Which faction poses the greatest challenge for the Dwarves?

to Mish-gun: You think I don't know that any Necromancer considers any castle their home? And if they get lucky with artifacts and castles, even two, I assure you, I'll defeat your Dwarves with ease. Just yesterday, I lost to Hafiz on a map, and he had only ONE castle, and Hafiz had a bunch of those Gremlins (he tried to rush and got his butt kicked). Besides, judging by everything, you think you can level up to 30, where will you get that much experience? There's no need to act smart and say that you already know everything; I think you just haven't encountered serious Necromancers - and there are some on the map, and they might even be stronger than me. Dwarves are useless against Mages, and even more so against Necromancers.