They have as king over them the angel of the bottomless pit. His name in Hebrew is Abaddon, and in Greek he is called Apollyon. The first woe has passed; behold, two woes are still to come. Revelation 9:11-12 (ESV)
"The dark power at first held so high a place that it could wound all who were on the side of the good and of the light.
But in the end it perishes of it's own darkness, for evil must itself fall at the very moment when it has wholly overcome the good, and thus consumed the energy to which it owed it's duration." - The I Ching: Ming I / Darkening of the Light (36).