How to kill Black Dragons?

The Chimeras fly to us and try to eliminate the heroes.

Maybe I'm saying something very obvious, but they usually succeed. ;)
Therefore, without any complicated strategies, we use the same manipulations, but with Devils. The arrangement is sparse, with the first stack consisting of Devils. They move first, jump behind the Chimeras (if they jump in front, the AI will fly around them from behind and eventually reach the heroes, which we must not allow), and the heroes huddle in a corner so that the Chimeras don't reach them on the first turn (it should be noted that the mage casting Vampiric Touch should initially be out of reach). That's all there is to it.