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Ghlen Livid is a wine made from the Vul Nut, a reannual plant. Reannuals travel back in time, so Ghlen Livid can give it's drinkers a vision of the future, which is, from the nut's point of view, the past. It is brewed in the Agatean Empire and is first seen in The Colour of Magic.

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A reference to Roundworld's The Glenlivet. According to empirical tests the Roundworld version doesn't show any useful visionary effects. But it is rumoured that extensive tests are going on nevertheless.