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There is also this tactic (when playing as Necropolis). Quickly build up to Vampires and upgrade them. Then, calmly build up to the Capitol. If there are a large number of low-level neutral creatures on the map, there will be many skeletons, and they will help you earn money and resources. In this case:
1 - the hero levels up.
2 - you calmly build the Capitol first, and then the troops.
1 - the hero levels up.
2 - you calmly build the Capitol first, and then the troops.