"Arkham - Devil's Asylum"-
*At Arkham Asylum, a patient named Kryppen sits in his cell talking to a wall. Jeremiah Arkham monitors the man, but doesn't hear anyone speaking back to him. Kryppen however, hears the ethereal voice of the demon Neron. The patient offers Neron his soul in exchange for power. Neron however, needs Kryppen to carry out a few tasks first.
*Source: dc.wikia.com