Er@ser
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I already wrote it. We build a converter at 1-1-1. We transform the right hero's mana and our zombie's mana. So, from Galtran, we get 2-3 stacks + one stack from our own, and the transformed mana from the right hero, resulting in about 100+-20. We take chests for experience. (only advancing necromancy) + with a 1-1-2 amplifier. And that way, you can gain 20-50 per day. By the end of the week, you'll have around 400. If you're lucky and there's a 1-2 supply depot nearby, you take it, and the problem of having a small movement range is solved.
And where do you get the money for the converter, the left hero, and buying skeletons in the castle if you're playing on 200% difficulty and the chests are used for leveling up?