"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
The book of Revelation equated Abaddon with Apollyon, and Cornelius Agrippa positioned him as the monarch in Klipoth, yon in the lower shadow of the Sephirah Tiphereth (Beauty) on the Kabbalistic Tree. Indeed, Tiphereth is governed by the Sun-Apollo (the Cosmic Christ) and the planet Venus-Aphrodite (Goddess of love and beauty).
Tiphereth relates to the Human Soul and the Heart in the physical body. The blood stream places the Astral Light (Apollo) “yon” Tiphereth-the Heart, there in Yesod-Sexual Organs.
Thus, Apollyon is the fallen Tiphereth (the Malachim, the human soul, the psyche) that receives the Astral Solar Light of Apollo (Christ) through the heart, and who thereafter squanders through the sexual organs by means of fornication and adultery (Lilith and Nahemah – Evil Beauty), the negative aspects of Venus-Aphrodite (sexual force).
"There we see Abbadon, the angel of the Abyss, who suffers in the chains and bonds with which he martyrized others." - Occult Medicine and Practical Magic
As described in Revelation, Apollyon (the fallen Tiphereth) opens the gates of the abyss (Klipoth) and unleashes upon the earth his swarms of lustful demons “locusts,” who then proceed to torture those of mankind who do not bear the seal of God (chastity) upon their forehead. After that, (by means of the Great Arcanum) he (Tiphereth, the Human Soul – Willpower - Thelema) is supposed (with the help of Apollo - Christ) to seize Satan himself, bind him and toss him into the bottomless pit (Klipoth) for a thousand years.