Waterfall_13
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Is it even necessary? Even if you manage to get 60 units of knowledge, they won't be very useful, as you're unlikely to spend 600 mana, and the combat units won't be as powerful. You can only develop this way in battles that last for several years, and even then, it comes at the expense of other stats.
In the game's mechanics, the maximum benefit for minions with 60 knowledge is revealed.
And what do combat units have to do with it?