4uta
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I personally prefer Vidomina among the Necromancers. Then comes Isra, Tant (mysticism is not really necessary), and Septienia is good against living creatures with her wave of death – she's great in the early weeks (but only as a secondary hero).
Castle - Adel
Rampart - Eleazar
Tower - Solmyr, Kira, Doremi
Inferno - Aiden, Zidar
Dungeon - Zheddit and Alamar with resurrection
Stronghold - Dessa
Fortress - Andra, Stig
Elemental - Ciel, Grindan, Jelar
In short – mages with intelligence, earth, magic, and diplomacy.