Honestly, if you added Barbarians there, then the game would be fine.
Posts from Which race would you add to Heroes?
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Do you mean all factions from Might and Magic, and you decide to add "anti-mages," i.e., purely strength-based units?
Barbarians! Make them like in Heroes of Might and Magic III, and everything will be fine!
Still, let there be at least a little magic!
Absolutely! Bloodlust and rage are their most powerful spells!
Don't be ridiculous! Three levels of magic!