Billie

"You and Dean dying and coming back again and again. The old Death thought it was funny. But now there's one hard, fast rule in this universe. What lives...dies."

- Billie to Sam Winchester

Billie is a reaper. Sam Winchester heard her singing "O' Death" in Nuckolls County Medical Center while she was reaping the souls of the dead caused by the release of the Darkness. She told him that despite being disappointed over him and Dean killing her boss, Death, people were still dying and would have to be reaped. She also told Sam that him and Dean would no longer be able to continue dying and coming back, because while the old Death found it funny, she said that what lives will die. She claimed that when Sam or Dean die, whatever reaper got the privilege to reap them wouldn't send them to Heaven or Hell or even Purgatory, but send them to the Empty, where there would be no coming back. She also told him that he was dying, and was "unclean in the biblical sense" and hoped to be able to reap Sam herself. Her words ended up giving Sam a clue to a cure for the rabid infection and he looks up purifications from the Bible. This led him to try Holy Fire as a cure, and it worked.

Appearances

 * Season 11
 * Form and Void
 * The Devil is in the Details