What needs to be fixed in the Tribes of the East in patch 3.1?

The further the city, the more mana is needed :) Otherwise, it becomes a cheat. I also think it should have been fixed, but in a different way - by prohibiting teleporting to the city at the end of the turn, but only at the beginning. It's an outrage.

No, the distance to the city doesn't matter at all. Summoning one creature (whether it's a devil or an archdevil) consumes one mana - that's the whole "formula," meaning, for example, the Town Portal spell has the lowest mana cost due to the increase. And there's no need to change anything for the Knights. What kind of "game feature" is it if you can create almost an unlimited number of archers? No, everything is fine with them, in my opinion.