Even Hell has its groupies. Those who see legendary suffering as a romantic enterprise. They are often romantic figures themselves: intrepid adventurers, powerful men accustomed to controlling other men, doctors carried away by their researches into the mysteries of the mind and the flesh, seductive women unable to resist the temptations of their own powers of seduction.
They want to be a part of the game. They want to be on a first name basis with the Cenobites. When they learn enough, they usually want to be Cenobites themselves.
Often they will possess a puzzle box of their own, whether or not they have the courage to take the final step of trying to solve it. Sometimes they will have many boxes - collecting is frequently a compensation for those who are afraid to take the final step into full partnership with Leviathan.
And of course, these agents will sponsor the return of the hellbound to our world, that they might participate vicariously in their transfiguring pain. Like Dr. Channard, they will hunt down the point of departure where hooks and chains tore a candidate from this world into hell, and supply the necessary materials to bring them back through this portal of blood. By and large, the agents have no compunctions about fact that the 'necessary materials' are the blood and flesh of living men and women. They feed them like fragile orchids of blood and sinew, watching them grow into a close facsimile of their previous humanity.
That the returned invariably turn on their sponsors and deliver them to unspeakable fates has not deterred any agents yet, nor is it likely to in the future. Like all groupies, they are a dedicated and single-minded bunch.