Ataman
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I prefer to take a warrior hero for the Necromancer faction, but magic is still necessary for him. After learning the Air Expert skill, there are no problems with slowing down enemies. It's true that you have to use the spell as the second action (if a slowdown is applied, it is removed by acceleration), but the hero is a warrior, so it's not that bad for him.
Well, if you have to attack, the "Tactics" skill helps a lot.
I agree about teleportation; it happens rarely, but you don't need to learn the Water skill; you can leave that cell for a better skill.