What strategies do they use to avoid detection? How does one contact them? What role does the illithid play? GMs are supposed to be able to use this, so you need to provide the background details, not just what PCs might know.
Format wise, there are inconsistent capitalizations and spelling errors.
Using demons and summoned monsters to perform assassinations is a bit interesting, especially if the victims are PC's. Go to Comment
An interesting concept, but I have a problem with this.
This really only works with Impotent, incompetent, or Not Really Good gods. If you have a setting where the good gods are actually good, they would oppose this directly unless they were weak. And if they are weak, than evil should also be weak and a poor tool, or else evil would be the dominant force.
But for low magic/evil ascendant worlds, this could work.