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I created a NONE class based on the Barbarian, but it only learns spells, unlike its predecessor. It doesn't have the Charisma and Education stats, and its characteristics only increase Attack and Defense. The hero for whom I made this is a Rakshasa, and his army of mages is weak and gets stronger with mini-artifacts, and their power seems to depend on knowledge.
Added after 13 hours and 24 minutes
You can choose NONE heroes at the beginning of the game, but if you set them in the editor, they disappear in the game.