That is not possible given the engine that we are working with. You would need to design a new engine from the ground up. However, I don't think, given the size of the armies that total war games deal, it would be plausible for a game to keep track of individual stats for each soldier. Furthermore, I do not think that any army ever promoted someone based on the number of people they had killed. That is not a good indicator of leadership. As for some kind of hero mechanic, that sounds like something out of warhammer of starcraft, and certainly isn't at home in the world of EB.

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