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Jack is the [[Nephilim]] son of [[Kelly Kline]] and [[Lucifer]]. He was conceived when Lucifer inhabited the body of [[President Jefferson Rooney]], with
who Kelly was having a relationship. Angel lore says that the Nephilim will be an force of great evil, however after the nephilim while in uterero gives Castiel a glimpse of the future, Cas believes will bring peace and paradise to Earth.