Let me preface this by saying that I haven't read any of the 40k novels....just the fluff from the mini's game and DH itself.
Now, how much authority does an individual Inquisitor actually have? I remember reading from old school 40k (back when the mini's game was a single book named Rogue Trader) that they have enough authority to coopt entire Astartes companies (100+ Space Marines), can countermand anyone up to (and possibly including) a High Lord of Terra, have the Officio Assasinorum at their beck and call (to the tune of having Eversors reserved in cryo "on call"), and can even have a planet magnamelta-ed/viral bombed with a single request.
Obviously, if this were the case they wouldn't be relying on PC's of DH power level if all of this were true.
Now I know that the ultimate answer to this question is that the Inquistors in my game have as much power as makes the story interesting and challenging for the players -- but what do you think? How do you handle it?


