Just wave after wave of Knights Lonnuso.
(I stole this line from GerikGnome today.)
Seriously, though, I think a lot of the fun in that game would be hiding that you cast magic. Of course members of non-human races might get a break if they can convince people they are clergy of their church (it's bad diplomacy to burn elven clergy at the stake if you want elven goods next spring and Ludremon trades with Ingrast). GerikGnome never casts anything but shockbolt when others can see him, just because he knows human clerics can cast shock bolt (in RM of course). I've told him that Gnome clergy often practice arcane type spells, but he still plays it safe.
My legendary first customer sends me game updates as he plays. They had a very difficult battle in Felric's Redoubt because half the party were spell casters and none of them dared cast for fear of the Witch-Hunters. GerikGnome, on the other hand would have used his Spell Trickery skill and shockbolted them into remembering the name of God. (In fact, I think that's what he did in the playtest).