What would you change in Heroes of Might and Magic IV?

I would change the Grail. Besides the Grail, Necromancer, and Barbarian, the others are just boring and, essentially, don't offer anything besides 3000 gold. It would be great to make it so that classes give more powerful bonuses upon reaching a high level. For example, let's say a Dark Lord, upon reaching Grandmaster of Death Magic and Grandmaster of Nobility, reduces enemy morale to a minimum at the start of a battle. Just like in Heroes 3, the Angel Alliance gave a blessing at the beginning. Here, the hero simply gains the ability to cast Despair upon attacking, and upon reaching Grandmaster of both skills, casts Despair on the entire squad at the start of the battle.