Inquisitors are the special agents for certain religions. Not all religions have an inquisitors within their religion. The major religions that have them are Helme, Reche, Justistian. some of the bad guy deities have their own inquisitorial orders.
Each inquisitorial order has a special name. Helme inquisitors are named Seekers, the Justintinan ones-the hand and the Reche are the Fist.
Most temples will house a inquisitor as part of the priests team. It is considered an honor to be assigned to one. Most of the Inquisitors are allowed free reign within their religion to ferret and seek out problems.