1. Air Magic (flight, haste)
2. Earth Magic (portal, restoration, explosion)
3. Intelligence (it's strange that no one seems to have mentioned it - it's an amazing skill)
4. Wisdom (all spells)
5. Sorcery (explosion is significantly enhanced)
6. Logistics (essential for everyone)
Further development depends on the map/castle.
7. Diplomacy/Leadership
8. Spell Power/Archery
I think it's a very good build; at least, it's never let me down.
Fire Magic, Water Magic - forget about them; they don't have enough good spells to justify investing in them. I don't take Navigation even if there's a lot of sea. If the map is large, then of course Diplomacy, if not, it's better to take Archery or Leadership; you can also take Luck, but that's a matter of personal preference. And I think that's all.
This build is more suitable for pure mages)):) That is, for heroes like Solmyr and Loian. Heroes from the Dungeon faction can replace some of these skills, for example, by taking Defense or Attack, and for the Citadel (if someone wants to turn a barbarian into a mage), Tactics/Ballistics would be more suitable.
Artillery - :smile18: