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How and what should Dark Elves develop to counter Mages, if the Mage hero is either Orak or Razazak?
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For magical factions, leadership not only strengthens the army but also, due to empathy, allows the hero to act much more frequently. Moreover, a mage with empathy will be stronger than a Sorceress with the same empathy. He also has units with morale and much more mana. That's why the leadership chance is only 2%. Just avoid encountering a Necromancer with Creature Attack (CA).
Plus, a mage can cast spells on creatures to increase their initiative and morale.