Don't need to be a pariah to use it, an untouchable could use it as well it'd just be a little weaker since my aura is weaker.
But I'm hoping I can acquire one somehow because it would make my character totally awesome and able to kill just about anything with 1 shot.
Especially Daemons and psykers.
Maybe I can get the inquisition to get me one or something later into the game.
It wouldn't just be weaker. It'd be unusable. Because it requires you to focus your power. Untouchable is just a void. A Pariah is
more. They can focus their untouchability, with training.
Divine Shot. Basically, that power? I can shoot Abaddon with it. From /anywhere/. Just as long as I can see him.
Although I have the impression it would be better and safer against Gabriel than against Abbie.
@mesor: To give you an idea, one of the Ascension Paths for after an assassin goes beyond Rank 8 (after 14,999 exp) is exactly the famed Vindicare Assassin. I don't remember any career taking to the path of the Culexus, though, it may be in a splatbook I have no access to.
So, I guess that gives you an idea of how hard it would be for you to get your hands on that kind of equipment.
Culexus is not given in any splat book.
What does flagllent do?
You must spend 20 minutes in prayer and self-flagellation each day, dealing 1 point of damage to yourself that you cannot heal (for that day, I believe), for which you gain a +10 to Willpower tests to resist Mind Control or Malignancy, plus if you have Frenzy, you can enter Frenzy as a free action. If you don't do the self-harm, you get a -5 to all tests.