The strongest castle in Heroes of Might and Magic IV.

A Barbarian (and other warriors) can always learn magic if needed...
it's just that they will have little mana...

and then you need to learn the spells, but to learn them, you need to find a Sanctuary with a spell, or capture a Castle and build a Guild there, but you need to capture the Castle first, especially if the hero is an Archmage, with magic of life, order, death, magic of life, you can cast hypnosis on a unit, then turn him into a martyr so that all the damage to the hero is inflicted on him, or take the Barbarian himself, hypnotize him so that he destroys his own troops, and you can also take