When using "See Me Not" the text mentions the psyker cannot be perceived in any way, which would seem to provide attack penalties beyond just the attacker being effectively 'blind' against the psyker (since they couldn't hear / feel / smell (psychically sense?) them either)
Didn't see anything in the errata, is there a consensus on what the penalty would be? And whether there was any way for the poor foes of our psyker to help mitigate the penalty? Or limitations on the power that I'm overlooking?