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It seems like Tamika starts with a disadvantage, as there are Necropolises on the map, but she has no way to capture them. Her starting army is weak, and the guards are unpleasant archers and fast units, so instead of accumulating skeletons, they only decrease in number. To progress further, she needs Vamps, but she doesn't have enough money. She ventured into a Necropolis, but it's maxed out, and she's stuck there.
Thanks for your time.