User blog comment:SniperGhost/Attention- new info reguarding blanks and pariahs!/@comment-1745925-20100918020012/@comment-1745925-20100919133100

Wait... Pariahs have no souls yet are still psykers?

This is more confusing than the grappling rules in D&D. Psykers have souls. That's theorised to be one way they gain their powers.

With the soul-consuming, they do that because they feel the need to fill the gap within their souls. That's the Thirst. The side effect of it is the reversal of ageing. Side-effect of not consuming souls is being driven mad by the Thirst. It follows to logic that once the soul is completely gone, no thirst. Mental instability? Yes. Just... yes.

Also, about them being invisible, Daemons see through souls. If someone has no soul, Daemons wouldn't be able to see them. I'm unsure, but I believe one form of psychic detection works along a similar method, that is, of detecting souls. Others include detecting heart rates, so on so forth. Therefore, if a Pariah disrupts psychic powers, they wouldn't be able to detect them. They might detect the disruption. I don't know. I'm not psychic.