Which monster do you like the most in Heroes 5 at level 7?

Yes, the Thunderlords deserve credit; they are strong. But, in my opinion, it's better to shoot than to create a cloud. Think about it – you're simply taking away a shot from another archer, but you're also taking away a shot from the Thunderlords, who might have already taken down enemy archers.
The Rainbow Dragon was renamed to Crystal. It's a bit strange how they translated it; it seems like it was originally written as Rainbow Dragon, which means Rainbow. But in the game, the translators translated many things strangely.
What do you all think about the Red and Magmatic Dragons?

Well, if you increase the initiative and morale of the Thunderlords, then you can immediately take down the archers. But if there are many archers, for example, those Elven archers, and there are VERY many of them, then it's better to reduce their damage. The Rainbow Dragon was renamed to Crystal in English as well; it's now called the Crystal Dragon, but I think Rainbow would have been a better name. As for the Red Dragon, I don't even know; it seems a bit weak to me. 1.5 damage is good without a counterattack, but the Black Dragon can do the same with its regular dragon breath, which hits 2 squares away. Of course, the Red Dragon is better against Barbarians, and the Black Dragon is better against Mages. And the Arcata Dragon (I don't understand why they're already calling the third creature Arcata: Arcata Warrior, Arcata Priest, Arcata Dragon; they should have called it Magmatic) is still better than the standard one; I think the Lava Shield is better than the Fire Wall, although if there are many dragons, then the wall will also work