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Excellent map! I played through it with a hero, and it was captivating from start to finish. I didn't notice any unfair bugs like the ones described above, nor did I use them. I didn't encounter any problems at all; the losses were minimal (just a few units), and you need to progress steadily. The second, more powerful dragon can also be defeated without any losses, unless you consider the wolves I bought to absorb attacks, which I used as expendable units.
Overall, kudos and respect to the author! Thank you very much; it was great.