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It seems to me that in 3.0, the Dwarves were slightly nerfed. To get a good spellbook, they need to level up non-core summoning magic. I don't have the wheel for 2.1 anymore, but I don't think it was like that. If in the Woodfsten campaign, he can learn summoning spells from Zehir, then in regular games, they might have problems with that. And leveling up 2 powerful schools of magic is an overkill (IMHO).