Uhh well he can be affected (I mean indirectly) so he's not a full on blank if going only according to the book, which helps with balancing issues. There are two types of psychic nulls in the IMperium if I remember my lore correctly there are the naturally null these people usually are singularly effected by this and then there are the human the Necrons seeded into the population and their blood lines. The Pariahs which I think is more true to this have the AoE power and the psychic stench so to speak. Both are completely genetic if I remember correctly. I feel silly personally having looked at the Inquisitors Handbook and completely overlooked the Radicals. Oh well not a huge loss just curious now what I missed out on.<br/><br/><em>goes to read on</em>