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A life in the Mags brings you far closer to temptation than your average Imperial citizen. Cartesian saw it as his job to make sure that his flock (as he liked to refer to them) remained true to the letter of the Lex and never strayed from the Emperor's light. Even before the heretics came, he would hold daily sermons, warning of the awful fate awaiting any who didn't heed his warnings. Now he simply has to point at the shambling hordes filling the streets.