Satan will perish.
Eze 28:
18) Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee.
19) All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more.
Eze 28:
18) Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bring thee to ashes upon the earth in the sight of all them that behold thee.
19) All they that know thee among the people shall be astonished at thee: thou shalt be a terror, and never shalt thou be any more.
He brings him to ashes upon the earth and he shall never be any more.
It seems to my mind to war with being in torment forever.
That is why I said I thought the two verses were speaking of different points in time. And we do have verses about him being cast to earth, falling from heaven, and in great wrath over the time.