Third Doom.
The Beast and False Prophet.
Revelation 19:20

"And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone."

Before the destruction of the army of the Antichrist, he and the false prophet will be cast 'alive' into the 'Lake of Fire.'  This shows that they are not systems but persons. They will be cast in without dying and will be still there and alive when satan is cast in 1000 years later.