I'm leveling up my Necropolis faction like this:
Darkness - Mind/Curses
Sorcery
Attack - Frenzy/Steel/Speed
Education - Mana Attraction/Scholar/Raise Dead
Summon or Luck (depending on who you're playing against) - mainly relies on the Dread Lord (-2 to luck with a scream, -1 deadly misfortune, and -2 cursed ring).
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