I'm curious about the heroes' stats, what magic they had, etc. It seems like 75 bears shouldn't have died under antimagic.
Well, the bears are killed by the same clone archers. The main thing is that the battle takes place in a castle to limit Mikhail's movement. Almost all the main magic is available on both sides. Besides the elixir and the alliance spell, there's also the golden bow, which gives +10% to attack and 10% magic resistance.