Boris K
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Arengar, I level up both education and spellcasting for my Warlock. In my Raialag's campaign in the original game, even with maxed-out spellcasting, some battles required 150-200 mana. And education itself is useful for any race, if there isn't something more beneficial. If Raialag didn't have innate defense, I would have tried to level up empathy.
If you're going to level up a mage for Special Ability (SA), then you shouldn't level up any magic. I don't remember how it was in 1.0-2.1, but in 3.0, magic isn't needed for SA. It's just dangerous. Even against some neutral creatures, I feel very uncomfortable without high-level spells, not to mention strong heroes. However, on maps with a mentor, you can level up to the desired level with magic and then immediately get SA. But it costs a lot of money. And without a mentor, you can end up without SA and without magic if you're unlucky.
If you're going to level up a mage for Special Ability (SA), then you shouldn't level up any magic. I don't remember how it was in 1.0-2.1, but in 3.0, magic isn't needed for SA. It's just dangerous. Even against some neutral creatures, I feel very uncomfortable without high-level spells, not to mention strong heroes. However, on maps with a mentor, you can level up to the desired level with magic and then immediately get SA. But it costs a lot of money. And without a mentor, you can end up without SA and without magic if you're unlucky.