And who is weaker among the starting castles? Tower? Inferno? I don't think they are that weak. And the mirror is a completely specific issue that cannot be resolved by changing the skills of any one hero. Rather, scouting experts should be banned in principle, as well as logistics experts and experts in 4th-level magic.
p.s. If you don't understand something right away, it doesn't mean it's nonsense.
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