Allegiance Overhaul

Initial goal of this mod was to make the logic which NPC clans use for leaving or defecting their kingdoms more sensible and controllable, while not preventing such actions completely. Now that it's settled, there are some aspects of kingdom management and core game mechanics, that do have room for improvement, as I see it. There will be a description for every change down below. A bit later, though. :)

Source code is available at GitHub!

Explanation

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The mod has three main systems and several subsystems, which may be turned on or off independently. The biggest system named "Ensured loyalty" and it adds new game mechanic, that restricts AI clans from hyperactive migration between kingdoms. "Migration tweaks" system expand on this field and changes a number of things, related to topic, striving to make it more even between player- and AI-governed kingdoms, while providing some new options to the political actors. It is WIP on a fairly early development stage, along with "Politics rebalance" system.

Some of the systems could be applied either to player kingdom only, or to all realms of Calradia. I highly suggest using the same rules for everyone - that's what I had in mind while designing the mod.

Here is the detailed overview of implemented systems (I put info under spoilers for the sake of page brevity).

Ensured loyalty

Every AI clan of every kingdom periodically checks if it should leave its kingdom in search of better opportunities. There are two options they consider - just leaving and become independent for a time or defecting to another kingdom. These terms came from the game code and will be used a lot both on this page and in the mod itself, so, please, note them. Natively, leaving always means that clan will abandon any fiefs it has, while defecting means that clan may take their lands with them, if the kingdom they are defecting to (aka target kingdom) is at war with their current kingdom. Now this is how things work in vanilla. The problem with this logic, as I see it, is that evaluation process somewhat simplistic, which leads to a situation when clans leave their kingdoms seemingly out of the blue and maintaining a kingdom becomes frustrating for player.

Ensured loyalty system adds several adjustable conditions to skip above consideration logic partially or completely, depending on your tastes and desire for "fair and balanced" or just comfortable gameplay.

First of all, it adds oath of fealty limitation periods, so clans can't change factions the way one changes clothes. Same goes to mercenary contracts, but to a lesser extent. This skips considerations for clans completely, if they joined a kingdom not long ago. My intention with that