SergeyY
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All of this isn't overpowered. Although, I would at least move the boots to the major artifacts category, or even to relics. But 9 angels on the second week is definitely overpowered =).
Regarding the 9 angels on the 2nd week – absolutely correct! Some people get 9 angels on the 2nd week, while others get nothing. Their 7th-level troops on the 4th week will be weaker than these 9 angels. Furthermore, starting from the 2nd week, a cumulative effect begins – they get Dracutopias earlier thanks to the angels and wyverns, leading to an even greater disadvantage.
Native creature dwellings (or whatever you call them, "niche" buildings?) – are a much less significant advantage.
But people are used to their favorite griffon conservatories and hives. The solution is simple – reduce the contents to a minimum – so that they always give as much as the minimum (1 angel), and increase the defense to the maximum, say, so that the defense is always as high as the maximum.
And everyone will be happy.