- It seems they were more damaging to all psykers (even friendly) in previous versions
- It would seem that the assassins have more abilities than the sisters. Everything does explain that the pariah abilities can be more developed and stronger. This could be an identification at a limit to abilities.
- It would seem that units with the pariah ability were never able to be targeted due to their abilities. This tips the scale more in the unlimited arena.
- Having a bunch of them in the same place either stacks their abilities, extends the range, or some combination of the two. Though I might be more inclined to say that it is possible for the choir of the Astronomicon to drown out the pariahs and this would also put a limit on their abilities.
- Now I don't know for sure!
So I got a hold of my Codex Assassins (3rd Edition) and while I am sure GW has made updates to the order since here is a relatively quick review of what I found. I will also add after what is relevant from the new Index: Imperium 2 section...
Codex Assassins (3rd Edition)
- Page 20: When the Imperium first began to gather pariahs the High Lords found that all of them gathered in one place (their experimentation cells) the began blocking out the Astronomicon. This is when they began to understand the full extent of their power (However at the same time this also does demonstrate that at the very least more in one place extend the reach of their powers, if not simply stack their abilities to become more absolute... though the description does not really identify one way or the other)
- Page 22: Soulless Rule states that even non-psykers are affected and take penalties when doing something near a Culexus assassin
- Page 23: Psychic Abomination rule says 1. Tyranid Hive Tyrants can be permanently severed from the hive. 2.All psykers must pass Terror tests just because they start the turn within 8"
- Page 24: Warp Disturbance Rule says all psykers (even friendly) must roll each time they try to use a power if they are within 24" and in addition to failing the attack they can take a wound if they fail.
- Page 24: Life Drain Rule says that they can drain characteristics (WS, BS, S, T, LD) after rolling and the lost points are both lost for the remainder of the battle and can lead to death.
- Page 24: Daemons section (might have a mis-type in the beginning?) Says first that the assassin special attack does not affect daemons that are psykers; but then it says 1. this includes (daemon types) because they do no have psychic abilities 2. special attacks by the assassin count as psychic attacks and daemons receive no saving throw based on their daemonic aura
- Page 24: The assassination of the master of the adeptus astra telepathica section says that while connected to a life support system the master of the astra telepathica had his powers fully negated for life by an assassin that "blinded" his sight... the effect lingered after he was released.
Index: Imperium 2 (Pages 112 and 115)
- Abomination ability: can not be targeted by psyker powers and enemy psykers must subtract based on tests
- Life drain: only keeps models from making armour saves
- Etherium: all units WS and BS skills suffer when attacking this unit
- also mentions that the Culexus assassin saps away a psyker's very life force
- Warp presence cancellation is total.
- There is no limit.
- All powers of the warp are cancelled.
- Physical manifestations can still exist around them.
- They are not the "final solution" to the problems of the warp.
So blanks/pariahs/nulls/etc. are all the same thing. They have no presence in the warp and furthermore repel the warp in its entirety. Everyone feels uneasy around them, even normal people with limited existence in the warp. Should an individual that has a significant presence in the warp come close enough to one of these individuals they will feel pain, headaches, etc. and find their abilities fully suppressed. This applies to ALL - Magnus, the Emperor, daemons, the Chaos Gods, etc.
Even in 8th Edition Sisters of Silence have the psychic abomination trait. This says
Psychic Abomination - This unit can never be targeted or affected by psychic powers in any way. In addition, enemy Psykers must subtract 1 from any psychic tests and Deny the Witch tests they take fro each unit with this ability that is within 18" of them (to a maximum of -4). Note however, that this ability has no effect whilst the unit is embarked upon a transport.
This is one of the reasons that Leman Russ was pretty much always found to have a band of Sisters of Silence in tow wherever he went. Though he himself had a presence in the warp (I believe the first instance of this was revealed in the novel A Thousand Sons by McNeill) he mainly kept his abilities suppressed and let his physical abilities speak for themselves.
While those with a significant warp presence (Magnus, the Emperor, etc) would all find their abilities suppressed it does not "take them out of the fight" completely. It merely means that they have to kill with some other means while they are near.
In addition, physical manifestations created through powers of the warp are unaffected by blanks. After they have been created or summoned anything (not including projections and such) with a tie to the warp will still exist. Once a daemon has been summoned it exists in a dimension separate from the warp and technically it has no tie to the warp anymore. It can still kill you even if you are near or are a blank.
However, I can not remember where I read it but I believe that a daemon or warp entity that is killed in the presence of a blank can not return to the warp and is therefore truly destroyed. Typically they are simply banished from "our" dimension and return to the warp where they can be summoned once again. (I have no source for this currently; I will see if I can find it...)
Despite their abilities blanks are not the solution to the problems of the warp. Since all someone would have to do is summon a fireball in the sky above them or a daemon in the "next room" and kill a blank in an "indirect" manner without taking warp abilities close to them.