Yeah, pretty much. I'm looking for a subset of rules that will let me update and play some of the classic BECM modules with mass combat in them (CM1, "Test of the Warlords" and X10, "Red Arrow Black Shield" for example.) Not an entirely different game; just something that would work seamlessly (or at least be compatible) with the 5E rules.
That style of game is considered outdated, though, and probably not coming back anytime soon. Nowadays, gold is to be spent on magic items, not castles, and the path to power isn't through the conquest of nations or the strength of armies, but through 9th level spells and ancient McGuffins.
sigh And that's fun too, just...not what I'm looking for.
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