It would be interesting to know where you recruit them!
Posts from How to kill Black Dragons?
Auto-translated
I know for sure that 15 black dragonlings can be defeated by a level 16 Barbarian or Rogue... if you choose Haven and a Mage, he should be at least level 25, equipped with good gear, including a shield made of dragon scales, Haven armor, a helmet of fear, and a ring of great reflection...
P.S. (I might be wrong about something... feel free to correct me...)
-----------------------------
Warlock_SP - Oh, I'm ashamed... how can you cheat... if you want to be a true connoisseur of Heroes, forget about the codes you might have used, even in jest... this is just a suggestion... :(
Основные правила портала www.HeroesWorld.ru
ФЛУДОВСКИЕ ССЫЛКИ!- сообщить о бесполезной теме/сообщении.
it's better to move back, and they won't reach you, and then attack )
and it's better if there's a strategy ))
Against the Champions of the Dungeon, it's good to position yourself in a corner and, preferably, use Titans, provide them with protection, and when the Champions of the Dungeon attack, they won't attack everyone, but the Titans with Double Damage will be able to win!

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!
I think he meant an amulet. Which increases damage against Chaos creatures.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!
Well, if you play on the highest difficulty, yes, but what's the point? The AI is still pretty dumb. I don't know about others, but I don't like starting with zero gold just to prove how awesome I am; it seems pointless to me.
I'll try to write down how you can defeat them using Death Knights, just a theory; I don't have time to test it right now. Let's say you have a Necromancer, a Death Knight, 5 Dracolichs, some Vampires, Cerberuses, Skeletons, and Imps in your army. So, the Death Knight only drinks Health Potions, and that's it. The Necromancer casts Vampire Touch on a Dracolich (should already be level 4 in Death magic). Everyone else uses the "Wait" command. The Death Knights fly towards us and try to take out the heroes. We don't care about the Necromancer because he's already done his job. The Death Knight tries to survive by drinking potions and tries to take out the Death Knights by taking damage (e.g., hitting one soldier first so that there's no retaliation). Then, we just attack them, and that's it. I'll definitely test this later.
By the way, I'm not sure, but it seems like "Hand of Death" works on heroes with 100% magic resistance; maybe it will work on Dracolichs too? You can also use the Necromancer's "Sacrifice" spell, but that's level 5, and he probably won't survive that long.
The Chimeras fly to us and try to eliminate the heroes.
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.
Не стремясь приобщиться к основам пришёл.
В прошлый раз утащил я молитвенный коврик,
Он истерся до дыр, - я за новым пришёл.
© О. Хайям
Maybe I'm saying something very new, but they usually manage it. ;)
And therefore, without any unnecessary complications, it's the same manipulations, but with devils. The arrangement is sparse, the first stack consists of devils. They go first, jump behind the Champions (if they jump in the face, the AI will flank them from behind and thus reach the heroes, which is not allowed), the heroes huddle in a corner so that the Champions don't reach them on the first turn (it should be noted that the mage casting Vampiric Touch should initially stand out of reach). That's all there is to it.
I'll test this strategy at home, but 5 Imps don't seem to be able to kill even one unit...
It also depends on how well your tactics are developed. If your tactics are poor, no amount of vampire touch will save you.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!