Here is my suggestion.
I propose to strengthen the Capitol (or create a building after it, if the first option is not feasible). The bonus will be given when defending the city:
Humans and Elves: +2 to luck and defense of the defending army
Magic and Tower: Strengthens the "Spell Power" of the defending hero.
Necromancer: -2 to luck and defense of the attacking army.
I haven't come up with anything for the others yet.
Added after 38 seconds
Idea:
Once a week, it generates a pile of resources near any nearby mine that belongs to the player.
Idea 2:
Resets the opponent's movement points before entering the city, giving an extra turn to prepare.
Added after 2 minutes
Well, what will we add? ) I don't think it matters if there is a little freedom of thought. You can even change the formula fundamentally: for example, add +5% of the gold that is already available at the beginning of the week. In essence, the difference is small, whether it's this way or that, you still need to accumulate more gold by the end of the week so that you have more at the beginning of the next week.
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