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Well, I completed the mission three times, for example. I only succeeded by defeating the dragons near the cartographer.
Then it's simple: open the map, sail to the central island (by that time, with the help of the mage's eye, the part of the map where you can dock at the island is already revealed), defeat the druids and a dozen dragons.
When I reached the dragons across the entire map, I had 35 of them; I went to gather an army, returned, and there were 70.
Fight as much as you want... And both times it was like that, and then I cheated with the cartographer.
darksvettlana, where exactly did you get stuck? He doesn't sail to the black areas; dock there. He moves around the map normally. Be sure to visit all the Mage