Sam sighed, a little. Really, he didn't know much about Lucifer from personal experience. And he sure as hell wasn't going to tell someone he didn't know that he was apparently the true vessel for the Devil. That was really not something he needed getting out.
"Lucifer is pretty much what you read in the Bible, you know? Fallen Angel, total douchebag, wants to destroy all the humans. He's very good at illusions and convincing people that his way is the truth. He hates humans, and values himself above pretty much everyone else."
It wasn't the world's best explanation, but it was a start.