As for the differentiation between Pariahs and Blanks: The frequent mixing-up and overlap of the Pariah/Blank/Untouchable definitions in the background (when described as an Untouchable/Blank in the Eisenhorn books, Alizabeth Bequin is described more along the lines of OP's definition of a Pariah), and the fact that Culexus assassins have been referred to as all three) makes me think that it's just different authors' takes on the same phenomenon. The lack of consistency is likely due to both the fact that Pariahs received relatively little attention in the background before 2001-2002, when the first Eisenhorn novel and the first Necron codex (which, IIRC, introduced the "Pariah" terminology) came out, and because the degree of psychic negativity varies between individuals (confirmed in a number of sources, e.g. Ravenor Rogue, and the book that included the Assignment scale - I forget the name). The idea of them being two separate things appears to be nothing but fanon that's arisen from GW not getting its **** straight.
As for the question, I think that Marine Pariahs wouldn't necessarily be Librarians (although I can see them being stuck in similar archivist duties due to the whole social outcast aspect), but the idea of them being used by a chapter as some sort of psyker-killer specialist has always intrigued me. They would be incredibly unlikely to make it through initiation for a number of reasons, though:
1. They are frequently shunned, and often end up not surviving until adulthood, due to the anti-psychic field (and the accompanied freak-out effect) that they project. I'd imagine that finding one in a fit enough state for SM recruitment would be a once-in-three-dozen-lifetimes phenomenon. However, if (The Emperor's Gift spoiler!), then it may possibly work.
2. The Librarians can't read them. We can assume that Pariahs will be all but entirely resistant to Chaos unless they are somehow burned out, but even beyond that, Librarians still have to psychically examine them to determine mental suitability. The Imperium learned its lesson about recruiting sociopaths into SM Chapters after what happened with the Night Lords during the Great Crusade/Heresy, after all.
3. Pariahs are bleedin' rare!
As I've said, the terms do seem to be referring to the same thing, especially considering that the definitions and names have often used interchangeably in some books (e.g. some of the Ciaphas Cain novels), and that Culexus assassins have been referred to as all three (the old Assassins codex referred to them as both Untouchables and Blanks, and they've been called Pariahs in all of their Horus Heresy appearances). Also, as I said, the varying approaches to how, exactly, their abilities work seems to be more along the lines of different author interpretations - in fact, the only time I've seen them NOT being used interchangeably is in fan speculation.
Use of any one term seems to be a matter of author preference, from what I can tell.
Individuals who exhibit a level of negative psychic presence being refered to by a number of different terms needn't be any more surprising than psykers being refered to as wyrds/witches etc.
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#1 - The first rule of Warseer is, you do not talk about Portent.
#2 - The second rule of Warseer is, you DO NOT talk about Portent.
#3 - If someone uses l33t, the conversation is over
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#5 - Math-hammer is bunkum
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#7 -If it works, somone will steal the idea
#8 -If this is your first time at Warseer, you have to ask a stupid question.
There is no background that explicitly states that a Blank of any degree cannot become an Astartes. However, the concept of Blanks has been around for a long time. Earliest I can remember is the Eisenhorn Trilogy. That was published back in 2001. I don't even know if that was the first publication with blanks in it. Codex: Assassins was published in 1999 but I'm not sure if the Culexus were even officially codified as Blanks/Pariahs at that point. Either way, the concept of Blanks has been around for over a decade. There have been how many Astartes codices and novels in this time? I suppose its a bit of a logical fallacy but I cannot help but think that if it was possible, it would have happened by now. I would think that the Pariah Gene leaves the human in question incompatible with the gene seed. Hell, not every normal human is compatible with the gene-seed. Its a bit of a selective thing and the human body isn't the most receptive to implanting foreign objects into it. I mean, that's why they genetically screen their candidates. So that they won't waste gene-seed on those that would reject it and/or die.
I would point out at this point the gene-seed is modifier primarch tissue as all the primarchs were psykers of one degree or another it follows that to be genetically compatible an aspirant would at the very least need to be a Rho level (normal human) or higher.
If you think about it, it would even make some sense if a slightly higher psionic rating than normal was actually a requirement of compatibility, that being part of the requirements would definately explain how rare successful aspirants are said to be.
I made a Genestealer Cult! --- 2nd edition Tyranid army!
Mat Ward Fact #27- His super power is invulnerability, his only weakness being an allergy to Halflings.
Guild up and join the Mat Ward Defence League!
"As I've always said, Wes is wise." - Scryer in the Darkness
"Wes, if you keep this up you'll need to change your name to MajorWiseJanson." - Azzy
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Statistically, you could easily call your Librarian a Pariah/Blank because of the psychic hood and maybe selective use of Shrouding.
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"As I've always said, Wes is wise." - Scryer in the Darkness
"Wes, if you keep this up you'll need to change your name to MajorWiseJanson." - Azzy
"Many boffins died to bring us this information." - Forgeworld Announcement E-mail
"Rest assured, Servitor 13 has your best interests at heart. Now let's fire up the lascannons." - GW changes their web privacy policy.
Yeah, I was going to post more. Rule-wise, a Blank would act like a cross between a really good Deny the Witch save and Dark Eldar Crucible of Malediction,
"As I've always said, Wes is wise." - Scryer in the Darkness
"Wes, if you keep this up you'll need to change your name to MajorWiseJanson." - Azzy
"Many boffins died to bring us this information." - Forgeworld Announcement E-mail
"Rest assured, Servitor 13 has your best interests at heart. Now let's fire up the lascannons." - GW changes their web privacy policy.
Weren't Pariah just Blanks captured and converted into cyborgs by the Necrons?
'Pariah' as a term for a psychic negative (blank/untouchable/null) pre-dates the introduction of the Necron Pariah by some years (first being used in 2nd ed. Codex: Assassins AFAIK).
All Necron Pariahs are pariahs, but not all pariahs become Pariahs.
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I made a Genestealer Cult! --- 2nd edition Tyranid army!
Mat Ward Fact #27- His super power is invulnerability, his only weakness being an allergy to Halflings.
Guild up and join the Mat Ward Defence League!
some people seem to have a problem with a pariah surviving long enough on say, a death or savage world to live to even become an aspirant, but what if their power actually helped them in the fight for survival. After all we do know that a Pariah's families don't just all abandon them upon birth (or else there would be none at all), so if he survived to actually become a warrior, I imagine that the ability to unnerve/frighten his opposition might indeed help him survive duels/fights, and maybe even give him an edge in Trials.
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Thought the exorcists chapter were all blanks as they get possed and then excorcised as part of their induction,so it is possible to have blanks as space marines. Though I supose they wouldn't have any pyskers though.
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That doesn't make you a Blank, it makes you immune to possession afterward.
...............................This is a link to the Forum Rules.,,,,,,,,,,,,,,,,,,,,,,A Tale of Guilders plog
Are they possessed before or after they're made into Space Marines?
Pro-actively transhumanist and an Immortalist
The fable of the dragon tyrant explains why. Text. Youtube.
You and I have opportunity to create synergy