Crusader Kings III Patch Notes

Patch 2026-09-29 September 29, 2026

  • Anathema - representing the weight of Sin, more dissonant choral/organ textures, while still grounded in the origin of expected tone and texture.
  • Sanctos - “Divine Ecstasy” and the grandeur of the “Lateran Throne Room”, borrowing from Léonin/Pérotin influence.
  • The Conclave - capturing the “mayhem” of the political Church, inspired by the complexity of the Ars Nova (motet style), with interwoven voices representing the debate.
  • Council’s Judgement - covers two distinct outcomes set for the end of an Ecumenical Council. A little sinister undertone, judgement, meandering the unknown result (tonally).
  • Deus Hoc Vult - for the completion of “Grand Cathedral” Great Project, triumphant, a “Hallelujah” moment, full choirs and bells celebrating the architectural progression.
  • The Shepherd’s Flock - sets the scene for the state of Christendom in 876/1066, nostalgic but with a hint of political tension.
  • Add/remove counties to/from a region
  • Split/merge/create a region
  • The domicile is bonded to the clerical region, which means, unlike other Domicile titles (they accept government), create_clerical_region accepts domicile_type as input.
  • Single Event Override: Added id_override_priority property to events, which allows overriding an event without having to replace the full file.
  • Added grandchild and great_grandchild character lists
  • Added real_parent, real_grandparent and real_great_grandparent character lists
  • Added on_trait_gained and on_trait_lost on_actions
  • Added effects for removing parents: clear_father, clear_mother, clear_real_father & clear_real_mother
  • Added on_character_created on_action that fires whenever a character is directly created, as opposed to born
  • Added triggers days_since_birth, birth_date, day_of_year_of_birth, month_of_year_of_birth and day_of_month_of_birth
  • Added on_liberation_siege_completion on_action
  • Added `set_faith_name` and `set_rite_name` effects
  • Made the reason for death be passed directly to `on_death` on_action as a scope!
  • Added `on_player_character_change` on_action
  • Added `create_domicile_title` effect, which allows you to create a dynamic title with a domicile, not tied to any vanilla government type
  • Added scripted rules `can_create_title` and `can_destroy_title`
  • Made `has_court_position` trigger able to take a scope
  • Made `court_position_holder` script lists able to take a scope for the court position type
  • Added ability to perform single character override in history
  • Added `effect_even_if_dead` for character history
  • Massively reduced bloating of error log caused by having save games from incompatible playsets
  • Made adding new doctrines not require changing the doctrine group file for its group
  • Made adding new laws not require changing the law group file for its group (there are now separate files for laws and law groups)
  • Made `rivers.png` hot reloadable.
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Patch 2026-09-15 September 15, 2026

  • Increase the competitiveness rating to gain the upper hand over other merchants
  • Gain more Trade Expertise for the primary trade good of the route
  • Increase the capacity of the route, allowing for more goods to be traded
  • Binding Oaths: Being exposed as a Dealbreaker causes more opinion damage
  • Increased Merchant Opinion
  • Fortune Seekers: Allows the Become Merchant Decision
  • Characters of the culture are more likely to become Merchants
  • Trade Goods Buy Price increases
  • Creditor Trait Experience gain increases
  • Saharan Traders: Allows the Become Merchant Decision
  • Route Length has a flat increase
  • Salt Expertise bonus
  • Precious Stones Expertise bonus
  • Precious Metals Expertise bonus
  • Lend at Open Interest : The recipient gets gold and owes 25% more back. If their Faith condemns Usury, they may later have the debt struck down rather than repaid. More on that in a moment.
  • Disguise the Interest : The extra gold is folded into fees and gifts; they owe 15% more, and there is nothing for a priest to point at. Slightly less lucrative. Considerably harder to denounce.
  • Lend Without Interest : The recipient owes exactly what they received, they think rather better of you, and if your Faith treats charity as a virtue, you even come out of it Pious.
  • Challenge Competitor : Contest their position of your competitor in a market you both deal in.
  • Sabotage Competitor : Dent the Competitiveness of a competitor directly and brutally.
  • Disrupt Charter : Make your Patron take back the charter given to a competitor.
  • Organize the Venture to hurry a scheme you already have running.
  • Put on Notice lets you stop waiting for the right Opportunity to appear, and start one against a specific rival in a market you share.
  • Undercut the Competition is the other direction: you cut your own selling prices, accept thinner margins, and force them onto uncertain ground.
  • Merge Company is the peaceful merger, presented as a Character Interaction. The target surrenders their network, their family joins yours as Associates, and you become the Dominant Trader in their former markets.
  • Attempt Hostile Takeover is a hidden scheme. You will need a Company at least as large as theirs, and a Hook somewhere in the arrangement — on them, on their Patron, or on someone inside their walls. With that, you’ll be ready to start taking your opponent apart.
  • Commerce - The family focus (and that of the Republic) should be all on trade, bringing prosperity and well-being
  • Aggrandizement - Family glory and self-fulfillment, holding key positions within the Republic is important to this House
  • Communal - Governing a Republic is not a privilege, it’s a responsibility these Houses take very seriously
  • Signorial - A Republic should be ruled by the elite few, and will do anything to move the Republic towards despotic rule (under their benevolent leadership, of course)
  • Agitation - These are the disgruntled Houses, whether it’s because of them disliking the current ruler or greatly dislike enacted laws, they’ll use any means necessary to bring about change
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Patch 2026-09-08 September 8, 2026

  • Simulation speed: we are aiming to match 1.19.0 “Scribe”, our previous quality of life update, on day to day performance. We are close to that today and expect to land near it.
  • The game loads a lot less up front. On our slow test machine for instance, streaming meshes and illustrations instead of loading everything at startup cuts time to the main menu by a significant amount, on my computer from 84 seconds to 16.
  • Video memory use in the same scene is down substantially - somewhere between a third and a half less, depending on your texture quality setting.
  • System memory a decade into a game is down by roughly a sixth.
  • AI decision making, a bit over a quarter of the day
  • The parallel pre-update, where systems calculate what they are about to change is about a quarter
  • The sequential update, where those changes are applied is roughly a fifth of the time
  • And firing events is a bit over a tenth of the time.
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Patch 2026-06-23 June 23, 2026

  • Clerical vs. Secular : are you an ecclesiastical or lay ruler?
  • Main Power vs. Secondary Powers : do you follow the Christian faith that currently holds the most counties in the world?
  • Ecumenical vs. Heretic : does your faith carry the ecumenical Christian doctrine, or are you a heretic?
  • Instability. Rulers are easier to sway to rites, excommunications fly, and gold has a way of leaving the treasury.
  • Crisis. The Church at its most scorched. Indulgences are cheaper, Ecumenical Councils more frequent, taxes suffer and (depending on the phase) even clergy may be able to marry.
  • Zeal. Mass conversion, cheaper bulls (more on that later), holy wars, and easier faith conversion.
  • Stability. Grand Cathedrals rise faster, characters take vows more readily, and emperors may even try to mend the Great Schism.
  • Clerical scandal: simony, embezzlement, clergy marrying or having children, head of faith murdered or marrying.
  • Secular interference: imprisoning a head of faith, ecclesiastical grant claims, replacing realm priests, lay investiture disputes.
  • Religious changes in the land: county conversions to or from Christianity, new or divergent rites, heresy outbreaks, clerical regions created or split.
  • War and holy sites: Jerusalem lost or reclaimed, great holy wars won or declared against Christians, humiliation wars, excommunication wars.
  • Shows of devotion: pilgrimages completed, cathedrals built, ecumenical councils hosted, mass rite conversion great projects.
  • Deliberate steering: the Guide the Christian Church decision is available to pious, learned, or powerful rulers every ten years at major piety cost. Choose which future Chapter you wish to push toward, and fire a massive Catalyst (+75 points) in that direction.
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Patch 2026-06-09 June 9, 2026

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