Major

• Major map revisions and additions: East Africa, Armenia, Central Asia, Siberia and India
• Added Steam matchmaking support
• Added Steam workshop support
• Added diplomatic range, blocking diplomacy and councillor actions vs too distant characters
• Factions will now revolt as a single unified realm under a temporary title
• Added attrition for units that have been "out-of-supply" for too long (can't live off the land in neutral counties, etc)
• Added support to change window mode setting: fullscreen, borderless or windowed
• New unit type system allowing for more flexible unit types, including War Elephants, Camel Warriors and Horse Archers
• Blocked "North Korea Mode"; you now lose huge parts of all income and levies if your demesne is too big
• Save games are now compressed by default (can be toggled on and off)
• Major memory and performance optimizations

Minor

• Added opinion malus for holding a character in prison.
• Added opinion malus for former lovers.
• Characters can now have up to five lovers at the same time.
• Tweaks and improvements to many events and decisions.
• Scripted civil wars in history files should now work properly. When scripting civil wars, defender must always be added before attacker for them to work properly.
• Now possible to revoke honorary titles. Revoking an honorary title with a positive opinion modifier will anger the previous holder.
• Added support for multiple lovers.
• Impregnation of lovers is now handled in the code.
• Updated all events to use the new scripting logic for friends, rivals and lovers.
• Characters will no longer get 'Marriage Ties' opinion bonus towards their spouse.
• Fixed a bug that was preventing vassals from being able to be called into war under certain CBs that were scripted to allow it.
• CBs that call other vassals into a revolt will now automatically call all vassals when war is declared.
• Sons asking for titles can now start an adventure for one of your titles if refused. Especially common among Muslims. (event 37000)
• Timur and Seljuk now arrive in a more involved fashion and need to survive before they launch their great gambit
• Children can no longer pick up the religion or culture of a guardian if the guardian does not share the religion or culture of his employer
• The Nestorians are no longer a heresy, and have their own holy order (The Order of St Addai)
• Added the Messalian heresy (Nestorian)
• Made the Paulician heresy (Orthodox)
• You can no longer usurp the sole primary title off of someone with a different religion if he has any holdings within it
• You no longer get an opinion bonus from your vassals for defending against rebels, adventurers and the like
• You can no longer call allies to help you defend against peasant, heretic and religious rebels
• Added a decision to conscript merchant ships if playing a ruler with overseas holdings
• Reduced piety gained from battles
• Increased piety cost of Muslim Invasion CB
• Whether a character is too insignificant for anyone to care if you execute them is now determined by whether they have any titles, claims, or titled close relatives
• Children, incapable characters and prisoners can no longer join factions
• The decision to acknowledge bastards as your own now works again
• Becoming infirm will now abort self improval ambitions
• Characters now lose the ambition to get married upon becoming eunuchs or homosexual
• Cathar women can now have the same career ambitions as men
• Can no longer reform the Orthodox religion, instead one has the Decision to restore the Ecumenical Patriarchate
• Events can no longer make tech points negative
• Fixed a rare crash related to loading savegames with events referring invalid characters
• Cathar vassals no longer have negative opinions for liege or liege's heir being female
• Expelling holy orders now blocks further Decisions towards them
• Holy Orders can no longer ask for the right to build castles in the lands of vassals of someone who has expelled them
• If a Holy Order is your vassal when you expel it, it will be set free
• Added missing decision to expel the Bektashi Order
• No longer possible to hire holy orders that you've expelled
• Reduced the number of standing troops of the Knights of Calatrava and Santiago
• After a successful decadence revolt, the new ruler only gets weak unpressed claims on vassals who choose independence
• Increased chances that vassals will choose independence after successful decadence revolts
• Doubled the Prestige that newborn characters get from their dynasty at birth
• Doubled the Prestige you get from the dynasty of your spouse when marrying
• Added missing de jure capitals to the Kingdom of Anatolia and the Duchies of Spoleto and Latium
• Added a prisoner age check to event 50010
• Added updated flags for titles within the Arabian, Mali and Byzantine de jure empires
• Fixed a couple of location triggers in Christian monastery events.
• Fixed bug in bookmarks reading of files
• Fixed duchies names not showing properly in de-jure duchy map mode
• Added Camel Warriors retinue type to Arabic culture
• Fixed crash bug when units die of attrition
• Tweaked max attrition just so slightly
• Improved the Sons of Abraham version of the heresy appearance event (SoA.4000)
• Strengthened adventurers in general
• The king of Jerusalem is no longer allowed to vassalize the Knights Templar or the Knights of St John if they are too powerful already
• Tweaked the cultural conversion events a bit, mainly to improve the special Mongol conversion factor
• Corrected the terrain in many provinces
• Fixed a bug where saves where primary title was dynamic didn't have CoA
• Fixed a bug that if the primary title was dynamic the character was not auto selected after loading
• Fixed a bug where kicking someone out of the lobby would make that character unselectable
• Fixed a bug where selecting a player in the outliner would sometimes navigate to an incorrect province
• Fixed a bug where map borders were not correctly loaded when going into multiplayer
• Fixed a bug where map names were not correctly loaded when going into multiplayer
• Cash, Prestige, and piety commands can now be used with values smaller than 1
• Text field cursor position fixed in multiple cases
• Fixed a bug where children would lose their guardian upon reload
• Fixed a bug where only a single opposite trait would be removed
• Famagusta is no longer an Abbasid vassal in 867
• Loot bar regrows more slowly now
• Fixed an issue where event flags would sometimes not clear properly after tournaments, feasts and similar events
• Fixed the triggers for a number of minor events where people could get the event even if they didn't have the correct religion
• Fixed broken trigger for the Decadent Warrior achievement
• Cut "succession wars" and all (mostly obsolete) mechanics to do with vassal revolt risk
• Jews can now also hire the Abyssinian and Nubian mercs
• Fixed a nasty bug where whole Patrician families could be genocided on succession
• Added events for the rise of the Ghaznavids
• Added a negative opinion modifier for vassal kings vs their emperor liege
• Improved or fixed religion triggers in many events
• Improved localization for a number of older events
• Minor tweaks to effects for many events
• Added a special decision to form the HRE
• Events are now saved and loaded from saves
• Compressed saves are now saved with meta data to improve performance
• Localisation of other languages now defaults to English
• Flags now appear and disappear when you're the correct height above the ground
• Saving the game with a dynamic title now saves the correct COA and automatically reselects the character you played upon loading
• Some minor changes to the save games format to improve backward compatibility
• Save games list now show if the save is unsupported
• Added equal-opportunity tumbling of courtiers for women and homosexuals.

Interface

• Family view now uses a larger siblings box if character's religion does not allow secondary spouses or concubines.
• The "Threats" tab in the Intrigue View is now filled with appropriate characters
• Added an "Adventurer Threat" alert (replacing the old "Angry Vassal" one)
• When choosing educate character for a child, a suitable guardian will now be pre-picked (for the cases where you don't want to bother to pick one yourself).
• Added a new tab to dynastic view that shows friends, rivals, in-laws and lovers.
• Religion/Culture filter in character finder now actually filters by religion/culture instead of religon/culture group.
• Pressing the skull icon will now navigate to the killer (if he is known)
• Court tab now shows councillors as well
• Improved a lot of title and culture colors
• Added opinion modifiers to the trait tooltip
• Fixed tooltips for trigger 'has_guardian' and 'has_regent'
• Corrected the tooltip for the trigger 'any_claim'
• Pressing on red character skulls now navigates to the murderer
• Character view now shows the correct piety icon for the selected character
• Expel Jormsvikings was missing localisation

AI

• Much less likely to plot against characters they have a high opinion of.
• Much less likely to form factions against characters they have a high opinion of.
• Improved guardian selection logic.
• More prio on converting demesne provinces over vassal provinces.
• Less willing to marry young male characters to older women.
• Will now detach and move away if their parent stack is suffering severe attrition.
• Will now keep attrition-free event troops mostly consolidated instead of spreading them out.
• Now takes terrain and unit quality into account when determining whether to run away from enemies.
• Smarter about when to assault if there are enemy troops nearby.
• Better at determining who to attach to in war.
• Better at coordinating with allies in war.
• Will no longer declare suicidal faction independence wars that only have a fraction of their liege's power.
• Now smarter about when to hire mercenaries in a war.
• Less willing to fold to independence, pretender and antiking factions.
• Will now never fold to a very weak faction.
• Will stop more plots.
• The Hordes will now be more prone to head in the "right" direction.
• Will now execute dynasty decisions.
• Smarter about title revocation.
• Will not start claimant factions for old women, or a parent of the current ruler.
• Muslim characters are more likely to pick up the 'Gain a Title' ambition.
• Foreign rulers are now generally quite willing to take on wards as hostages

Modding

• Added support for multiple lovers.
• Can now block minor titles from being revokable.
• The faction power level at which you get a warning alert is now scriptable.
• Now possible to script vassal_opinion, liege_opinion and sex_appeal_opinion into modifiers.
• Now possible to mod whether character interactions require a character to have their cost in prestige/piety on hand to use the interaction.
• Now possible to mod out character interactions entirely through defines.
• Added new define NOT_SPOUSE_FERTILITY_MULT that governs impregnation chance between non-married lovers.
• Added new define MARRIED_LOVERS_FERTILITY_MULT that governs impregnation chance between married lovers.
• Added triggers num_of_lovers, num_of_spouses, num_of_consorts, is_lover.
• Added scopes random_consort, random_lover, any_lover.
• Friends and rivals can now be added and removed with add_friend, add_rival, remove_friend and remove_rival.
• is_friend and is_rival now check correctly against rival/friend rather than high/low opinion.
• pacifist in religion groups is now called ai_peaceful.
• pacifist=yes in religions now denotes religions with decreased aggression and stable realms. Only works on Jain religion if player does not own Rajas of India.
• pacifist=yes in script now checks if character belongs to a pacifist religion.
• Can now script AI conversion behaviour for religions & religion groups.
• Added MAX_JOINED_FACTIONS to defines, sets how factions a character can be a part of (including led ones).
• Added scriptable static modifiers for characters of different ages(0-15, 16-19, 20-29, 30-49, 50-69 and 70+).
• Added allow_join to factions, this restricts whether characters can join factions.
• Added peace_piety_gain for religions
• Added designated heir functionality
• Added flag 'feminist = yes' to religion scripts (defines that a religion is not prejudiced against female rulers).
• Added trigger 'is_lowborn'
• Added trigger 'num_of_dynasty_members'
• Added the ability to change the name of piety for religions.
• Added real_tier, lower_real_tier_than, higher_real_tier_than triggers. These work like a regular tier check except that they ignore temporary titles.
• Added peace_piety_gain for religions
• Added designated heir functionality
• Mercenaries have now been moved to their own script file
• Implemented scriptable troop types.
• Fixed portage crash bug.
• Support for ocean to ocean rivers.
• Added a 'character_modifier' to religions
• Added a 'character_modifier' to cultures
• Added character_modifier for religions
• Can now define ranges of sea zones to make life easier.
• Can now define seperate oceans to help the pathfinding.
• Added trigger 'has_overseas_holdings'
• Added 'Player' text promotion
• Added trigger 'is_within_diplo_range'
• Added 'de_jure_counties' console command (shows a map mode)
• Added a 'manifest_destiny_invasion' CB for various special cases
• Fixed some issues with marriage texts, the 'on_marriage' action and modding
• Added effect 'copy_random_personality_trait'
• Added 'reincarnated' trigger
• Added effect 'set_reincarnation'
• Added event target 'reincarnation'
• History action 'add_matrilineal_spouse' now has been fixed
• Added error logs for incorrectly scripted birth and death dates
• Added handling and error logs of incorrectly scripted mothers and fathers (fixes certain crashes)
• Added 'secondary_event_pictures' to religions and culture
• Added trigger 'can_copy_personality_trait_from'

Converter

• Color table for converter is now in 0-255 range instead of 0-1
• Color table for converter can now script per CK2 title tag as well
• Key provinces of Europe is now scriptable
• Border provinces of Europe is now scriptable