The only real problem with the Black Dragon is its vulnerability to magic (if positive spells could be cast on it, it would be the strongest), but it is also the most resilient and powerful unit in the game (in terms of hit points and damage, only the Crystal Dragon is superior). And if its growth rate were 2 per week, there would be no stronger creature in the castle, and the only unit that can fight the Black Dragon on equal terms is the Phoenix (50% fire resistance).
Oh, what are we arguing about! I'm just saying, let the devil jump! As long as they don't create a balance issue with its teleportation. By the way, in the Necropolis thread, you said that the undead turned out to be very gloomy. But I think the demons are the gloomiest :(. Just look at the Tormentors!
Цикл "Закадычные враги": "Особенное гостеприимство, "Супероружие", "Меж молотом и наковальней"
"Падение Шантири"
Кампания для "Кодекса Войны"
"Выбор Сагиттеля"