Recently, I've been re-reading the book Blind, which focuses on a station owned and run by the Adeptus Astra Telepathica, and they talk about Vitifers very often. In the book Vitifers are stern, silent people who have had many of their emotions removed (or train to ignore them, it doesn't specify) except for (if I recall correctly) Patience and Vigilance. They are there to, if needed, kill any Astropath who becomes possessed or goes mad, etc. They are always hooded and masked, with guns always ready.

I searched all around, but from what I can see Vitifers only appear in Blind. Has anyone else read anything about the Vitifers or with vitifers in it, or are they unique to this one book?