Ezekiel 28:11 begins an interesting discussion that initially seems to be about the King of Tyre, but the end of verse 12 shows that the context is speaking of the leader (Satan) of fallen spirit beings:
"Moreover the word of the Lord came to me, saying, " Son of man , take up a lamentation for the king of Tyre, and say to him, 'Thus says the Lord GOD: You were the seal of perfection, full of wisdom and perfect in beauty.
"'You were in Eden, the garden of God. Every precious stone was your covering: the sardius, topaz, and diamond, beryl, onyx, and jasper, sapphire, turquoise, and emerald with gold. The workmanship of your timbrels and pipes was prepared for you on the day you were created.
"'You were the anointed cherub who covers. I established you. You were on the holy mountain of God. You walked back and forth in the midst of fiery stones. You were perfect in your ways from the day you were created, till iniquity was found in you.'"" (Ezekiel 28:11-15)
The devil is being discussed in these verses because he was the one who walked in the midst of the stones of fire at the throne of God on his holy mountain. Verses 18 and 19 of the same chapter state that God will make the devil into ashes and that he will be no more:
"' . . . And I turned you to ashes upon the earth, in the sight of all who saw you. All who knew you among the peoples are astonished at you. You have become a horror, and shall be NO MORE forever.'" (Ezekiel 28:18-19)
This certainly is a strong indication that the devil can be put to a final death (destroyed) even though he is made of spirit.
Ezekiel 18:20 says that the soul that sins shall die. If this word soul would be translated as LIFE FORCE then it might be speaking to the angel realm as well as the human realm. Only God can prevent humans from being resurrected into a new body containing that human's life force and only God can remove the life force from the angelic hosts.
Satan convinced one-third of all the angelic beings to follow his rebellion (Revelation 12:3-4). Most of the rebellious spirits, now called demons or devils, have been incarcerated in a bottomless pit until such time that the Father will permit their release for their judgment:
"But I want to remind you, though you once knew this, that the Lord, having saved the people out of the land of Egypt , afterward destroyed those who did not believe. And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day;" (Jude 5-6)
I can find no scripture that says evil, unrepentant spirit beings will be in torment or tortured forever.
When the elected saints have been raised into their spiritual bodies at the first resurrection they will not only help judge the world but also spirit beings. The apostle Paul stated this in 1Corinthians:
"Dare any of you, having a matter against another, go to law before the unrighteous, and not before the saints? Do you not know that the saints will JUDGE the world? And if the world will be judged by you, are you unworthy to judge the smallest matters? Do you not know that WE SHALL JUDGE ANGELS? How much more, things that pertain to this life?" (1Corinthians 6:1-4)
Suprising though it may seem, the angels look forward to the day when the elected saints will teach them the deep things of God. Peter tells us that they want to understand these things but they do not even understand why they are doing what they are doing:
"Of this salvation the prophets have inquired and searched carefully, who prophesied of the grace that would come to you, searching what, or what manner of time, the Spirit of Christ who was in them was indicating when He testified beforehand the sufferings of Christ and the glories that would follow. To them it was revealed that, not to themselves, but to us they were ministering the things which now have been reported to you through those who have preached the gospel to you by the Holy Spirit sent from heaven - THINGS WHICH ANGELS DESIRE TO LOOK INTO." (1Peter 1:10-12)
Angelic beings were not promised to rule the world to come or to be sons of God:
"For He has NOT put the world to come, of which we speak, in subjection to angels. But one testified in a certain place, saying: 'What is MAN that You are mindful of him . . . ' " (Hebrews 2:5-6)
There will be a day that even the angelic world will be judged to see if they have obeyed the laws of God, especially the Ten Commandments. Why do they need to be judged? Because at least one third of them have sinned and deserve death. Who will do this judging? Those who have entered into the Kingdom of God as spirit born children of God.