[Fantomen]

What should really be changed is the Bogarus national Zmey, by taking away the cold blood from it. A cold blooded national summon for a cold preference nation is ridiculous and will never ever be used. Why make the EDM Zmey less viable when you can make the national Zmey summon viable instead?

Zmeys are basically three headed dragons, and no other dragons are cold blooded in Dominions. A creature that can breathe fire should be able to keep itself warm I gather, especially one with it's roots in siberian folklore.

Zmeys are balanced and not overpowered now. Cold blood is a huge nerf, so you'll just end up with a big need for more balancing for the benefit of a minor thematic quirk.