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Personally, I'm all for creating this map, but one major drawback immediately stands out: the defining characteristic of Dota is its dynamism, the fact that you can be killed at any second (even if you're at your base or even at the fountain), whereas in your map, danger only exists during battles in the wagons! The adrenaline of the game is lost! I would suggest something like this: creatures move on their own, and their growth and variety depend on the number of the week (for example, week 1 - peasants and archers fight, week 3 - archers and squires fight, and so on, up to angels and paladins). One week equals 7 minutes of gameplay. Something along those lines, otherwise the map will be boring and lack the adrenaline that exists in Dota!