After 300 years of being in Heaven as human you turn. The Heavens were partaking in the HolyWar but was losing bad; many casualties on both sides.The demons took your injuries to advantage and tormented you mentally+physically.You snap, using your rage against you they successfully turned you into a demon, a powerful one too.Malachi didn’t believe it at first but once he found it he felt Guilty and Blamed himself;the entire time you were a demon he looked for ways to make you who you once were.