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Defilers! I'll...cut you into nothing! I'll feast on your brains! I'll swim in lakes of your own blood!
~ Matthias Pavayne
Matthias Pavayne was the chief antagonist of the Angel episode "Hell Bound." He was the tormented soul of an insane serial-killer and dark magician who had been killed by Wolfram & Hart years previous to the episode and sought a long-lasting and violent vengeance against them for his death.
Matthias Pavayne was an 18th century European aristocrat. He was a doctor that was nicknamed the Reaper for performing unnecessary surgeries on his patients. When Pavayne's ghost haunted the Los Angeles branch of Wolfram & Hart, he had sacrificed them through a portal to Hell that he opened, in order to circumvent having to go himself.
Matthias turned his attention towards sending Spike, just as he was about to send Spike to Hell before Spike sacrificed his chance to become corporeal again by throwing Pavayne into the machine. Angel defeated him and then arranged for him to be kept in a special Wolfram & Hart containment unit with his only reprive from the torment being a window of the corridor outside his cell.
Due to the destruction of the L.A. Wolfram & Hart building after the events of "Not Fade Away", it seems likely that Pavayne died during the collapse.