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Best Mount & Blade II: Bannerlord Mods
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
Off the top of my head, the arena mod makes 'training' your troops a thing, by bashing them about in the arena. I liked it because I could pretend I was actually training my army.
I know there were several others I used, including an execution mod that makes it so enemies of a lord you execute are happy with your decision (rather than every single lord ever suddenly hating you), a politics mod that makes other nobles more 'realistic' in their moods and desires, and one that changed the max level you could get in a skill based off of points invested in it.
There might have been one that added a 'missile barrel' that you can get more arrows from in a siege, but I think I'm confusing bannerlord with warband on that one.
Arrow barrels are already in vanilla Bannerlord so that was probably a Warband mod.