User blog comment:SniperGhost/Attention- new info reguarding blanks and pariahs!/@comment-1745925-20100918020012/@comment-1932673-20100921154312

A pariah disrupts the warp currents around him, frequently drawing the currents into themselves, thats how an animus works and how pariahs sap other psykers' strength. This means daemons 'see' pariahs by detecting the disruptions they cause. Also a daemon would be able to feel a pariah by tracing their blankness or disruption to it's source.