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So, after the introduction of dark energy, necromancy became very weak in the late game, so both races' units are bought for shiny coins. Additional castles for the Necropolis are not a problem on a large map. The army itself is stronger than the Necropolis army, especially the cavalry under Axel. So, humans have an advantage in a prolonged game. Of course, randomness and skill still play a role. But yes, the size of the map is a major factor.