1. Attack - Ranged Attack, Frenzy, Tactics.
2. Defense - Dodge, Resistance, Protect Us All - I took this at the very end, before the final battle.
3. Luck - Magic Resistance, Barbarian Luck.
4. Logistics
5. Diminishing Dark Magic - Hold, Weaken, Curse.
Leadership probably won't help... and there's nothing to replace it with... unless I remove the Dark Curse... I don't see the point in giving up on defense... because it really helps against paladins and griffins. The final battle is on the 3rd or 4th month.
I was thinking of replacing Curse with Education and taking Fire Wrath...
They level up Dark Magic purely because with that hero characteristic... when they took Light Magic, I could defeat them without much trouble...