I was going for 帝国 when referring to the state in a political manner.
We have campouts and single day battles.
The day battles are being referred to as tatakai (battle, to my understanding). While garb is required, they're not very immersive. The battles are simply, fight-reset format.
The campouts are being referred to as renzoku (series/persistent, to my understanding - I'm using the word in the context that it's an ongoing story). This is where Clans can assassinate leaders, raid each other, seize each other's
koku, only
samurai may openly carry weapons, 20-30 minute respawn timer... so the kills REALLY count, etc.
But these renzoku campouts are all named differently. Some might be considered a war between clans, some might be considered a long battle, some will even be themed as festivals and feature tournaments.
Which is why I'm avoiding calling the overall organization X War. Though I have considered calling it "Game of Shadows" - but that would complicate things as I still have to name the country at that point.
Is there a large landmass that would work well with 陰?
Is Injima a proper way to say Islands of Shadow?
Or another way to say archepelago? Inrettō sounds like a mixed drink in a Spanish country...
Is there another way to say night? Yohon (I'm assuming its correct) sounds like the name of a German fashionista.