User blog comment:KillRoy231/Will we ever see Asmodeus?/@comment-10889355-20170504131626/@comment-1031724-20170504181340

Azazel took two seasons to kill. He was the series' first BigBad.

And remember, it took the Colt to kill Azazel, and the Lance of Michael to kill Ramiel, both of which are destroyed. And it took the power of Lucifer's child to kill Dagon, though he will likely be a presence in Season 13.