Dark Elves vs. Mages.

In 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 more powerful than a Sorceress with the same empathy. His units also have high morale, and he has much more mana. That's why the leadership chance is only 2%. Just avoid encountering a Necromancer with the "Cure" spell.