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Will the conversion be free? I remember that in Маркел's version, they required 10,000.
Added 3 minutes later
And in the sixth game, it's not free either.
Added 18 hours and 10 minutes later
If I understand your idea correctly, Dyrman, then the ratio between the city level and the hero level will be as follows: city level / 100% = hero level / x%, where x is the probability of converting the city into %. If this is the case, I would like to suggest that the hero still loses something, perhaps not gold and/or resources (as in the not-so-pleasant sixth game), but, for example, movement points. That is, like losing Ashan's tears; to convert, a full movement reserve is needed, and all movement points are deducted regardless of the outcome of the event. This, as it seems to me, will introduce an element of risk for the converter (if he is a "roach" and the main character is not nearby) and give the owner of the castle a chance to reach it.
P.S. If I still misunderstood you, and you would like to explain it to me, please speak in simpler terms (not the way you communicate with RedHeavenHero). After all, I am a user, not a programmer