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At the level of events we are discussing, are you referring to a hero with 800 HP? I was talking about campaigns. He has that much health after two or three scenarios. And the army, unlike the level, is not carried over to the next scenario, thank goodness.
In general, by the 4th month, you can build an army that deals damage in the thousands.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!