Thanatos is a Greek God and the Son of Hades and Nyx. He is the God of Death, Reaper of Souls and a General in the Army of Hades. He is often noted to be the right-hand of Hades. Thanatos is the guardian of the souls of the Underworld. When souls escape the Underworld to Earth, Thanatos is the one who tracks them down and returns them. Also, when people escape death through subterfuge, as Sisyphus did, Thanatos is the one who drags them down to the Underworld.