Cheers, Endarire! Did you make two lone wolf casters or a four-man party? (I'd take Vaxsan's advice to heart and would not create an all mage team. Elemental damage will be weak in the late game.)
Small tip on Wildfire
Wildfire is actually best used with Rain on the first map as it makes warm which is one step away from burning.
Another tip on Silverglen
At level 3-4 you're definitely good to go off into the wild west. I wouldn't leave for Silverglen though. Not before I finished the first map.