After a restart, I ended up with Crag as my last hero. I found two bear dwellings and started playing. Besides that, there wasn't anything interesting on the map. I reached level 121 by traveling off-road through a group of liches (there were fairies along the way). At level 123, I broke through a blockade of 15 black dragons, losing all my creatures except for a Pandor with all its magic (wisdom was at its base level, of course) and 10,000 gold. With their help, I finally upgraded the bears. For the rest of the week, I cleared a rather useless center with the wings I found, but they only gave +12 to defense. At level 132, Tazar appeared and took over the central dungeon with 5 black dragons and 30 minotaurs, all with roughly equal stats. On my turn, I attacked with a magic bolt and a significant advantage in creatures, and the game ended.
Thank you for the game.