As a Servile, you probably want to sink some points into blessing magic so you can get essence amour. I would get Parry to at least 8 because it's only like a 6 skill point investment. You want to pick either fire or magic shaping to get some ranged support.
And crystals are definitely worth it in many instances because they only use 3AP. In conclusion, you should:
-Get mental magic up to daze people
-Get blessing magic up to buff yourself
-Invest a point or two in magic or fire shaping and let the items take care of the rest
-Invest a bit in dexterity and missile weapons (14 skill points would get you 2 levels of dexterity and 4 of missile weapons)
-Put a little in parry and a lot in quick action
-Get strength up high so you can wear heavy armor (although its not that big of a deal if you have the talisman of might)
-In the end you want to get melee weapons up to like 10 and maybe get a bonus from Legs of the Tyrant