Basically, a Mod that allows you to play a Spanish Conquistador during their Conquest of the Aztec Empire would be a LOT of fun.
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Conquistadors would be much tankier, Have better equipment, but be few in number
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Aztecs would be more agile, Have less quality equipment, be squishy, but rely on greater numbers.
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Possibly add muskets if possible.
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Possibility of playing either Spanish or Aztec