Main problem for me is the lack of shadow spells and not being able to store bodies. =3
AAhhh ok, got it. But we should have an "necromancy tree" for that, i guess its not in Bethesda planning. Well, i can give you some advices. In my opinion, conjuration is fine with necromancy (raising dead bodies), better than previous games. You can choose few perks of another trees to fill your necromant abilities
1. Poisons in alchemy tree
2. Fear in Ilusion tree (you can stop in expert spells if you like, with dual-cast you can fear anything (with master of mind perk) but dragons.
3. In stealth tree you can pick "shadow warrior"
4. In pickpocket you can choose poisoned.
5. I would choose lightning spells in destruction, i always feels like dark spells to me (kind of "darkside of the force")
I dont know if it works, just trying to help your gaming experience.