In medival times there where many kinds of units with most of them being in the game but, there's one major unit missing from the game, the Runner (soldier), they were the main unit to deliver and take orders from generals in wars and if were absent, the army would quickly fall into disarray. So I thought of a mechanic where if you dont have many of those in your army then you would start suffering some attack and moral debuffs, the unit size should be a small 100 manpower unit (that cant attack very well so it wont be abused) and for every five units you would need on one of those units
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