[Beta Version] Patch Notes - 1.3.10

Checksum: c764

Date: July 07, 2026

Previous Patch: 1.3.8

Society

• Using the cabinet action to assimilate Primary Culture pops with a non-primary culture is now correctly much slower, instead of being the same fast speed as Discriminated cultures.

Diplomacy

• Enforced an alliance-style opinion floor and at-war block on defensive league joins.

Military

• Reduced levy food consumption so early-game levy armies can sustain themselves without supply trains.

• Capped the over-supply-limit food consumption penalty so large stacks no longer drain full reserves in days.

Geopolitics

• Locations with pops migrating in no longer cause diseases to continue indefinitely.

Advances

• Moved levy, ship, military, and production advances out of the free age 3–6 trees.

• Institutions now spread from the birth location to the market center at a base of +1% each month.

• Increased the friendly-neighbor institution spread rate (0.020/0.010/0.005 → 0.040/0.030/0.020).

• Stopped blocking achievements when Could-Have-Spawned Spread Gamerule is enabled.

Other

• Made HRE Rank Restriction achievement-blocking.

Situations

• Hussite Wars: The Plight of the Hussites event (hussite_wars.7) option A now creates an alliance with Bohemia if possible.

International Organizations

• Fixed an issue where the AI would flood the Emperor with the Imperial Diet petition.

Events

• Made AI Scotland much less likely to convert to Gaelic culture during the opening events.

• Fixed the "Rise of Timur" situation (flavor_tim.8) not firing because the Chagatai Khanate and its vassals use Mongolian culture, which was not included in the Turkic/Iranian culture group check.

Government

• Fixed the Genoese "Diarchy Republic" unique government reform incorrectly applying a character-scoped modifier by replacing it with +10% Cabinet Efficiency, and the reform's description showing the wrong country name after forming a new country.

• Corrected the formable tier of TUR_f (Ottomans) and RUM_f (Rum) to be Tier IV, on the same level as Byzantium (BYZ_f), which was the original design intent for the three of them.

Economy and Production

• The Merchant Guild Chapel building is now correctly available only for Building-Based Merchant Republics.

Triggers

• Fixed an issue where the "is_parent_of" trigger would always return false.

• Allowed game rules to be changed mid-game in multiplayer.

Bugfixes

• Fixed a crash related to the map line manager.

• Fixed a crash related to antagonism.

• Fixed a crash related to pop conversion.

• Fixed a crash related to the filters in the mercenary captain selection screen.

As usual, here is a list of handy EU5 links:

Be Ambitious!