Dark Knight

[LDiCesare]

Then dark knight flies to our troops before Bogus can help him, then he gets surrounded and killed.

You do realise he's got a defense around 29 plus armor, so he'll usually kill a few guys before he goes down.

So, after the flying knight Bogus becomes surrounded and killed.

Usually, what happens is he becomes berserk, and kills everybody around him.
Maybe 80 emerald guards, or abysian infantries with heat aura, can kill them, but it's unlikely in my opinion.