Shionis
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I did it! And this was my 3rd attempt. I completed it with these heroes and without Phoenix. Basically, take 2 towns on your territory and then go through the portal to the town in the northeast: it has light defenses. And then it's just a matter of technique. I used Shaday to take a couple of points and then defended against invasions. After the first two castles, you might be left with a dozen minotaurs. Good luck to everyone!