What is your favorite ultimate ability for that class?

Why no magic, gentlemen...? For a single-unit army, a mage needs machines, spells, and education. You'll choose two skills yourself, but I usually take luck and one of the magic schools – Chaos or Summoning. It's designed so that a single-unit army is somehow easier to obtain for Narhiz; it's set up so that he takes Mentorship. Yes, you can't take Wisdom, but you'll get everything later. And regarding general spells... Why do you need them if you have Dominate, Resurrection, Phoenix, and Earth Shock at the highest level...? Another option: Holy Word, Vampirism, Summon Elementals, Meteor Shower... and many more...