I just realized something about this: This makes Warriors even worse than now, because the only thing that can deal with the new weak spot is an Archer in the right spot, or a Cavalry. Which means all-Cavalry is pretty much just as good as now, but Warriors are complete crap tier. I would highly advice against this. I like the idea of having Strife not come from combats, though I'm not sure about having it come from upgrades. Upgrades are good, and if you make them worse, people might pick spots in mountains for their cities, to slow down the pace of upgrades. As long as you can somehow keep your army running (e.g. resurrection and stalling), the lack of materials isn't a deal-breaker. It could be a third "resource", that is collected from depleted fields (1 per turn per depleted), and whenever you accumulate 20 in a single city, you gain a strife. Currently the overworld feels a bit shallow, because literally everything of relevance (destroying hives, defending cities, gaining cards) happens in combat. Also Feast is crap, why would I ever want more Strife instead of 60 resources? If it offered a card instead, it might be useful.