Gunslinger
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Now, when I play as the Dungeon, I only use Chaos, because instead of a second school, you can take something better (besides, what do we need irresistible magic for? I'd rather bombard with Chaos than summon phoenixes or set mines), for example, Sorcery or something else. The only thing that makes me take a second school (Summoning) is to surprise the Orcs a little!