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No sane Warlock would specialize in Chaos. Precisely because Chaos is what is expected of them. Warlock maniacs recommend Necromancy, specifically Darkness and Summoning.
And, by the way, this guide is a bit late. Back in 2010, we, with Vaishon, Letos, Orson, and that other guy – the Sylvan sniper, oh yes, Ossir – were taking down Utopia in the first week, and then coming back for more dragons in the second.