Welcome to the forum!
I'm still a bit new myself, but I'll just throw in my 2 €-cents:
If it's against undead Ermor, the obvious answer is "priests".
And even if you play Ulm (I like to play Iron Faith myself), DON'T neglect magic. Strong commanders still need good items, and you wouldn't believe what Ulmish smiths can do with their blade winds on a good day.