Called "The Destroyer" and, in the Book of Revelation, St. John called him the King of the Locusts. Abaddon has also been identified as the angel of death and destruction, demon of the abyss, and chief of demons of the underworld hierarchy, where he is equated with Samael or Satan. In magic and alchemy, Abaddon is the Destroying Angel of the Apocalypse.
Abaddon referred to the pit or cave that was used in mystery religions and schools as a rite of passage into the greater mysteries. Often the experience would entail the use of ritual substances that put the aspirant into an altered state in which he or she could receive divine revelation. Because the experience was sometimes unpleasant, this rite came to be viewed as being "hellish." However, it was considered absolutely necessary so that the seeker may become pure enough to encounter the "mind of God", as an angel is described as the "Angel of the bottomless pit who binds Satan for a thousand years". (Wikipedia)