Apollyon

"'And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek tongue hath his name Apollyon.'—Revelation 9:11. Here, then, the Allegory means to depict a conflict with the powers of hell, with Satan himself. It is one of those fierce assaults of the devil with which he seeks to recover his lost prey, and if not this, to destroy them. The name APOLLYON means 'The destroyer.'

The description of this monster is conveyed in a sentence that gathers into itself the accumulation of all those characteristics of Satan that are most hideous and horrible, deadly and dangerous. The scaly leprosy of the old serpent covers APOLLYON as with a coat of mail. He had 'wings like a dragon,' to indicate the rapidity of his flight, and the ravages of his march; 'feet like a bear, for softness of tread, and strength and power to injure; 'fire and smoke' came forth from his nostrils, representing the inner fire that burns within the breast of the fallen angel, and his very breath tells of the fiery realm he rules, and the fiery wrath he wields; “his mouth as the mouth of a lion,” the rampant, raging, roaring lion, seeking whom he may devour."[1]