Thundax
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No need for such ideas; no one would play a mod like that. It's not right to try to improve the second game with elements from later installments. The third game was born from the second, taking all the best parts from it.
The balance in the second game is excellent compared to the third. And I didn't really mind the lack of third-level and higher combat spells, when a strong unit like a 10-10 hero could easily defeat red dragons built in a conquered Dungeon castle. DimDoom is great, of course, but you still have to acquire it.