Then Death and Hades were thrown into the lake of fire. This is the second death. Revelation 20:14
Even more to the point, Death and Hades are not living, tangible people who can suffer pain in a lake of fire. The Revelation used ‘Death’ and ‘Hades’ to personify, well, death: the state of being dead, the act of burial and decomposition, the entropy of living things. By showing Death and Hades giving up their prisoners and themselves being thrown into the burning sea (Revelation 20.14), John was symbolizing the death of death, where the ‘second death* overtakes the first one. When the resurrection occurs, the whole concept of ‘death’ will be rendered obsolete, ceasing to exist (cf. 1 Corinthians 15.26,54-5 5).
The beast, the false prophet, and Death and Hades, were symbolic personifications. Empires and cults don’t have bodies to be burned; an abstract concept like death doesn’t have feelings to experience unending pain. To literalize the symbolism in Revelation 20.10-15 completely misses the point.
From “Jesus and the End of Death” by Mark Edward http://amzn.to/2A5ZmuV