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You're making it seem too easy. As far as I know, Goblin Shamans don't 100% block enemy spells, but rather with a certain probability. The "Magic Resistance" skill only makes sense if the Barbarian has decent magic skills of his own, which is unlikely unless you equip him with specific artifacts, but doing so just for the sake of a skill doesn't seem very reasonable (in my opinion). And regarding the artifact shop, where's the guarantee that it will even have artifacts from the Dwarf set? The probability is very low.