Are you talking about a civic, a societal mindset and tradition that permeates and forges all the society since before its coming to the space age, or are you talking about another option in foreign diplomacy and federation making?
@Bezborg is right: Feudalism is not "vassalism".
You can be a feudal society without having any conquered or diplo-vassalized dependance.
You can vassalize another empire without being yourself an empire organized as a collection of vassals under the emperor's formal rule (i.e. feudal states).
There may be other civics that have implications outside the empire (like having an envoy more?), but this one is too much centered on a narrow game style: it's not about knowing what to do with freshly conquered empires (vassal? integration? ...), it's like never expand but through/if not making vassals.
So, either:
@Bezborg is right: Feudalism is not "vassalism".
You can be a feudal society without having any conquered or diplo-vassalized dependance.
You can vassalize another empire without being yourself an empire organized as a collection of vassals under the emperor's formal rule (i.e. feudal states).
There may be other civics that have implications outside the empire (like having an envoy more?), but this one is too much centered on a narrow game style: it's not about knowing what to do with freshly conquered empires (vassal? integration? ...), it's like never expand but through/if not making vassals.
So, either:
- Make it a real civic that characterizes and impacts a society made of tenants, vassals, overlords, ...
- Make it a real authority-centered "civic" that forces (or helps) the empire (the player) to play tall, with the quasi-automatic assistance in war, economy, research, diplomacy... of a lot of vassalized empires, the size of a sector (a vassal might be more powerful and extended than its overlord, but let's keep it simple).
- Make it both, and water down each aspect, for balance. In my idea, a society impregnated through (1) would act as (2) with other conquered empires.
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