Which faction poses the greatest challenge for the Dwarves?

Well, instead of magic, I think "Attack" and "Logistics" would also look good.

I'm considering a game with an equal number of Castles. And Ingvar's rush doesn't seem that scary to me. The main thing is to get the Summoning skill with Fire Warriors as quickly as possible; in the worst case, he's unlikely to capture a Castle. You can also quickly get several high-level creatures through promotion during a rush, while the Dwarf will only have Warriors and Pikemen. In the late game, the Dwarf will either have Armageddon with Pyromancy or Eternal Light. Plus Runes. Invisibility and Battle Fury. The Undead won't have that much "meat" (if the number of Castles is equal).