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What a mess, and what's the imbalance? First, you need to build a scout class and gather a large army! Sure, Brog is a great late-game hero. But regarding demons and other units, Inferno is one of the weakest factions in the game, so they decided to balance it somehow.
Absolute balance will never exist; you can only strive to achieve it!
I think that, among all the restrictions and additions, only the Tower suffered.