AlekseyS
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I looked at the thread about banning creature upgrades, but it didn't help. I don't know how to prevent the first upgrades of all creatures in a town.
(See the screenshot below)
Click on the town, and you'll see two parameters at the very bottom:
NotUpgradeable - prevents the selected creatures from being upgraded to either a regular or alternate grade.
ForbiddenUpgradeable - prevents the selected creatures from being upgraded.
In your case, you need to use NotUpgradeable.
