Chaosmancer
Legend
For my own setting, I treat them as Asmodeus' chosen ones (mortal worshippers who he has plucked out of the general pool of LE types that become devils). [Assy's form when dealing with the raks is a big 3-headed rakhsasas.] His "official" religion pushes "give up a little security for a lot of safety", and is very respectable (way too respectable for most PC's to join). Assy uses raks to run the day to day activities (and to recruit the powerful to the religion), because they are more subtle than the devils. If He needs something bad done, that is for the devils and the other members of the Lords of the 9 (except his daughter), which his church teaches are really demons, and their warlocks. Assy's church has a lot of lawyers, so anyone who claims the devils are really working for Assy gets sued something fierce (and they have manufactured a lot of "evidence" that proves that isn't true).
That has got to be one of the better takes on Asmodeus ever. A church of lawyers who will sue you for besmirching their god's good name by associating him with those evil demons.
Truly, great evil is present at your table