, attempting to raise money from sympathetic rulers and by campaigning in lands.

There are brand new heresies, such as the Adoptionists and Tondrakians (amongst others), and many individual heresies have been given a great deal of unique content to make them more interesting to play.

Overhauled heresies - conversion to heresies is not completely random, and sometimes 'heretics' will actually switch to non-heretic religions within the same religion group (where it makes sense).

Player needs to be a Nahua Aztec Count on Atlantic coast(not Scandinavia or Iceland) on game start.

German and Italian cultures are split to their historical variations which can be united though special decisions and events by powerful imperial rulers.

Likewise, powerful rulers who are part of very large dynasties but who not the head of that dynasty (and not closely related to him) may elect to start their own - particularly if they are Muslim, who will always start their own dynasty if not in the realm of thier dynasty head.

A cadet system for younger brothers of very large dynasties to establish their own dynasties if they should ever inherit a title.

The schism only occurs after the millenium if the right events occur prior to that, and can be prevented should a Patriarch Supreme be anointed.

Catholic and Orthodox religions are united as Chalcedonian Christianity in the Old Gods, Charlemagne and Millenium bookmarks.

These civil wars can be incredibly dangerous, as other factions can join in the war if the liege is unpopular.

A completely overhauled factions system - rather than solely having factions which go to war with their liege as soon as they are strong enough, there are also 'common interest' factions which consist of vassals who meet regularly and can reward a liege who's kept them happy or make demands of a liege with whom they're angry.and who can start a civil war if their liege doesn't comply.

Ck2 absolute tribal organization