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EvgeniLipetsk, what version of the game are you playing? Have you completed all the quests? In what order did you capture the castles? Did you upgrade the dragons (which is not allowed)?
In versions 1.41 and 1.5, I captured:
1. The castle on the western island.
2. The northern castle on the eastern island. After capturing it, a druid appeared.
3. The southern castle on the eastern island. This unlocked the ability to curse cities. I cursed it immediately.
Then, I spent several months exploring until I learned all the dark magic and summoning spells, as I had greatly improved Godric. I collected over 100 dragons. Without strong magic on the hero, Marcellus in the fifth mission has no chance against my Godric (in my opinion). Even with strong magic, I defeated him with great difficulty.
In version 3.0, I want to try capturing them in reverse order to unlock the ability to curse cities more quickly. However, I don't have time to play right now. I completed the first mission but haven't started the second.