Drug Digen Farris was allergic to. (Source: Unto Zeor Forever, Ch 11) The Farris mutation (channel, renSime and Gen alike) is accompanied by extraordinarily sensitivity to all stimuli. As a result of that senstivity, Farrises tend to be allergic to many common things. Thus an entire pharmacopia is developed for use by Farrises, (packaging marked with the Farris Black blazon, stripe, or border).
(Source: Index card file, Unto Zeor, Forever) Also a selyn conductor.