May you have peace!
The Adversary has not been destroyed... because there is only one way to destroy spirit... FIRE! And not the kind of fire we have in the physical realm, but that of which the physical is a 'copy'... the REAL fire, which hails from the Lake of Fire, which exists in the Heavens, and into which Satan will one day been hurled.
That is why my Lord said, "Do not be in fear of him (Satan, and by default, his 'children') that can kill the body (the flesh, the physical body), but be in fear of Him that can kill the body (the physical, fleshly body) AND THE SOUL (the <i>spiritual</i> body)... in Gehenna!"
Thus, that is why Peter said that earth 'that is now, is stored up for fire." What does that mean? Every living thing has two (2) bodies: a physical one and a spiritual one. <B>1 Corinthians 15:40, 49</B> Contrary to what you may have been told, however, although the <i>physical</i> body dies and returns to the dust, the <i>spiritual</i> body only 'sleeps' (albeit, in different places for the unrighteous and the 'holy ones' and prophets), until such time as it is 'resurrected'. <B>1 Corinthians 15:51; Ecclesiastes 12:7; Revelation 6:9-11</B>
And upon resurrection, such spirit body will live either everlastingly... or be 'hurled into the Lake of Fire' for everlasting destruction. <B>1 Corinthians 15:35, 42-46, 51-54; Revelation 20:11-15</B>
Also, too, the spirits that are 'reserved for judgment', those in Tartarus, as well as those who were hurled down with Satan - no, they are not the same: the first group was precluded from reentering the heavens and reserved in darkness; how then could they be 'hurled down' from it at some later date? - will be DESTROYED... Gog AND Magog... when 'fire comes down from HEAVEN', from the Lake of Fire... and destroys them. <B>Revelation 20:8, 9</B>
Such intensity and power is wrought by this destruction of the spirit... that my Father, JAH OF ARMIES (Psalm 68:4), has reserved it until that 'last day'. At that time, all things causing wickedness will be destroyed by this 'fire', either by being consumed by it, or by being hurled into it. Its intensity will result in their being a NEW heavens (the spirit realm being cleanses of wicked spirit forces) and a NEW earth (all <i>wicked</i> flesh that still has its spirit in it being destroyed).
And finally, as the last 'enemy', Death, the 'father' of the Adversary... will also be thrown into it. And thus, 'Death... will be no more... neither mouring, nor outcry nor pain...' For these things will have 'passed away'.
I bid you peace.
Servant to the Household of God, Israel, and a slave of Christ,