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for me, at this stage, the ideal development scheme for a Necromancer hero looks like this:
1) Dark magic: Mind Control, Pain Infliction, Curse.
2) Logistics: This depends on your preference. You can choose Scouting and Keen Intellect if the hero has Education and Deciphering, or you can go for Pathfinding and Pillaging. Overall, this is a very flexible and not the most important point, but without logistics, even on small maps, it can be difficult.
3) Attack: Tactics, Archery.
4) Defense: Vitality, Hold Ground, Preparation.
5) Education, Sorcery, Summoning, Chaos Magic (depending on the hero, of course).