I searched for this, but there isn't an entry.
Psy Power d10 damage!
That's pretty brutal - and I say this in the context of the Mendacious Oracle that's the main villain of the first adventure! Even though the heretics will encounter an NPC group of Word Bearers, the book leaves them to deal with his guards (as if he wasn't enough!) and the heretics to confront him, and he's already pretty tough without this power (he has others and a forcefield that doesn't overload).
Ok, I get that it's a high level psy power and that people that acquire it are going to be the baddest of baddass! But at the very least the damage output is (iirc) 5d10! Comparing that to regular weaponry it seems to have no equivalent. WIth a penetration of 9 (!) it's pretty much a one shot kill. Now I guess it's intended to be used against really tough monsters like daemon princes and necron lords and what not, but there's nothing to stop it from being used against anything: there's no mana cost equivalent for psy powers. Yes it's a bolt, not a storm/barrage but it's just so good. It's not even classed as Corrupting (which I think it should be), and at the level the psyker will be to use this he's going to have a very easy time attacking with it.
Am I wrong? I daren't have him fight in my adventure (I'm currently running False Prophets and had to design an 'out' for the heretics when they face him). There's only two heretics and he'll tear them apart in a turn!