Мститель
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Veteran difficulty and Hero difficulty are completely different things in the campaign: I experienced it myself.
Besides, I heavily leveled up Godric for the future and even took the "guardian angel" skill, so I had to fight the mages first, then start over with the strongest unit (I don't remember, it seems like a Rakshasa), then people appeared, and finally, I fought the Angels as the strongest unit.
If you play without the "spiritual connection" skill, you might simply run out of mana.