Magistar
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It's debatable. For example, with logistics, you could easily take the first town before everything is bought out. And it's also easier to escape from the enemy that way.
But I finally replayed the first two missions. I managed to give Railag Chaos and Summoning skills at the master level, as well as Education + Mana Attraction and Luck at the maximum level. Shadia didn't become an Expert in Chaos, but she does have Inspiration. After spending almost all my mana, I took the first town with a Phoenix and spells (the enemy hero was a real pain, constantly hitting me with lightning:mad:, and because he was so fast, I had to spend mana and immediately cast Meteor and Earth Shock). On the second day, a blue hero came to Railag's castle to check things out; I defeated him with one Phoenix:smile19:, but I was left with only the bonus witch and three hydras hired right before the battle. But I won. One day later, a third hero appeared on the left, slightly less annoying and painful. I somehow defeated him, leaving myself with one hydra:smile19:. In the end, I have Railag with one hydra and Shadia with one minotaur. :) But for now, no one is attacking. :)