who is sebastian in the mortal instruments series
List of The Mortal Instruments characters Sebastian Verlac/Jonathan Christopher Morgenstern/Sebastian Morgenstern is the true blood related son of Valentine Morgenstern and Jocelyn Fairchild, making him the brother of Clary Fray. His real name is Jonathan Christopher Morgenstern, but he went by Sebastian Verlac (cousin of the Penhallows) in City of Glass. He is very sadistic in nature, as a result of having been experimented on by his father with the blood of the Greater Demon Lilith, which robbed him of his humanity. He first appears in City of Glass as Sebastian Verlac, charming his way into the lives of the Lightwoods. He takes Clary to see Ragnor Fell, and kisses her, disgusting her. Upon Clary's return with Jace to Alicante, it is discovered that Max Lightwood had seen someone climbing the demon warding towers. Sebastian was the person climbing the towers, and it was his blood that was used to bring down the wards. During the first attack on Alicante, he also kills Max Lightwood and severely injures Isabelle Lightwood. He is eventually tracked down and killed by Jace, before the summoning of Raziel by Valentine, but his body is never recovered. He is taken by his "mother", Lilith, and taken to safety. She uses Jace as leverage and tries to bring him back from the dead. In City of Fallen Angels he is awoken, and uses a rune put on Jace to control him.