Here is an "unrealistic" Sorceress and her results at a beginner level. And Barbarian Sorceresses can also destroy towers:)
The Sorceress fought Zenda and had twice as many troops as in the first picture.
New here? I'm Roha — want a quick tour?
Rock and slippery ground are good at the start against neutral creatures. The neutrals will be defeated quickly.
Since Orcs don't have access to Primary Magic, you can take Dispel from the Dungeon faction and Purity from the Haven faction – these are general spells (or at least, that's what I think they're called).