How should I develop my units to defeat a Knight?

Regarding the map, it didn't really seem tailored for Necropolis; there are many good artifacts, but not everything I need. I did level up quite a bit, and the mentor was a nice addition, but having only one castle didn't quite satisfy me.
We could play around 8 PM Moscow time today if you're available. If we're playing as outcasts, I'll be at the top. We can also play against the AI; I'm fine with that. Just make sure to save the game properly instead of relying on autosaves to avoid any issues.