The Reaper Inquisition Force and Tribunal is a joint task force division of the Citadel fleet created to investigate and take down high priority threats. It is composed of multiple different species, finding the best of the best at what they do. In the field, they act as the judge, jury, and executioners.
Though it is similar to the spectre program, the Inquisition is designed to work as a small task force with some hierarchy rather than an individual making their own decisions. Their base of operations is on the CSV Caesetia, a repurposed turian vessel. As a member of RIFT, and part of the mysterious Operation: Event Horizon, your character's job is to follow the orders passed down by the council and attempt to find some way of escaping the organic extermination.