Perhaps this task seems difficult at first glance, but the solution is quite simple. You slow them down (to a speed of 3 with the Earth skill at expert level), blind them, and then attack with archers (100 evil eyes), and sometimes you can even run around for some variety:D. When the ammunition runs out, which is inevitable, use golems and harpies. (You'll need about 300 mana). As a result, you can win without any losses. But the task becomes impossible when you need to destroy dead knights instead of imps. I couldn't come up with any simple trick. Whoever manages to do it, my fiery respect to you;) Even killing unicorns is easier.
Well, the solution is not that simple... and not exactly what you described... It's not that easy; did you personally win right away? And did you even play?
You have 275 mana, but even with that amount, it runs out easily ;)
And what golems are you talking about? Did you get anything mixed up?
I also defeated the dead knights, although they weren't upgraded, strangely enough, and I didn't use blind - I managed it :)
