U.n.k.n.o.w.n.
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Nargott, the Skill for mages not only grants all spells but also allows using them at an expert level in the Tome of the Archmage, which the latter doesn't have. And it's not necessary that all players focusing on mages will invest in this ability, and we shouldn't forget about other factions either. Yes, I'm also not very happy that some things will be combined into one; I think there will be sets like in the original, which will be located in several slots of the hero and provide additional bonuses.