A campaign can go from literally impossible to a breeze with the correct skills chosen. Because heroes and their skill choices carry over, selecting the right skills is all the more important. You are limited to 8 skills. Once you've picked a skill you are stuck with it for the rest of the campaign, not just the map.
Heroes III Castle in UE5 by Radim Zeifart HeroWO: open source implementation of HoMM 3 in JavaScript Might and Magic VI: The Mandate of Heaven 25th Anniversary Late Pledge & Inferno Faction Might & Magic: Clash of Heroes - Definitive Edition fheroes2 1.0.2 III. Magic - level 3 mage guild; Spell restrictions: Curse, Disguise, Death Ripple, Animate Dead, Protection From Earth. rating: 6. IV. Grail building - increases a hero's attack and defence skills by +10 each when defending against a siege, increasing the defensive Fortress capabilities. rating: 7. G7Y8hG.