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Somebody has built a device that lets any old mortal trap a demon. The angels get word that such a device will appear at a tech convention. All they have to do is show up and find it. Sounds easy. But the devil is in the details...Vanity of Vanities is a stand-alone adventure but also forms part 3 in the Chains of Ezekiel campaign, that begin with the Devils Own Luck and continued to By Demon's Driven.  You need the Relics core rules to play.