http://www.vermintide.com/news/dev_blog_chaos_sorcery/

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CHAOS SORCERY

Chaos Sorcerers draw upon the full fury of the Winds of Magic. Unlike the tutored wizards of the Empire, whose rituals and rites offer protection against the ravages of Chaos, Sorcerers trust to their wits and the fluxsome favour of the Dark Gods to endure the ravages of raw magic.

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http://www.vermintide.com/news/dev_blog_chaos_sorcery/