- Main article: The Nightmare
He was captured during a raid of the warehouse that served as the headquarters of his cult. He attempts to summon a demon which is killed by Michael Carpenter. He later committed suicide in his jail cell before his trial and returned as the Nightmare.
In the seriesEdit
- Main article: Grave Peril
In Grave Peril, Susan Rodriguez asks Dresden if he recalls the name of the guy that he and SI took down a couple of months earlier—the ritual killer. He reaches for the name saying Leo something, Cravat, Kraven the Hunter or something. Harry had tracked him down through the demon he called up. Harry never really heard the name. Susan then asks if it was Kravos, Leonid Kravos, and Harry agrees that was it. He is described as having brown hair going grey and an untrimmed beard.
Later, Harry has a dream that recalls how he, Michael Carpenter and the Special Investigations took him down during a raid of the warehouse. Then the dream changes to an entirely different horrifying outcome in which the team is overtaken by the demon—Azorthragal—that Kravos summoned up and takes a huge bite out of Harry.
Michael brought Lydia to Harry's apartment; he recognized her from Kravos's lair. When Lydia wakes up, she is possessed by the Nightmare. Michael can not slay it with Amoracchius because its inside Lydia—an innocent—not a construct and shedding innocent blood would undo the Sword. Just as Harry is about to die, he finally realizes that Lydia is possessed by Kravos's ghost not his demon and knows how to destroy it. Thomas Raith distracts Lydia by using his White Court powers. This frees Harry to exorcise Kravos's ghost from Lydia.
Later, locked in a room at Bianca St. Claire's mansion, Kravos inhabits Justine and taunts Harry. shortly after, Harry sets a trap for him, goes to sleep, Kravos enters his mind, Harry dies, creates a ghost and destroys Kravos, eating back his powers and some of Kravos as well. Susan had been keeping his body going with CPR. After that, Harry was strong enough to escape their prison taking Susan and Justine with him. 
- Main article: Summer Knight (novel)
In Summer Knight, Murphy is having continual bad dreams—night terrors—about what Kravos did to her. What scares her is that there wasn't anything she could do to stop his invasion of her mind.
- Main article: Ghost Story
In Ghost Story, Harry warns Murphy that with Mortimer Lindquist having been abducted by the Grey Ghost, he's not around to keep the Lecter Specters—serial killer ghosts—calm and happy which means they'll revert to being killers able to manifest. They could end up with many serial-killer ghosts like the Nightmare rampaging around Chicago killing. They need to rescue Morty. Harry considers that if Kravos had access to his magic as a Ghost that it stands to reason that he should as well.
- Main article: Cold Days