Hoodoo
Voodoo
Black Magic
Chaos magic ect ect.
They always require
Blood. Blood blood blood blood.
Demon says, you want me to do what?
Ok, but I require blood.
Ok, then I require more blood
What no blood?
Ok I'll take your kids
No kids? Ok I'll take closest loved one
No loved ones? Ok fuck you you I'll take you.
Blood it's a thing with them.
Mostly because it brings the magician into a further deeper and more damned state.
Then demon goes before El and says LOOK! Your precious loved ones made in your image and how they mock you!
The Occultist is told that they will never reach the pinnacle of perfection trying to be holy. So they are told that by even more despicable acts that they will be obliterated and cast into the Lake of Fire with Lillith. And there, they'll be reunited with Divine One.
Interesting theory.
Another theory is that devil is a liar.