I can't figure this out. I capture some territories with forts, but I can't upgrade to a keep right off the bat like you could in MTW. Is there some other prequisite? I can't find it in any of the building descriptions. I eventually get to where I can upgrade to a keep, but I haven't found the pattern of what is required yet.
This mod is great, one of the best I've seen of any game really, but it really needs a tech tree/unit FAQ. Can anyone enlighten me? Thanks.
Grifman
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