Arty339
This story features Jack Kline from Supernatural and he is a Nephilim however this story doesn't have Dean or Sam, just Jack. In this his father, Lucifer, is trying to get him to kill people for 'training' and also because Jack is good, Lucifer is trying to get him to use his powers for evil. Jack is under his fathers manipulation then he comes across Brooke who is an ordinary girl with knowledge of the supernatural. Brooke and her family is a target that Jack is sent to kill. Jack has full use of his powers but not full control. He has only been alive for 1 year and Lucifer is just about to turn him dark side.
I might turn this into a longer story depending on if I can think of something to continue it.
I literally saw this whole thing in a dream so I made a few alterations and made this... Hope you like it.