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I think I understood that it's better to... at the beginning of the game, right?
And is this about the 5th part?
In parts 3 and 5, knowledge is very useful at the beginning – it's essential, and you can cast both damage and buffs...
Knowledge is good in Heroes 5, but it depends on the playstyle. It's essential for a Warlock, and also useful for a Knight, but mostly it's not that important.
