This was in a mod for Warband: https://www.moddb.com/mods/custom-troop-trees
When you created your own kingdom, you could create your own troop tree: slots to fill creating the equipment for every troop tier, its abilities and depending on the equipment, its cost, in which units will be able to evolve to, etc.
This troop tree was part of your culture, which once conquered a settlement (town, village) and after a while (being able to invest in culture conversion). You were able to recruit your own troops in your faction's settlements.
When you created your own kingdom, you could create your own troop tree: slots to fill creating the equipment for every troop tier, its abilities and depending on the equipment, its cost, in which units will be able to evolve to, etc.
This troop tree was part of your culture, which once conquered a settlement (town, village) and after a while (being able to invest in culture conversion). You were able to recruit your own troops in your faction's settlements.
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