He will be thrown into the lake of fire.
Answer:
The Lake of Fire is indeed the "initial" torment of the Devil and his demons, as they watch everything for which they've labored burned to ashes.
But, "eventually," the fire will go out, the earth will be remade, and "the blackness of darkness" awaits these wicked spirits.
"For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto Judgment..." (II Peter 2:4).
"...these are wells without water... to whom the mist of darkness is reserved for ever." (verse 17)
"...the angels which kept not their first estate, but left their own habitation, He hath reserved in everlasting chains under darkness unto the Judgment of the Great Day." (Jude 1:6).
"...wandering stars, to whom is reserved the blackness of darkness for ever." (verse13)
Devil's Third happened in 360.
Devil World happened in 1984.
Devil Dice happened in 1998.
Devil's Crush happened in 1990.
Devil Kings happened in 2005.
The Embodiment of Scarlet Devil happened in 2002.
Battle of Devil's Hole happened on 1763-09-14.
Battle of Devil's Creek happened on 1885-05-22.
Battle of Devil's River happened on 1857-07-20.
Jersey Devil - video game - happened in 1998.
Devil Fish - video game - happened in 1982.
The Devil Inside - video game - happened in 2000.