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Well, my opponent was putting pressure on me, he had a castle with a large population, and he was taking out all my weak units... I rushed my army into the treasure, because I didn't see any other options... And then I got such a great reward. Now I realize that I was too greedy, I wanted to fight with my army, use Arcomage at the end, and have a way out if things went wrong....) There were a lot of ducks, and that's why they survived the Arcomage attack at the end..
And I didn't really notice any morale penalty, so I guess I used the artifact on Morale for the black dragons... and that's how it turned out)).