IMO a solo Cleric/Mage is a pretty good class (or maybe it's too easy). The choice of weapons is a bit limited, but that didnt stop me clearing out Nalia's castle including golems in less than a day - slept just before it and finished with about 5 spare cleric spells.
Didnt even need to drink any healing potions
(Started it on lvl 14/13, finished on 15/14)