Speaking of a Soul being destroyed...
This is what the role of the Destroyer does...
Revelation 9:11
"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"
Apollyon is actually a 'Good Guy' character in the Bible in that his job is to destroy the Souls of the wicked. He works with God to perform this duty.
As a side note, Apollyon is also the 'Restrainer' that keeps the wicked from climbing back out of the Pit...
2 Thessalonians 2:7
"For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way"
Many Christians believe that the Restrainer is the Holy Ghost which is incorrect as God will pour out His Spirit in the Last Days...
Acts 2:17
"And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams"
Once Apollyon is taken out of the way, the Beast can escape...
Revelation 17:8
"The beast that thou sawest was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth shall wonder, whose names were not written in the book of life from the foundation of the world, when they behold the beast that was, and is not, and yet is"