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The Warlock has a good Summoning skill. He has more spells (45%) than the Wizard (30%). However, he might have mana problems, especially at the beginning.
It's true that Wizards can master any magic, but they won't level up all four schools. And you have to survive until you reach the super ability. My friend likes to play as Wizards (Oroy). He usually focuses on only one magic school – Light or Summoning. I usually play against him in Hotseat mode as the faction I'm playing in the campaign. Currently, I'm playing as Warlocks (Irunye).