Then expand the uses of crafting. If Blacksmithing governs weapons and armor, let high-level crafting govern setting magical enhancements on gear, robes and staves. Yes, part of it is already in the game, but let your crafting level determine how strong the enchantments you lay with a Tormented Soul are. Say levels 1 and 2 give a +1 Str/Dex bonus, 3 and 4 give a +2 bonus, 5 gives a +3 bonus. Or maybe crafters can use tenebrium ore to enhance staves with void damage, or robes with tenebrium resistance. Or maybe they can craft skill books (non-mage).
