The model of the old mage from the Silver Cities is not currently used anywhere, so it would be a good fit.
upgrade - creatures that the calculator suggests upgrading to the next level, but we take the increase as if they were not upgraded.
We calculate the price of upgraded units as follows: we take the price that needs to be paid for the weekly increase in creatures from the Castle and adjust it so that it fits within 28000.
Added 1 minute ago
By the way, I came across another bug. When selecting duel mode, instead of the portraits of the heroes (Dark Elves), the portraits of the demon heroes are shown.