How to kill Black Dragons?

In principle, you are right, but who, I wonder, would attack them at such a level?! I've been playing for quite a while, and it's impossible to win with such a level without a decent army!!! Although, I'm waiting for your suggestions. You seem to be an experienced player, so write something. Even better if you write to
Scorpion-221@yandex.ru:smile03:

Well, I'm only experienced against the AI:D, although I'm gradually gaining experience against real players,
Regarding a decent army, Arandor already gave an example of a tactic against the Castle, check the earlier posts,
regarding 10 Castle with a level 10 hero, let's say a Crusader (tactics and life if I'm not mistaken, max morale) level 10, so at level 10, there will definitely be level 4 Life magic (maybe even level 5, but let's assume level 4), let's say this is the first month => there will be no more than 5 Angels (I like them because they resurrect, they are flying units and fast), about 20 Crusaders, and 40-50 Ballista, and a few archers. So, there will be 3-4 Dragon units (3-4-3 or 2-3-3-2), they will most likely skip their turn (the AI constantly does this for some reason), option number one (if the Angel will move after the Dragons) skip the Angel's turn (if the hero moves first, then the Angel's turn can be skipped), as well as the others, except for the hero and archers (it's better to move the Crusaders further away so that they don't get hit), the hero can cast either General Chaos Ward, or Prayer, or Guardian Angel on the Angels, then when the Angel's turn comes, fly to the Dragons and try to attack them so that they hit each other in response, if Guardian Angel is cast, there will be no losses for the Angels in response (also with Prayer and if the archers have done a good job, the Angel shouldn't be taken down), then the Dragons move (one unit can already be taken down), since they don't fly to the army, they will all attack the Angels (I think they will take down one or two, taking into account the tactics and spells), then the hero will most likely move first (morale is at max), cast either Chaos Ward, if it hasn't been used yet, or some other positive mass spell (for example, General Passion), and then work with the Angel and archers, if the Castle units reach the main army, cut them down with the Crusaders (but there will still be more losses)
P.S. Don't criticize the example too harshly, there is something to criticize, but still, here's another thing, you also need to position the troops well (don't put anyone in the first and second squares, otherwise the Dragons will immediately fly over and there will be big losses), in the example, the size of the army is not very small, but I at least offered something on the topic (think about it before criticizing), I hope I didn't miss anything; Optimal, here is an example for testing your topic "Theory and Practice" (or something like that)
In conclusion: my version of the minimum army, but for 10 Castle - 5 Angels, 20 Crusaders, 40 Ballista and 100 archers (maybe even more):) I boldly throw myself under a barrage of criticism:D