Agreed with @TsunAmik. You have to redistribute the party so that the magic dmg dealers focus on warriors and warriors focus on mages. Sure I'd like armour that is percentage based but this is not bad too. This is a baldur's gate type of armour. There you had AR which influenced the probability to get hit, here you have how much to get hit until you pierce the armour.
Adding percentages to the armour/magic rating would be a bad idea.
Want to knock down a warrior? Destroy his armour first which is heavy and thick -> therefore hard to knock down. Want to knock down a mage wearing robes? Do it in one hit.
Want to shock a mage wearing protective barriers? Sorry, best I can do is damage for 3.
Want to shock a warrior? Sure, why not.
My character is warrior + Lohse Aero/Hydro + Elf scoundrel/necro + Ifan huntsman/pyro.
My warrior focuses mages, Lohse focuses warriors, elf focuses mages and ifan can do both, plus I can make his arrows do magic damage by electrifying the water, so he can focus both warriors and mages even futher.
