Let’s come up with a monster.

They simply don't add anything to the gameplay (as Saruman correctly pointed out - if a hero is strong, they will capture it, if not, they won't), they introduce unnecessary absurdity (in my opinion, I don't like having dozens of different types of dragons), and it's unfair - if you manage to capture such a dwelling early in the game (and wizards, attacking with a squad of golems and defeating the dragon with spells, can do that), it just becomes ridiculous. And diversity - and much more diversity! - will be brought into the game by accessible and approximately equal to ordinary monsters.

P.S. - and a dragon cannot be stronger than an archangel:mad: IMO

Added after 34 seconds
The post is a bit late:D