How should I develop my units to defeat a Knight?

Just tried to defeat a Knight with two Castles. I was looking for a weakness in your seemingly perfect strategy of Knights + Antimagic. And I found it. The trick is that it doesn't protect against Vampire's paralysis. Also, you won't be able to resurrect or cast any good spells. Vampirism is much better in this regard (which I haven't tried yet). To be honest, I even started to get a little scared, the losses were quite significant.

Added 1 hour 27 minutes ago
No, man, mish-gun, let's call off this bet. There's a high chance I'll lose, especially on the Outlands. On the surface, that cursed ring is lying around, which is a big problem for Necropolis. In the Dungeon, it's almost impossible to get through with that penalty, and the map is also bad. And there are too many Knights. You're basically right, Haven has more chances in the late game.