Shogun
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For Vaishan.
Lightning exists, but there's no way to use it.
Just try it, and if you encounter any problems, let me know, and we'll discuss it.
Regarding Heroes of Might and Magic III:
The issue isn't so much the AI, but rather that on the Hero difficulty level, you start with nothing. That is, 0 money and 0 resources, and strategies like the one described above are not feasible.