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Kyxa
From Warhammer 40k - Lexicanum
Kyxa is a mild narcotic and aphrodisiac that is smoked. The plant extract that forms the drug is taken from worlds in the Ultima Segmentum; and is far too costly for the average citizen to acquire. Constant use results in noticeable yellowing around the edges of the user's eyelids.[1]
Source
- 1: Faith and Fire (Novel) by James Swallow, Chapter Four, pg. 37